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首页> 外文期刊>Applied Surface Science >Enhanced H2S Sensing Performance of a p-type Semiconducting PdO-NiO Nanoscale Heteromixture
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Enhanced H2S Sensing Performance of a p-type Semiconducting PdO-NiO Nanoscale Heteromixture

机译：p型半导体PdO-NiO纳米异质混合物的增强的H2S传感性能

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摘要

Semiconducting nanocrystalline nickel oxide (NiO) and PdO-doped NiO heteromixture (2, 5 and 10 wt%) have been synthesized via a metal-citrate complex method. The obtained materials were further characterized using TG/DTA, FT-IR, UV-vis, XRD, XPS, BET/BJH, SEM and TEM analyses to determine their structural and morphological properties. The results indicated that the spherical, uniform PdO nanoparticles were densely deposited on the NiO surface mainly in diameters of 10-15 nm. Moreover, the existence of various defect states was also analyzed with the help of photoluminescence (PL) spectroscopy. The gas response characteristics of synthesized materials were evaluated in the presence and absence of toxic gases such as hydrogen sulfide (H2S), carbon monoxide (CO), liquid petroleum gas (LPG), and ethanol (C2H5OH). The experimental results revealed that the sensitivity and selectivity of the NiO-based sensor material are dependent on the weight% of PdO loading in the NiO nanopowder. Among the investigated compound, the 5 wt% PdO-doped NiO sensor material showed excellent sensitivity and selectivity to 100 ppm H2S with a fast response/recovery characteristics of 6 s and 10 s, respectively. Furthermore, the 5 wt% PdO-doped NiO based sensor showed a linear relationship between the different concentrations of H2S gas and a significantly higher response to H2S even at the low concentration of 20 ppm (43%) at 60 degrees C. The dominant H2S gas sensing mechanisms in the NiO and 5 wt% PdO-doped NiO nanomaterials are systematically discussed based on the obtained characterization results. (C) 2017 Published by Elsevier B.V.
机译：通过金属柠檬酸盐络合物方法合成了半导体纳米晶氧化镍（NiO）和PdO掺杂的NiO异质混合物（2、5和10 wt％）。使用TG / DTA，FT-IR，UV-vis，XRD，XPS，BET / BJH，SEM和TEM分析进一步表征获得的材料，以确定其结构和形态特性。结果表明，球形，均匀的PdO纳米颗粒主要在10-15 nm的直径上密集地沉积在NiO表面上。此外，还借助光致发光（PL）光谱分析了各种缺陷状态的存在。在有毒气体（例如硫化氢（H2S），一氧化碳（CO），液化石油气（LPG）和乙醇（C2H5OH））存在与否的情况下，评估了合成材料的气体响应特性。实验结果表明，基于NiO的传感器材料的灵敏度和选择性取决于NiO纳米粉中PdO负载的重量％。在所研究的化合物中，掺有5 wt％PdO的NiO传感器材料对100 ppm H2S表现出出色的灵敏度和选择性，分别具有6 s和10 s的快速响应/恢复特性。此外，即使在60°C的低浓度20 ppm（43％）的情况下，掺杂5 wt％的PdO的基于NiO的传感器也显示出不同浓度的H2S气体与对H2S的明显更高的响应之间的线性关系。基于获得的表征结果，系统地讨论了NiO和5 wt％掺杂PdO的NiO纳米材料中的气体传感机理。 （C）2017由Elsevier B.V.发布

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