化工学报2019，Vol.70Issue(1)：309-318,10.DOI:10.11949/j.issn.0438⁃1157.20180681
还原温度对氧化石墨烯的湿度-甲醛交叉敏感性能的影响
Influence of reduction temperature of graphene oxide on cross sensitivity between humidity and formaldehyde
摘要
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.关键词
氧化石墨烯/还原/含氧官能团/化学分析/吸附/脱附/交叉灵敏Key words
graphene oxide/reduction/oxygen-containing functional groups/chemical analysis/adsorption/desorption/cross sensitivity分类
化学化工引用本文复制引用
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):309-318,10.基金项目
国家自然科学基金项目(U1630132,41772036) （U1630132,41772036）
四川省科技厅项目(2016GZ0428,2017GZ0114) （2016GZ0428,2017GZ0114）
西南科技大学研究生创新基金(17ycx072) （17ycx072）
