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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Study of Electron-Phonon Coupling Dynamics in Au Nanorods by Transient Depolarization Measurements
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Study of Electron-Phonon Coupling Dynamics in Au Nanorods by Transient Depolarization Measurements

机译:瞬态去极化测量的Au纳米棒中电子 - 声子耦合动力学研究

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Electron-phonon (e-ph) coupling dynamics in Au nanorods are studied with femtosecond transient depolarization experiments. Au nanorods exhibit strongly anisotropic e-ph coupling dynamics. It is considered to arise from different weights of pump energy assigned to two polarization directions because of the anisotropy of Au nanorods rather than because of an intrinsic process. The e-ph coupling kinetics measured by transient experiments cannot be simply described by a single exponential function but by the integral of components contributed by random distribution of Au nanorods at all directions in aqueous solution. After this correction, the relationship between electron-phonon relaxation times and pump power is linear even in relatively high power. The time extrapolated to zero intensity is 0.75 ps, which is similar to the characteristic electron-phonon coupling time for nanodots and bulk Au.
机译:使用飞秒瞬时去极化实验研究了Au纳米棒中的电子 - 声子(E-PH)耦合动力学。 Au nanorods表现出强烈各向异性的E-pH耦合动力学。 由于Au纳米棒的各向异性而不是由于内在工艺,所以从分配到两个偏振方向的不同重量的泵能量被认为是从分配到两个偏振方向的不同权重。 通过瞬态实验测量的E-pH偶联动力学不能简单地通过单一指数函数简单地描述,而是通过在水溶液中所有方向上的Au纳米棒随机分布所贡献的组分的积分。 在该校正之后,即使在相对高的功率中,电子位置弛豫时间和泵浦电源之间的关系也是线性的。 推断为零强度的时间是0.75 ps,其类似于纳米蛋白和散装Au的特征电子 - 声子耦合时间。

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