Abstract：Two electrochemical methods were used to synthesize Au nanoparticles(AuNPs) with different shapes depending on the applied current. The dumbbell, spheroid and rod-like AuNPs were synthesized by increasing the current with a certain increment, while spheroid and dumbbell AuNPs were obtained by applying constant current. The AuNPs were characterized by TEM, UV-Vis spectrum and surface enhanced Raman spectra (SERS). One absorption band located at near-IR region was observed on the AuNPs, indicating the existence of gold nanorods with the aspect ratio of about 6. The SERS effect from the AuNPs surface was studied by using crystal violet as probe molecules, which adsorbed on AuNPs surface with flat orientation. Meanwhile, the forming mechanism of AuNPs involving crystallization and growth was deduced based on the TEM results.
[1] ZHANG Li-de，MO Ji-mei(张立德，牟季镁). Nano-Materials and Nano-Structure(纳米材料和纳米结构). Beijing: Science Press(北京：科学出版社)，2001. 2. [2] Zhu J J，Liao X H，Chen H Y. Materials Research Bulletin，2001, 36: 1687. [3] HU Xiao-ya，CHEN Hong-yuan(胡效亚，陈洪渊). University Chemistry(大学化学)，2002, 17(2): 1. [4] Bianca M I，Van der Zande，Bohmer M R，et al. J. Phys. Chem. B, 1997, 101: 852. [5] Yu Y Y，Chang S S，Lee C L，et al. J. Phys. Chem. B，1997, 101(34)：6661. [6] Reetz M T，Helbig W. J. Am. Chem. Soc.，1994, 116: 7401. [7] Peng Z A，Peng X G. J. Am. Chem. Soc.，2001, 123: 1389. [8] Nikoobakht B，El-sayed M A. Chem. Mater.，2003, 15: 1957. [9] CHEN Jian，ZHANG Wei-hong，ZHANG Zhuo-liang，et al(陈 建, 张卫红，张卓良，等). Acta Scientiarum Naturaliun Universitatis Sunyatseni(中山大学学报·自然科学版), 1995, 34: 114. [10] LI Qin，ZHANG Min，LIN Shu-huang，et al(李 勤，张 敏，林书煌，等). Chinese Journal of Light Scattering(光散射学报), 1995, 7: 218.
