CN114920298A - Crystalline two-dimensional porous CuO/WO 3 Nanosheet, preparation method thereof and application of nanosheet as acetoin sensor - Google Patents
Crystalline two-dimensional porous CuO/WO 3 Nanosheet, preparation method thereof and application of nanosheet as acetoin sensor Download PDFInfo
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Abstract
The invention discloses a crystalline two-dimensional porous CuO/WO 3 Nanosheet, preparation method thereof and application of nanosheet as acetoin sensor, wherein the nanosheet is synthesized by a space self-limiting domain assembly strategy, CuO exists in the form of nanoparticles and is uniformly dispersed in crystalline porous WO 3 And (3) the surface of the nanosheet. Dissolving inorganic salt, tungsten compound and copper compound in water, freezing the mixed solution at low temperature, obtaining a precursor under the condition of freeze drying, calcining the obtained sample at high temperature to crystallize the sample at high temperature, and washing the salt mold by deionized waterDrying the plate to obtain crystalline two-dimensional porous CuO/WO 3 Nanosheets. The invention is described in WO 3 The CuO nano-particles are compounded on the basis, so that the selectivity and stability of the catalyst to acetoin are improved, when the working temperature is 100 ℃, the catalyst has better selectivity to the acetoin, the sensitivity of the catalyst to 50ppm of the acetoin reaches 588.67, the response-recovery time is fast, the stability is high, and the moisture resistance is good.
Description
Technical Field
The invention relates to a crystalline two-dimensional porous CuO/WO 3 Preparation of a nano sheet and application of the nano sheet in an acetoin sensor.
Background
Listeria Monocytogenes (LMs) is an infectious food pathogen, and can cause various diseases including local enteritis and systemic infection of people with low and normal immunity, with a mortality rate of 20-30%. However, LMs are widely distributed in fruits, vegetables or other food products and exhibit high low temperature reproductive capacity, which makes it extremely difficult to prevent the spread of LMs. Therefore, the method has important significance for accurately and quantitatively detecting the LMs. Currently, various methods including nucleic acid detection, immunoassays and microbiological studies have been explored for the detection of LMs. Despite the significant advances made, these techniques still suffer from the complexity and cost of developing a cost effective and convenient method for monitoring pathogenic microorganisms in food products is highly desirable. In particular, Microbial Volatile Organic Compounds (MVOCs) are metabolized by microorganismsImportant components of the substance. Acetoin (3-hydroxy-2-butanone) is reported to be the major exhaled gas (32.2% abundance) in the volatile metabolites of LMs, the concentrations of which correlate with LMs growth. Acetoin may therefore be considered as a biomarker for the detection of LMs. The literature reports that ordered cobalt-doped zinc oxide ultrafine particles (sensor. actual. B-chem., 358, 2022, 131482) are constructed by using MOF as a template, and the prepared sensor has a high optimal temperature response to acetoin and a poor long-term stability effect. Literature reports that a hydrothermal method is adopted to synthesize three-dimensional sea urchin-shaped WO 3 (Mat. Sci. Semicon. Proc., 137, 2022, 106120), three-dimensional Hemicentrotus Seu Strongylocentrotus WO 3 The sensor has a mesoporous structure formed by interconnected nano rods, which is beneficial to the diffusion of gas molecules, and has the advantages of quick response-recovery time to acetoin, low detection limit, higher operating temperature and low sensitivity. The existing acetoin sensor still has the defects of complex preparation method, high operation temperature, poor stability, low sensitivity and the like. Therefore, there is a need to develop an acetoin gas sensor that has a low operating temperature, high sensitivity, low cost, and is stable.
Disclosure of Invention
The invention aims to solve the technical problems that an acetoin sensor has the defects of low sensitivity, high working temperature, poor stability and the like, and provides crystalline two-dimensional porous CuO/WO with high sensitivity, low power consumption and excellent selectivity for acetoin gas 3 Nanosheet and preparation method and application thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
crystalline two-dimensional porous CuO/WO of the invention 3 The nano-sheets are synthesized by a space self-limited domain assembly strategy, and CuO nano-particles are uniformly distributed in crystalline two-dimensional porous WO 3 The surface of the nano-sheet.
