Modification of anatase using noble-metals (Au, Pt, Ag): Toward a nanoheterojunction exhibiting simultaneously photocatalytic activity and plasmonic gas sensing

被引:50
作者
Karmaoui, Mohamed [1 ]
Lajaunie, Luc [2 ]
Tobaldi, David Maria [3 ]
Leonardi, Gianluca [4 ]
Benbayer, Chahinez [5 ]
Arenal, Raul [2 ,6 ]
Labrincha, Joao A. [3 ]
Neri, Giovanni [4 ]
机构
[1] Univ Birmingham Edgbaston, Coll Engn & Phys Sci, Sch Chem, Birmingham B15 2TT, W Midlands, England
[2] Univ Zaragoza, Inst Nanociencia Aragoin, Lab Microscopias Avanzadas, Zaragoza 50018, Spain
[3] Univ Aveiro, Dept Mat & Ceram Engn, CICECO Aveiro Inst Mat, Campus Univ Santiago, P-3810193 Aveiro, Portugal
[4] Univ Messina, Dept Engn, I-98166 Messina, Italy
[5] Univ Sci & Technol Oran, Dept Ind Chem, Fac Chem, BP 1505, El Mnaouar 31000, Oran, Algeria
[6] ARAID Fdn, Zaragoza 50018, Spain
关键词
New non-aqueous sol-gel process; Formation mechanism; STEM-HAAOF/XPS photocatalytic; activity/gas-solid phase; Gas sensing/conductometric NO sensor; GOLD NANOPARTICLES; TIO2; NANOCRYSTALS; TITANIUM-DIOXIDE; ROOM-TEMPERATURE; OPTICAL-PROPERTIES; LIGHT IRRADIATION; PARTICLE-SIZE; NANO-TITANIA; FERMI-LEVEL; THIN-FILMS;
D O I
10.1016/j.apcatb.2017.06.010
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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.
引用
收藏
页码:370 / 384
页数:15
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