CN108011180A - A kind of preparation method of graphene antenna for mobile phone - Google Patents
A kind of preparation method of graphene antenna for mobile phone Download PDFInfo
- Publication number
- CN108011180A CN108011180A CN201711224979.0A CN201711224979A CN108011180A CN 108011180 A CN108011180 A CN 108011180A CN 201711224979 A CN201711224979 A CN 201711224979A CN 108011180 A CN108011180 A CN 108011180A
- Authority
- CN
- China
- Prior art keywords
- mobile phone
- graphene
- graphene oxide
- film
- antenna
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/364—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor
- H01Q1/368—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith using a particular conducting material, e.g. superconductor using carbon or carbon composite
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
Abstract
The invention discloses a kind of preparation method of graphene antenna for mobile phone.Make it more orderly by electric field regulation and control big scale graphene oxide；Printing film forming, thickness control is at 5 100 μm；Orderly big scale graphene oxide film is made；Be placed in graphite high temperature furnace, respectively through 30 180 minutes 200 600 DEG C with 60 180 minutes 2,000 3000 DEG C be heat-treated, last 50 200 DEG C are hot-forming, and flexibility superelevation electrical conductivity flaky graphite alkene film is made；Antenna for mobile phone is designed, and is completed using laser engraving.There is orientation texture, the size of bigger, less interior contact point and contact resistance in high face compared with traditional carbon-based material, it has excellent electric conductivity and low degree impedance, and electrical conductivity is up to 5 × 106S/m, on the basis of original communication function is kept, has lightweight, high heat conduction, low cost, easy to process, environment amenable advantage.
Description
Technical field
The invention belongs to field of material technology, and in particular to a kind of preparation method of graphene antenna for mobile phone.
Background technology
Mobile phone is as essential article in the modern life, in short decades in past, from the shifting of early stage
Mobile phone gradually develops into powerful smart machine today.Antenna for mobile phone, i.e., be used for the equipment for receiving signal, be on mobile phone
The most important component of mobile communication.With the continuous lifting of people's demand, and the continuous development of science and technology, antenna for mobile phone
Development it is irresistible.At present, the material for preparing of most of antenna for mobile phone is the precious metal material such as copper, alloy, material
Material heavier mass itself, it is expensive, and complex manufacturing process, which greatly enhances production cost, and metal antenna is in height
Heat dissipation problem during power is one very big problem, which has limited antenna for mobile phone in lightweight, low consumption, the hair in terms of high heat dissipation
Exhibition.Therefore, a kind of suitable material is found to replace metal material design antenna for mobile phone significant.
In recent years, a variety of allotropes of carbon-based material are widely used receives in electronic field, such as carbon
Mitron, graphene, graphite etc..Excellent carbon-based material shows more advantageous property than most metals, for example, lightweight, flexibility,
Mechanical Reliability, portable traveling, optical characteristics and reliability in the presence of a harsh environment etc..Since it has good characteristic, various carbon
Sill is used to make frequency microwave device.For example MitraAkbari etc. was reported in 2016 graphene being used as manufacture
The material of antenna, has designed and produced a kind of dipole antenna [IEEE Antennas＆Wireless Propagation
Letters,2016,15:1569-1572.].Research has shown that the antenna of carbon-based material has low cost, environment amenable spy
Point.And for example A.Mehdipour et al. was reported in 2009 and is designed and produced out a kind of teledish using carbon fiber
[IEEEXplore,2009:1-4.]。
However, the conductivity of Thin film conductive performance opposing metallic material prepared by new carbon used at present
(107S/m it is) also much insufficient, and surface resistance is larger, the performance such as made antenna gain is undesirable.Particularly by graphene
More technical bottlenecks will be faced as antenna for mobile phone making material, such as because the deficiency of graphene film electrical conductivity causes antenna for mobile phone
Radiation efficiency is not high, influences the performance of mobile phone each side communication.
