Two distinctive energy migration pathways of monolayer molecules on metal nanoparticle surfaces
| Autor: | Guangxu Chen, Andrea Miranda, Jiebo Li, Huifeng Qian, Zhun Zhao, Xunmin Guo, Hailong Chen, Michael S. Wong, Nanfeng Zheng, Junrong Zheng, Kaijun Yuan, Yajing Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Science General Physics and Astronomy Nanoparticle Infrared spectroscopy Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Article General Biochemistry Genetics and Molecular Biology Metal Adsorption Monolayer Molecule Physics::Chemical Physics Multidisciplinary Relaxation (NMR) General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical physics visual_art visual_art.visual_art_medium Particle 0210 nano-technology |
| Zdroj: | Nature Communications, Vol 7, Iss 1, Pp 1-8 (2016) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Energy migrations at metal nanomaterial surfaces are fundamentally important to heterogeneous reactions. Here we report two distinctive energy migration pathways of monolayer adsorbate molecules on differently sized metal nanoparticle surfaces investigated with ultrafast vibrational spectroscopy. On a 5 nm platinum particle, within a few picoseconds the vibrational energy of a carbon monoxide adsorbate rapidly dissipates into the particle through electron/hole pair excitations, generating heat that quickly migrates on surface. In contrast, the lack of vibration-electron coupling on approximately 1 nm particles results in vibrational energy migration among adsorbates that occurs on a twenty times slower timescale. Further investigations reveal that the rapid carbon monoxide energy relaxation is also affected by the adsorption sites and the nature of the metal but to a lesser extent. These findings reflect the dependence of electron/vibration coupling on the metallic nature, size and surface site of nanoparticles and its significance in mediating energy relaxations and migrations on nanoparticle surfaces. Energy migrations at metal nanomaterial surfaces are fundamentally important to heterogeneous reactions. Here, the authors employ ultrafast vibrational spectroscopy to show two distinctive energy migration pathways of monolayer adsorbate molecules on differently sized metal nanoparticle surfaces. |
| Databáze: | OpenAIRE |
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