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<p>MXenes are emerging candidates in various fields especially as gas sensors and have received widespread attention. In this manuscript, the gas sensor based on MXene Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>-ZnSnO<sub>3</sub> was applied for H<sub>2</sub>S sensing. MXene Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> was synthesized from Ti<sub>3</sub>AlC<sub>2</sub> MAX by a direct etching of HF, while other products such as pure ZnSnO<sub>3</sub> and nano-composites were synthesized hydrothermally. Various characterizations were studied to analyse the intrinsic properties of the synthesized materials. Different gas sensors were fabricated from products. The gas sensor of TC-ZSO-6 (6 wt% MXene Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub>) demonstrated the highest response of 9.2–2 ppm H<sub>2</sub>S and minimum detection limit (100 ppb) compared with ZnSnO<sub>3</sub> (a response of 4.2–2 ppm and the detection limit was 200 ppb), respectively. Meanwhile, the gas sensor of TC-ZSO-6 displayed short response/times (74&#xa0;s/12 s), outstanding stability and selectivity as well as remarkable reproducibility. The enhancement was related to some factors such as the synergistic effect, the formation of p-n heterojunctions and the highest BET surface area. This work based on TC-ZSO-6 could be a new pathway for detecting H<sub>2</sub>S to the lowest level at 210&#xa0;°C.</p> Graphical Abstract <p></p>

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Highly Stable and Sensitive H2S Gas Sensor Based on Nano-composite of MXenes Ti3C2Tx-ZnSnO3

  • 期刊论文

  • 发表日期：

    2025年6月7日

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  • Shama Sadaf,
  • Lifu Liu,
  • Rujun Zhou,
  • Ali Akhtar,
  • Daru Chen

摘要

MXenes are emerging candidates in various fields especially as gas sensors and have received widespread attention. In this manuscript, the gas sensor based on MXene Ti3C2Tx-ZnSnO3 was applied for H2S sensing. MXene Ti3C2Tx was synthesized from Ti3AlC2 MAX by a direct etching of HF, while other products such as pure ZnSnO3 and nano-composites were synthesized hydrothermally. Various characterizations were studied to analyse the intrinsic properties of the synthesized materials. Different gas sensors were fabricated from products. The gas sensor of TC-ZSO-6 (6 wt% MXene Ti3C2Tx) demonstrated the highest response of 9.2–2 ppm H2S and minimum detection limit (100 ppb) compared with ZnSnO3 (a response of 4.2–2 ppm and the detection limit was 200 ppb), respectively. Meanwhile, the gas sensor of TC-ZSO-6 displayed short response/times (74 s/12 s), outstanding stability and selectivity as well as remarkable reproducibility. The enhancement was related to some factors such as the synergistic effect, the formation of p-n heterojunctions and the highest BET surface area. This work based on TC-ZSO-6 could be a new pathway for detecting H2S to the lowest level at 210 °C.

Graphical Abstract