Chemical Research in Chinese Universities ›› 2019, Vol. 35 ›› Issue (5): 755-761.doi: 10.1007/s40242-019-9125-2

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Preparation and Gas Sensing Performance of Hierarchical Porous ZnO-based Materials with Sunflower Rods as a Biological Template

WANG Bowei1, ZENG Qingrui2, CHEN Shu1, YUE Tongtong2, HAN Bing1, FENG Wei2, YANG Defeng1   

  1. 1. Second Hospital of Jilin University, Changchun 130021, P. R. China;
    2. Key Laboratory of Groundwater Resource and Environment, Ministry of Education, College of Environment and Resources, Jilin University, Changchun 130021, P. R. China
  • Received:2019-04-28 Online:2019-10-01 Published:2019-09-24
  • Contact: YANG Defeng E-mail:wf0104019@163.com
  • Supported by:
    Supported by the Key Technology Research and Development Project of Jilin Province, China(No.20180201056YY) and the Medical Health Project of Jilin Province, China(No.20190304032YY).

Abstract: A graded porous structure SnO2/ZnO composite was prepared with sunflower rods as a biological template. The prepared samples were subjected to phase analysis by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffractiometry(XRD) and X-ray photoelectron spectroscopy(XPS). ZnO sample was a pure phase of hexagonal wurtzite, and the template had been completely removed. The surface of the sample presented a honeycomb-like structure of a sunflower rod template, which was formed by interconnecting the porous channels, and had a smaller average size and exhibited n-n heterojunction at the n-type ZnO interface. Compared with that of pure ZnO, the response of the hierarchical porous structure SnO2/ZnO composite to 100 mg/L n-butanol reached a maximum of 40.61 at 240℃, about 2.7 times higher than that of pure ZnO. Its response time and recovery time are 6 and 3 s, respectively, which are also better than those of pure ZnO. SnO2/ZnO composite exhibits good gas selectivity, which is related to the improvement of the structure and the forming of n-n heterojunctions of the material.

Key words: Sunflower stem, SnO2/ZnO, Graded porous structure, Gas sensitivity, n-Butanol