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High performance hydrogen gas sensors based on PdO-decorated p-type CoV2O6 nanoparticles

材料科学 微晶 扫描电子显微镜 纳米颗粒 分析化学(期刊) 透射电子显微镜 拉曼光谱 乙二醇 化学工程 纳米技术 化学 复合材料 色谱法 光学 冶金 工程类 物理
作者
Marilena Moschogiannaki,Leila Zouridi,Jirasak Sukunta,Sukon Phanichphant,E. Gagaoudakis,Chaikarn Liewhiran,G. Kiriakidis,Vassiliοs Binas
出处
期刊:Sensors and Actuators B-chemical [Elsevier]
卷期号:324: 128744-128744 被引量:29
标识
DOI:10.1016/j.snb.2020.128744
摘要

P-type spherical-like cobalt vanadate (CoV2O6) nanoparticles were successfully synthesized using an easy and low-cost solution-based process based on ethylene-glycol (EG). Moreover, decoration of nanoparticles with 0−2 wt% palladium oxide (PdO) was achieved using the impregnation method in order to investigate their performance for hydrogen (H2) gas sensing applications. X-Ray Diffraction technique (XRD), Field-Emission Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM) were employed for the structural and morphological characterization. CoV2O6 nanoparticles of spherical-like morphology, highly crystalline triclinic structure with an average diameter of 75–200 nm and PdO crystallites with an average diameter of 5 nm deposited as islands on their surface were obtained. Raman spectrometry confirmed results obtained by the structural analysis, as well as the presence of PdO. Consequently, PdO-decorated CoV2O6 films of 3.5–7 μm thickness were deposited, by the spin-coating technique, onto Al2O3 substrates baring interdigitated Au electrodes. The films were tested against H2 gas (2.500–30.000 ppm) at operating temperatures ranging from 200 to 350 °C in dry air. It was demonstrated that CoV2O6 nanoparticles with an optimum PdO-decorating concentration of 1 wt% exhibited the highest (almost 114) H-sensing response towards 30.000 ppm H2, which was one order of magnitude higher than the undecorated one, as along with a short response time of 17 s, at an optimum operating temperature of 300 °C. In addition, the optimum (1 wt%) PdO- decorated CoV2O6 sensor displayed high H2 selectivity in comparison to NO, NO2, H2S and acetone gases, making PdO-decorated CoV2O6 nanoparticle thick films promising candidates as sensing elements for high performance H2 gas sensors.
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