Crystalline two-dimensional porous CuO/WO of the invention 3 The preparation method of the nano sheet comprises the following steps: firstly, dissolving inorganic salt, tungsten compound and copper compound in water, ultrasonically dissolving, prefreezing the mixed solution under the condition of low temperature, then obtaining a precursor under the condition of freeze drying, and calcining the obtained sample under the condition of high temperatureHigh-temperature crystallization is carried out by burning, deionized water is used for washing out salt template, and two-dimensional porous CuO/WO is obtained after oven drying 3 A nanosheet.
The invention discloses crystalline two-dimensional porous CuO/WO 3 The preparation method of the nanosheet comprises the following specific steps:
crystalline two-dimensional porous CuO/WO 3 Nanosheets, the crystalline two-dimensional porous CuO/WO 3 The nano-sheets are synthesized by a space self-limiting domain assembly strategy, and CuO nano-particles are uniformly distributed in crystalline two-dimensional porous WO 3 And (3) the surface of the nanosheet.
The invention relates to crystalline two-dimensional porous CuO/WO 3 A method of making nanoplatelets comprising the steps of:
(1) preparing an inorganic salt solution: dissolving inorganic salt in water, and stirring until the solution is transparent and clear to obtain an inorganic salt solution;
(2) preparation of CuO/WO 3 Precursor: dissolving a copper compound and a tungsten compound in an inorganic salt solution, ultrasonically stirring until the copper compound and the tungsten compound are completely dispersed to obtain a mixed solution, pre-freezing the mixed solution at a low temperature, and then putting the pre-frozen mixed solution into a freeze dryer for freeze drying to obtain CuO/WO 3 A precursor;
(3) preparation of crystalline two-dimensional porous CuO/WO 3 Nanosheet: leading the CuO/WO prepared in the step (2) to be 3 Calcining the precursor in a muffle furnace to crystallize the precursor at high temperature, then using deionized water to fully wash off the inorganic salt template, and drying at 60 ℃ to obtain the crystallized two-dimensional porous CuO/WO 3 Nanosheets.
Further, the inorganic salt in the step (1) is one or more of sodium chloride, potassium sulfate, potassium chloride, ammonium nitrate, potassium bromide, sodium sulfate or sodium nitrate, and the concentration of the inorganic salt solution is 0.05 g/mL-2 g/mL.
Further, the copper compound in the step (2) is CuCl 2 、CuSO 4 、CuSO 4 ·5H 2 O or Cu (NO) 3 ) 2 One or more of the above; the tungsten compound being Na 2 WO 4 ·2H 2 O、K 2 WO 4 、(NH 4 ) 6 H 2 W 12 O 40 ·XH 2 O、H 4 [Si(W 3 O 10 ) 4 ]·xH 2 O、WCl 6 One or more of (a).
Further, the mass ratio of the tungsten compound to the copper compound in the step (2) is 1: 0.005-1: 0.05; the total concentration of the tungsten compound and the copper compound in the mixed solution is 0.01 g/mL-0.42 g/mL.
Further, the mass ratio of the inorganic salt to the tungsten compound in the step (2) is 1: 0.01-1: 0.5.
Further, in the step (2), the pre-freezing temperature is-18 ℃ to 28 ℃, the pre-freezing time is 12 hours to 24 hours, the freeze-drying temperature is-50 ℃ to-65 ℃, and the freeze-drying time is 24 hours to 48 hours.
Further, the calcination temperature in the step (3) is 400-800 ℃, the temperature rise rate is 2-5 ℃ per minute, and the calcination time is 1-2 h.
Further, in the step (3), the drying temperature is 60 ℃, and the drying time is 4-6 h.
The key point of the innovation of the invention is to prepare crystalline two-dimensional porous CuO/WO 3 Nanosheets. Many materials for the acetoin sensor are prepared, but the preparation method is complicated, the operation temperature is high, the stability is poor and the sensitivity is low. The invention relates to crystalline two-dimensional porous CuO/WO 3 Application of nanosheet as gas-sensitive element in high-sensitivity acetoin sensor, wherein when the working temperature is 100 ℃, the crystalline two-dimensional porous CuO/WO 3 The nanosheet as a gas sensor has good selectivity to acetoin and the sensitivity to 50ppm of acetoin reaches 588.67.
