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Three‐Dimensional Assemblies of Gold Colloids in Nanoporous Alumina Membranes ast;
Author(s) -
Hanaoka Takaaki,
Kormann HansPeter,
Kröll Michael,
Sawitowski Thomas,
Schmid Günter
Publication year - 1998
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/(sici)1099-0682(199806)1998:6<807::aid-ejic807>3.0.co;2-y
Subject(s) - colloid , chemistry , gold colloid , nanoporous , monolayer , surface plasmon resonance , nanoscopic scale , colloidal gold , membrane , nanotechnology , chemical engineering , absorption (acoustics) , nanoparticle , materials science , composite material , organic chemistry , biochemistry , engineering
Abstract Examples of a new class of three‐dimensionally arranged gold colloids have been prepared in the nanoscale pores of alumina membranes. Immobilization of the colloid particles was achieved by a modification of the inner walls with alkoxysilanes Y–(CH 2 ) x –Si(OR) 3 and Y–(CH 2 ) x –SiR(OR) 2 bearing suitable functional groups (Y = NH 2 , SH), followed by anchoring of the colloids by self‐assembly onto the modified surface. This procedure gives tight and stable ensembles of colloids on the walls. TEM analyses revealed uniform and random colloidal dispersions on the walls in the form of sub‐monolayers without any aggregation. UV/Vis spectra of the filled membranes showed an absorption maximum at ca. 525 nm arising from an excitation of the plasmon resonance of the gold colloids. The dimensions of the pores can be “tuned” and given the diverse range of different colloids available, routes to novel catalysts and sensors can be envisaged.