An In2O3 nanorod-decorated reduced graphene oxide composite as a high-response NOx gas sensor at room temperature. (3rd July 2017)

• Record Type: Journal Article
• Authors: Fang, Wencheng; Yang, Ying; Yu, Hui; Dong, Xiangting; Wang, Ruihong; Wang, Tingting; Wang, Jinxian; Liu, Zhelin; Zhao, Bo; Wang, Xinlu
• Is Part Of: New journal of chemistry. Volume 41:Number 15(2017)
• Page Start: 7517
• Page End: 7523
• Publication Date: 2017-07-03
• Subjects: Chemistry -- Periodicals; Chimie -- Périodiques; 540
• DOI: 10.1039/c7nj00993c
• Languages: English
• ISSNs: 1144-0546

Abstract

Abstract : An In2 O3 nanorod-decorated reduced graphene oxide composite has been successfully synthesized, and this composite shows a good response, fast response time to NO x with good selectivity and low detection limit at room temperature. Abstract : A novel composite room temperature gas sensor based on an In2 O3 nanorod-decorated reduced graphene oxide composite (In2 O3 NR/rGO composite) was successfully synthesized via a facile reflux method. In this synthesis, In 3+ and urea were adsorbed on GO through electrostatic interactions in a water solution. The subsequent reflux treatment led to the transformation of the In(OH)3 nanorods coated on GO and also to the reduction of graphene oxide. We demonstrate that the composite can detect NO x gas with a response of 1.45, a fast response time of 25.0 s for 97.0 ppm NO x and a low detection limit of 970 ppb at room temperature. Compared with the pure In2 O3 NRs, the composite has a faster response within 30.0 s over the whole range of NO x concentration. The enhanced sensing properties are attributed to the synergy of the superior conductivity of rGO and the nanostructure of the In2 O3 NR/rGO composite. The present strategy for combining various hydroxide and nanoscale building blocks into integrated 3D structures will open new opportunities for designing and synthesizing multifunctional composites.