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<p>In the present study, a series of carbon coated MoO<sub>3</sub>-SnO<sub>2</sub> nanocomposites were prepared via the cost effective sol–gel process for the detection of volatile organic compounds. The properties were studied using various characterization techniques. XRD revealed crystalline size varying between 25 and 60&#xa0;nm, while HRTEM analysis indicated the formation of a nanocomposite. SEM reflected the porous, agglomerated, spherical-like nanoparticles. FTIR identified composite framework with wavenumbers of 965&#xa0;cm<sup>−1</sup> assigned to polymolybdate on the surface of SnO<sub>2</sub>. The band gap energy varied between 2.68 and 2.88&#xa0;eV determine using UV-DRS. The elemental content and oxidation state of Mo and Sn were investigated using XPS analysis. The BET method revealed a specific surface area of 31.83 m<sup>2</sup>g<sup>−1</sup> and an average pore size of 16.41&#xa0;nm. Among the series of samples, the 5% carbon coated MoO<sub>3</sub>-SnO<sub>2</sub> nanocomposite demonstrated a remarkable sensing response towards acetone vapors at room temperature as compared to toluene, n-butanol, methanol, and ethanol. It exhibited high sensing response (2.85) towards 100&#xa0;ppm acetone vapor concentration, nearly 2.2 and 2.3 times higher than that of pure SnO<sub>2</sub> and MoO<sub>3</sub>. Additionally, it exhibits a rapid response time of 37&#xa0;s, recovers within 31&#xa0;s, and demonstrates repeatability for up to nine cycles. Our present work gives a newly developed gas sensor with high response, good selectivity, and reproducibility, contributing significantly to the monitoring of environmental air pollution.</p>

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Carbon coated MoO3-SnO2 nanocomposite based gas sensing room temperature activity for acetone

  • 期刊论文

  • 发表日期：

    2025年8月21日

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  • Akash Nagare,
  • Amol Dhadage,
  • Pravin Ghare,
  • Ramesh Naval,
  • Anil Athare,
  • Parikshit Gogoi,
  • Madhukar Navgire

摘要

In the present study, a series of carbon coated MoO3-SnO2 nanocomposites were prepared via the cost effective sol–gel process for the detection of volatile organic compounds. The properties were studied using various characterization techniques. XRD revealed crystalline size varying between 25 and 60 nm, while HRTEM analysis indicated the formation of a nanocomposite. SEM reflected the porous, agglomerated, spherical-like nanoparticles. FTIR identified composite framework with wavenumbers of 965 cm−1 assigned to polymolybdate on the surface of SnO2. The band gap energy varied between 2.68 and 2.88 eV determine using UV-DRS. The elemental content and oxidation state of Mo and Sn were investigated using XPS analysis. The BET method revealed a specific surface area of 31.83 m2g−1 and an average pore size of 16.41 nm. Among the series of samples, the 5% carbon coated MoO3-SnO2 nanocomposite demonstrated a remarkable sensing response towards acetone vapors at room temperature as compared to toluene, n-butanol, methanol, and ethanol. It exhibited high sensing response (2.85) towards 100 ppm acetone vapor concentration, nearly 2.2 and 2.3 times higher than that of pure SnO2 and MoO3. Additionally, it exhibits a rapid response time of 37 s, recovers within 31 s, and demonstrates repeatability for up to nine cycles. Our present work gives a newly developed gas sensor with high response, good selectivity, and reproducibility, contributing significantly to the monitoring of environmental air pollution.