CN115353101B - Modified graphene oxide film with high sensitivity and high thermal stability - Google Patents
Modified graphene oxide film with high sensitivity and high thermal stability Download PDFInfo
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical class [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 230000035945 sensitivity Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000002360 preparation method Methods 0.000 claims abstract description 17
- 239000006185 dispersion Substances 0.000 claims description 46
- 239000007788 liquid Substances 0.000 claims description 34
- 238000001035 drying Methods 0.000 claims description 31
- 235000015197 apple juice Nutrition 0.000 claims description 28
- 238000009210 therapy by ultrasound Methods 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 235000015206 pear juice Nutrition 0.000 claims description 15
- 229910002804 graphite Inorganic materials 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 13
- 239000007787 solid Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
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- 230000002194 synthesizing effect Effects 0.000 claims description 11
- 235000011389 fruit/vegetable juice Nutrition 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 8
- 235000013997 pineapple juice Nutrition 0.000 claims description 7
- 235000012828 Citrullus lanatus var citroides Nutrition 0.000 claims description 4
- 235000005979 Citrus limon Nutrition 0.000 claims description 4
- 244000131522 Citrus pyriformis Species 0.000 claims description 4
- 244000241235 Citrullus lanatus Species 0.000 claims 1
- 229910021389 graphene Inorganic materials 0.000 abstract description 22
- 238000000802 evaporation-induced self-assembly Methods 0.000 abstract description 10
- 230000004044 response Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 13
- 238000012360 testing method Methods 0.000 description 13
- 238000004458 analytical method Methods 0.000 description 5
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- 238000000527 sonication Methods 0.000 description 5
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- 239000000523 sample Substances 0.000 description 4
- 241000219109 Citrullus Species 0.000 description 3
- 238000001157 Fourier transform infrared spectrum Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000001878 scanning electron micrograph Methods 0.000 description 3
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003607 modifier Substances 0.000 description 2
- 150000008300 phosphoramidites Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 2
- 206010000369 Accident Diseases 0.000 description 1
- 229910014033 C-OH Inorganic materials 0.000 description 1
- 229910014570 C—OH Inorganic materials 0.000 description 1
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 description 1
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 description 1
- 238000003917 TEM image Methods 0.000 description 1
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
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- 238000012512 characterization method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229940068041 phytic acid Drugs 0.000 description 1
- 235000002949 phytic acid Nutrition 0.000 description 1
- 239000000467 phytic acid Substances 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000012286 potassium permanganate Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/198—Graphene oxide
Abstract
The invention discloses a modified graphene oxide film with high sensitivity and high thermal stability. The modified graphene oxide film is prepared by introducing organic molecules between graphene oxide sheets by adopting an evaporation-induced self-assembly method, and has high sensitivity and high thermal stability. The fire alarm assembled by the modified graphene oxide film has high sensitivity, quick fire response effect, high thermal stability, and high sensitivity of 1.5+/-0.5 s when the fire occurs at 150 ℃, can continuously alarm after the fire occurs, and has the duration of at least 100 min, and the longest alarm time reported at home and abroad at present is about 7 min. The preparation process of the modified graphene oxide film is simple, low in cost, high in efficiency, easy to popularize and suitable for large-scale production.
Description
Technical Field
The invention belongs to the technical field of graphene films, and particularly relates to a modified graphene oxide film with high sensitivity and high thermal stability.
Background
In order to avoid fire accidents, two main aspects can be started, namely: the flame retardance of the building material is enhanced, and the performance of an alarm system is optimized; both are key factors affecting the spread of fire and the early escape of resident. In terms of alarm systems, fire alarms have become a popular research in recent years, wherein some progress has been made in the preparation of modified graphene oxide-based materials. Researchers report that modified graphene films are prepared by modifying graphene oxide with different modifiers (phytic acid, boric acid, cellulose, polydopamine and the like) by an evaporation-induced self-assembly method, a dipping method and the like; the prepared film is connected with a battery and an alarm lamp through a lead, and is assembled into a fire alarm for fire alarm test. The result shows that the sensitivity of the fire alarm assembled on the basis of the modified graphene film is gradually improved, but the thermal stability of the fire alarm is still obviously insufficient (the longest alarm time is about 7 min). Therefore, on the premise of ensuring the sensitivity of the graphene oxide-based fire alarm, improving the thermal stability of the graphene oxide-based fire alarm is a problem to be solved urgently.