The invention has the beneficial effects that: the invention is described in WO 3 CuO nano particles are compounded on the basis of the nano sheets, so that the sensitivity and selectivity to acetoin gas are improved, and the stability is good; the sensitivity of 100 ℃ working temperature to 50ppm acetoin gas is 588.67 high, and the working temperature is reduced compared with that of the existing acetoin sensor. The method has the advantages of innovative synthesis, high yield and low preparation cost; the shape and size of the material are uniform; the response to acetoin gas is high, and industrialization is easy to realize.
Drawings
FIG. 1 shows crystal II prepared in example 8Porous CuO/WO 3 XRD pattern of nanoplatelets.
FIG. 2 is a crystalline two-dimensional porous CuO/WO prepared in example 8 3 Scanning Electron Microscopy (SEM) images of the nanoplatelets.
FIG. 3 is a crystalline two-dimensional porous CuO/WO prepared in example 8 3 Transmission Electron Microscopy (TEM) images of the nanoplatelets.
FIG. 4 is a crystalline two-dimensional porous CuO/WO prepared in example 8 3 Response of the nanosheets to 50ppm acetoin at 60-160 ℃.
FIG. 5 is a crystalline two-dimensional porous CuO/WO prepared in example 8 3 Long-term stability of the nanosheets to 50ppm acetoin over 30 days.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the following examples are illustrative only and are not intended to limit the scope of the invention, which is to be given the full breadth of the appended claims and any and all insubstantial modifications and variations thereof which can be made by one skilled in the art based on the teachings of the invention as described above.
Example 1
The crystalline two-dimensional porous CuO/WO of the present example 3 The preparation method of the nano sheet comprises the following steps:
(1) weighing 1g of potassium chloride, adding 10ml of water, and ultrasonically stirring for dissolving for 5min to form a uniform and stable transparent clear solution;
(2) to the salt solution of (1) was slowly added 200mg of Na 2 WO 4 ·2H 2 O and 2mg of CuCl 2 Pre-freezing for 6h at the low temperature of-18 ℃ after ultrasonic stirring and dissolving for 10min, and freeze-drying for 24h at the temperature of-50 ℃ in a freeze dryer after pre-freezing to obtain CuO/WO 3 A precursor;
(3) mixing CuO/WO 3 And (3) putting the precursor into a muffle furnace, heating to 400 ℃ at a heating rate of 2 ℃/min, and keeping the temperature for 2 hours. Washing the obtained product with distilled water for 3 times, washing the product with absolute ethyl alcohol for 1 time, and drying the product in a 60 ℃ oven for 6 hours to obtain the crystalline two-dimensional porous CuO/WO 3 Nanosheets.
Example 2
Crystalline two-dimensional porous CuO/WO of the present example 3 The preparation method of the nano sheet comprises the following steps:
(1) weighing 1g of sodium chloride, adding 20ml of water, and ultrasonically stirring for dissolving for 10min to form a uniform and stable transparent clear solution;
(2) to the (1) salt solution, 400mg of Na was slowly added 2 WO 4 ·2H 2 O and 2mg of CuCl 2 Pre-freezing at-18 ℃ for 12h after ultrasonic stirring and dissolving for 20min, and freeze-drying at-54 ℃ for 32h in a freeze dryer after pre-freezing to obtain CuO/WO 3 A precursor;
(3) mixing CuO/WO 3 And putting the precursor into a muffle furnace, heating to 470 ℃ at a heating rate of 1.5 ℃/min, and keeping the temperature for 2 hours. Washing the obtained product with distilled water for 4 times, washing the product with absolute ethyl alcohol for 1 time, and drying the product in a 60 ℃ oven for 5 hours to obtain the crystalline two-dimensional porous CuO/WO 3 Nanosheets.
