ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Nickel oxide (NiO) nanoflakes prepared through hydrothermal method and integration into acetone gas sensing application

Reyaz Ahmad and M. A. Shah

Special Laboratory for Multifunctional Nanomaterials (LMN), P. G. Department of Physics, National Institute of Technology Srinagar, Srinagar, India

E-mail: shah@nitsri.net

Received: 20 April 2022  Accepted: 23 August 2022

Abstract:

Herein, we introduce the fabrication of nickel oxide (NiO) nanostructures through hydrothermal method for acetone gas-sensing application. The FESEM study reveals the flake like morphology, consisting of large numbers of nanosheets interconnected to each other with the average length and thickness ~ 40 nm and ~ 680 nm, respectively. The fabricated nanoflakes show the maximum red shift with maximum decrease in band gap of 3.3 eV. The gas sensing response of NiO nanoflakes were found to be 28.9%, 80%, and 148% towards 20, 30, and 20 ppm acetone concentration, respectively. The response of different gasses such acetone, 2 propanol, toluene, ammonia, methanol, ethanol at gas concentration of 20 ppm was noted at room temperature and our sensor was found more selective towards acetone gas. Furthermore, the sensor response and the gas concentration show good linear relationship from 20 to 50 ppm. These results suggests that the synthesized nanoflakes could be used to make high performance gas sensor for low concentration acetone detection.

Keywords: Nickel oxide; Nanosheets; FESEM; Gas sensor

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-022-02448-x

Chemical Papers 77 (1) 413–421 (2023)