The prior patents (CN 109920600A) and (CN 112457824B) which use graphene as a fire alarm material are obtained through patent retrieval. The prior patent (CN 109920600A) is a nonmetallic thermosensitive probe alarming precursor consisting of an upper graphene conductive film layer, a lower graphene conductive film layer and a nonmetallic optical fiber thermosensitive sensor, and is characterized in that alarming is carried out in time when the temperature is higher than 70 ℃, but the thermal stability is not studied. The prior patent (CN 112457824B) is to react the phosphoramidite with the graphene oxide to obtain a flexible film of the phosphoramidite/the graphene oxide as an alarm material, and only the heat conductivity coefficient (namely the response sensitivity after encountering fire) of the flexible film in the plane direction is researched, but the heat stability is not researched. In summary, the above two patents do not study the thermal stability of the alarm material, and cannot obtain the characteristics of whether the alarm material can continuously alarm and the duration of alarm at high temperature.
Disclosure of Invention
In order to overcome the defect of the thermal stability of the conventional modified graphene oxide film, the invention aims to provide the modified graphene oxide film with high sensitivity and high thermal stability.
The technical scheme of the invention is as follows:
the modified graphene oxide film is prepared by introducing organic molecules between graphene oxide sheets by adopting an evaporation-induced self-assembly method.
The preparation method of the modified graphene oxide film with high sensitivity and high thermal stability comprises the following steps:
(1) Synthesizing pure solid graphite oxide GO by adopting an improved Hummers method for later use;
(2) Physically crushing to obtain organic molecular solution with floccules for later use;
(3) Adding solid graphite oxide GO into water, and performing ultrasonic treatment through a cell pulverizer to obtain GO dispersion liquid for later use;
(4) Mixing GO dispersion liquid with organic molecule solution, and continuously stirring under ultrasonic treatment to obtain mixed dispersion liquid for later use;
(5) And pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying in a drying oven to obtain the modified graphene oxide film.
Specifically, in the step (2), the organic molecule solution is juice.
More specifically, in the step (2), the juice is one of apple juice, lemon juice, pear juice, watermelon juice and pineapple juice.
Specifically, in the step (3), the concentration of the GO dispersion liquid is 2-10 mg mL -1 。
Specifically, in the step (4), the volume ratio of the GO dispersion liquid to the organic molecule solution is 1-10:1.
Specifically, in the step (4), the continuous stirring time is 30-120 min.
Specifically, in the step (5), the drying temperature in the drying oven is 40-80 ℃.
Specifically, in the step (5), the drying time in the drying oven is 48-120 h.
The application of the modified graphene oxide film with high sensitivity and high thermal stability is that the modified graphene oxide film is applied to the field of fire alarms.
Effects of the invention
The invention provides a modified graphene oxide film with high sensitivity and high thermal stability. The modified graphene oxide film is obtained by introducing organic molecules (such as apple juice, lemon juice, pear juice, watermelon juice or pineapple juice and other organic substance solutions) between graphene oxide sheets by an evaporation induced self-assembly method, and is high in sensitivity and high in thermal stability.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the organic molecules are introduced between graphene oxide sheets by an evaporation induced self-assembly method, so that a modified graphene oxide film is formed, and compared with the traditional alarm material, the modified graphene oxide film has more excellent sensitivity and thermal stability. The traditional alarm material also uses graphene as the alarm material, but does not introduce organic molecular solution, so that the thermal stability is poor, and the longest alarm time after a fire alarm occurs is about 7 min. The fire alarm assembled by the modified graphene oxide film can continuously alarm after a fire disaster occurs, the continuous alarm time is at least 100 min, and the fire alarm has excellent thermal stability.
