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Quantitative Study of Au Catalytic Nanoparticles by Stem and Hrtem

Published online by Cambridge University Press:  01 February 2011

Fengting Xu ,
Laurent Menard ,
Huiping Xu ,
Joo Kang ,
Shangpeng Gao ,
Lin-lin Wang ,
Anatoly Frenkel ,
Ralph G Nuzzo ,
Duane D Johnson  and
Judith C Yang
Fengting Xu
Affiliation:
fex1@pitt.edu, Kennametal Inc., Surface Tech. Department, 1600 Technology Way, Latrobe, Pa, 15650, United States, 724-539-4935
Laurent Menard
Affiliation:
lmenard@uiuc.edu, University of Illinois at Urbana-Champaign, Department of Chemistry, United States
Huiping Xu
Affiliation:
huipxu@pitt.edu, University of Pittsburgh, Department of Materials Science & Engineering
Joo Kang
Affiliation:
kang@mrl.uiuc.edu, University of Illinois at Urbana-Champaign, Department of Chemistry
Shangpeng Gao
Affiliation:
spgao1@yahoo.com, University of Pittsburgh, Department of Materials Science & Engineering
Lin-lin Wang
Affiliation:
llw@uiuc.edu, University of Illinois at Urbana-Champaign, Department of Materials Science and Engineering
Anatoly Frenkel
Affiliation:
anatoly.frenkel@yu.edu, Yeshiva University, Department of Physics
Ralph G Nuzzo
Affiliation:
nuzzo@mrl.uiuc.edu, University of Illinois at Urbana-Champaign, Department of Chemistry
Duane D Johnson
Affiliation:
duanej@uiuc.edu, University of Illinois at Urbana-Champaign, Department of Materials Science and Engineering, United States
Judith C Yang
Affiliation:
jyang@engr.pitt.edu, University of Pittsburgh, Department of Materials Science & Engineering, United States
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Abstract

The highly dispersed metal (e.g. Au) nanoparticles have exhibited exceptional catalytic activity for several reactions, including CO oxidation. Their high catalytic activity has been attributed to nanoparticles nano-structural effects (including cluster thickness, shape, chemical information, and number of atoms of the cluster). The three dimensional exact structure and chemical bonding state of these supported nanoparticles is still challenging to be quantified by conventional methods due to their limitations in understanding size distribution of supported metal nanoparticles that are usually less than 1 nm (< 100 atoms). In this paper, the structure of Au heterogeneous catalysts has been successfully characterized by High Resolution Electron Microscopy (HREM), Z-contrast Scanning Transmission Electron Microscopy (STEM). The ligand protected Au13 nanoparticles on TiO2 support have been studied by ozone and thermal treatments to remove the ligands. The ozone removal method results in the truncated cuboctahedral structure while the thermal treatment results in the cuboctahedral structure. The ozone treatment yields less Au nanoparticles sintering than thermal treatment. Their FCC structure was confirmed by quantified Z-contrast STEM, HREM and its Fourier transformation.

Keywords

catalyticscanning transmission electron microscopy (STEM)nanostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 900: Symposium O – Nanoparticles and Nanostructures in Sensors and Catalysis , 2005 , 0900-O04-05
Copyright
Copyright © Materials Research Society 2006

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References

REFERENCES

(1) Nanoparticles: From Theory to Application; Schmid, G., Ed.; Wiley-VCH: Weinheim, 2004.Google Scholar
(2) Metal Nanoparticles: Synthesis, Characterization, and Applications; Feldheim, D. L.; Foss, C. A., Eds.; Marcel Dekker, Inc.: New York, 2002.Google Scholar
(3) Templeton, A. C.; Wuelfing, W. P.; Murray, R. W. Acc. Chem. Res. 2000, 3327.Google Scholar
(4) Valden, M.; Lai, X.; Goodman, D. W. Science 1998, 281, 1647.Google Scholar
(5) Hills, C. W.; Mack, N. H.; Nuzzo, R. G. J. Phys. Chem. B 2003, 107,2626.Google Scholar
(6) Teo, B. K.; Shi, X.; Zhang, H. J. Am. Chem. Soc. 1992, 114, 2743.Google Scholar
(7) Bellon, P. L.; Manassero, M.; Sansoni, M. J. Chem. Soc. Dalton Trans. 1972, 1481.Google Scholar
(8) Briant, C. E.; Hall, K. P.; Wheeler, A. C.; Mingos, D. M. P. J. Chem. Soc.Chem. Commun. 1984, 248.Google Scholar
(9) Schmid, G.; Pfeil, R.; Boese, R.; Brandermann, F.; Meyer, S.; Calis, G. H. M.; van der Velden, J. W. A. Chem. Ber. 1981, 114, 3634.Google Scholar
(10) Yang, J. C., Bradley, S., Gibson, J.M., Materials Characterization, 2003, 51, 101.Google Scholar
(11) Yang, J. C., Bradley, S. and Gibson, J. M., Microsc. Microanal. 2000, 6, 353.Google Scholar
(12) Singhal, A., Yang, J. C. and Gibson, J. M., Ultramicroscopy, 1997, 67, 191.Google Scholar
(13) Williams, D. B.; Carter, C. B. Transmission Electron Microscopy; Plenum Press: New York, 1996.Google Scholar
(14) To be publishedGoogle Scholar