Electrostatic force microscopy study of single au-cdse hybrid nanodumbbells: evidence for light-induced charge separation

Ronny Costi, Guy Cohen, Asaf Salant, Eran Rabani, Uri Banin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

127 Scopus citations

Abstract

Electrostatic force microscopy is used to study light-induced charging in single hybrid Au-CdSe nanodumbbells. Upon illumination, nanodumbbells show negative charging, which is in contrast with CdSe rods and Au particles that show positive charging. This different behavior is attributed to charge separation in the nanodumbbells, where after excitation the electron is transferred to the gold tips and the hole is subsequently filled through tunneling interactions with the substrate. The process of light-induced charge separation at the metal-semiconductor interface is key for the photocatalytic activity of such hybrid metal-semiconductor nanostructures.

Original languageAmerican English
Pages (from-to)2031-2039
Number of pages9
JournalNano Letters
Volume9
Issue number5
DOIs
StatePublished - 13 May 2009

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