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<p>A simple hydrothermal approach was used to produce Cr-doped SnO<sub>2</sub> (Cr–SnO<sub>2</sub>) nanoparticles and methane (CH<sub>4</sub>) gas sensing characteristics were explored. The characterization findings demonstrate that the size of the Cr–SnO<sub>2</sub> nanoparticle is in the range of 30–45&#xa0;nm. The presence of O–Sn–O bond is confirmed by FTIR. The surface area and pore size distribution were analyzed by BET surface analysis. Tetragonal rutile structure was identified in XRD analysis for both pristine and Cr-doped SnO<sub>2</sub> nanoparticles. The existence of the elements Sn, O and Cr is confirmed by XPS. The findings of the sensing test show that the SnO<sub>2</sub> doped with 1% Cr shows a 1.5-fold increase in sensitivity to 50&#xa0;ppm methane and an improved responsiveness and good selectivity to methane. Notably, Excellent stability, reproducibility, selectivity are maintained in environments with changing humidity, suggesting that Cr–SnO<sub>2</sub> sensor is a promising candidate for methane recognition. The enhanced gas sensing mechanism for Cr–SnO<sub>2</sub> nanoparticles was also discussed.</p>

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Preparation of Cr-modified SnO2 nanoparticles through hydrothermal method for enhanced methane sensing performance

  • 期刊论文

  • 发表日期：

    2025年5月31日

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  • Jayaprakash Jeyaram,
  • A. Vengadesan,
  • C. Parthasaradhi Reddy,
  • T. Sivasakthi,
  • Vasudeva Reddy Minnam Reddy,
  • Woo Kyoung Kim,
  • Mohamed A. Habila

摘要

A simple hydrothermal approach was used to produce Cr-doped SnO2 (Cr–SnO2) nanoparticles and methane (CH4) gas sensing characteristics were explored. The characterization findings demonstrate that the size of the Cr–SnO2 nanoparticle is in the range of 30–45 nm. The presence of O–Sn–O bond is confirmed by FTIR. The surface area and pore size distribution were analyzed by BET surface analysis. Tetragonal rutile structure was identified in XRD analysis for both pristine and Cr-doped SnO2 nanoparticles. The existence of the elements Sn, O and Cr is confirmed by XPS. The findings of the sensing test show that the SnO2 doped with 1% Cr shows a 1.5-fold increase in sensitivity to 50 ppm methane and an improved responsiveness and good selectivity to methane. Notably, Excellent stability, reproducibility, selectivity are maintained in environments with changing humidity, suggesting that Cr–SnO2 sensor is a promising candidate for methane recognition. The enhanced gas sensing mechanism for Cr–SnO2 nanoparticles was also discussed.