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<p>Flexible room temperature (RT) NH<sub>3</sub> sensors with good mechanical stability and high responsiveness are anticipated for practical applications. Herein, Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/In<sub>2</sub>O<sub>3</sub> heterojunction nanocomposites with different Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> mass ratios (20 wt%, 40 wt%, and 80 wt%) were constructed by the chemical precipitation method. At RT (25&#xa0;°C), the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/In<sub>2</sub>O<sub>3</sub> flexible sensor (40 wt% Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) exhibited the highest response compared to the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> nanosheet flexible sensor and In<sub>2</sub>O<sub>3</sub> nanoparticle (NP) flexible sensor. The response of the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/In<sub>2</sub>O<sub>3</sub> flexible sensor to 100 ppm NH<sub>3</sub> (146.24%) is 83 times higher than that of the pure Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> nanosheet flexible sensor (1.77%). Most importantly, the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/In<sub>2</sub>O<sub>3</sub> flexible sensor maintained a stable sensitive response to 100 ppm NH<sub>3</sub> under extreme bending conditions (up to 150° and 3200 cycles). In addition, the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/In<sub>2</sub>O<sub>3</sub> flexible sensor showed good selectivity, repeatability, and stability. The good sensitivity of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/In<sub>2</sub>O<sub>3</sub> nanocomposites can be attributed to the formation of p–n heterojunctions between the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> nanosheets and In<sub>2</sub>O<sub>3</sub> NPs, the increased adsorption of oxygen within the composites, and the widened spacing of the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> layers for NH<sub>3</sub> diffusion and penetration. These findings underscore the promising potential of Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>/In<sub>2</sub>O<sub>3</sub> heterojunction nanocomposites for advanced applications in flexible RT NH<sub>3</sub> sensing.</p>

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Ti3C2Tx/In2O3 heterojunction nanocomposite-based flexible sensor for selective detection of NH3 at room temperature

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Jinniu Zhang,
  • Shuangyan Wang,
  • Ruyi Yang,
  • Jia Liu,
  • Xinyi Zhang,
  • Wenguang Yu,
  • Tong Xu,
  • Jiawei Guo,
  • Xinlei Zhang,
  • Jianzhi Gao,
  • Hongbing Lu

摘要

Flexible room temperature (RT) NH3 sensors with good mechanical stability and high responsiveness are anticipated for practical applications. Herein, Ti3C2Tx/In2O3 heterojunction nanocomposites with different Ti3C2Tx mass ratios (20 wt%, 40 wt%, and 80 wt%) were constructed by the chemical precipitation method. At RT (25 °C), the Ti3C2Tx/In2O3 flexible sensor (40 wt% Ti3C2Tx) exhibited the highest response compared to the Ti3C2Tx nanosheet flexible sensor and In2O3 nanoparticle (NP) flexible sensor. The response of the Ti3C2Tx/In2O3 flexible sensor to 100 ppm NH3 (146.24%) is 83 times higher than that of the pure Ti3C2Tx nanosheet flexible sensor (1.77%). Most importantly, the Ti3C2Tx/In2O3 flexible sensor maintained a stable sensitive response to 100 ppm NH3 under extreme bending conditions (up to 150° and 3200 cycles). In addition, the Ti3C2Tx/In2O3 flexible sensor showed good selectivity, repeatability, and stability. The good sensitivity of Ti3C2Tx/In2O3 nanocomposites can be attributed to the formation of p–n heterojunctions between the Ti3C2Tx nanosheets and In2O3 NPs, the increased adsorption of oxygen within the composites, and the widened spacing of the Ti3C2Tx layers for NH3 diffusion and penetration. These findings underscore the promising potential of Ti3C2Tx/In2O3 heterojunction nanocomposites for advanced applications in flexible RT NH3 sensing.