The content of the invention
Present invention aims at provide a kind of mobile phone master prepared by superelevation electrical conductivity, lightweight, high heat conduction graphene film
All kinds of antenna for mobile phone such as antenna, WIFI antennas.
It is as follows using technical solution to reach above-mentioned purpose：
A kind of preparation method of graphene antenna for mobile phone, it is characterised in that comprise the following steps：
1) make it more orderly by electric field regulation and control big scale graphene oxide；Printing film forming, thickness control is in 5-100
μm；Orderly big scale graphene oxide film is made；
2) take step 1 gained graphene oxide film to be placed in graphite high temperature furnace, respectively through 30-180 minutes 200-600 DEG C with
2000-3000 DEG C of heat treatment in 60-180 minutes, last 50-200 DEG C hot-forming, and flexibility superelevation electrical conductivity flaky graphite is made
Alkene film；
3) using step 2 gained graphene film design antenna for mobile phone, and completed using laser engraving.
A kind of preparation method of graphene antenna for mobile phone, it is characterised in that comprise the following steps：
1) make it more orderly by electric field regulation and control big scale graphene oxide, then by the stronger oxidation stone of order
Orderly big scale graphene oxide film is made at 100 μm in black alkene film forming, thickness control；
2) obtained ordered graphene oxide films in step 1 are taken, are placed in graphite high temperature furnace, respectively by 120 minutes 500
DEG C carbonization was handled with 120 minutes 2500 DEG C of high temperature graphitizations, and last further hot-forming, the temperature of hot pressing is 200 DEG C, is made
Flexible graphene film.
3) using step 2 gained graphene film design antenna for mobile phone, and completed using laser engraving.
A kind of preparation method of graphene antenna for mobile phone, it is characterised in that comprise the following steps：
1) make it more orderly by electric field regulation and control big scale graphene oxide, then by the stronger oxidation stone of order
Orderly big scale graphene oxide film is made at 80 μm in black alkene film forming, thickness control；
2) obtained ordered graphene oxide films in step 1 are taken, are placed in graphite high temperature furnace, respectively by 180 minutes 200
DEG C carbonization was handled with 90 minutes 2000 DEG C of high temperature graphitizations, and last further hot-forming, the temperature of hot pressing is 100 DEG C, is made
Flexible graphene film.
3) using step 2 gained graphene film design antenna for mobile phone, and completed using laser engraving.
A kind of preparation method of graphene antenna for mobile phone, it is characterised in that comprise the following steps：
1) make it more orderly by electric field regulation and control big scale graphene oxide, then by the stronger oxidation stone of order
Orderly big scale graphene oxide film is made at 5 μm in black alkene film forming, thickness control；
2) obtained ordered graphene oxide films in step 1 are taken, are placed in graphite high temperature furnace, respectively by 30 minutes 600
DEG C carbonization was handled with 60 minutes 3000 DEG C of high temperature graphitizations, and last further hot-forming, the temperature of hot pressing is 50 DEG C, is made soft
Property graphene film；
3) using step 2 gained graphene film design antenna for mobile phone, and completed using laser engraving.
The present invention has the advantage that relative to the prior art：
The graphene antenna for mobile phone of the present invention is on the basis of original communication function is kept, also with lightweight, high heat conduction, low
Cost, easy to process, environment amenable advantage.
Graphene film prepared by the present invention has orientation texture in high face, presoma tool compared with traditional carbon-based material
There is the size of bigger so that its interior contact point tails off, and contact resistance is lower, therefore it has excellent electric conductivity and low degree resistance
Anti-, its electrical conductivity is up to 5 × 106S/m, can compare metallic conductivity, this provides necessary for making high-performance antenna for mobile phone
Electrical conductivity.
In addition, the graphene film density of the present invention is only 1.5g/cm3, it is only 1/6th of copper, thermal conductivity factor is
1932.73W m-1K-1, this greatly exceeds thermal conductivity factor (the 398W m of metallic copper-1K-1), this is making lightweight, excellent heat conductivity
Graphene antenna for mobile phone provide condition.
