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

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.