Example 3
The crystalline two-dimensional porous CuO/WO of the present example 3 The preparation method of the nano sheet comprises the following steps:
(1) weighing 2g of sodium sulfate, adding 10ml of water, and ultrasonically stirring for dissolving for 8min to form a uniform and stable transparent clear solution;
(2) to the salt solution of (1) was slowly added 500mg K 2 WO 4 And 25mg of CuSO 4 ·5H 2 O, pre-freezing for 24 hours at the low temperature of 18 ℃ below zero after ultrasonic stirring and dissolving for 15 minutes, and putting the mixture into a freeze dryer for freeze drying for 36 hours at the temperature of 60 ℃ below zero after pre-freezing to obtain CuO/WO 3 A precursor;
(3) mixing CuO/WO 3 And putting the precursor into a muffle furnace, heating to 450 ℃ at a heating rate of 5 ℃/min, and preserving heat for 1 h. Washing the obtained product with distilled water for 4 times, washing the product with absolute ethyl alcohol for 1 time, and drying the product in a 60 ℃ oven for 4 hours to obtain the crystalline two-dimensional porous CuO/WO 3 Nanosheets.
Example 4
The crystalline two-dimensional porous CuO/WO of the present example 3 The preparation method of the nano sheet comprises the following steps:
(1) weighing 500mg of potassium bromide and 500mg of ammonium nitrate, adding 10ml of water, and ultrasonically stirring and dissolving for 12min to form uniform and stable transparent clear solution;
(2) to the salt solution of (1) was slowly added 400mg (NH) 4 ) 6 H 2 W 12 O 40 ·XH 2 O and 20mg of CuCl 2 Pre-freezing at-18 ℃ for 16h after ultrasonic stirring and dissolving for 25min, and freeze-drying at-60 ℃ for 24h in a freeze drier after pre-freezing to obtain CuO/WO 3 A precursor;
(3) mixing CuO/WO 3 And putting the precursor into a muffle furnace, heating to 500 ℃ at a heating rate of 4 ℃/min, and preserving heat for 1.2 h. Washing the obtained product with distilled water for 3 times, washing the product with absolute ethyl alcohol for 1 time, and drying the product in a 60 ℃ oven for 4 hours to obtain the crystalline two-dimensional porous CuO/WO 3 Nanosheets.
Example 5
Crystalline two-dimensional porous CuO/WO of the present example 3 The preparation method of the nano sheet comprises the following steps:
(1) weighing 500mg of sodium sulfate and 500mg of potassium chloride, adding 12ml of water, and ultrasonically stirring and dissolving for 8min to form uniform and stable transparent clear solution;
(2) slowly adding 100mg K to the salt solution of (1) 2 WO 4 And 10mg Cu (NO) 3 ) 2 Pre-freezing at-18 ℃ for 18h after ultrasonic stirring and dissolving for 10min, and freeze-drying at-52 ℃ for 12h in a freeze dryer after pre-freezing to obtain CuO/WO 3 A precursor;
(3) mixing CuO/WO 3 And putting the precursor into a muffle furnace, heating to 400 ℃ at the heating rate of 2.5 ℃/min, and preserving heat for 2 h. Washing the obtained product with distilled water for 4 times, washing the product with absolute ethyl alcohol for 1 time, and drying the product in a 60 ℃ oven for 4 hours to obtain the crystalline two-dimensional porous CuO/WO 3 Nanosheets.
Example 6
The crystalline two-dimensional porous CuO/WO of the present example 3 The preparation method of the nano sheet comprises the following steps:
(1) weighing 2g of sodium sulfate, adding 15ml of water, and ultrasonically stirring and dissolving for 10min to form a uniform and stable transparent clear solution;
(2) to the salt solution of (1) was slowly added 150mg of H 4 [Si(W 3 O 10 ) 4 ]·xH 2 O and 15mg CuSO 4 ·5H 2 O, pre-freezing for 16h at the low temperature of 18 ℃ below zero after ultrasonic stirring and dissolving for 30min, and putting the mixture into a freeze drier for freeze drying for 24h at the temperature of 48 ℃ below zero to obtain CuO/WO 3 A precursor;
(3) mixing CuO/WO 3 And (3) putting the precursor into a muffle furnace, heating to 440 ℃ at a heating rate of 2 ℃/min, and keeping the temperature for 1 h. Washing the obtained product with distilled water for 3 times, washing the product with absolute ethyl alcohol for 1 time, and drying the product in a 60 ℃ oven for 6 hours to obtain the crystalline two-dimensional porous CuO/WO 3 A nanosheet.
