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学科主题: 物理化学
题名: Molecular Conformations and Dynamics on Surfaces of Gold Nanoparticles Probed with Multiple-Mode Multiple-Dimensional Infrared Spectroscopy
作者: Bian, Hongtao1;  Li, Jiebo1;  Chen, Hailong1;  Yuan, Kaijun1;  Wen, Xiewen1;  Li, Yaqin2;  Sun, Zhigang2;  Zheng, Junrong1
通讯作者: 郑俊荣
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2012-04-12
DOI: 10.1021/jp300970p
卷: 116, 期:14, 页:7913-7924
收录类别: SCI
文章类型: Article
部门归属: 11
项目归属: 1102
产权排名: 2,7
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: Knowledge about molecular conformations and nuclear and electronic motions on surfaces of metal nanomaterials is critical for many applications but extremely difficult to obtain. We demonstrate that valuable information of this sort can be determined using multiple-mode multiple-dimensional vibrational spectroscopy. A model compound, 4-mercaptophenol, on the surface of 3.5 nm gold nanoparticles demonstrates the method. Its 3D molecular conformations and vibrational dynamics on the particle surfaces were determined with the method. The experimental results imply that on the particle surfaces, the ligand molecules cannot form energy-optimized hydrogen bonds because of the surface geometry constraint. The conclusion is supported with experiments on the ligand molecules in the crystalline phase and in a dilute solution. Our experiments also showed that the effect of the particle surface nonadiabatic electron/vibration coupling does not play a significant role in the vibrational relaxation of high-frequency modes (>1000 cm(-1)) about 3 angstrom away from the surface. Simple theoretical calculations support this observation. The method holds promise as a general tool for the studies of molecular structures and dynamics on the surfaces of nanomaterials. The capability of resolving 3D molecular conformations on nanomaterials surfaces is expected to be helpful for understanding specific intermolecular interactions and conformation-selective reactions (e.g., chirality selectivity) on the surfaces of these materials.
关键词[WOS]: 2D IR SPECTROSCOPY ;  VIBRATIONAL ECHO SPECTROSCOPY ;  INTERNAL-ROTATION ;  AQUEOUS-SOLUTIONS ;  ENERGY TRANSFER ;  METAL-PARTICLE ;  EXCITED-STATES ;  HYDROGEN-BOND ;  PHOTON-ECHO ;  SPECTRA
语种: 英语
WOS记录号: WOS:000302591300038
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/117882
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Rice Univ, Dept Chem, Houston, TX 77005 USA
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Mol React Dynam, Dalian 116023, Peoples R China

Recommended Citation:
Bian, Hongtao,Li, Jiebo,Chen, Hailong,et al. Molecular Conformations and Dynamics on Surfaces of Gold Nanoparticles Probed with Multiple-Mode Multiple-Dimensional Infrared Spectroscopy[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2012,116(14):7913-7924.
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