Electrostatic Force Microscopy Study of Single Au-CdSe Hybrid Nanodumbbells: Evidence for Light-Induced Charge Separation

被引：126

作者：

Costi, Ronny ^{[1
,2
]}

Cohen, Guy ^{[3
]}

Salant, Asaf ^{[1
,2
]}

Rabani, Eran ^{[3
]}

Banin, Uri ^{[1
,2
]}

机构：

[1] Hebrew Univ Jerusalem, Inst Chem, IL-91904 Jerusalem, Israel

[2] Hebrew Univ Jerusalem, Ctr Nanosci & Nanotechnol, IL-91904 Jerusalem, Israel

[3] Tel Aviv Univ, Raymond & Beverly Sackler Fac Exact Sci, Sch Chem, IL-69978 Tel Aviv, Israel

来源：

NANO LETTERS | 2009年 / 9卷 / 05期

基金：

以色列科学基金会;

关键词：

FERMI-LEVEL EQUILIBRATION; CORE-SHELL NANOCRYSTALS; SEMICONDUCTOR NANOCRYSTALS; METAL NANOCRYSTALS; QUANTUM DOTS; NANORODS; PHOTOIONIZATION; PHOTOCATALYSIS; NANOPARTICLES; GROWTH;

D O I：

10.1021/nl900301v

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：2031 / 2039

页数：9

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