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<p>Rational design of the morphology and defect structure of gas-sensing materials can significantly enhance the gas-sensing performance of Metal oxide semiconductor (MOS). In this work, three different morphologies of Zn<sub>2</sub>SnO<sub>4</sub> were successfully synthesized by adjusting the amount of LiOH. Systematic characterization reveals that increasing the LiOH concentration not only induced the morphological evolution of Zn<sub>2</sub>SnO<sub>4</sub>, but also effectively modulated its specific surface area (SSA) and oxygen-vacancy (O<sub>vac</sub>) concentration. The octahedral Zn<sub>2</sub>SnO<sub>4</sub> (ZSO-O) exhibits the largest SSA (149.62 m<sup>2</sup>·g<sup>−1</sup>), (111) crystal plane and the highest O<sub>vac</sub> concentration, thereby offering abundant active sites for gas adsorption and surface reactions. Consequently, the ZSO-O sensor exhibits the best performance in acetone detection, including the highest response value (100&#xa0;ppm: 30.7), fast response ability (1s), good selectivity and stability. The performance improvement is attributed to the synergistic interaction between its unique morphology and defects. This study presents a simple and effective strategy to achieve morphology-defect synergy in spinel Zn<sub>2</sub>SnO<sub>4</sub>, and highlights its potential as a high-performance acetone gas-sensing device for environmental monitoring.</p>

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High-performance octahedral Zn2SnO4 gas sensor for rapid acetone detection

  • 期刊论文

  • 发表日期：

    2025年12月3日

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  • Chunhui Sun,
  • Huaiyi Li,
  • Xiping Cheng,
  • Yitong Jiang

摘要

Rational design of the morphology and defect structure of gas-sensing materials can significantly enhance the gas-sensing performance of Metal oxide semiconductor (MOS). In this work, three different morphologies of Zn2SnO4 were successfully synthesized by adjusting the amount of LiOH. Systematic characterization reveals that increasing the LiOH concentration not only induced the morphological evolution of Zn2SnO4, but also effectively modulated its specific surface area (SSA) and oxygen-vacancy (Ovac) concentration. The octahedral Zn2SnO4 (ZSO-O) exhibits the largest SSA (149.62 m2·g−1), (111) crystal plane and the highest Ovac concentration, thereby offering abundant active sites for gas adsorption and surface reactions. Consequently, the ZSO-O sensor exhibits the best performance in acetone detection, including the highest response value (100 ppm: 30.7), fast response ability (1s), good selectivity and stability. The performance improvement is attributed to the synergistic interaction between its unique morphology and defects. This study presents a simple and effective strategy to achieve morphology-defect synergy in spinel Zn2SnO4, and highlights its potential as a high-performance acetone gas-sensing device for environmental monitoring.