Facile synthesis of different ZnO nanostructures for detecting sub-ppm NO2 gas

• Published in: Materials today communications Vol. 22; p. 100826
• Main Authors: Dang, Van Thai, Nguyen, Thi Tu Oanh, Truong, Thi Hien, Le, Anh Thi, Nguyen, Tien Dai
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2020
• Subjects: Gas sensor; NO2; Solvothermal; ZnO; NO2; ZnO; Gas sensor; Solvothermal
• ISSN: 2352-4928; 2352-4928
• DOI: 10.1016/j.mtcomm.2019.100826

[Display omitted] •ZnO nanostructure was synthesized via the solvothermal method.•Controlling ZnO structure by using nickel acetate tetra hydrate as an effective additive•Detection of NO2 gas at sub-ppm level (0.25–1.0 ppm) with short response recovery time by using ZnO nanorod structure. We present the synthesis of ZnO nanostructures via the solvothermal method with the assistance of ethylene glycol and nickel acetate tetra hydrate, NA. By employing the NA, the synthesized ZnO structures had different morphologies. The synthesized ZnO material was characterized by scanning electron microscopy, x―ray diffraction, Raman spectroscopy, and energy dispersive spectroscopy. The sensitivity to NO2 gas of the synthesized ZnO was investigated using NO2 concentration of 0.25―1.0 ppm at operating temperature of 150―350 °C. The results indicated that the ZnO nanorods could be suitable for NO2 sensors. Based on these findings, we propose fabrication of a sensor detecting NO2 gas at the sub―ppm concentration.