Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/29760
Title: Microstructural evolution of Au/TiO2 nanocomposite films: The influence of Au concentration and thermal annealing
Authors: Borges, Joel 
Kubart 
Keywords: Magnetron Sputtering; post-deposition thermal annealing
Issue Date: Apr-2015
Publisher: Elsevier
Keywords: Magnetron Sputtering; post-deposition thermal annealing
Issue Date: Apr-2015
Publisher: Elsevier
Project: info:eu-repo/grantAgreement/EC/FP7/315286/EU 
Abstract: Nanocomposite thin films consisting of a dielectric matrix, such as titanium oxide (TiO2), with embedded gold (Au) nanoparticles were prepared and will be analysed and discussed in detail in the present work. The evolution of morphological and structural features was studied for a wide range of Au concentrations and for annealing treatments in air, for temperatures ranging from 200 to 800 ºC. Major findings revealed that for low Au atomic concentrations (at. %), there are only traces of clustering, and just for relatively high annealing temperatures, T ≥ 500 ºC. Furthermore, the number of Au nanoparticles is extremely low, even for the highest annealing temperature, T = 800 ºC. It is noteworthy that the TiO2 matrix also crystallizes in the anatase phase for annealing temperatures above 300 ºC. For intermediate Au contents (5 at.% ≤ CAu ≤ 15 at.%), the formation of gold nanoclusters was much more evident, beginning at lower annealing temperatures (T ≥ 200 ºC) with sizes ranging from 2 to 25 nm as the temperature increased. A change in the matrix crystallization from anatase to rutile was also observed in this intermediate range of compositions. For the highest Au concentrations (> 20 at.%), the films tended to form relatively larger clusters, with sizes above 20 nm (for T ≥ 400 ºC). It is demonstrated that the structural and morphological characteristics of the films are strongly affected by the annealing temperature, as well as by the particular amounts, size and distribution of the Au nanoparticles dispersed in the TiO2 matrix.
URI: http://hdl.handle.net/10316/29760
DOI: 10.1016/j.tsf.2015.03.024
Rights: embargoedAccess
Appears in Collections:FCTUC Eng.Mecânica - Artigos em Revistas Internacionais

Files in This Item:
File Description SizeFormat
Microstructural evolution of Au TiO2 nanocomposite films.pdf1.89 MBAdobe PDFView/Open
Show full item record

SCOPUSTM   
Citations

15
checked on Jun 25, 2019

WEB OF SCIENCETM
Citations

14
checked on Jun 25, 2019

Page view(s)

193
checked on Aug 21, 2019

Download(s) 20

514
checked on Aug 21, 2019

Google ScholarTM

Check

Altmetric

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.