The graphene antenna for mobile phone of the present invention is for application of the carbon-based material in field of antenna especially antenna for mobile phone and hair
Exhibition, which has, greatly facilitates effect
Brief description of the drawings
Fig. 1：Graphene film section electron microscope；
Fig. 2：Graphene mobile phone primary antenna；
Fig. 3：Graphene primary antenna is applied to mobile phone pictorial diagram；
Fig. 4：Graphene antenna mobile phone and regular handset fever comparison diagram；
Fig. 5：Graphene antenna mobile phone bluetooth communications capability figure.
Embodiment
Following embodiments further explain technical scheme, but not as limiting the scope of the invention.
Embodiment 1
1) Flexible graphene film is prepared：Make it more orderly by electric field regulation and control big scale graphene oxide, then
By the stronger graphene oxide film forming of order, orderly big scale graphene oxide film is made at 100 μm in thickness control；
2) obtained ordered graphene oxide films in step 1) are taken, are placed in graphite high temperature furnace, respectively by 120 minutes
500 DEG C of carbonizations were handled with 120 minutes 2500 DEG C of high temperature graphitizations, last further hot-forming, and the temperature of hot pressing is 200 DEG C,
Flexible graphene film is made；
3) obtained Flexible graphene membrane sample in step 2) is taken, surface sweeping Electronic Speculum is shot, its order is tested, such as Fig. 1 institutes
Show, it can be seen from the figure that graphene film interlayer arranges very well ordered, which greatly enhances its electrical conductivity.
4) obtained Flexible graphene membrane sample in step 2) is taken, tests its electrical conductivity, resistivity, density and thermal conductivity factor
Etc. characteristic；Through measuring, the electrical conductivity of graphene film is 5 × 106S/m, density are only 1.5g/cm3, thermal conductivity factor is up to
1932.73W m-1K-1；
5) characteristics such as electrical conductivity, the magnetic conductivity of graphene film are measured according to step step 4), are set with electromagnetic simulation software
Mobile phone primary antenna is counted, is carved superelevation electrical conductivity, lightweight, high heat conduction graphene film using laser engraving machine according to simulation result
Carve, graphene mobile phone principal communication antenna is made, as shown in Figure 2.Then by graphene antenna applications to mobile phone, as shown in Figure 3.
Last test conversation function of mobile phone, graphene antenna mobile phone call function are normal.Graphene antenna mobile phone is conversed 2 hours,
The heat condition of testing mobile phone, as shown in figure 4, it can be seen from the figure that after extended telephone conversation, the temperature of graphene antenna for mobile phone
Degree is more than 5 DEG C lower than original mobile phone temp.
Embodiment 2
1) Flexible graphene film is prepared：Make it more orderly by electric field regulation and control big scale graphene oxide, then
By the stronger graphene oxide film forming of order, orderly big scale graphene oxide film is made at 80 μm in thickness control；
2) obtained ordered graphene oxide films in step 1) are taken, are placed in graphite high temperature furnace, respectively by 180 minutes
200 DEG C of carbonizations were handled with 90 minutes 2000 DEG C of high temperature graphitizations, last further hot-forming, and the temperature of hot pressing is 100 DEG C, system
Obtain Flexible graphene film；
3) obtained Flexible graphene membrane sample in step 2) is taken, surface sweeping Electronic Speculum is shot, tests its order.
