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Title: Surface modification of Au/TiO2 catalysts by SiO2 via atomic layer deposition

Abstract

Atomic layer deposition (ALD) was utilized for the surface engineering of metallic nanoparticles to tame their sintering problems and catalytic activities. We chose the surface modification of gold nanocatalysts as an example to demonstrate the concept of this ALD-based approach. Herein, an active Au/TiO{sub 2} catalyst was modified by amorphous SiO{sub 2} via ALD, and the samples were characterized by inductively coupled plasma-optical emission spectrometry (ICP-OES), scanning (SEM-EDX) and transmission electron microscope-energy-dispersive X-ray spectrometry (TEM-EDX), X-ray diffraction (XRD), and thermogravimetry/differential thermogravimetry (TG/DTG), and the catalytic activities in CO oxidation and H{sub 2} oxidation were tested with respect to the pretreatment temperature and SiO{sub 2} content. A significant sintering resistance and changes in catalytic activities were observed. The difference between the SiO{sub 2}/Au/TiO{sub 2} samples prepared by gas-phase ALD and solution-phase chemical grafting was discussed.

Authors:
 [1];  [1];  [1];  [2];  [1]
  1. ORNL
  2. {Steve} H [ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Center for Nanophase Materials Sciences (CNMS)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
941039
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry
Additional Journal Information:
Journal Volume: 112; Journal Issue: 25; Journal ID: ISSN 0022-3654
Country of Publication:
United States
Language:
English

Citation Formats

Ma, Zhen, Brown, Suree, Howe, Jane Y, Overbury, Steven, and Dai, Sheng. Surface modification of Au/TiO2 catalysts by SiO2 via atomic layer deposition. United States: N. p., 2008. Web.
Ma, Zhen, Brown, Suree, Howe, Jane Y, Overbury, Steven, & Dai, Sheng. Surface modification of Au/TiO2 catalysts by SiO2 via atomic layer deposition. United States.
Ma, Zhen, Brown, Suree, Howe, Jane Y, Overbury, Steven, and Dai, Sheng. Tue . "Surface modification of Au/TiO2 catalysts by SiO2 via atomic layer deposition". United States.
@article{osti_941039,
title = {Surface modification of Au/TiO2 catalysts by SiO2 via atomic layer deposition},
author = {Ma, Zhen and Brown, Suree and Howe, Jane Y and Overbury, Steven and Dai, Sheng},
abstractNote = {Atomic layer deposition (ALD) was utilized for the surface engineering of metallic nanoparticles to tame their sintering problems and catalytic activities. We chose the surface modification of gold nanocatalysts as an example to demonstrate the concept of this ALD-based approach. Herein, an active Au/TiO{sub 2} catalyst was modified by amorphous SiO{sub 2} via ALD, and the samples were characterized by inductively coupled plasma-optical emission spectrometry (ICP-OES), scanning (SEM-EDX) and transmission electron microscope-energy-dispersive X-ray spectrometry (TEM-EDX), X-ray diffraction (XRD), and thermogravimetry/differential thermogravimetry (TG/DTG), and the catalytic activities in CO oxidation and H{sub 2} oxidation were tested with respect to the pretreatment temperature and SiO{sub 2} content. A significant sintering resistance and changes in catalytic activities were observed. The difference between the SiO{sub 2}/Au/TiO{sub 2} samples prepared by gas-phase ALD and solution-phase chemical grafting was discussed.},
doi = {},
journal = {Journal of Physical Chemistry},
issn = {0022-3654},
number = 25,
volume = 112,
place = {United States},
year = {2008},
month = {1}
}