Distance-Dependent Electron Transfer in Au/Spacer/Q-CdSe Assemblies

Abstract

CdSe quantum dots, in the form of colloidal nanocrystals, are bound to the surface of a gold electrode by bisulfide spacer molecules. The distance dependance of the electron transfer rate between the CdSe and the electrode was investigated by a time-resolved optoelectronic method and related to the length r of the spacer molecule 1–3 [Eq. (1)]. For β, a value of 0.50±0.05 Å−1 was found. k=k0 e−βr (1)