Three-Dimensional Assemblies of Gold Colloids in Nanoporous Alumina Membranesast;

✍ Scribed by Taka-aki Hanaoka; Hans-Peter Kormann; Michael Kröll; Thomas Sawitowski; Günter Schmid

• Book ID: 101277963
• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 361 KB
• Volume: 1998
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/(sici)1099-0682(199806)1998:6<807::aid-ejic807>3.0.co;2-y

✦ Synopsis

Examples of a new class of three-dimensionally arranged uniform and random colloidal dispersions on the walls in the form of sub-monolayers without any aggregation. UV/Vis gold colloids have been prepared in the nanoscale pores of alumina membranes. Immobilization of the colloid particles spectra of the filled membranes showed an absorption maximum at ca. 525 nm arising from an excitation of the 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 plasmon resonance of the gold colloids. The dimensions of the pores can be "tuned" and given the diverse range of bearing suitable functional groups (Y = NH 2 , SH), followed by anchoring of the colloids by self-assembly onto the different colloids available, routes to novel catalysts and sensors can be envisaged. modified surface. This procedure gives tight and stable ensembles of colloids on the walls. TEM analyses revealed