ZnO nanoparticle size-dependent excitation of surface Raman signal from adsorbed molecules: Observation of a charge-transfer resonance

被引：98
|
作者：
Sun, Zhihua
Zhao, Bing
Lombardi, John R.
机构：
[1] Jilin Univ, State Key Lab Supramol Struct & Mat, Changchun 130012, Peoples R China
[2] CUNY City Coll, Dept Chem, New York, NY 10031 USA
来源：
APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 22期
基金：
中国国家自然科学基金; 美国国家科学基金会;
关键词：
D O I：
10.1063/1.2817529
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
By observing the Raman intensity of several molecules (4-mercaptopyridine and 4-mercaptobenzoic acid) adsorbed on the surface of ZnO nanocrystals as a function of particle size in the range of 18-31 nm diameter, we show that a large increase in intensity is observed near 28 nm. This is an indication of a size-dependent charge-transfer resonance. We interpret this effect as due to formation of a charge-transfer complex between a surface-bound exciton and the adsorbed molecule.
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