高度分散的 Au 纳米粒子修饰的 WO 纳米片：激光辅助合成及其对乙醇蒸气检测的优异性能。

Highly dispersed Au nanoparticles decorated WO nanoplatelets: Laser-assisted synthesis and superior performance for detecting ethanol vapor.

机构信息

Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China; Information Center, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.

Key Laboratory of Materials Physics and Anhui Key Laboratory of Nanomaterials and Nanotechnology, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China.

出版信息

J Colloid Interface Sci. 2018 Mar 15;514:165-171. doi: 10.1016/j.jcis.2017.11.081. Epub 2017 Dec 11.

DOI:10.1016/j.jcis.2017.11.081

PMID:29253758

Abstract

Loading of noble metal nanoparticles (NPs) on the surfaces of semiconductor oxides to form a hybrid nanostructure is an effective strategy to improve gas-sensing performance. In this study, WO nanoplatelets decorated with Au NPs were prepared by laser ablation in liquids (LAL) with subsequent aging and annealing treatments. Results indicated that Au NPs with an average size of 7.8 ± 2.5 nm were highly dispersed on the surface of WO nanoplatelets. As gas-sensing materials, the obtained Au-decorated WO nanoplatelets showed lower operating temperature of 320 °C and higher response value of 3.5-fold in detecting ethanol molecules compared with pure WO nanoplatelets. Moreover, Au-decorated WO nanoplatelets displayed good selectivity toward ethanol compared with other tested vapors and excellent stability within several cycled measurements. These results can be ascribed to the supported Au NPs, which promote the adsorption and dissociation of oxygen species, eventually resulting in accelerated electron depletion on the surface of Au-WO hybrids.

摘要

负载贵金属纳米粒子 (NPs) 在半导体氧化物的表面上形成杂化纳米结构是提高气体传感性能的有效策略。在这项研究中，通过液体中的激光烧蚀 (LAL) 随后进行老化和退火处理，制备了负载 Au NPs 的 WO 纳米板。结果表明，Au NPs 的平均尺寸为 7.8±2.5nm，高度分散在 WO 纳米板的表面上。作为气体传感材料，与纯 WO 纳米板相比，所获得的 Au 修饰 WO 纳米板在检测乙醇分子时表现出更低的工作温度 320°C 和更高的响应值 3.5 倍。此外，Au 修饰的 WO 纳米板对乙醇表现出良好的选择性，与其他测试的蒸气相比，并且在几次循环测量中表现出优异的稳定性。这些结果可以归因于负载的 Au NPs，它们促进了氧物种的吸附和离解，最终导致 Au-WO 杂化表面上的电子耗尽加速。