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Pt-functionalized Amorphous RuOx as Excellent Stability and High-activity Catalysts for Low Temperature MEMS Sensors
Small ( IF 13.0 ) Pub Date : 2023-04-22 , DOI: 10.1002/smll.202300006 Na Luo 1 , HaiJie Cai 1 , Bo Lu 2 , Zhenggang Xue 1 , Jiaqiang Xu 1
Small ( IF 13.0 ) Pub Date : 2023-04-22 , DOI: 10.1002/smll.202300006 Na Luo 1 , HaiJie Cai 1 , Bo Lu 2 , Zhenggang Xue 1 , Jiaqiang Xu 1
Affiliation
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The unsaturated coordination and abundant active sites endow amorphous metals with tremendous potential in improving metal oxide semiconductors’ gas-sensing properties. However, the amorphous materials maintain the metastable status and easily transfer into the lower-active crystals during the gas-sensing process at high working temperatures, significantly limiting their further applications. Here, a bimetal amorphous PtRu catalyst is developed by accurately regulating the introduction of Pt species into amorphous RuOx supports to realize the highly active and stable H2S gas-sensing detection. It is found that incorporation of low-concentration Pt species can effectively maintain the amorphous state of initial RuOx and delay the crystallization temperature as high as 100 °C. Further, ex situ XPS and in situ Raman spectroscopy analysis confirm that active Pt species can facilitate H2S adsorption by strong Pt-S coordination and dissociate the sulfur species to the surrounding support, which contribute to the chemisorption and sensitization of H2S. Meanwhile, electron transport at the interface between Pt, RuOx and ZnO further activates the reaction process at the surface of the gas-sensitive material. The final PtRu-modified ZnO (PtRu/ZnO) sensor enables the detection of H2S in the ultra-low concentration range of 15–2000 ppb with remarkable stability.
中文翻译：
Pt 功能化非晶 RuOx 作为低温 MEMS 传感器的优异稳定性和高活性催化剂
不饱和配位和丰富的活性位点赋予非晶金属在改善金属氧化物半导体气敏性能方面的巨大潜力。然而，非晶材料在高工作温度下的气敏过程中保持亚稳态并容易转变为活性较低的晶体，极大地限制了其进一步的应用。在此，通过精确调控Pt物种引入非晶RuO x载体中，开发了双金属非晶PtRu催化剂，以实现高活性和稳定的H 2 S气敏检测。研究发现，低浓度Pt物质的掺入可以有效维持初始RuO x的非晶态，并延迟结晶温度高达100℃。此外，异位XPS和原位拉曼光谱分析证实，活性Pt物质可以通过强Pt-S配位促进H 2 S吸附，并将硫物质解离到周围的载体上，这有助于H 2 S的化学吸附和敏化。同时，Pt、RuO x和ZnO之间界面的电子传输进一步激活了气敏材料表面的反应过程。最终的 PtRu 改性 ZnO (PtRu/ZnO) 传感器能够在 15–2000 ppb 的超低浓度范围内检测 H 2 S，并且具有出色的稳定性。
更新日期：2023-04-22
中文翻译：
Pt 功能化非晶 RuOx 作为低温 MEMS 传感器的优异稳定性和高活性催化剂
不饱和配位和丰富的活性位点赋予非晶金属在改善金属氧化物半导体气敏性能方面的巨大潜力。然而，非晶材料在高工作温度下的气敏过程中保持亚稳态并容易转变为活性较低的晶体，极大地限制了其进一步的应用。在此，通过精确调控Pt物种引入非晶RuO x载体中，开发了双金属非晶PtRu催化剂，以实现高活性和稳定的H 2 S气敏检测。研究发现，低浓度Pt物质的掺入可以有效维持初始RuO x的非晶态，并延迟结晶温度高达100℃。此外，异位XPS和原位拉曼光谱分析证实，活性Pt物质可以通过强Pt-S配位促进H 2 S吸附，并将硫物质解离到周围的载体上，这有助于H 2 S的化学吸附和敏化。同时，Pt、RuO x和ZnO之间界面的电子传输进一步激活了气敏材料表面的反应过程。最终的 PtRu 改性 ZnO (PtRu/ZnO) 传感器能够在 15–2000 ppb 的超低浓度范围内检测 H 2 S，并且具有出色的稳定性。
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