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A 3D Chemically Modified Graphene Hydrogel for Fast, Highly Sensitive, and Selective Gas Sensor
Wu, Jin1; Tao, Kai1; Guo, Yuanyuan3; Li, Zhong1; Wang, Xiaotian3; Luo, Zhongzhen3; Feng, Shuanglong2; Du, Chunlei2; Chen, Di4,5; Miao, Jianmin1
2017-03-01
摘要Reduced graphene oxide (RGO) has proved to be a promising candidate in high-performance gas sensing in ambient conditions. However, trace detection of different kinds of gases with simultaneously high sensitivity and selectivity is challenging. Here, a chemiresistor-type sensor based on 3D sulfonated RGO hydrogel (S-RGOH) is reported, which can detect a variety of important gases with high sensitivity, boosted selectivity, fast response, and good reversibility. The NaHSO3 functionalized RGOH displays remarkable 118.6 and 58.9 times higher responses to NO2 and NH3, respectively, compared with its unmodified RGOH counterpart. In addition, the S-RGOH sensor is highly responsive to volatile organic compounds. More importantly, the characteristic patterns on the linearly fitted response-temperature curves are employed to distinguish various gases for the first time. The temperature of the sensor is elevated rapidly by an imbedded microheater with little power consumption. The 3D S-RGOH is characterized and the sensing mechanisms are proposed. This work gains new insights into boosting the sensitivity of detecting various gases by combining chemical modification and 3D structural engineering of RGO, and improving the selectivity of gas sensing by employing temperature dependent response characteristics of RGO for different gases.
DOI10.1002/advs.201600319
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发表期刊ADVANCED SCIENCE
ISSN2198-3844
卷号4期号:3页码:9
通讯作者Miao, JM (reprint author), Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore. ; Feng, SL (reprint author), Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Micronano Mfg & Syst Integrat Ctr, Chongqing 400714, Peoples R China.
收录类别SCI
WOS记录号WOS:000397116000010
语种英语