Femtosecond transient absorption dynamics of close-packed gold nanocrystal monolayer arrays

被引：24
|
作者：
Eah, SK
Jaeger, HM
Scherer, NF
Lin, XM
Wiederrecht, GP
机构：
[1] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA
[2] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA
[3] Argonne Natl Lab, Div Chem, Argonne, IL 60439 USA
[4] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA
[5] Univ Chicago, Dept Chem, Chicago, IL 60637 USA
来源：
CHEMICAL PHYSICS LETTERS | 2004年 / 386卷 / 4-6期
基金：
美国国家科学基金会;
关键词：
D O I：
10.1016/j.cplett.2004.01.056
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：
Femtosecond transient absorption spectroscopy is used to investigate hot electron dynamics of close-packed 6 mn gold nanocrystal monolayers. Morphology changes of the monolayer caused by the laser pump pulse are monitored by transmission electron microscopy. At low pump power, the monolayer maintains its structural integrity. Hot electrons induced by the pump pulse decay through electron-phonon (e-ph) coupling inside the nanocrystals with a decay constant that is similar to the value for bulk films. At high pump power, irreversible particle aggregation and sintering occur in the nanocrystal monolayer, which cause damping and peak shifting of the transient bleach signal. Published by Elsevier B.V..
引用
收藏
页码：390 / 395
页数：6
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