Electrochemical preparation of cadmium selenide nanoparticles by the use of molecular templates

Citation
Sj. Choi et al., Electrochemical preparation of cadmium selenide nanoparticles by the use of molecular templates, J ELCHEM SO, 148(9), 2001, pp. C569-C573
Citations number
22
Categorie Soggetti
Physical Chemistry/Chemical Physics","Material Science & Engineering
Journal title
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
ISSN journal
00134651 → ACNP
Volume
148
Issue
9
Year of publication
2001
Pages
C569 - C573
Database
ISI
SICI code
0013-4651(200109)148:9<C569:EPOCSN>2.0.ZU;2-K
Abstract
We report the electrochemical preparation of cadmium selenide nanoparticles at gold electrodes modified with molecular templates. The molecular templa tes were obtained by properly arranging thiolated beta -cyclodextrin self-a ssembled monolayers (SAMs) on gold electrodes. Selenium was first deposited on a SAM-modified gold electrode at an appropriate potential, followed by reduction to HSe- in a solution containing Cd2+, leading to the deposition of CdSe. The Cd codeposited at the time of CdSe deposition was removed by a nodic dissolution at a potential where it was oxidized. Scanning electron m icroscopic pictures showed that Se-0 and cadmium selenide particles of smal ler than 60 and 150 Mm diam, respectively, were deposited on the SAM-modifi ed gold electrodes. Selenium particles of as small as 1-2 nm diam and simil ar to0.2 nm height were observed by in situ electrochemical scanning tunnel ing microscopy experiments during the early stages of electrochemical depos ition. (C) 2001 The Electrochemical Society.