2. The fire alarm assembled by the modified graphene oxide film has high sensitivity and rapid fire response effect, and when the fire occurs to 150 ℃, the sensitivity of the fire alarm is 1.5+/-0.5 s. The preparation process of the modified graphene oxide film is simple, low in cost, high in efficiency, easy to popularize and suitable for large-scale production. The novel method provides a novel thought for comprehensive utilization of organic matters, realizes a novel process route for preparing the modified graphene oxide in China, and has strong innovation. Organic molecules are successfully introduced between graphene oxide sheets by a simple and easy-to-operate evaporation-induced self-assembly method, so that the modified graphene oxide film with high sensitivity and high thermal stability is prepared, and the film has good flexibility. The film is linked with a battery and an alarm lamp through a lead to assemble the fire alarm. When the insulated modified graphene oxide film encounters a flame, the film is quickly reduced to a graphene film with conductivity (the sensitivity=1.5+/-0.5 s, the high sensitivity is shown), so that a closed loop is formed to light an alarm lamp; due to the modification of organic molecules, the thermal stability of the film is improved, and an ultra-long and continuous alarm signal is displayed (the alarm time is more than or equal to 100 min).
Drawings
FIG. 1a is an XPS test chart of an apple juice modified graphene oxide film GO-AJ prepared in the embodiment 1 of the invention;
FIG. 1b is a FRIT test chart of an apple juice modified graphene oxide film GO-AJ prepared in example 1 of the present invention;
FIG. 2a TEM image of GO surface;
FIG. 2b SEM of GO-AJ surface;
FIG. 2c is an SEM image of a partial GO-AJ surface;
FIG. 2d cross-sectional SEM of GO;
FIG. 2e a cross-sectional SEM of GO-AJ;
FIG. 2f EDS diagram of GO-AJ;
FIG. 2g elemental C analysis chart;
FIG. 2h elemental O analysis test chart;
FIG. 2i is an elemental Fe analysis chart;
FIG. 2j element K analysis test chart;
fig. 2k elemental Ca analysis test chart;
fig. 3 shows a flexibility test chart (a is three folds, b is a plurality of folds, and c is a folded airplane) of an apple juice modified graphene oxide film GO-AJ prepared by the embodiment of the invention.
Detailed Description
Example 1:
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid Graphite Oxide (GO) by adopting an improved Hummers method for standby;
(2) Physically pulverizing to obtain Apple Juice (AJ) with floccules for use;
(3) Adding the prepared GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain 4 mg mL -1 GO dispersion of (2) for use;
(4) Mixing the GO dispersion liquid with AJ, wherein the volume ratio of the GO dispersion liquid to the AJ is 6:1, and continuously stirring for 60 min under ultrasonic treatment;
(5) Pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying 120 h in a 70 ℃ drying box to obtain the GO-AJ film.
Example 2:
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid Graphite Oxide (GO) by adopting an improved Hummers method for standby;
(2) Physically pulverizing to obtain Apple Juice (AJ) with floccules for use;
(3) Adding the prepared GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain 2 mg mL -1 GO dispersion of (2) for use;
(4) And mixing the GO dispersion liquid with AJ, wherein the volume ratio of the GO dispersion liquid to the AJ is 3:1. Stirring continuously for 30 min under ultrasonic treatment;
(5) Pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying 72-h in a 50 ℃ drying box to obtain the GO-AJ film.
Example 3:
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid Graphite Oxide (GO) by adopting an improved Hummers method for standby;
(2) Physically pulverizing to obtain Apple Juice (AJ) with floccules for use;
(3) Adding the prepared GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain 3 mg mL -1 GO dispersion of (2)Liquid for standby;
(4) And mixing the GO dispersion liquid with AJ, wherein the volume ratio of the GO dispersion liquid to the AJ is 2:1. Continuously stirring for 120 min under ultrasonic treatment;
(5) Pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying 48 and h in a drying box at 40 ℃ to obtain the GO-AJ film.
