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用于室温氨传感的钌修饰五氧化二钒

Ruthenium-decorated vanadium pentoxide for room temperature ammonia sensing.

作者信息

Birajdar Shobha N, Hebalkar Neha Y, Pardeshi Satish K, Kulkarni Sulabha K, Adhyapak Parag V

机构信息

Centre for Materials for Electronics Technology (C-MET) Panchwati, Off Pashan Road Pune-411008 India

International Advanced Research Centre for Powder Metallurgy and New Materials Hyderabad-500005 India.

出版信息

RSC Adv. 2019 Sep 12;9(49):28735-28745. doi: 10.1039/c9ra04382a. eCollection 2019 Sep 9.

DOI:10.1039/c9ra04382a
PMID:35529636
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9071197/
Abstract

Layer structured vanadium pentoxide (VO) microparticles were synthesized hydrothermally and successfully decorated by a facile wet chemical route, with ∼10-20 nm sized ruthenium nanoparticles. Both VO and ruthenium nanoparticle decorated VO (1%Ru@VO) were investigated for their suitability as resistive gas sensors. It was found that the 1%Ru@VO sample showed very high selectivity and sensitivity towards ammonia vapors. The sensitivity measurements were carried out at 30 °C (room temperature), 50 °C and 100 °C. The best results were obtained at room temperature for 1%Ru@VO. Remarkably as short a response time as 0.52 s @ 130 ppm and as low as 9.39 s @ 10 ppm recovery time at room temperature along with high selectivity towards many gases and vapors have been noted in the 10 to 130 ppm ammonia concentration range. Short response and recovery time, high reproducibility, selectivity and room temperature operation are the main attributes of the 1%Ru@VO sensor. Higher sensitivity of 1%Ru@VO compared to VO has been explained and is due to dissociation of atmospheric water molecules on 1%Ru@VO as compared to bare VO which makes hydrogen atoms available on Brønsted sites for ammonia adsorption and sensing. The presence of ruthenium with a thin layer of oxide is clear from X-ray photoelectron spectroscopy and that of water molecules from Fourier transform infrared spectroscopy.

摘要

通过水热法合成了层状结构的五氧化二钒（VO）微粒，并通过简便的湿化学路线成功地用尺寸约为10 - 20纳米的钌纳米颗粒进行了修饰。研究了VO和钌纳米颗粒修饰的VO（1%Ru@VO）作为电阻式气体传感器的适用性。发现1%Ru@VO样品对氨蒸气表现出非常高的选择性和灵敏度。在30℃（室温）、50℃和100℃下进行了灵敏度测量。1%Ru@VO在室温下获得了最佳结果。值得注意的是，在10至130 ppm的氨浓度范围内，在室温下响应时间短至0.52 s（@130 ppm），恢复时间低至9.39 s（@10 ppm），同时对许多气体和蒸气具有高选择性。短响应和恢复时间、高重现性、选择性和室温操作是1%Ru@VO传感器的主要特性。解释了1%Ru@VO比VO具有更高灵敏度的原因，这是由于与裸露的VO相比，大气水分子在1%Ru@VO上解离，使得布朗斯特位点上有氢原子可用于氨的吸附和传感。从X射线光电子能谱中可以清楚地看到钌与薄氧化层的存在，从傅里叶变换红外光谱中可以看到水分子的存在。

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