Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Water as Buffer Material for Gold Nanocluster Growth Elad Gross, Yonatan Horowitz, and Micha Asscher*
 

Summary: Water as Buffer Material for Gold Nanocluster Growth
Elad Gross, Yonatan Horowitz, and Micha Asscher*
Department of Physical Chemistry and the Farkas Center for Light-Induced Processes,
The Hebrew University of Jerusalem, Jerusalem 91904, Israel
Received May 10, 2005. In Final Form: July 18, 2005
Water molecules adsorbed on SiO2/Si(100) at 140 K to form amorphous solid water (ASW) layers were
utilized as a buffer for assisting the growth of gold nanoclusters. It was shown that the average height
and diameter of the clusters deposited on the silicon oxide substrate following the buffer annealing/
desorption increase as the buffer layer becomes thicker and as more gold is deposited. The clusters' height
and diameter were determined by tapping mode AFM and high-resolution SEM imaging, respectively.
Typical heights were between 0.5 and 4.5 nm, and the diameters were in the range of 3-9 nm for ASW
layer thickness of 7-100 ML and gold deposition in the range of 0.2-1.2 . The density of the clusters
decreased from 65 1010 to 8 1010 cm -2 in the same buffer layer thickness range. Significantly different
morphology of the clusters is obtained when compared to those formed by direct deposition of gold on the
silicon oxide surface and to those grown on top of Xe as buffer material.
1. Introduction
Metallic clusters supported on oxide substrates are the
basis for industrial heterogeneous catalysis.1-4 Gold
nanoclusters held on oxide substrates were recently found
tobeactiveasanefficientcatalystforCOoxidation,despite

  

Source: Asscher, Micha - Institute of Chemistry, Hebrew University of Jerusalem

 

Collections: Chemistry