Au/TiO2 nanosystems:: A combined RF-sputtering/sol-gel approach

被引:69
作者
Armelao, L
Barreca, D [1 ]
Bottaro, G
Gasparotto, A
Tondello, E
Ferroni, M
Polizzi, S
机构
[1] Univ Padua, ISTM, CNR, Via Marzolo 1, I-35131 Padua, Italy
[2] Univ Padua, Dept Chem, INSTM, I-35131 Padua, Italy
[3] Univ Venice, Dept Chem Phys, Venice, Italy
[4] Univ Venice, INFM, UdR Venezia, Venice, Italy
关键词
D O I
10.1021/cm0353308
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
An original synthetic approach to Au/TiO2 nanosystems is developed. The adopted technique is based on the RF-sputtering of gold (guest) on porous titania xerogels (host) obtained by the sol-gel route. Such a combined synthetic pathway joins the peculiarities offered by the features of the sol-gel layers (porosity, nonbridging groups) and the advantages of plasmochemical methods (conformal coverage, infiltration power). In particular, host titania substrates were first prepared on silica by dip-coating from ethanolic solutions of Ti(OPri)(4) (OPri=iso-propoxy) and Hacac (2,4-pentanedione). Subsequently, Au depositions were performed on the as-prepared xerogels in Ar plasmas at low temperatures. The resulting samples were finally annealed in air between 200 and 600 degreesC with the aim of tailoring the system features as a function of thermal treatment and gold content. Their structural, compositional, and morphological evolution was investigated by Glancing Incidence X-ray Diffraction (GIXRD), Transmission Electron Microscopy (TEM), optical absorption spectroscopy, X-ray Photoelectron Spectroscopy (XPS), and Atomic Force Microscopy (AFM). The adopted strategy enabled the synthesis of Au/TiO2 nanosystems with characteristics strongly dependent on the deposited gold amount and processing conditions. In this way, materials with tunable structure, composition, and optical properties could be synthesized.
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页码:3331 / 3338
页数:8
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