Scholarlink

<p>Gas sensors capable of detecting trace‐level gas concentrations are vital for applications spanning medical diagnostics, industrial safety, and environmental monitoring. Among emerging technologies, thin-film transistor (TFT)-based gas sensors have gained prominence due to their intrinsic sensitivity, low power consumption, and compatibility with miniaturized and flexible electronic systems. In a TFT gas sensor, device operation is governed by the semiconductor channel, whose conductivity is modulated by an applied gate voltage that precisely controls charge transport. Gas sensing arises from changes in the electrical properties of this semiconductor when exposed to target gas molecules. Several mechanisms underpin this sensing behavior, including adsorption and desorption of gas species on the semiconductor surface, which modifies charge carrier density; variations in bulk resistance within the active layer; and gas diffusion into the sensing film, which dictates response and recovery dynamics. Traditionally, TFT gas sensors have relied on metal oxide semiconductors, where surface reactions between gas molecules and adsorbed oxygen species lead to measurable resistance changes. While effective, these systems often face limitations related to operating temperature and flexibility. Recently, two-dimensional MXene materials have emerged as promising alternatives and complements to metal oxides in TFT architectures. MXene offer exceptional electronic properties, large specific surface areas, and chemically tunable surface terminations, enabling strong interactions with gas molecules. When integrated with metal oxide TFTs, MXene can function both as active semiconducting channels and as highly sensitive gas-responsive interfaces. This review highlights recent advances in MXene–metal oxide composite TFT gas sensors, emphasizing their synergistic benefits. By combining the high conductivity and surface reactivity of MXene with the established gas sensitivity of metal oxides, these hybrid systems demonstrate enhanced sensitivity, faster response, mechanical flexibility, and scalability, paving the way for next-generation high-performance gas-sensing platforms.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Review: advances in the engineering of MXene-metal oxide-based composite thin-film transistor for gas sensors

  • 期刊论文

  • 发表日期：

    2026年7月21日

查看全文
  • Komal,
  • Mukesh Kumar,
  • Jamilur R. Ansari

摘要

Gas sensors capable of detecting trace‐level gas concentrations are vital for applications spanning medical diagnostics, industrial safety, and environmental monitoring. Among emerging technologies, thin-film transistor (TFT)-based gas sensors have gained prominence due to their intrinsic sensitivity, low power consumption, and compatibility with miniaturized and flexible electronic systems. In a TFT gas sensor, device operation is governed by the semiconductor channel, whose conductivity is modulated by an applied gate voltage that precisely controls charge transport. Gas sensing arises from changes in the electrical properties of this semiconductor when exposed to target gas molecules. Several mechanisms underpin this sensing behavior, including adsorption and desorption of gas species on the semiconductor surface, which modifies charge carrier density; variations in bulk resistance within the active layer; and gas diffusion into the sensing film, which dictates response and recovery dynamics. Traditionally, TFT gas sensors have relied on metal oxide semiconductors, where surface reactions between gas molecules and adsorbed oxygen species lead to measurable resistance changes. While effective, these systems often face limitations related to operating temperature and flexibility. Recently, two-dimensional MXene materials have emerged as promising alternatives and complements to metal oxides in TFT architectures. MXene offer exceptional electronic properties, large specific surface areas, and chemically tunable surface terminations, enabling strong interactions with gas molecules. When integrated with metal oxide TFTs, MXene can function both as active semiconducting channels and as highly sensitive gas-responsive interfaces. This review highlights recent advances in MXene–metal oxide composite TFT gas sensors, emphasizing their synergistic benefits. By combining the high conductivity and surface reactivity of MXene with the established gas sensitivity of metal oxides, these hybrid systems demonstrate enhanced sensitivity, faster response, mechanical flexibility, and scalability, paving the way for next-generation high-performance gas-sensing platforms.