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基于金屬有機骨架材料的電阻傳感器在檢測VOCs中的應用

Application of chemiresistive sensors based on the metal-organic framework for detecting volatile organic compounds

  • 摘要: 化學電阻傳感器由于其結構簡單、分析快速等特點在眾多氣體傳感方式中脫穎而出,因此成為了目前應用廣泛的傳感器類型。其中,用于檢測揮發性有機化合物(VOCs)的電阻傳感器中敏感材料對氣體的選擇性吸附和相應的檢測至關重要,此外也需要一些額外措施保證檢測的選擇性。因此,傳感材料的比表面積、孔尺寸、功能官能團以及輔助材料等決定了傳感器的響應程度、選擇和敏感程度。金屬有機框架材料(MOF)是一類新型的有機?無機雜化材料,具有豐富多孔、高比表面積、結構多樣性、化學穩定性良好等特點,除此以外一些MOF衍生物也具有比表面積大、導電性良好等特點,因此MOF及MOF衍生物已在氣體傳感器中得到廣泛研究和應用。基于化學電阻傳感器基本原理、MOF及MOF衍生物在電阻傳感器檢測揮發性有機化合物中起到的作用、原理、及其應用,對其發展前景和面臨的挑戰進行了展望。

     

    Abstract: Chemical resistance sensors stand out among many gas sensing methods because of their simple structure, low-cost fabrication, facile integration with various electronic devices, and quick analysis; therefore, presently, they are widely used for gas sensing. Chemical resistance sensing is achieved by changing the electronic distribution of the sensing material. Among these chemical resistance sensors, the selective adsorption of gases and the corresponding detection of sensitive materials in the resistance sensor used for detecting volatile organic compounds (VOCs) are very important. In addition, measures to ensure the selectivity of detection are necessary. Therefore, the specific surface area, pore size and functional groups of sensing materials, and some auxiliary materials determine the response and sensitivity of the sensor. Metal-organic framework materials (MOFs) are a new class of organic-inorganic hybrid materials. It is characterized by rich porosity, high specific surface area, structural diversity, and chemical stability, making it exhibit good potential in the gas storage and separation field, catalysis field, and chemical sensing field. Some MOF derivatives, in addition to their properties, such as good electrical conductivity, have characteristics of MOF, such as high specific surface area. Therefore, MOF and its derivatives have been widely studied and applied as sensitive materials and filter media in gas sensors. Some MOF and MOF derivatives can be used as sensitive materials for chemical resistance sensors to improve the response to VOCs, and MOF membranes can also be used for their selective adsorption as a filter layer to improve the selectivity of sensors to the target gas. In this paper, the basic principle of chemical resistance sensors, the role, principle, and application of MOF and MOF derivatives in the detection of volatile organic compounds by resistance sensors are summarized, and the development prospect and challenges are discussed.

     

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