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Ruthenium-decorated vanadium pentoxide for room temperature ammonia sensing

机译：钌修饰的五氧化二钒用于室温氨感测

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Layer structured vanadium pentoxide (V _(2) O _(5) ) microparticles were synthesized hydrothermally and successfully decorated by a facile wet chemical route, with ～10–20 nm sized ruthenium nanoparticles. Both V _(2) O _(5) and ruthenium nanoparticle decorated V _(2) O _(5) (1%Ru@V _(2) O _(5) ) were investigated for their suitability as resistive gas sensors. It was found that the 1%Ru@V _(2) O _(5) 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@V _(2) O _(5) . 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@V _(2) O _(5) sensor. Higher sensitivity of 1%Ru@V _(2) O _(5) compared to V _(2) O _(5) has been explained and is due to dissociation of atmospheric water molecules on 1%Ru@V _(2) O _(5) as compared to bare V _(2) O _(5) which makes hydrogen atoms available on Br?nsted 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.
机译：水热合成层状结构的五氧化二钒（V _（2）O _（5））微粒，并通过便捷的湿化学路线成功修饰了〜10–20 nm尺寸的钌纳米颗粒。研究了V _（2）O _（5）和装饰有钌纳米颗粒的V _（2）O _（5）（1％Ru @ V _（2）O _（5））作为电阻性气体传感器的适用性。发现1％Ru @ V _（2）O _（5）样品显示出非常高的选择性和对氨蒸气的敏感性。灵敏度测量在30°C（室温），50°C和100°C下进行。室温下1％Ru @ V _（2）O _（5）可获得最佳结果。在10至130 ppm的氨浓度范围内，室温下的响应时间短至0.52 s @ 130 ppm，恢复时间低至9.39 s @ 10 ppm，同时对多种气体和蒸气具有高选择性。 1％Ru @ V _（2）O _（5）传感器的主要特性是响应时间和恢复时间短，重现性高，选择性高以及在室温下运行。解释了1％Ru @ V _（2）O _（5）比V _（2）O _（5）更高的灵敏度，这是由于大气水分子在1％Ru @ V _（2）上解离）O _（5）与裸V _（2）O _（5）相比，氢原子在布朗斯台德位点上可用于氨吸附和感测。 X射线光电子能谱清楚地显示了带有氧化物薄层的钌的存在，傅立叶变换红外光谱法清楚地显示了水分子的存在。

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