Citation: CHEN Jun-Gang, PENG Tong-Jiang, SUN Hong-Juan, LIU Bo, ZHAO Er-Zheng. Influence of Reduction Temperature on Functional Groups, Structures and Humidity Sensitivity of Graphite Oxide[J]. Chinese Journal of Inorganic Chemistry, ;2014, 30(4): 779-785. doi: 10.11862/CJIC.2014.153 shu

Influence of Reduction Temperature on Functional Groups, Structures and Humidity Sensitivity of Graphite Oxide

1.
1 School of Science, Southwest University of Science & Technology, Mianyang, Sichuan 621010, China;

Corresponding author: PENG Tong-Jiang,
Received Date: 28 July 2013
Available Online: 11 December 2013
Fund Project: 国家自然科学基金资助项目(No.41272051)；西南科技大学博士基金(No.11ZX7135)。 (No.41272051)；西南科技大学博士基金(No.11ZX7135)

Based on the various functional groups of graphite oxide, the influence of reduction temperature on structures and humidity sensitivity of graphite oxide has been studied. High oxidized graphene oxide samples prepared by modified Hummers method were reduced at different temperature. And the humidity sensors were made with the reduction products. Functional groups and structures changes of the experiment process samples were carried out by FTIR, XRD and Raman spectrum. The results show that functional groups of -OH, epoxy group, C=O and COOH were combined with the structure layer of carbon atoms during oxidation process. And the basal spacing of graphite oxide is about 0.9084 nm. As the increase of reduction temperature, functional groups were gradually thermal decomposition and the graphitization area gradually restored, but the relative sizes were decreased and the defects were increased. Furthermore, the basal spacing of graphite oxide was decreased from 0.9084 nm to 0.4501 nm along the c axis. The resistances of the graphite oxide thin film were decreased from 10.32 MΩ to 41.1 Ω. In the relative humidity of 11.3%~93.6%, the resistance of the graphite oxide thin film humidity elements was significantly reduced with increasing of humidity. The higher of the reduction degree was, the longer of element's response time was and the shorter of the element's desorption time was. The graphite oxide film humidity element of 150 ℃ reduction was the best humidity sensitive performance.
- reduction temperature;graphite oxide;functional groups;structure;humidity-sensitive properties and mechanism
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沈阳化工大学材料科学与工程学院沈阳 110142