Electronic and Vibrational Dynamics of Hollow Au Nanocages Embedded in Cu2O Shells

被引:3
作者
Szymanski, Paul [1 ]
Mahmoud, Mahmoud A. [1 ]
O'Neil, Daniel [1 ]
Garlyyev, Batyr [1 ]
El-Sayed, Mostafa A. [1 ,2 ]
机构
[1] Georgia Inst Technol, Sch Chem & Biochem, Laser Dynam Lab, Atlanta, GA 30332 USA
[2] King Abdulaziz Univ, Jeddah 21413, Saudi Arabia
关键词
GOLD NANOPARTICLES; RELAXATION DYNAMICS; CHARGE SEPARATION; HOT-ELECTRON; METAL; ULTRAFAST; ENERGY; SILVER; AG; NANOSTRUCTURES;
D O I
10.1111/php.12432
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
We have synthesized hollow Au nanocages embedded within thick porous shells of cuprous oxide (Cu2O). The shell causes a significant redshift of the localized surface plasmon resonance of Au into the near-IR. Electron-phonon coupling in the Au nanocage is 3-6 times faster in the core-shell structure due to the higher thermal conductivity of Cu2O compared to water. Coherent phonon oscillations within the Au lattice are characterized by a breathing mode of the entire structure for both bare and core-shell nanocages, an assignment made through the use of structural mechanics simulations. The experimental frequencies are obtained through simulations by selectively applying a force to the shell of the core-shell structure. We interpret this as rapid thermal expansion of the gold leading to a mechanical force that acts on the shell.
引用
收藏
页码:599 / 606
页数:8
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