Hyperfine Coupling in Colloidal n-Type ZnO Quantum Dots: Effects on Electron Spin Relaxation

被引：27
|
作者：
Whitaker, Kelly M. [1 ]
Ochsenbein, Stefan T. [1 ]
Smith, Alyssa L. [1 ]
Echodu, Dorothy C. [1 ]
Robinson, Bruce H. [1 ]
Gamelin, Daniel R. [1 ]
机构：
[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 34期
关键词：
OPTICAL-PROPERTIES; EPR-SPECTRA; NANOCRYSTALS; RESONANCE; MAGNETISM; ENERGY;
D O I：
10.1021/jp106356y
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：
Electron spin relaxation dynamics in colloidal ZnO quantum dots containing additional delocalized conduction band electrons (n-type) have been studied using electron paramagnetic resonance (EPR) spectroscopy. Variation of the Zn-67 (I = 5/2) nuclear isotope content within the quantum dots allows the effects of the electron-nuclear hyperfine interaction on spin-spin and spin-lattice relaxation dynamics to be explored. Long room-temperature spin-spin relaxation times of T-2 = 87 ns are observed in ZnO quantum dots almost completely depleted of Zn-67.
引用
收藏
页码：14467 / 14472
页数：6
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