Synthesis and gas sensing properties of NiO/ZnO heterostructured nanowires

JOURNAL OF ALLOYS AND COMPOUNDS

卷:877

Article

Zhao, Sikai^1,3,4  Shen, Yanbai^1,2  Xia, Yong^3,4  Pan, Aifei^3,4  Li, Zhou^3,4  Carraro, Carlo^3,4  Maboudian, Roya^3,4 

[1] Northeastern Univ, Sch Resources & Civil Engn, Shenyang 110819, Peoples R China

[2] Northeastern Univ, State Key Lab Rolling & Automat, Shenyang 110189, Peoples R China

[3] Univ Calif Berkeley, Dept Chem & Biomol Engn, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Berkeley Sensor & Actuator Ctr, Berkeley, CA 94720 USA

关键词: Heterostructure;    NiO;    ZnO;    Nanowires;    Ethanol sensing;    Gas sensing;   

DOI  :  10.1016/j.jallcom.2021.160189

来源: Elsevier

【 摘 要 】

In this study, we report on the synthesis of the NiO/ZnO heterostructured nanowires by a facile two-step liquid phase route and their gas sensing characteristics employing Au interdigitated electrodes integrated on a miniature ceramic heater. Microstructural characterizations indicate that flocculent NiO particles are uniformly assembled on the outer surfaces of the single-crystalline ZnO nanowires, with diameters around 50 nm and lengths ranging from 500 nm to several mu m. The gas sensing investigation indicates that the sensors based on NiO/ZnO heterostructured nanowires exhibit high sensitivity towards ethanol, good reversibility, reproducibility, stability, robustness towards humidity, and fast response/recovery rates at the determined optimum operating temperature of 300 degrees C. Interestingly, the sensor shows higher ethanol response but longer recovery time in N-2 compared with those in air. An ethanol sensing mechanism is proposed to explain the experimental results. (C) 2021 Elsevier B.V. All rights reserved.

【 授权许可】

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