Nonresonant Vibrational Energy Transfer on Metal Nanoparticle/Liquid Interface

Nonresonant Vibrational Energy Transfer on Metal Nanoparticle/Liquid Interface
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金属纳米颗粒/液体界面上的非共振振动能量转移

DOI:
10.1021/acs.jpcc.6b03777
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发表时间:
2016-10
影响因子:
3.7
通讯作者:
Zheng Junrong
Zheng Junrong
中科院分区:
化学3区
文献类型:
--
作者:
Li Jiebo;Yuan Kaijun;Chen Hailong;Mir;a Andrea;Shen Yuneng;Jiang Bo;Chen Yajing;Zhang Yufan;Guo Xunmin;Zheng Junrong

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了解金属纳米粒子/液体界面上的振动能量传递对于理解许多多相纳米催化剂中所涉及的能量转换过程是至关重要的。在这项研究中,我们用超快二维红外光谱研究了1 nm铂金属纳米粒子/液体界面上不同吸附位置上的CO分子之间的模式特定振动能量转移。结果表明,振动能量输运是由振动/振动耦合引起的,表面电子/振动中介很少。从顶位CO到桥位CO的能量转移速率约为1/140ps-1,最近的两个吸附中心之间的比速率约为1/400ps-1。脱相机理较好地描述了不同吸附位置之间的能量传递。机械耦合可能对能量传递有贡献,但分析表明,偶极/偶极相互作用的作用是能量传递的一个更为重要的因素。
Knowledge of vibrational energy transfer on a metal nanoparticle/liquid interface is essential for understanding the energy conversion process involved in many heterogeneous nanocatalyses. In this study, we investigate mode-specific vibrational energy transfer between CO molecules on different adsorbate sites on a 1 nm platinum metal nanoparticle/liquid interface by using ultrafast two-dimensional IR spectroscopy. The vibrational energy transport is found to be induced by vibration/vibration coupling with very little surface electron/vibration mediation. The energy transfer rate is determined to be about 1/140 ps–1 from the atop site CO to the bridge site CO, and the specific rate is around 1/400 ps–1 between the two nearest adsorbates. The energy transfer between different adsorbate sites can be described by the dephasing mechanism reasonably well. The mechanical coupling may contribute to the transfer, but analyses suggest that the role of dipole/dipole interaction is a more important factor for the ene...
DOI: 10.1063/1.3458825
发表时间: 2010-07
期刊: The Journal of chemical physics
影响因子: --
作者:
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