Example 7
Crystalline two-dimensional porous CuO/WO of the present example 3 The preparation method of the nano sheet comprises the following steps:
(1) weighing 1g of sodium sulfate and 1g of potassium chloride, adding 20ml of water, and ultrasonically stirring and dissolving for 15min to form a uniform and stable transparent clear solution;
(2) to the salt solution of (1) was slowly added 400mg WCl 6 And 20mg of CuSO 4 ·5H 2 O, pre-freezing for 14h at the low temperature of 18 ℃ below zero after ultrasonic stirring and dissolving for 10min, and freeze-drying for 24h at 56 ℃ below zero in a freeze dryer after pre-freezing to obtain CuO/WO 3 A precursor;
(3) mixing CuO/WO 3 And (3) putting the precursor into a muffle furnace, heating to 600 ℃ at the heating rate of 2 ℃/min, and keeping the temperature for 1.5 hours. Washing the obtained product with distilled water for 3 times, washing the product with absolute ethyl alcohol for 1 time, and drying the product in a 60 ℃ oven for 5 hours to obtain the crystalline two-dimensional porous CuO/WO 3 Nanosheets.
Example 8
Crystalline two-dimensional porous CuO/WO of the present example 3 The preparation method of the nano sheet comprises the following steps:
(1) weighing 1g of sodium chloride, adding 10ml of water, and ultrasonically stirring and dissolving for 10min to form a uniform and stable transparent clear solution;
(2) to the salt solution of (1) was slowly added 200mg H 4 [Si(W 3 O 10 ) 4 ]·xH 2 O and 10mg of CuCl 2 Pre-freezing at-20 ℃ for 20h after ultrasonic stirring and dissolving for 10min, and freeze-drying at-52 ℃ for 24h in a freeze dryer after pre-freezing to obtain CuO/WO 3 A precursor;
(3) mixing CuO/WO 3 And putting the precursor into a muffle furnace, heating to 400 ℃ at a heating rate of 2 ℃/min, and preserving heat for 1 h. Washing the obtained product with distilled water for 3 times and absolute ethyl alcohol for 1 time, and drying at 60 DEG CDrying in a box for 4 hours to obtain the crystalline two-dimensional porous CuO/WO 3 Nanosheets.
FIG. 1 shows the crystalline two-dimensional porous CuO/WO obtained in this example 3 The product of the XRD spectrogram of the nano sheet is CuO and WO 3 However, since the supported amount of CuO was too low, no diffraction peak of CuO was observed. FIG. 2 is an SEM photograph of a material, CuO/WO 3 In the composite material, CuO nano particles are uniformly dispersed in two-dimensional porous WO 3 On the nanosheet layer. FIG. 3 shows the crystalline two-dimensional porous CuO/WO obtained in this example 3 TEM image of nanosheet, it can be seen that crystalline two-dimensional porous CuO/WO 3 The nanosheet layer is very thin and takes on a porous form.
FIG. 4 shows the crystalline two-dimensional porous CuO/WO obtained in this example 3 The response value of the nano sheet to 50ppm acetoin at 60-160 ℃, and CuO/WO at 100 ℃ can be shown 3 The response to 50ppm acetoin was the highest with a response value of 588.67, so 100 ℃ was specified as the optimum operating temperature. FIG. 5 shows the crystalline two-dimensional porous CuO/WO obtained in this example 3 The long-term stability test of the nano-sheet within 30 days shows that the response value has no large change, which indicates that the crystal two-dimensional porous CuO/WO 3 The stability of the nano-sheet is better.
Example 9
The crystalline two-dimensional porous CuO/WO of the present example 3 The preparation method of the nano sheet comprises the following steps:
(1) weighing 2g of sodium chloride, adding 20ml of water, and ultrasonically stirring and dissolving for 20min to form a uniform and stable transparent clear solution;
(2) to the salt solution of (1) was slowly added 500mg H 4 [Si(W 3 O 10 ) 4 ]·xH 2 O and 5mg Cu (NO) 3 ) 2 Pre-freezing at-18 ℃ for 18h after ultrasonic stirring and dissolving for 10min, and freeze-drying at-50 ℃ for 24h in a freeze dryer after pre-freezing to obtain CuO/WO 3 A precursor;
(3) mixing CuO/WO 3 And (3) putting the precursor into a muffle furnace, heating to 400 ℃ at a heating rate of 1 ℃/min, and keeping the temperature for 2 hours. Washing the obtained product with distilled water for 3 times, washing with anhydrous ethanol for 1 time, and drying in a 60 ℃ oven for 5h to obtain crystalline two-dimensional porousCuO/WO 3 Nanosheets.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. Crystalline two-dimensional porous CuO/WO 3 A nanoplatelet characterized by: the crystalline two-dimensional porous CuO/WO 3 The nano-sheets are synthesized by a space self-limited domain assembly strategy, and CuO nano-particles are uniformly distributed in crystalline two-dimensional porous WO 3 And (3) the surface of the nanosheet.
