Ternary heterojunctions synthesis and sensing mechanism of Pd/ZnO-SnO2 hollow nanofibers with enhanced H2 gas sensing properties

被引：73

作者：

Hu, Kelin ^{[1
]}

Wang, Feipeng ^{[1
]}

Shen, Zijia ^{[1
]}

Liu, Hongcheng ^{[1
]}

Xiong, Jianglin ^{[1
]}

机构：

[1] Chongqing Univ, State Key Lab Power Transmiss Equipment & Syst Se, Chongqing 400044, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2021年 / 850卷

基金：

中国国家自然科学基金;

关键词：

Nanofibers; H-2 gas sensing; Electro spinning; Heterojunction; Metal oxide semiconductor; COMPOSITE NANOFIBERS; PD; NANOSTRUCTURES; NANOPARTICLES; NANOSHEETS; NANOWIRES; SENSORS; FILMS; XPS;

D O I：

10.1016/j.jallcom.2020.156663

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In this paper, Pd/ZnO-SnO2 hollow nanofibers prepared by electrospinning and magnetron sputtering. The sensing materials exhibited extraordinary hydrogen (H-2) sensing behavior - the response reached 171 at 270 degrees C, and besides, the response time and recovery time were as low as 19 s and less than 1 s at 240 degrees C, with steady high selectivity and good repeatability. Such an enhanced sensing performance could be attributed to the Pd/ZnO/SnO2 ternary heterojunctions formed in the hollow nanofibers. Moreover, the materials were studied by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and especially the morphology formation process was further explained. The existence of Pd was confirmed to increase the resistance modulation range of heterojunction. In addition, the gas sensing mechanism based on the structure was proposed. (C) 2020 Elsevier B.V. All rights reserved.

引用

页数：12

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