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Lecture

WEB High response and low concentration hydrogen gas sensing properties using hollow ZnO particles transformed from polystyrene@ZnO core-shell structures

Friday (25.09.2020)
10:10 - 10:25 Z: Special Symposia I
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The environmental monitoring is one of the key issues that have to be addressed in present developing world scenario. The detection of various gases (toxic or explosive) in the atmosphere has become the primary need in order to avoid any unpleasant accidents. The researchers are exclusively working on hydrogen generation and storage for clean abundant future source of energy. Hydrogen (H2) gas has wide explosive concentration range (4-75 vol%), low ignition energy (0.02 mJ) and large flame propagation velocity. Human senses cannot detect H2 due its colorless & odorless properties. There is requirement to develop high performance and low concentration detection hydrogen gas sensors.

High quality, closely packed ZnO nanorods textured micro particles were prepared via thermal treatment of polystyrene@ZnO core-shell structures at 300 °C. These nano-micro structured ZnO were investigated for gas sensing properties. The nanorods texturing (diameter ~ 70 - 80 nm and height ~ 300 nm) on micro size (diameter ~ 9 nm) ZnO particles were done by introducing seed structures. The morphology was confirmed by field emission scanning electron microscope (FE-SEM) and transmission electron microscope (TEM). The structural parameters and elemental compositions have estimated by x-ray diffraction (XRD) and energy dispersive spectrometer (EDS) respectively. Nano-micro ZnO structure have remarkable selectivity towards hydrogen (H2) gas. The lowest H2 detection of 2 ppm concentration was noted with response 7%, whereas gas response 89% was recorded for 100 ppm at 225 ˚C optimized temperature with response time 139 s. The sensor has studied at different operating temperature and gas concentration along with sensor stability. The performance of present sensor was compared with reported data and found to be improved.

Keywords: Gas sensor; Hydrogen; hollow microspheres; ZnO Nanorods; High response

Speaker:
Dr. Umesh T. Nakate
Jeonbuk National University
Additional Authors:
  • Prof. Yoon-Bong Hahn
    Jeonbuk National University

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