Example 4:
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid Graphite Oxide (GO) by adopting an improved Hummers method for standby;
(2) Physically pulverizing to obtain Lemon Juice (LJ) with floccules for use;
(3) Adding the prepared GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain 2 mg mL -1 GO dispersion of (2) for use;
(4) The GO dispersion was mixed with LJ at a volume ratio of GO to LJ of 3:1. Stirring continuously for 30 min under ultrasonic treatment;
(5) Pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying 72-h in a 50 ℃ drying box to obtain the GO-LJ film.
Example 5:
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid Graphite Oxide (GO) by adopting an improved Hummers method for standby;
(2) Physically crushing to obtain Pear Juice (PJ) with floccules for later use;
(3) Adding the prepared GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain 2 mg mL -1 GO dispersion of (2) for use;
(4) And mixing the GO dispersion liquid with the PJ, wherein the volume ratio of the GO dispersion liquid to the PJ is 3:1. Stirring was continued for 30 min under sonication.
(5) Pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying 72-h in a drying oven at 80 ℃ to obtain the GO-PJ film.
Example 6:
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid Graphite Oxide (GO) by adopting an improved Hummers method for standby;
(2) Physically crushing to obtain Pear Juice (PJ) with floccules for later use;
(3) Adding the prepared GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain 10 mg mL -1 GO dispersion of (2) for use;
(4) And mixing the GO dispersion liquid with the PJ, wherein the volume ratio of the GO dispersion liquid to the PJ is 10:1. Stirring was continued for 90 min under sonication.
(5) Pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying in a 50 ℃ drying box for 96 h to obtain the GO-PJ film.
Example 7:
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid Graphite Oxide (GO) by adopting an improved Hummers method for standby;
(2) Physically crushing to obtain Pear Juice (PJ) with floccules for later use;
(3) Adding the prepared GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain 1mg mL -1 GO dispersion of (2) for use;
(4) And mixing the GO dispersion liquid with the PJ, wherein the volume ratio of the GO dispersion liquid to the PJ is 1:1. Stirring was continued for 60 min under sonication.
(5) Pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying 48 and h in a drying box at 40 ℃ to obtain the GO-PJ film.
Example 8:
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid Graphite Oxide (GO) by adopting an improved Hummers method for standby;
(2) Physically crushing to obtain Watermelon Juice (WJ) with floccules for later use;
(3) Adding the prepared GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain 1mg mL -1 GO dispersion of (2) for use;
(4) The GO dispersion was mixed with WJ in a 3:1 ratio by volume. Stirring was continued for 60 min under sonication.
(5) Pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying 72-h in a drying oven at 60 ℃ to obtain the GO-WJ film.
Example 9:
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid Graphite Oxide (GO) by adopting an improved Hummers method for standby;
(2) Physically pulverizing to obtain pineapple juice (PIJ) with floccules for use;
(3) Adding the prepared GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain 1mg mL -1 GO dispersion of (2) for use;
(4) The GO dispersion was mixed with PIJ in a volume ratio of GO dispersion to PIJ of 3:1. Stirring was continued for 60 min under sonication.
(5) Pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying 72-h in a drying oven at 60 ℃ to obtain the GO-PIJ film.
The inventors have carried out the following experiments for verifying the effect of the present invention:
experimental example:
1. control extract preparation method
1.1 Test material and reagent instrument
1.1.1 Test materials and reagents
Graphite powder (particle size 30 μm, 99.9%) was purchased from Shanghai Ala Biochemical technologies Co., ltd. The organic material used in this work was purchased from the flower stream area Jinhan fruit store. Potassium persulfate (K) 2 S 2 O 8 ) Phosphorus pentoxide (P) 2 O 5 ) And potassium permanganate (KMnO) 4 ) Purchased from sigma aldrich (Shanghai) trade limited. Sulfuric acid (H) produced by Zhuhua Chengda chemical Co., ltd 2 SO 4 98 wt%) and hydrochloric acid (HCl, 37 wt%). Hydrogen peroxide (H) 2 O 2 30, wt%) were purchasedIn China, chemical reagents, inc. All reagents were used directly without further purification.
