CeO2/TiO2 core/shell nanoparticles as quantitative gas sensor at room temperature
ISSN: 0260-2288
Article publication date: 19 February 2018
Issue publication date: 3 July 2018
Abstract
Purpose
This paper aims to introduce constructed CeO2/TiO2 core/shell nanoparticle as sensitive substance organic compounds.
Design/methodology/approach
The CeO2 nanoparticles were synthesized by hydrothermal treatment. Then CeO2/TiO2 core/shell was fabricated by sol–gel method preparation of TiO2 in the presence of ceria nanoparticles and applied as the sensitive material to make a sensor.
Findings
Formation of the nanoparticles was confirmed by X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM). The synthesized sensor exhibited not only good sensitivity to volatile organic compounds at room temperature but also logarithm of sensitivity versus concentrations was linear.
Research limitations/implications
The sensor shows acceptable sensitivity to volatile organic compound at room temperature.
Practical implications
Experimental data revealed satisfactory reproducibility and short response and recovery times.
Originality/value
A radical mechanism for gas sensor reaction in two pathways was considered and activation energies were calculated by density functional theory (DFT) method to describe different sensitivities of tested volatile gases. The experimental results were consistent with the calculations.
Keywords
Acknowledgements
The authors are grateful to the Laboratory Complex of Yadegar-e-Imam Khomeini (RAH) Shahr-e-Rey Branch, Islamic Azad University for valuable technical assistance.
Citation
Samadi, S., Asadi Cordshooli, G., Yousefi, M., Kalateh, K. and Zakaria, S. (2018), "CeO2/TiO2 core/shell nanoparticles as quantitative gas sensor at room temperature", Sensor Review, Vol. 38 No. 4, pp. 458-466. https://doi.org/10.1108/SR-05-2017-0093
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited