Singh, Gaurav and Choudhary, Anshul and Haranath, D. and Joshi, Amish G. and Singh, Nahar and Singh, Sukhvir and Pasricha, Renu (2012) ZnO decorated luminescent graphene as a potential gas sensor at room temperature. Carbon, 50 (2). 385-394. ISSN 0008-6223

PDF - Published Version Restricted to Registered users only Download (1232Kb) | Request a copy

Abstract

We present a simplistic single step synthesis and a detailed study of the remarkable room temperature gas sensing and photoluminescence (PL) properties of zinc oxide (ZnO) decorated graphene oxide sheets (GrO). Investigation of opto-electronic properties reveal near UV to blue PL and semiconducting behavior of ZnO-GrO sheets. ZnO nano-crystallites serve the dual purpose of acting as a nano-spacer between dried graphene sheets as well as a primary sensing transducer for the gas sensing applications. PL has been used as a tool to study the defects associated with the surface of the nanocrystallite's trap levels and/or acceptor-donor recombinations. Time-resolved PL was used to determine free carrier or exciton lifetimes, a vital parameter related to quality of composite and device performance. Results are presented for the detection of common industrial toxins like CO, NH(3) and NO for concentrations as low as 1 ppm at room temperature. A large sensor response and quick recovery time was observed at room temperature with preferred selectivity towards electron donor gases like CO and NH(3).

Item Type:	Article
Additional Information:	copyright for this article belongs to M/s Elsevier
Subjects:	Chemistry > Physical Chemistry Materials Science
Divisions:	UNSPECIFIED
Depositing User:	Users 27 not found.
Date Deposited:	19 Aug 2026 10:42
Last Modified:	19 Aug 2026 10:42
URI:	https://npl.csircentral.net/id/eprint/3345

Actions (login required)

View Item