1.1.2 test instruments
Cell disruptor (KQ-5200) Ningbo Xinzhi biotechnology Co., ltd; electrothermal blowing drying oven (101-3 AB) Tianjin Tiantai instruments Co., ltd; electronic analytical balance (AL 204) mertrel-tolido instruments (Shanghai); desk vacuum freeze dryer (FD-1A-80) Jiangsu Tian Feng instrument Co., ltd; scanning electron microscope (SEM, S4800) japan hitachi company; infrared spectrometer (FTIR, avatar 360) Thermo Nicolet company of america; x-ray photoelectron spectrometer (XPS, PHI-1600) Perkin-Elmer, inc. of America.
1.2 Test method
1.2.1 XPS and FTIR spectroscopic experiments
XPS and FTIR spectra are effective means for analyzing chemical composition of samples, and the following apple juice modified graphene oxide film (GO-AJ) prepared by using pure graphene oxide film (GO) and Apple Juice (AJ) as modifiers is used as a characterization sample, and the preparation method is carried out according to example 1.
(1) FIG. 1a is an XPS plot of a sample with GO having C1 s, O1 s as the major peaks; the main peaks of GO-AJ are C1 s, O1 s, P2 s and P2P, which indicate that the GO-AJ consists of C, O and P elements, and the fact that the AJ molecules are successfully inserted into the GO sheets in the self-assembly process induced by water evaporation is confirmed. FIG. 1b is a FTIR spectrum of a sample at 3420, 1738 and 1624, 1624 cm -1 Characteristic peaks are shown at O-H, C =O and the stretching vibration of adsorbed water molecules, respectively, and the stretching vibration peak of C-OH is at 1053 cm -1 Where it is located. FTIR spectra of GO-AJ retained the characteristic signature of GO oxygen-containing function, but at 1155 and 956 cm -1 Two new peaks appear at this point, the tensile vibration peaks for p=o and P-OH, respectively. O-H from 3420 cm -1 Migration to 3410 cm -1 As a result of hydrogen bonding interactions between GO and AJ. This demonstrates that AJ molecules have been successfully inserted into GO sheets during water evaporation induced self-assembly, corresponding to XPS results.
(2) The microscopic morphology of the film was observed by SEM images. It can be seen that the appearance of GO shows a flat surface with no significant wrinkles (fig. 2 a). SEM images of the GO-AJ surface showed that the surface was wrinkled (fig. 2 b). Fig. 2c is a partial enlarged view of the GO-AJ surface, from which a typical graphene layered structure can be observed from the SEM cross-sectional view of the GO film in fig. 2 d. As shown in fig. 2e, SEM cross-sectional view of GO-AJ shows a denser layered structure, and it can be seen that AJ molecules have been successfully inserted into GO sheets during water evaporation induced self-assembly. Furthermore, the elemental distribution also demonstrates that AJ molecules have been successfully inserted into GO sheets during water evaporation induced self-assembly; wherein C, O, fe and K are distributed mainly around (FIG. 2 g-j), while Ca is distributed in the middle (FIG. 2K).
(3) And (3) introducing organic molecules between graphene oxide sheets by adopting an evaporation-induced self-assembly method to prepare a modified graphene oxide film with high sensitivity and high thermal stability, and performing a flexibility test, wherein the test result is shown in figure 3. As can be seen in FIG. 3, GO-AJ can be folded multiple times (e.g., a-b in FIG. 3) and can also be folded into a desired shape (e.g., c in FIG. 3: folded into an aircraft). The film has better flexibility than the similar products.
1.2.2 Sensitivity and thermal stability test
The apple juice modified graphene oxide film with high sensitivity and high thermal stability prepared in the embodiment 1 is subjected to sensitivity and thermal stability (namely response time) test, and graphene-based materials (controls 1-11) disclosed in the prior art are used as controls, wherein the graphene-based materials and the preparation method thereof disclosed in the prior art are specifically provided in references in table 1.
As can be seen from Table 2, the thermal stability of the modified graphene oxide film with high sensitivity and high thermal stability prepared by the method is obviously higher than that of the graphene-based material reported at present on the premise of not influencing the high sensitivity.