2. The crystalline two-dimensional porous CuO/WO according to claim 1 3 The preparation method of the nanosheet is characterized by comprising the following steps:
(1) preparing an inorganic salt solution: dissolving inorganic salt in water, and stirring until the solution is transparent and clear to obtain an inorganic salt solution;
(2) preparation of CuO/WO 3 Precursor: dissolving a copper compound and a tungsten compound in an inorganic salt solution, ultrasonically stirring until the copper compound and the tungsten compound are completely dispersed to obtain a mixed solution, pre-freezing the mixed solution at a low temperature, and then putting the pre-frozen mixed solution into a freeze dryer for freeze drying to obtain CuO/WO 3 A precursor;
(3) preparation of crystalline two-dimensional porous CuO/WO 3 Nanosheet: leading the CuO/WO prepared in the step (2) to be 3 Calcining the precursor in a muffle furnace to crystallize the precursor at high temperature, then using deionized water to fully wash off an inorganic salt template, and drying to obtain the crystallized two-dimensional porous CuO/WO 3 Nanosheets.
3. The crystalline two-dimensional porous CuO/WO according to claim 2 3 A process for producing a nanosheet, characterized in that: the inorganic salt in the step (1) is one or more of sodium chloride, potassium sulfate, potassium chloride, ammonium nitrate, potassium bromide, sodium sulfate or sodium nitrate, and the concentration of the inorganic salt solution is 0.05 g/mL-2 g/mL.
4. The crystalline two-dimensional porous CuO/WO according to claim 2 3 The preparation method of the nano-sheet is characterized by comprising the following steps: the copper compound in the step (2) is CuCl 2 、CuSO 4 、CuSO 4 ·5H 2 O or Cu (NO) 3 ) 2 One or more of the above; the tungsten compound is Na 2 WO 4 ·2H 2 O、K 2 WO 4 、(NH 4 ) 6 H 2 W 12 O 40 ·XH 2 O、H 4 [Si(W 3 O 10 ) 4 ]·xH 2 O、WCl 6 One or more of (a).
5. The crystalline two-dimensional porous CuO/WO according to claim 2 3 The preparation method of the nano-sheet is characterized by comprising the following steps: the mass ratio of the tungsten compound to the copper compound in the step (2) is 1: 0.005-1: 0.05; the total concentration of the tungsten compound and the copper compound in the mixed solution is 0.01 g/mL-0.42 g/mL.
6. The crystalline two-dimensional porous CuO/WO according to claim 2 3 A method for producing a nanosheet, comprising: the mass ratio of the inorganic salt to the tungsten compound in the step (2) is 1: 0.01-1: 0.5.
7. The crystalline two-dimensional porous CuO/WO according to claim 2 3 The preparation method of the nano-sheet is characterized by comprising the following steps: in the step (2), the pre-freezing temperature is-18-28 ℃, the pre-freezing time is 12-24h, the freeze-drying temperature is-50 to-65 ℃, and the freeze-drying time is 24-48 h.
8. The crystalline two-dimensional porous CuO/WO according to claim 2 3 The preparation method of the nano-sheet is characterized by comprising the following steps: the calcination temperature in the step (3) is 400-The temperature rise rate is 2-5 ℃/min, and the calcination time is 1-2 h.
9. The crystalline two-dimensional porous CuO/WO according to claim 1 3 The nanosheet is used as a gas sensitive element and applied to the aspect of a high-sensitivity acetoin sensor.
10. Use according to claim 9, characterized in that: when the working temperature is 100 ℃, the crystalline two-dimensional porous CuO/WO 3 The nanosheet as a gas sensor has good selectivity on acetoin and the sensitivity of the nanosheet on 50ppm of acetoin reaches 588.67.
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