4) obtained Flexible graphene membrane sample in step 2) is taken, tests its electrical conductivity, resistivity, density and thermal conductivity factor
Etc. characteristic；Through measuring, the electrical conductivity of graphene film is 2.5 × 106S/m, density are only 1.5g/cm3, thermal conductivity factor is up to
1600W m-1K-1；
5) characteristics such as electrical conductivity, the magnetic conductivity of graphene film are measured according to step step 4), are set with electromagnetic simulation software
Bluetooth of mobile phone antenna is counted, carries out superelevation electrical conductivity, lightweight, high heat conduction graphene film using laser engraving machine according to simulation result
Engraving, is made graphene bluetooth cellular phone antenna, and then by graphene antenna applications to mobile phone, last test Bluetooth of mobile phone communicates
Function, as shown in figure 5, as can be seen from the figure graphene antenna mobile phone bluetooth transmission speed is similar with former mobile phone, reaches as high as
170KB/s。
Embodiment 3
1) Flexible graphene film is prepared：Make it more orderly by electric field regulation and control big scale graphene oxide, then
By the stronger graphene oxide film forming of order, orderly big scale graphene oxide film is made at 5 μm in thickness control；
2) obtained ordered graphene oxide films in step 1) are taken, are placed in graphite high temperature furnace, respectively by 30 minutes 600
DEG C carbonization was handled with 60 minutes 3000 DEG C of high temperature graphitizations, and last further hot-forming, the temperature of hot pressing is 50 DEG C, is made soft
Property graphene film；
3) obtained Flexible graphene membrane sample in step 2) is taken, surface sweeping Electronic Speculum is shot, tests its order.
4) obtained Flexible graphene membrane sample in step 2) is taken, tests its electrical conductivity, resistivity, density and thermal conductivity factor
Etc. characteristic；Through measuring, the electrical conductivity of graphene film is 1.1 × 106S/m, density are only 1.5g/cm3, thermal conductivity factor is up to
1200W m-1K-1；
5) characteristics such as electrical conductivity, the magnetic conductivity of graphene film are measured according to step step 4), are set with electromagnetic simulation software
Mobile phone WiFi antennas are counted, carry out superelevation electrical conductivity, lightweight, high heat conduction graphene film using laser engraving machine according to simulation result
Engraving, is made graphene WiFi handset antenna, then by graphene antenna applications to mobile phone, last test mobile phone WiFi work(
Can, big video file is downloaded, speed of download can maintain 2Mb/s, and speed of download is fast and performance is stablized.
Claims (4)
1. a kind of preparation method of graphene antenna for mobile phone, it is characterised in that comprise the following steps：
1) make it more orderly by electric field regulation and control big scale graphene oxide；Printing film forming, thickness control is at 5-100 μm；
Orderly big scale graphene oxide film is made；
2) step 1 gained graphene oxide film is taken to be placed in graphite high temperature furnace, respectively through 30-180 minutes 200-600 DEG C and 60-
2000-3000 DEG C of heat treatment in 180 minutes, last 50-200 DEG C hot-forming, and flexibility superelevation electrical conductivity flaky graphite alkene is made
Film；
3) using step 2 gained graphene film design antenna for mobile phone, and completed using laser engraving.
2. a kind of preparation method of graphene antenna for mobile phone, it is characterised in that comprise the following steps：
1) make it more orderly by electric field regulation and control big scale graphene oxide, then by the stronger graphene oxide of order
Orderly big scale graphene oxide film is made at 100 μm in film forming, thickness control；
2) obtained ordered graphene oxide films in step 1 are taken, are placed in graphite high temperature furnace, respectively by 120 minutes 500 DEG C of carbon
Change and handled with 120 minutes 2500 DEG C of high temperature graphitizations, last further hot-forming, the temperature of hot pressing is 200 DEG C, and flexibility is made
Graphene film.
3) using step 2 gained graphene film design antenna for mobile phone, and completed using laser engraving.
3. a kind of preparation method of graphene antenna for mobile phone, it is characterised in that comprise the following steps：
1) make it more orderly by electric field regulation and control big scale graphene oxide, then by the stronger graphene oxide of order
Orderly big scale graphene oxide film is made at 80 μm in film forming, thickness control；
2) obtained ordered graphene oxide films in step 1 are taken, are placed in graphite high temperature furnace, respectively by 180 minutes 200 DEG C of carbon
Change and handled with 90 minutes 2000 DEG C of high temperature graphitizations, last further hot-forming, the temperature of hot pressing is 100 DEG C, and flexibility is made
Graphene film.
