ISSN:
1434-1948
Keywords:
Gold colloids
;
Self-assembly
;
Nanoporous alumina
;
Three-dimensional organization
;
Chemistry
;
General Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
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-(CH2)x-Si(OR)3 and Y-(CH2)x-SiR(OR)2 bearing suitable functional groups (Y = NH2, 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.
Type of Medium:
Electronic Resource
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