A novel gas sensor based on porous α-Ni(OH)2 ultrathin nanosheet/reduced graphene oxide composites for room temperature detection of NOx

Ying Yang; Hongjie Wang; Linlin Wang; Yunlong Ge; Kan Kan; Keying Shi; Junhong Chen

doi:10.1039/C5NJ03284A

A novel gas sensor based on porous α-Ni(OH)₂ ultrathin nanosheet/reduced graphene oxide composites for room temperature detection of NO_x†

Ying Yang,^ab Hongjie Wang,^a Linlin Wang,^a Yunlong Ge,^a Kan Kan,^a Keying Shi*^a and Junhong Chen*^c

* Corresponding authors

^a Key Laboratory of Functional Inorganic Material Chemistry, Ministry of Education, Key Laboratory of Physical Chemistry, School of Chemistry and Material Science, Heilongjiang University, Harbin, P. R. China
E-mail: shikeying2008@163.com
Fax: +86 4518667 3647
Tel: +86 451 8660 9141

^b Key Laboratory of Applied Chemistry and Nanotechnology at Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022, P. R. China

^c Department of Mechanical Engineering, University of Wisconsin-Milwaukee, 3200 North Cramer Street, Milwaukee, Wisconsin 53211, USA

Abstract

A novel composite room temperature (RT) gas sensor based on a α-Ni(OH)₂ thin nanosheet (TNS)/reduced graphene oxide composite (α-Ni(OH)₂ TNS/rGO composites) was successfully synthesized via a facile reflux method. In this synthesis, Ni²⁺ and urea were adsorbed on GO through electrostatic interactions in a water solution. The subsequent reflux treatment led to the transformation of the Ni(OH)₂ TNS coated on GO and also to the reduction of graphene oxide. Compared to the pristine Ni(OH)₂ TNS prepared in the absence of GO, the prepared α-Ni(OH)₂ TNS/rGO composite showed higher NO_x gas sensing performance with a low detection limit of 970 ppb, high response and fast response at RT. The enhanced sensing properties are attributed to the synergy of the superior conductivity of rGO and the 3D nanostructure of the α-Ni(OH)₂ TNS/rGO composite. The present strategy for combining various hydroxide and nanoscaled building blocks into integrated 3D structures will open new opportunities for designing and synthesizing multifunctional composites.

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Article information

DOI: https://doi.org/10.1039/C5NJ03284A
Article type: Paper
Submitted: 20 Nov 2015
Accepted: 10 Mar 2016
First published: 11 Mar 2016
This article is Open Access

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New J. Chem., 2016,40, 4678-4686

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A novel gas sensor based on porous α-Ni(OH)₂ ultrathin nanosheet/reduced graphene oxide composites for room temperature detection of NO_x

Y. Yang, H. Wang, L. Wang, Y. Ge, K. Kan, K. Shi and J. Chen, New J. Chem., 2016, 40, 4678 DOI: 10.1039/C5NJ03284A

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