Formic Acid Gas Sensors Based on Electrolytically Exfoliated Graphene-loaded Flame-Made Spinel Zn2SnO4 Composites

Wiphawee Jiamjai, Kanittha Inyawilert, Matawee Punginsang, Mameaseng Siriwalai, Anurat Wisitsoraat and Chaikarn Liewhiran
* Author for corresponding; e-mail address: cliewhiran@gmail.com
Volume: Vol.50 No.6 (November 2023)
Research Article
DOI: https://doi.org/10.12982/CMJS.2023.068
Received: 12 September 2023, Revised: 11 October 2023, Accepted: 11 October 2023, Published: -

Citation: Jiamjai W., Inyawilert K., Punginsang M., Siriwalai M., Wisitsoraat A. and Liewhiran C., Formic Acid Gas Sensors Based on Electrolytically Exfoliated Graphene-loaded Flame-Made Spinel Zn2SnO4 Composites, Chiang Mai Journal of Science, 2023; 50(6): e2023068. DOI 10.12982/CMJS.2023.068.

Abstract

In this work, effective gas-sensing material were prepared by combining spinel zinc stannate (Zn₂SnO₄) nanoparticles synthesized by flame spray pyrolysis and graphene produced by the electrolytic exfoliation for volatile organic acids (VOAs) detection. The effect of graphene content in the range of 0.2–5 wt% on formic acid (HCOOH)-sensing performance of Zn₂SnO₄ nanoparticles was evaluated. Structural, physical, and chemical properties were investigated using X-ray diffraction, Raman spectroscopy, BET-surface analysis, energy dispersive X-ray spectroscopy, and electron microscopy. From the gas-sensing test towards 0.005-0.1 vol% HCOOH in dry air at 200-400°C, the graphene-loaded Zn₂SnO₄ sensor with the optimal graphene content of 0.5 wt% displayed the highest response of ~4970 towards HCOOH at the optimal temperature of 300°C. Moreover, it showed high HCOOH selectivity against several other VOAs, volatile organic compounds, and environmental gases. Therefore, graphene-loaded spinel Zn₂SnO₄ sensors could be attractive choices for selective HCOOH detection and useful for food science and industrial applications.

Keywords: Zn2SnO4 nanoparticles, graphene, HCOOH, flame spray pyrolysis, electrolytic exfoliation

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