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 journalArticle


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 1 2012


ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)

Cite this

Singh, G., Choudhary, A., Haranath, D., Joshi, A. G., Singh, N., Singh, S., & Pasricha, R. (2012). ZnO decorated luminescent graphene as a potential gas sensor at room temperature. Carbon, 50(2), 385-394. https://doi.org/10.1016/j.carbon.2011.08.050