Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 105, Issue 2-3, Pages 419-425Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2007.05.010
Keywords
core-shell composite; polyethyleneimine; silica nanoparticle; gold nanoparticle
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This paper reports a systematic investigation of the attachment of different sized gold nanoparticles (3.5-32nm) to the polyethyleneimine (PEI) and 3-aminopropyltrimethoxysilane (APTMS)-functionalized, respectively, surfaces of different sized silica nanoparticles (60-340 nm) at room temperature. Functionalization of the surfaces of silica nanoparticles with PEI or APTMS has a profound influence on the attachment gold nanoparticles. While PEI-functionalized silica surfaces bound the midnanometer gold nanoparticles (13-32nm), APTMS-functionalized silica surfaces did not. A series of different silica-gold core-shell composites were characterized using transmission electron microscopy (TEM) and UV-vis absorbance spectra. (c) 2007 Elsevier B.V. All rights reserved.
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