Modification of anatase using noble-metals (Au, Pt, Ag): Toward a nanoheterojunction exhibiting simultaneously photocatalytic activity and plasmonic gas sensing
Modification of anatase using noble-metals (Au, Pt, Ag): Toward a nanoheterojunction exhibiting simultaneously photocatalytic activity and plasmonic gas sensing
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DOI：
10.1016/j.apcatb.2017.06.010
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发表时间：
2017-12-05
影响因子：
22.1
通讯作者：
Neri, Giovanni
中科院分区：
文献类型：
--
作者：
Karmaoui, Mohamed;Lajaunie, Luc;Neri, Giovanni
基于非水溶胶-凝胶过程，已经成功地建立了一种新的和原始的方法，以在一锅和低温下制备准球形单分散的TiO 2纳米颗粒（NPs）以及贵金属（NM）@TiO2异质结构（NM=Au，Pt，Ag，2 wt%）。这已经通过使用氧乙酰丙酮钛作为新的单一来源前体来实现。该系统已深入研究了先进的表征技术。通过使用NMR，我们已经证明了这个看似简单的合成背后的相对复杂的机制，介导的溶剂和生成的物种的反应，与许多单独的有机和有机金属分子被确定为参与该机制。通过先进的扫描透射电子显微镜研究了NM @ TiO 2异质结构的形貌和结构，而贵金属纳米颗粒的化学状态通过X射线光电子能谱（XPS）检查。未掺杂和贵金属（Au，Pt，Ag）装饰准/球形TiO 2纳米粒子也作为传感界面，导致开发一个高灵敏度的电导NO气体传感器在黑暗和紫外可见光照射下，在其同类的第一个结果。此外，光催化活性（PCA）也进行了评估，在气-固相，通过监测太阳光照射下的NOx的降解。Au改性的TiO 2表现出改善的光催化效率，相比未改性的TiO 2。皇冠版权所有（C）2017由Elsevier B. V.发布。保留所有权利。
A new and original method, based on a non-aqueous sol-gel process, has been successfully established to produce quasi-spherical monodispersed TiO2 nanoparticles (NPs) and also noble metals (NM)@TiO2 heterostructures (NM=Au, Pt, Ag, 2 wt%), in one-pot and at low temperature. This has been achieved by using titanium oxyacetylacetonate as new single source precursors. This system has been deeply investigated by advanced characterization techniques. By using NMR, we have demonstrated the relatively complex mechanism behind this apparently simple synthesis, mediated by the reaction of the solvent and generated species, with many separate organic and organometallic molecules identified as being involved in the mechanism. The morphology and structure of the NM@TiO2 heterostructures were investigated by advanced scanning transmission electron microscopy while the chemical state of the noble metal nanoparticles was check by X-ray photoelectron spectroscopy (XPS). Undoped and noble metal (Au, Pt, Ag) decorated quasi/spherical TiO2 nanoparticles worked also as sensing interfaces, leading to the development of a highly sensitive conductometric NO gas sensor under both dark and UV-vis light irradiation, in the first result of its kind. Furthermore, the photocatalytic activity (PCA) was also evaluated, in the gas-solid phase, by monitoring the degradation of NOx under solar-light irradiation. Au-modified TiO2 showed improved photocatalytic efficiencies, compared to unmodified TiO2. Crown Copyright (C) 2017 Published by Elsevier B.V. All rights reserved.