Table 1 control group and corresponding references
TABLE 2 sensitivity and thermal stability comparison
Summary
The modified graphene oxide film with high sensitivity and high thermal stability is prepared; taking an apple juice modified graphene oxide film as an example, the fire alarm assembled based on the modified graphene oxide film has the advantages of rapid fire response (sensitivity=1.5+/-0.5 s) and good thermal stability (alarm time is at least 100 min), and the alarm time is obviously higher than the longest alarm time reported at home and abroad at present (the duration of a comparison 8 in a comparison group is 433.0 s longest).
Claims (3)
1. The application of the modified graphene oxide film with high sensitivity and high thermal stability is characterized in that: the modified graphene oxide film is applied to the field of fire alarms;
the preparation method of the modified graphene oxide film comprises the following steps:
(1) Synthesizing pure solid graphite oxide GO by adopting an improved Hummers method for later use;
(2) Physically crushing to obtain an organic molecule solution with floccules, wherein the organic molecule solution is one of apple juice, lemon juice, pear juice, watermelon juice or pineapple juice; standby;
(3) Adding solid graphite oxide GO into water, and performing ultrasonic treatment by using a cell pulverizer to obtain GO dispersion liquid, wherein the concentration of the GO dispersion liquid is 2-10 mg mL -1 Standby;
(4) Mixing GO dispersion liquid and organic molecule solution, wherein the volume ratio of GO dispersion liquid to organic molecule solution is 1-10:1, and continuously stirring for 30-120 min under ultrasonic treatment to obtain mixed dispersion liquid for later use;
(5) And pouring the mixed dispersion liquid after ultrasonic treatment into a polytetrafluoroethylene culture dish, and drying in a drying oven to obtain the modified graphene oxide film.
2. The use of a modified graphene oxide film with high sensitivity and high thermal stability according to claim 1, characterized in that: in the step (5), the drying temperature in the drying oven is 40-80 ℃.
3. The use of a modified graphene oxide film with high sensitivity and high thermal stability according to claim 1, characterized in that: in the step (5), the drying time in the drying oven is 48-120 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211021055.1A CN115353101B (en) | 2022-08-24 | 2022-08-24 | Modified graphene oxide film with high sensitivity and high thermal stability |
Applications Claiming Priority (1)
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| CN109021983A (en) * | 2018-07-13 | 2018-12-18 | 杭州师范大学 | A kind of preparation method and its fire alarm application of modified graphene oxide fire-retardant film |
| CN110540198A (en) * | 2019-09-25 | 2019-12-06 | 广东工业大学 | Graphene oxide-based self-repairing flame-retardant composite film, preparation thereof and fire alarm |
| CN111019187A (en) * | 2020-01-02 | 2020-04-17 | 华南理工大学 | Flame-retardant aerogel with fire early warning and piezoresistive sensing functions and preparation method thereof |
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| US10501324B2 (en) * | 2017-12-31 | 2019-12-10 | Hk Invent Corporation | Systems, devices, and/or methods for reactive graphene and its applications |
| JP6935442B2 (en) * | 2019-03-18 | 2021-09-15 | 株式会社東芝 | Fire alarm system |
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| CN109021983A (en) * | 2018-07-13 | 2018-12-18 | 杭州师范大学 | A kind of preparation method and its fire alarm application of modified graphene oxide fire-retardant film |
| CN110540198A (en) * | 2019-09-25 | 2019-12-06 | 广东工业大学 | Graphene oxide-based self-repairing flame-retardant composite film, preparation thereof and fire alarm |
| CN111019187A (en) * | 2020-01-02 | 2020-04-17 | 华南理工大学 | Flame-retardant aerogel with fire early warning and piezoresistive sensing functions and preparation method thereof |
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| Nacre-biomimetic graphene oxide paper intercalated by phytic acid and its ultrafast fire-alarm application;Chen, GQ et al.;《JOURNAL OF COLLOID AND INTERFACE SCIENCE》;第578卷;第412-421页 * |
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