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

M. Tomaselli; Jeffery L. Yarger; Marcel P. Bruchez; Robert H. Havlin; David deGraw; Alexander Pines; Paul Alivisatos

doi:10.1063/1.478858

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

Article 1999 en

Authors

MT
M. Tomaselli
JY
Jeffery L. Yarger
MB
Marcel P. Bruchez

Abstract

1 min read

We report the results of P31 NMR measurements on trioctylphosphine oxide (TOPO) passivated InP quantum dots. The spectra show distinct surface-capping sites, implying a manifold of crystal–ligand bonding configurations. Two In 31P surface components are resolved and related to different electronic surroundings. With decreasing particle size the In 31P core resonance reveals an increasing upfield chemical shift related to the overall size dependence of the InP electronic structure.

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