High ethanol sensitivity of Palladium/TiO₂ nanobelt surface heterostructures dominated by enlarged surface area and nano-Schottky junctions

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• 作者：Dongzhou Wang ; Weijia Zhou ; Peiguang Hu ; Yu Guan ; Limei Chen ; Jianhua Li ; Guancong Wang ; Hong Liu ; Jiyang Wang ; Guozhong Cao ; Huaidong Jiang
• 关键词：Hydrothermal method ; Surface-coarsening ; Pd nanoparticle ; TiO2 nanobelt surface heterostructure ; Gas sensors
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 出版时间：15 December, 2012
• 年：2012
• 卷：388
• 期：1
• 页码：144-150
• 全文大小：999 K

文摘

TiO₂ nanobelts were prepared by the hydrothermal growth method. The surface of the nanobelts was coarsened by selective acid corrosion and functionalized with Pd catalyst particles. Three nanobelt samples (TiO₂ nanobelts, surface-coarsened TiO₂ nanobelts and Pd nanoparticle/TiO₂ nanobelt surface heterostructures) were configured as gas sensors and their sensing ability was measured. Both the surface-coarsened nanobelts and the Pd nanoparticle-decorated TiO₂ nanobelts exhibited dramatically improved sensitivity to ethanol vapor. Pd nanoparticle-decorated TiO₂ nanobelts with surface heterostructures exhibited the best sensitivity, selectivity, working temperature, response/recovery time, and reproducibility. The excellent ethanol sensing performance is attributed to the large surface area and enhancement by Schottky barrier-type junctions between the Pd nanoparticles and TiO₂ nanobelts.