Schottky barrier and catalytic effect induced high gas sensing of one-step synthesized Pd-SnO2 nanorods
首发时间:2011-12-08
Abstract:Uniformly loaded Pd-SnO2 nanorods are synthesized via a simple one-step hydrothermal route. The gas sensors fabricated from Pd-SnO2 nanorods exhibit high sensitivity and fast response. The sensitivity at 300 ℃ is up to 9.9, 36.8, 55.6, 89.1 and 168.2 upon exposure to 100, 200, 300, 500 and 1000 ppm ethanol, respectively. And the work temperature can be lowered down to 200 ℃. Such behaviors can be attributed to Schottky barrier at Pd/SnO2 interface and catalytic effect of Pd nanoparticles. Our results open a way for uniform modification of SnO2 nanorods with Pd nanoparticles and enhancing their gas sensing performance.
keywords: Nanomaterials Tin oxide Palladium Gas sensors Catalysts Schottky barrier
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一步合成Pd-SnO2纳米棒及其肖特基势垒和催化效应诱导的高气体传感性能
摘要:本文采用一步水热法成功地合成具有均匀负载的Pd-SnO2纳米棒。由该纳米棒构建的气体传感器具有高的灵敏度和快速的响应。将其放置在100、200、300、500和1000ppm的乙醇气体中,在300℃时,灵敏度分别达到9.9、36.8、55.6、89.1和168.2,并且工作温度能够降低至200℃。这样的行为主要归因于Pd/SnO2界面处的肖特基势垒和Pd纳米颗粒的催化效应的双重作用的结果。本实验结果为Pd纳米颗粒均匀修饰SnO2纳米棒和提高其气体传感性能打开了一个新的思路。
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