3) using step 2 gained graphene film design antenna for mobile phone, and completed using laser engraving.
4. a kind of preparation method of graphene antenna for mobile phone, it is characterised in that comprise the following steps：
1) make it more orderly by electric field regulation and control big scale graphene oxide, then by the stronger graphene oxide of order
Orderly big scale graphene oxide film is made at 5 μm in film forming, thickness control；
2) obtained ordered graphene oxide films in step 1 are taken, are placed in graphite high temperature furnace, respectively by 30 minutes 600 DEG C of carbon
Change and handled with 60 minutes 3000 DEG C of high temperature graphitizations, last further hot-forming, the temperature of hot pressing is 50 DEG C, and flexibility stone is made
Black alkene film；
3) using step 2 gained graphene film design antenna for mobile phone, and completed using laser engraving.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711224979.0A CN108011180A (en) | 2017-11-24 | 2017-11-24 | A kind of preparation method of graphene antenna for mobile phone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711224979.0A CN108011180A (en) | 2017-11-24 | 2017-11-24 | A kind of preparation method of graphene antenna for mobile phone |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108011180A true CN108011180A (en) | 2018-05-08 |
Family
ID=62054654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711224979.0A Pending CN108011180A (en) | 2017-11-24 | 2017-11-24 | A kind of preparation method of graphene antenna for mobile phone |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108011180A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111800941A (en) * | 2019-04-08 | 2020-10-20 | 武汉理工大学 | Graphene circuit board and preparation method thereof |
| CN112133997A (en) * | 2020-09-11 | 2020-12-25 | 武汉汉烯科技有限公司 | Graphene NFC tag antenna |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021633A (en) * | 2009-09-09 | 2011-04-20 | 中国科学院金属研究所 | Preparation method of graphene thin film field emission material |
| CN104616826A (en) * | 2014-12-30 | 2015-05-13 | 浙江大学 | Graphene-PDMS (Polydimethylsiloxane) flexible electrode and preparation method and application thereof |
| CN105331932A (en) * | 2014-08-12 | 2016-02-17 | 湖南元素密码石墨烯研究院（有限合伙） | Manufacturing method for impact resistant three-dimensional graphene thin film |
| CN105523547A (en) * | 2016-01-25 | 2016-04-27 | 浙江大学 | Graphene film with ultrahigh flexibility and high thermal conductivity and preparation method of graphene film |
| CN105542728A (en) * | 2016-01-24 | 2016-05-04 | 北京大学 | Method for preparing vertical orientation graphene sheet/high polymer thermal interface material |
| CN105600782A (en) * | 2016-03-04 | 2016-05-25 | 深圳丹邦科技股份有限公司 | Graphene film prepared from flexible polyimide and preparing method thereof |
| CN106698407A (en) * | 2017-03-16 | 2017-05-24 | 北京化工大学 | Flexible graphene film capable of being repeatedly folded, preparation method of flexible graphene film and flexible device comprising flexible graphene film |
| CN107274958A (en) * | 2017-06-16 | 2017-10-20 | 武汉理工大学 | A kind of frequency microwave device and micro nitrogen-doped graphene film |
-
2017
- 2017-11-24 CN CN201711224979.0A patent/CN108011180A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021633A (en) * | 2009-09-09 | 2011-04-20 | 中国科学院金属研究所 | Preparation method of graphene thin film field emission material |
| CN105331932A (en) * | 2014-08-12 | 2016-02-17 | 湖南元素密码石墨烯研究院（有限合伙） | Manufacturing method for impact resistant three-dimensional graphene thin film |
| CN104616826A (en) * | 2014-12-30 | 2015-05-13 | 浙江大学 | Graphene-PDMS (Polydimethylsiloxane) flexible electrode and preparation method and application thereof |
