4.7 Article

Nanorods-assembled ZnO microflower as a powerful channel for n-butanol sensing

期刊

JOURNAL OF ALLOYS AND COMPOUNDS
卷 860, 期 -, 页码 -

出版社

ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.158410

关键词

Assembly; Nanorods; ZnO microflower; Gas sensor; N-butanol

资金

  1. National Natural Science Foundation of China [61603279]
  2. open fund of Hubei Key Lab of Mechanical Transmission and Manufacturing Engineering at Wuhan University of Science and Technology, China [MTMEOF2019B01]

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In this study, a single-crystalline nanorods-built ZnO microflower was prepared through a simple hydrothermal method, and its surface morphology, crystal structure, element composition, and pore characteristic were characterized using various techniques. The ZnO microflower-based gas sensor showed remarkable response towards n-butanol with outstanding selectivity, low detection limit, and rapid response rate. The integration of 1D nanorods into a rational 3D structure was found to be an efficient strategy for fabricating high-performance gas sensors.
Assembly of one-dimensional (1D) nanorods into organized three-dimensional (3D) architectures, coupled with open interspaces, is favorable for gas-interface interaction and diffusion. In this paper, a single-crystalline nanorods-built ZnO microflower has been successfully prepared through a facile hydrothermal route. The surface morphology, crystal structure, element composition and pore characteristic of this ZnO product were also conducted using diverse technical methods. In addition, the morphology evolution process was further clarified through a time-dependent reaction. The ZnO microflower-based gas sensor declared a remarkable response towards n-butanol in terms of outstanding selectivity, low detection limit (similar to 0.1 ppm), and rapid response rate (<= 12 s for 1-100 ppm n-butanol). Moreover, this ZnO sensor still maintained a powerful response (R-a/R-g = 46.53) towards 100 ppm n-butanol when exposed to high-level relative humidity (RH = 80%). The improvement of gas-sensing response was discussed in detail. This work demonstrates that integration of 1D nanorods into rational 3D structure is an efficient strategy for fabricating high-performance gas sensor. (C) 2020 Elsevier B.V. All rights reserved.

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