Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (7): 946-955.DOI: 10.6023/A22020093 Previous Articles     Next Articles

Article

基于ZIF-8/PAN复合薄膜的柔性丙酮气体传感器

牛犇a,b, 翟振宇a,b, 郝肖柯a,b, 任婷莉a,b, 李从举a,b,*()   

  1. a 北京市高校节能与环保工程研究中心 北京 100083
    b 北京科技大学能源与环境工程学院 北京 100083
  • 投稿日期:2022-02-27 发布日期:2022-05-05
  • 通讯作者: 李从举
  • 基金资助:
    国家自然科学基金(51973015); 国家自然科学基金(52170019); 中央高校基本科研业务费专项资金(06500100)

Flexible Acetone Gas Sensor based on ZIF-8/Polyacrylonitrile (PAN) Composite Film

Ben Niua,b, Zhenyu Zhaia,b, Xiaoke Haoa,b, Tingli Rena,b, Congju Lia,b()   

  1. a Beijing University Energy Conservation and Environmental Protection Engineering Research Center, Beijing 100083
    b School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083
  • Received:2022-02-27 Published:2022-05-05
  • Contact: Congju Li
  • Supported by:
    National Natural Science Foundation of China(51973015); National Natural Science Foundation of China(52170019); Fundamental Research Funds for the Central Universities(06500100)

ZIF-8 is a Zn-based metal organic framework material which can adsorb acetone gas, so it can be used as the gas sensing material of capacitive acetone sensor. In addition, it can be combined with electrospinning nanofibers to form a fibrous gas sensitive material, so that the acetone sensor using it as the gas sensing material has excellent flexibility and this kind of excellent flexibility cannot be achieved in the research of flexible acetone sensor at present. In this work, ZIF-8/ polyacrylonitrile (PAN) nanofiber membrane composite with excellent flexibility was prepared by seed embedding method and secondary growth method. The key to the material preparation process is to prepare 2-methylimidazol/PAN composite membrane firstly by blended electrospinning and use the 2-methylimidazole embedded in the nanofiber membrane as the site for the growth of ZIF-8 on the surface of the nanofiber membrane. Then the metal salts and ligands needed for the growth of ZIF-8 were provided by the secondary growth method in stages and finally the fibrous gas sensitive material ZIF-8/PAN could be obtained. After that, a capacitive acetone sensor using flexible ZIF-8/PAN composite material as flexible gas sensing layer and carbon nanotubes as flexible electrode was prepared. The sensor has excellent flexibility, high porosity and fully exposed active site. Due to these characteristics, the sensor has a sensitive response to acetone gas in the range of 250~2000 cm3/m3, and the response shows good linearity (R2=0.99659). In addition, the sensor has good cyclic response, long-term stability, and shows good selectivity for acetone among nine common volatile organic compounds. It is worth noting that due to the excellent flexibility of the fibrous gas sensitive layer ZIF-8/PAN, the response value of the sensor to acetone gas under 180° bending state is almost the same as that to acetone under 0° unbending state, and the sensor also shows a stable response to acetone after 180° bending-recovery within 200 times. Besides these excellent performances in flexibility, the use temperature of the sensor is room temperature. These characteristics make it have the development potential to combine with clothing to form a portable flexible acetone sensor.

Key words: metal-organic framework, nanofiber, volatile organic compounds (VOCs) gas sensor, capacitance, flexibility, seed embedding method