Raman Investigation of Nanosized TiO2: Effect of Crystallite Size and Quantum Confinement

被引：283

作者：

Xue, Xiangxin ^{[1
]}

Ji, Wei ^{[1
]}

Mao, Zhu ^{[1
]}

Mao, Huijuan ^{[1
]}

Wang, Yue ^{[1
]}

Wang, Xu ^{[1
]}

Ruan, Weidong ^{[1
]}

Zhao, Bing ^{[1
]}

Lombardi, John R. ^{[2
]}

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：

JOURNAL OF PHYSICAL CHEMISTRY C | 2012年 / 116卷 / 15期

基金：

美国国家科学基金会;

关键词：

SURFACE; SCATTERING; NANOPARTICLES; RESONANCE; ARRAYS; SERS;

D O I：

10.1021/jp2122196

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：

The influence of the TiO2 particle size on the enhanced Raman spectroscopy properties was systematically investigated on the nanometer-size scale. We report on the enhanced Raman spectrum of 4-mercaptobenzoic acid adsorbed on TiO2 nanoparticles. The results presented in this study highlight the major findings that the intensities of both the molecular lines and the phonon modes of TiO2 are strongly size-dependent. The TiO2 crystallite size estimated using the Scherrer equation varied from 6.8 to 14.2 nm; as a function of crystal size, a large increase in intensity is observed, with a maximum near 10.9 nm and a subsequent decline at larger sizes. Moreover, we have investigated quantum confinement effects between TiO2 and the adsorbed molecules and attribute this to a charge-transfer resonance, which is responsible for the Raman enhancement.

引用

页码：8792 / 8797

页数：6

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