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<p>Gas sensors play a critical role in ensuring safety, environmental monitoring, and industrial process control. In this study, carbon nanostructures synthesized from onion waste were employed to develop free-standing Carbon/TiO<sub>2</sub> thin films through a hydrothermal method, offering an eco-friendly approach for advanced sensing applications. Grown free-standing Carbon/TiO<sub>2</sub> composite film exhibits a unique morphology, featuring tube-like carbon structures decorated with broccoli-flower-shaped TiO<sub>2</sub> formations, with an average flower diameter of 8 ± 0.2&#xa0;µm. A chemiresistive sensor fabricated from carbon/TiO<sub>2</sub> composite shows a high response of 339% at 100&#xa0;ppm NO<sub>2</sub> compared to pure TiO<sub>2</sub> nanostructures, highlighting its superior gas-sensing performance. In addition, the formation of a free-standing Carbon/TiO<sub>2</sub> composite simplifies the fabrication process of the chemiresistive gas sensor, offering a cost-effective and scalable approach for sensor development.</p>

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Synthesis of free-standing carbon/TiO2 thin-film-based chemiresistive sensor for NO2 sensing

  • 期刊论文

  • 发表日期：

    2026年1月9日

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  • Anita R. Patel,
  • Pruthvi Patel,
  • Dharti Patel,
  • Vishwa Padia,
  • A. K. Dasadia,
  • R. P. Khatri,
  • D. K. Dhruv,
  • Mitesh H. Patel,
  • Shikha Varma,
  • Vanaraj Solanki

摘要

Gas sensors play a critical role in ensuring safety, environmental monitoring, and industrial process control. In this study, carbon nanostructures synthesized from onion waste were employed to develop free-standing Carbon/TiO2 thin films through a hydrothermal method, offering an eco-friendly approach for advanced sensing applications. Grown free-standing Carbon/TiO2 composite film exhibits a unique morphology, featuring tube-like carbon structures decorated with broccoli-flower-shaped TiO2 formations, with an average flower diameter of 8 ± 0.2 µm. A chemiresistive sensor fabricated from carbon/TiO2 composite shows a high response of 339% at 100 ppm NO2 compared to pure TiO2 nanostructures, highlighting its superior gas-sensing performance. In addition, the formation of a free-standing Carbon/TiO2 composite simplifies the fabrication process of the chemiresistive gas sensor, offering a cost-effective and scalable approach for sensor development.