Photoinduced Ultrafast Charge Separation in Plexcitonic CdSe/Au and CdSe/Pt Nanorods

被引：84

作者：

Yu, Pyng ^{[1
]}

Wen, Xiaoming ^{[1
,3
]}

Lee, Yu-Chieh ^{[1
]}

Lee, Wen-Ching ^{[2
]}

Kang, Chia-Cheng ^{[2
]}

Tang, Jau ^{[1
]}

机构：

[1] Acad Sinica, Res Ctr Appl Sci, Taipei 115, Taiwan

[2] Fu Jen Catholic Univ, Dept Chem, New Taipei City 24205, Taiwan

[3] Univ New S Wales, Australian Ctr Adv Photovolta, Sydney, NSW 2052, Australia

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2013年 / 4卷 / 21期

关键词：

FERMI-LEVEL EQUILIBRATION; SEMICONDUCTOR NANOCRYSTALS; HYDROGEN-PRODUCTION; DYNAMICS; HETEROSTRUCTURES; NANOPARTICLES; NANODUMBBELLS; GENERATION; SINGLE;

D O I：

10.1021/jz401985k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Combining metal and semiconducting nanomaterials into one single nanocrystal, metal semiconducting nanocomposites have been attracting considerable research interest due to the integrated and unprecedented properties that arise at the heterostructure interface. Herein, the dynamics of photoexcited charge carriers in CdSe/Au and CdSe/Pt nanorods is probed via ultrafast spectroscopy. Upon 400 nm photoexcitation, the results show both hot and cold electrons transfer from CdSe to the metal counterpart. The injection of photoinduced electrons into the Au tip is faster than that into the Pt nanoparticles, but only Pt can completely extract the excited electrons from the CdSe nanorod. Combined with temperature-dependent photoluminescence spectra, the electron migration can be ascribed to the band alignments and the charge storage/discharge behavior of the metallic tips. These findings not only support the distinct difference in photocatalytic efficiency between CdSe/Au and CdSe/Pt nanorods but also shed light on better designing novel nanocomposites in photoenergy-converting nanomaterials.

引用

页码：3596 / 3601

页数：6

共 27 条

[1] The Role of Hole Localization in Sacrificial Hydrogen Production by Semiconductor-Metal Heterostructured Nanocrystals [J].