ZnO decorated luminescent graphene as a potential gas sensor at room temperature

Gaurav Singh, Anshul Choudhary, D. Haranath, Amish G. Joshi, Nahar Singh, Sukhvir Singh, Renu Pasricha

Research output: Contribution to journalArticlepeer-review


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, NH3 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 NH3.

Original languageEnglish (US)
Pages (from-to)385-394
Number of pages10
Issue number2
StatePublished - Feb 2012

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science


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