期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 21, 期 8, 页码 4240-4245出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8cp05932b
关键词
-
资金
- National Science Foundation of China [NSFC-21627805, 21673004, 21821004]
- NSF China [CHE-1503865]
- 111 Project China [B13003]
- MOST China [2017YFA0204702]
- NSFC [21803006]
Three model systems are designed to investigate energy transport between molecules on metal nanoparticle surfaces. Energy is rapidly transferred from one carbon monoxide (CO) molecule to another CO molecule or an organic molecule on adjacent surface sites of 2 nm Pt particles within a few picoseconds. On the contrary, energy flow from a surface organic molecule to an adjacent CO molecule is significantly slower and, in fact, within experimental sensitivity and uncertainty the transfer is not observed. The energy transport on particle surfaces (about 2 km s(-1)) is almost ten times faster than inside a molecule (200 m s(-1)). The seemingly perplexing observations can be well explained by the combination of electron/vibration and vibration/vibration coupling mechanisms, which mediate molecular energy dynamics on metal nanoparticle surfaces: the strong electron/vibration coupling rapidly converts CO vibrational energy into heat that can be immediately sensed by nearby molecules; but the vibration/vibration coupling dissipates the vibrational excitation in the organic molecule as low-frequency intramolecular vibrations that may or may not couple to surface electronic motions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据