NMR study of InP quantum dots: Surface structure and size effects

Authors
Tomaselli, M Yarger, JL Bruchez, M Havlin, RH deGraw, D Pines, A Alivisatos, AP
Citation
M. Tomaselli et al., NMR study of InP quantum dots: Surface structure and size effects, J CHEM PHYS, 110(18), 1999, pp. 8861-8864
Citations number
28
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF CHEMICAL PHYSICS
ISSN journal
00219606 → ACNP
Volume
110
Issue
18
Year of publication
1999
Pages
8861 - 8864
Database
ISI
SICI code
0021-9606(19990508)110:18<8861:NSOIQD>2.0.ZU;2-T
Abstract
We report the results of P-31 NMR measurements on trioctylphosphine oxide ( TOPO) passivated InP quantum dots. The spectra show distinct surface-cappin g sites, implying a manifold of crystal-ligand bonding configurations. Two In P-31 surface components are resolved and related to different electronic surroundings. With decreasing particle size the In P-31 core resonance rev eals an increasing upfield chemical shift related to the overall size depen dence of the InP electronic structure. (C) 1999 American Institute of Physi cs. [S0021-9606(99)70718-X].