Size, shape, and temperature dependence of the phonon relaxation dynamics of CdSe nanocrystals

被引：3
作者：
Guo, N. G. [1 ,2 ]
Zhou, Z. F. [1 ,2 ]
Huang, Y. L. [1 ,2 ]
Yang, X. X. [1 ,2 ]
Jiang, R. [1 ,2 ]
Ma, Z. S. [1 ,2 ]
Sun, Chang Q. [1 ,2 ,3 ]
机构：
[1] Xiangtan Univ, Key Lab Low Dimens Mat & Applicat Technol, Xiangtan 411105, Hunan, Peoples R China
[2] Xiangtan Univ, Fac Mat Optoelect & Phys, Xiangtan 411105, Hunan, Peoples R China
[3] Nanyang Technol Univ, Sch Elect & Elect Engn, NOVITAS, Singapore 639798, Singapore
来源：
CHEMICAL PHYSICS LETTERS | 2013年 / 585卷
关键词：
RAMAN-SCATTERING; QUANTUM DOTS; LATTICE CONTRACTION; PBSE; SILICON;
D O I：
10.1016/j.cplett.2013.09.024
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：
From the perspective of bond order-length-strength correlation, we have formulated the Raman phonon relaxation dynamics of CdSe nanocrystals in terms of the length and energy response of the representative bond for all of the entire specimen to the change of crystal shape, size, and the heating conditions. In addition to quantification of the bond length, bond energy, atomic cohesive energy, thermal expansion coefficient, and average coordination numbers of CdSe nanostructures in various shapes, consistency between theory predictions and measurements clarifies that the bond relaxation due to heating and bond-order reduction is responsible for the frequency shift of the CdSe lattice vibration. (C) 2013 Elsevier B. V. All rights reserved.
引用
收藏
页码：167 / 170
页数：4
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