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Open Access Nano Express

Ammonia gas sensors based on chemically reduced graphene oxide sheets self-assembled on Au electrodes

Yanyan Wang1*, Liling Zhang2, Nantao Hu2*, Ying Wang2, Yafei Zhang2, Zhihua Zhou3, Yanhua Liu1, Su Shen1 and Changsi Peng1

Author Affiliations

1 College of Physics, Optoelectronics and Energy, Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, People's Republic of China

2 Key Laboratory for Thin Film and Micro fabrication of the Ministry of Education, Department of Microelectronics and Nanoscience, School of electronic information and electrical engineering, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China

3 State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Microelectronics and Solid-State Electronics, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China

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Nanoscale Research Letters 2014, 9:251  doi:10.1186/1556-276X-9-251

Published: 21 May 2014

Abstract

We present a useful ammonia gas sensor based on chemically reduced graphene oxide (rGO) sheets by self-assembly technique to create conductive networks between parallel Au electrodes. Negative graphene oxide (GO) sheets with large sizes (>10 μm) can be easily electrostatically attracted onto positive Au electrodes modified with cysteamine hydrochloride in aqueous solution. The assembled GO sheets on Au electrodes can be directly reduced into rGO sheets by hydrazine or pyrrole vapor and consequently provide the sensing devices based on self-assembled rGO sheets. Preliminary results, which have been presented on the detection of ammonia (NH3) gas using this facile and scalable fabrication method for practical devices, suggest that pyrrole-vapor-reduced rGO exhibits much better (more than 2.7 times with the concentration of NH3 at 50 ppm) response to NH3 than that of rGO reduced from hydrazine vapor. Furthermore, this novel gas sensor based on rGO reduced from pyrrole shows excellent responsive repeatability to NH3. Overall, the facile electrostatic self-assembly technique in aqueous solution facilitates device fabrication, the resultant self-assembled rGO-based sensing devices, with miniature, low-cost portable characteristics and outstanding sensing performances, which can ensure potential application in gas sensing fields.

Keywords:
Graphene; Self-assembly; Pyrrole; Ammonia; Gas sensor