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<p>A new synthetic strategy and associated mechanism have been developed, in which two carrier conduction channels of n- and p-type semiconductors on the surface of one material are automatically and advantageously selected during surface reactivity. The key step is to uniformly channel non-equilibrium metal oxides of CuO<sub>x</sub> and SnO<sub>x</sub> throughout the sample by applying a flame chemical vapour deposition technique for 5 s. Unlike the original SnO<sub>2</sub> semiconductor and Cu metal, the resulting material possessed intermediate physicochemical properties. It has been demonstrated that an oxidising gas, NO<sub>2</sub>, and reducing gas, H<sub>2</sub>S, can be alternately adsorbed, which was facilitated by the automatic selection of p- or n-type channels. This solid-solution sensing method utilizing non-equilibrium compositions can be employed in other applications involving semiconducting metal oxide gas sensing, even at low temperatures.</p><p></p>

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A synthetic method for preparing double channelling materials, and an operational mechanism for selective p- and n-type channels for gas sensing

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月6日

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  • Myung Sik Choi,
  • Han Gil Na,
  • Jeong Yun Hwang,
  • Seung Yong Lee,
  • Sanghyun Ji,
  • Jimyeong Park,
  • Sun-Woo Choi,
  • Kyu Hyoung Lee,
  • Changhyun Jin

摘要

A new synthetic strategy and associated mechanism have been developed, in which two carrier conduction channels of n- and p-type semiconductors on the surface of one material are automatically and advantageously selected during surface reactivity. The key step is to uniformly channel non-equilibrium metal oxides of CuOx and SnOx throughout the sample by applying a flame chemical vapour deposition technique for 5 s. Unlike the original SnO2 semiconductor and Cu metal, the resulting material possessed intermediate physicochemical properties. It has been demonstrated that an oxidising gas, NO2, and reducing gas, H2S, can be alternately adsorbed, which was facilitated by the automatic selection of p- or n-type channels. This solid-solution sensing method utilizing non-equilibrium compositions can be employed in other applications involving semiconducting metal oxide gas sensing, even at low temperatures.