4.6 Article

Highly improved toluene gas-sensing performance of mesoporous Co3O4 nanowires and physical mechanism

期刊

MATERIALS RESEARCH BULLETIN
卷 140, 期 -, 页码 -

出版社

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2021.111329

关键词

Co3O4 nanowires; Toluene gas; Surface area; Gas-sensing properties; Physical mechanism

资金

  1. National Natural Science Foundation of China [U1809216]
  2. Natural Science Foundation of Zhejiang Province [2017C33078]

向作者/读者索取更多资源

Mesoporous Co3O4 nanowires were synthesized using the nanocasting method and separated into dispersed and bundled nanowires. The microstructures and morphology significantly affect toluene gas sensing performance, with mesoporous structures exhibiting higher sensitivities and more stability. The gas-sensing mechanism involves surface oxygen and toluene gas adsorption, resulting in excellent performance in both samples.
Mesoporous Co3O4 nanowires were synthesized with the nanocasting method, and then the dispersed Co3O4 nanowires (Co3O4-DNWs) were separated from the bundled Co3O4 nanowires (Co3O4-BNWs) by the centrifugation technique. From the characterization with TEM, X-ray diffraction, UV-vis spectra and nitrogen adsorption-desorption isotherm, both samples present the same mesoporous-structure, diameter and the similar defects due to the same synthesis conditions. All results indicate that the microstructures and morphology of Co3O4 nanowires greatly affect the toluene gas sensing performance. Owing to the mesoporous-structures with the high surface area, the sensitivities of both samples are higher than others'. Co3O4-DNWs exhibit the higher specific surface area (44.98 m(2) g(-1)) than Co3O4-BNWs, leading to the excellent gas-sensing properties to toluene gas at the optimized operating temperature of 210 degrees C. Moreover, both samples present the excellent stability and selectivity to toluene gas. The gas-sensing mechanism results from the surface oxygen and toluene gas adsorption through comparing the sensitivity of Co3O4-DNWs and Co3O4-BNWs.

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