Nmr-Studies of the Surface-Structure and Dynamics of Semiconductor Nanocrystals

TitleNmr-Studies of the Surface-Structure and Dynamics of Semiconductor Nanocrystals
Publication TypeJournal Article
Year of Publication1992
AuthorsSachleben J.R, Wooten E.W, Emsley L., Pines A, Colvin V.L, Alivisatos A.P
JournalChemical Physics Letters
Volume198
Issue5
Pagination431-436
Date PublishedOct 16
ISBN Number0009-2614
Accession NumberWOS:A1992JT38500001
Keywordsrelaxation
Abstract

H-1 NMR studies of thiophenol capping groups on cadmium sulfide nanocrystals demonstrate that the coverage of the capping molecule depends on the size of the nanocrystal. Data are presented which show that as the size of the nanocrystal increases, the coverage of thiophenol decreases. In addition, information about the overall tumbling of the nanocrystal and the motion of the capping groups relative to the surface can be obtained from linewidth studies, indicating that the rotation of the capping groups is hindered in the smaller nanocrystals (r almost-equal-to 12 angstrom) and becomes less so in larger nanocrystals (r almost-equal-to 20 angstrom). The coverage data are related to the electronic properties of this important class of compounds.

URL<Go to ISI>://WOS:A1992JT38500001
DOI10.1016/0009-2614(92)80023-5
Short TitleNmr-Studies of the Surface-Structure and Dynamics of Semiconductor Nanocrystals
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