Construction of novel Pd–SnO2 composite nanoporous structure as a high-response sensor for methane gas
Construction of novel Pd–SnO2 composite nanoporous structure as a high-response sensor for methane gas
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DOI：
10.1016/j.jallcom.2020.154063
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发表时间：
2020-06
影响因子：
6.2
通讯作者：
Lijia Yao;Yuxiu Li;Y. Ran;Yue Yang;Rongjun Zhao;Linfeng Su;Yulin Kong;Dian Ma;Yunhua Chen-Yunhua-C
中科院分区：
文献类型：
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作者：
Lijia Yao;Yuxiu Li;Y. Ran;Yue Yang;Rongjun Zhao;Linfeng Su;Yulin Kong;Dian Ma;Yunhua Chen-Yunhua-C
合理设计贵金属元素复合改性的半导体金属氧化物，巧妙构造特殊的微结构，是提高化学电阻型气敏传感器气敏性能的有效途径。本文采用可控的低功耗水热法制备了Pd-SnO 2复合纳米孔结构。提出了一种新的弱酸性葡萄糖辅助生长方法来促进纳米孔结构的形成。在弱酸性环境下，前驱体SnCl 4·5 H2O完全水解，导致纳米晶难以生长，生成大量平均晶粒尺寸约为10 nm的小纳米粒子，并在纳米粒子之间组装形成间隙孔。实验结果表明，与纯SnO 2纳米颗粒相比，Pd-SnO 2复合纳米孔结构具有显著的甲烷气敏性能.特别是基于2. 5 mol% Pd-SnO 2复合纳米孔结构的传感器在340 °C的工作温度下，对3000 ppm的响应在3 s内达到17.60的超快响应，并在5 s内快速恢复，而基于CH 4气体的传感器表现出如此优异的性能尚未见报道。更重要的是，基于2. 5 mol% Pd-SnO 2复合纳米孔结构的传感器还具有高的重复性和长期稳定性。这些结果是由于复合材料独特的纳米孔结构以及Pd的化学增敏和电子增敏作用，为实现甲烷气体传感器优异的气敏性能提供了有效的策略。
The reasonable design of the semiconducting metal oxides modified by noble metal element compositing and the ingenious construct of the particular microstructure have been proved to be an effective method to promote the gas sensing capability of chemiresistor-type sensors. Herein, Pd–SnO2composite nanoporous structure is fabricated by a controllable and low-power hydrothermal method. A novel weak acid glucose-assisted growth method is proposed to promote the formation of nanoporous structure. Under weak acidic environment, the complete hydrolysis of precursor (SnCl4·5H2O), leading to nanocrystallines hard to grow and create a large number of small nanoparticles with an average crystallite size of ∼10 nm, which assemble to form interstitial holes between nanoparticles. The experimental results reveal that the Pd–SnO2composite nanoporous structure exhibits prominent methane (CH4) gas sensing performances as compared with pure SnO2nanoparticles. Especially, 2.5 mol% Pd–SnO2composite nanoporous structure based on sensor shows an ultra-fast response of 17.60 at 3000 ppm within 3 s to reach a stable-state and fast recovers within 5 s at an operating temperature of 340 °C, it has barely been reported that the sensor based on CH4gas presented such excellent performances. And more importantly, the sensor based on 2.5 mol% Pd–SnO2composite nanoporous structure also possesses high repeatability and long-term stability. These results are due to the fact that the unique nanoporous structures of composite and the chemical sensitization and electronic sensitization of Pd, which provide an effective strategy to achieve eminent gas-sensing performances of CH4gas sensors.