Synthesis of Au Nanoparticles in Mesoporous Titania Materials by Different Reduction Methods
Date Issued
2011
Date
2011
Author(s)
Liang, Chih-Peng
Abstract
This study focus on the synthesis of gold-embeded mesoporous titania nanoparticles and thin films (MTNs and MTTF, respectively). Mesoporous titania materials have been extensively studied because of their special characters, for example, high surface area, pore volume, and tunable pore size. Most importantly, titania is a semiconductor so has been widely used in photoelectronic devices and technologies. Recently, mesoporous titania materials doped with noble metals such as gold, silver and platinum have attracted considerable attention because the noble metals can enhance the efficiency of the titania-based devices. In this research, we attempted to use four different reduction methods (i.e., thermal treatment, photo treatment, liquid treatment and vapor treatment) to synthesize gold nanoparticles into MTNs and MTTF. The synthesized Au@MTNs and Au@MTTF were characterized with UV-Vis spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). We further systematically investigated the formation mechanism of gold nanoparticles in MTNs and MTTF. In the case of Au@MTNs, gold nanoparticles could be reduced in MTNs only by thermal treatment, and the size of the gold nanoparticles is around 6.7 nm. In the case of Au@MTTF, well-dispersed gold nanopaticles could be obtained on and inside (the size is 17.8 and 4.1 nm, respectively) the MTTF by photo treatment.
Subjects
mesoporous materials
mesoporous titania nanoparticles (MTNs)
mesoporous titania thin films (MTTF)
gold nanoparticles
reduction
Type
thesis
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