Influence of reduction temperature of graphene oxide on cross sensitivity between humidity and formaldehyde

Dehui LEI; Tongjiang PENG; Hongjuan SUN; Guangping TANG; Jianzhao YANG; Yazhou REN; Lili WANG

doi:10.11949/j.issn.0438-1157.20180681

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Influence of reduction temperature of graphene oxide on cross sensitivity between humidity and formaldehyde

Material science and engineering, nanotechnology | 更新时间：2020-06-24

- Influence of reduction temperature of graphene oxide on cross sensitivity between humidity and formaldehyde
- CIESC Journal Vol. 70, Issue 1, Pages: 309-318(2019)
- 作者机构：
  
  1.西南科技大学理学院，四川绵阳 621010
  2.西南科技大学固体废物处理与资源化教育部重点实验室，四川绵阳 621010
  3.西南科技大学矿物材料及应用研究所，四川绵阳 621010
  4.中国工程物理研究院机械制造工业研究所，四川绵阳 621900
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20180681
  CLC： TQ 110.3 O 647.3
- Received：21 June 2018，
  
  Revised：2018-10-15，
  
  Published：05 January 2019
- 稿件说明：
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雷德会, 彭同江, 孙红娟, 汤光平, 杨建召, 任亚周, 王丽丽. 还原温度对氧化石墨烯的湿度-甲醛交叉敏感性能的影响[J]. 化工学报, 2019, 70(1): 309-318

LEI Dehui, PENG Tongjiang, SUN Hongjuan, TANG Guangping, YANG Jianzhao, REN Yazhou, WANG Lili. Influence of reduction temperature of graphene oxide on cross sensitivity between humidity and formaldehyde[J]. CIESC Journal, 2019, 70(1): 309-318
雷德会, 彭同江, 孙红娟, 汤光平, 杨建召, 任亚周, 王丽丽. 还原温度对氧化石墨烯的湿度-甲醛交叉敏感性能的影响[J]. 化工学报, 2019, 70(1): 309-318 DOI： 10.11949/j.issn.0438-1157.20180681.

LEI Dehui, PENG Tongjiang, SUN Hongjuan, TANG Guangping, YANG Jianzhao, REN Yazhou, WANG Lili. Influence of reduction temperature of graphene oxide on cross sensitivity between humidity and formaldehyde[J]. CIESC Journal, 2019, 70(1): 309-318 DOI： 10.11949/j.issn.0438-1157.20180681.

摘要

以氧化石墨烯溶胶为前体，通过旋涂工艺制备薄膜型气敏元件，在低温80～180℃下进行热处理，获得系列不同还原程度的还原氧化石墨烯气敏元件，采用XRD、AFM、FT-IR、XPS对样品的层结构、薄膜厚度及含氧官能团变化属性进行表征，将气敏薄膜元件在相对湿度为11.3%～93.6%的范围内进行预湿处理，并测定元件对甲醛气氛的敏感性能。结果表明：随热还原处理温度的升高，氧化石墨烯的结构逐渐向类石墨结构转变，含氧官能团逐渐脱失，缺陷增多，薄膜的方块电阻呈数量级地减小，从41 MΩ减小至928 Ω；经不同湿度预处理的气敏元件置于甲醛气氛中产生了水分子与甲醛分子的竞争吸附，从而导致电阻的明显变化；在10

-4

甲醛气氛下，未还原或热还原温度较低的气敏元件适用于低、高湿环境下甲醛气氛的气敏测试，最大灵敏度为69.1%，而还原温度适中的元件则适用于中湿环境的甲醛测试，最大灵敏度为80.3%。

Abstract

As precursors

graphite oxide samples are exfoliated and used to prepare graphene oxide thin films by gas spin coating with Ag-Pd integrated electronic device (Ag-Pd IED). The graphene oxide thin films are annealed at 80—180℃ to obtain a series of reduced graphene oxide gas sensing element samples with different reduction degrees

and the layer structures

film thickness and functional groups change properties of all the samples are investigated by X-ray diffraction spectroscopy

Fourier transform infrared spectroscopy

Atomic force microscope and X-ray photoelectron spectroscopy. The prehumidification treatment with the relative humidity from 11.3% to 93.6%

the gas sensitivity tests are carried out to reduced graphene oxide thin film gas sensing element. Then the formaldehyde gas sensing measurement are also implemented. The results show that the structure of the graphene oxide samples are transformed to the graphitic structure after reduction at different thermal treatment temperatures. The oxygen functional groups on the surface of graphene oxide gradually pyrolyzed

the defects increase

the structure of graphene gradually changes to similar to graphite

and the resistance of the samples were significantly reduced in magnitude with 41 MΩ to 928 Ω. The samples with different relative humidity pretreated produced competitive adsorption of water molecules and formaldehyde molecules in formaldehyde atmosphere

leading to obvious changes in resistance. When exposed to the 10

-4

formaldehyde gas at room temperature

unreduced or the reduced products at low temperature show good sensitivity of 69.1% to formaldehyde gas in high humidity environment. In medium humidity environment

the reduced products at medium temperature which exhibit a best sensitivity of 80.3% are suitable for the test of formaldehyde gas.

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references

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