Sun Mengtao, Xia Lixin, Chen Maodu
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Oct 1;74(2):509-14. doi: 10.1016/j.saa.2009.06.055. Epub 2009 Jul 8.
Self-assembled dynamics of silver nanoparticles and self-assembled dynamics of 1,4-benzenedithiol (1,4-BDT) adsorbed on silver nanoparticles were investigated experimentally with surface-enhanced Raman scattering (SERS) and theoretically with density functional theory (DFT) and finite difference time domain (FDTD) method. The absorption spectroscopy of 1,4-BDT in silver sol at different time intervals was measured, which give the indirect evidence of self-assembled dynamics of silver nanoparticles and self-assembled dynamics of 1,4-benzenedithiol (1,4-BDT) adsorbed on silver nanoparticles. To obtain the direct evidence of self-assembled dynamics of silver nanoparticles and self-assembled dynamics of 1,4-benzenedithiol (1,4-BDT) adsorbed on silver nanoparticles, the SERS of 1,4-BDT were measured experimentally and investigated theoretically. The appearances of S-S stretching band (revealing the formation of multilayers of 1,4-BDT), and strongly enhanced S-C stretching, C-C ring stretching vibrational modes clearly show self-assembled dynamics of 1,4-BDT.
利用表面增强拉曼散射（SERS）对银纳米颗粒的自组装动力学以及吸附在银纳米颗粒上的1,4-苯二硫醇（1,4-BDT）的自组装动力学进行了实验研究，并采用密度泛函理论（DFT）和时域有限差分（FDTD）方法进行了理论研究。测量了不同时间间隔下1,4-BDT在银溶胶中的吸收光谱，这为银纳米颗粒的自组装动力学以及吸附在银纳米颗粒上的1,4-苯二硫醇（1,4-BDT）的自组装动力学提供了间接证据。为了获得银纳米颗粒的自组装动力学以及吸附在银纳米颗粒上的1,4-苯二硫醇（1,4-BDT）的自组装动力学的直接证据，对1,4-BDT的SERS进行了实验测量和理论研究。S-S伸缩带（揭示了1,4-BDT多层结构的形成）以及强烈增强的S-C伸缩、C-C环伸缩振动模式的出现清楚地表明了1,4-BDT的自组装动力学。
