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Improving TiO2 gas sensing selectivity to acetone and other gases via a molecular imprinting method

机译：通过分子印迹方法改善TiO2气体对丙酮和其他气体的选择性

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摘要

Various gas sensors have made considerable improvements to the quality of people's lives. However, in most cases, changing of materials is necessary to adapt to the changing of the target gas, which limits the further application of gas sensors. To meet this challenge, in this work, molecular imprinting (MI) technology is introduced. Acrylic acid is used as a functional monomer, while gas molecules, including acetone, are used as templates. The MI process with an acetone template helps improve the acetone selectivity of TiO2 by up to 1.74-2.80 times. Moreover, it proved that other templates can increase the corresponding selectivity by at least 1.5 times by using the same matrix material. These results demonstrate the potential importance of the MI process in constructing a highly compatible gas sensor industry. Beyond this, the MI process has proved to achieve an ultrahigh specific surface area of 384.36 m(2) g(-1). The optimal acetone sensor exhibits desirable comprehensive performance compared with other reports. An excellent TiO2 based prototype acetone sensor working at 300 degrees C with a low detection limit of 18 ppb is obtained.
机译：各种气体传感器已经大大改善了人们的生活质量。然而，在大多数情况下，需要改变材料以适应目标气体的变化，这限制了气体传感器的进一步应用。为了应对这一挑战，本文引入了分子印迹技术。丙烯酸用作功能单体，而包括丙酮在内的气体分子用作模板。采用丙酮模板的MI工艺有助于将TiO2的丙酮选择性提高1.74-2.80倍。此外，还证明了使用相同的基质材料，其他模板可以将相应的选择性提高至少1.5倍。这些结果表明了MI工艺在构建高度兼容的气体传感器行业中的潜在重要性。除此之外，MI工艺已被证明可获得384.36 m（2）g（-1）的超高比表面积。与其他报道相比，最佳丙酮传感器具有理想的综合性能。获得了一种性能优良的基于TiO2的丙酮原型传感器，其工作温度为300℃，检测下限为18 ppb。

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  • 来源
    《Nanotechnology》 |2021年第15期|共13页
  • 作者

    Yang Wangyang; Shen Honglie; Ge Jiawei; Xu Binbin;

  • 作者单位

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Peoples R China;

    Nanjing Univ Aeronaut &

    Astronaut Coll Mat Sci &

    Technol Jiangsu Key Lab Mat &

    Technol Energy Convers Nanjing 210016 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 特种结构材料;
  • 关键词

    molecular imprinting technology; acetone sensor; selectivity; specific surface area;

    机译：分子印迹技术;丙酮传感器;选择性;比表面积;

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