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Assembly and Interfacial Effects in Hybrid Nanostructures of Zinc Oxide and Gold

Published online by Cambridge University Press:  31 January 2011

Daisuke Ito ,
Lallie C McKenzie ,
Keiichiro Masuko  and
James E Hutchison
Daisuke Ito
Affiliation:
daisukeb.ito@jp.sony.com, University of Oregon, Nanoscience Open Research Initiative and Materials Science Institute, Eugene, Oregon, United States
Lallie C McKenzie
Affiliation:
daisukeb.ito@jp.sony.com, University of Oregon, Nanoscience Open Research Initiative and Materials Science Institute, Eugene, Oregon, United States
Keiichiro Masuko
Affiliation:
kmasuko@uoregon.edu, University of Oregon, Nanoscience Open Research Initiative and Materials Science Institute, Eugene, Oregon, United States
James E Hutchison
Affiliation:
hutch@uoregon.edu, University of Oregon, Nanoscience Open Research Initiative and Materials Science Institute, Eugene, Oregon, United States
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Abstract

Gold nanoparticles were linked to ZnO films and nanowires using phosphonic and carboxylic acid ligands. TEM and STEM-HAADF characterization showed that gold nanoparticles modified with both types of ligands anchored on ZnO nanowire surfaces as well as on ZnO films. After removing the ligands from the interface between ZnO nanowires and supported gold nanoparticles, the electric conductivity in the presence of methanol vapor increased by 100 times as compared to the bare ZnO nanowire, which suggested enhanced-catalytic effects due to the hybrid structure. In addition, ZnO/Au nanomaterials were synthesized by linking ZnO nanoparticles and carboxylate-functionalized gold nanoparticles in solution. UV-vis characterization showed both the bandgap absorption from ZnO and the plasmon absorption from gold nanoparticles. Formation of hybrid nanosystems like these using organic ligands as linkers not only can lead to materials with enhanced properties but also minimize the waste of precious elements because the assembly process is an additive, rather than subtractive, process.

Keywords

colloidnanostructureself-assembly
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1217: Symposium Y – Catalytic Materials for Energy, Green Processes and Nanotechnology , 2009 , 1217-Y03-39
Copyright
Copyright © Materials Research Society 2010

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