| CN105542728A (en) * | 2016-01-24 | 2016-05-04 | 北京大学 | Method for preparing vertical orientation graphene sheet/high polymer thermal interface material |
| CN105523547A (en) * | 2016-01-25 | 2016-04-27 | 浙江大学 | Graphene film with ultrahigh flexibility and high thermal conductivity and preparation method of graphene film |
| CN105600782A (en) * | 2016-03-04 | 2016-05-25 | 深圳丹邦科技股份有限公司 | Graphene film prepared from flexible polyimide and preparing method thereof |
| CN106698407A (en) * | 2017-03-16 | 2017-05-24 | 北京化工大学 | Flexible graphene film capable of being repeatedly folded, preparation method of flexible graphene film and flexible device comprising flexible graphene film |
| CN107274958A (en) * | 2017-06-16 | 2017-10-20 | 武汉理工大学 | A kind of frequency microwave device and micro nitrogen-doped graphene film |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111800941A (en) * | 2019-04-08 | 2020-10-20 | 武汉理工大学 | Graphene circuit board and preparation method thereof |
| CN112133997A (en) * | 2020-09-11 | 2020-12-25 | 武汉汉烯科技有限公司 | Graphene NFC tag antenna |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108430204B (en) | Magnetic isolation material and preparation method and application thereof | |
| CN1926060B (en) | Exfoliated graphite sheet | |
| CN109195326B (en) | Manufacturing method of flexible circuit board for wireless charging of mobile phone | |
| CN104091787A (en) | Metallic packaging shell and manufacturing technology thereof | |
| CN108011180A (en) | A kind of preparation method of graphene antenna for mobile phone | |
| CN101834070A (en) | AgWC (wolfram carbide) electrical contact material and manufacturing method thereof | |
| JP2015204337A (en) | Electronic component, method of manufacturing electronic component and electronic apparatus | |
| CN111145960A (en) | High-strength high-conductivity copper-based composite material and preparation method thereof | |
| CN112435845A (en) | Integrated co-fired inductor and preparation method thereof | |
| CN109851346B (en) | High-frequency manganese-zinc soft magnetic ferrite material and preparation method and application thereof | |
| CN109735826A (en) | A kind of graphene/copper composite material and its preparation method and application | |
| CN111069611A (en) | Preparation method of graphite-graphene-metal composite material | |
| CN102516952A (en) | Method for preparing composite film sheet material from organic silicon and graphite | |
| CN102031490B (en) | High-strength high-conductivity nanocrystal copper material and preparation method thereof | |
| CN107834169A (en) | A kind of high conductivity multi-layer graphene thick film and impedance loading shape radio frequency recognizing electronic label | |
| CN107705871B (en) | Ultrahigh-conductivity large-size graphene film and radio frequency microwave device | |
| CN112435822B (en) | Preparation method of high-efficiency Fe-Si-Al magnetic powder core and prepared Fe-Si-Al magnetic powder core | |
| CN109295333A (en) | The preparation method of three-dimensional grapheme-carbon/carbon-copper composite material and composite electric wire | |
| CN108409310A (en) | The ceramic base PCB copper-clad plates and preparation method that a kind of graphene is modified | |
| CN106083035A (en) | A kind of piezoelectric acceleration transducer using nano barium phthalate ceramic standby | |
| CN102300347B (en) | Silicon nitride composite heat-generation body and manufacturing method thereof | |
| CN107274958A (en) | A kind of frequency microwave device and micro nitrogen-doped graphene film | |
| CN112133997A (en) | Graphene NFC tag antenna | |
| CN108492976B (en) | Coil structure and preparation method of composite coil structure | |
| CN112299482A (en) | Method for reducing thermal conductivity of bismuth sulfide thermoelectric material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180508 |