金纳米粒子的电化学合成及光谱表征

采用电化学方法合成各种形状的金纳米粒子，生成的金纳米粒子形貌与施加电流有关，通过匀速递增电流电解的方法，可制备得到哑铃形，球形以及棒状金纳米粒子，采用恒电流电解方法主要获得球形及哑铃形纳米粒子。利用透射电镜、紫外-可见光谱及拉曼光谱对金纳米粒子进行相关表征。紫外-可见光谱研究发现金纳米棒出现位于近红外区间的吸收峰(985 nm)，由此推测棒的长径比约为6。以结晶紫为探针分子，研究了金纳米粒子的表面增强拉曼光谱(SERS)效应，并分析得出其平躺的吸附模式。根据形貌表征的结果推断了纳米粒子的生长机理。

Electrochemical Synthesis and Spectroscopic Characterization of Gold Nanoparticles

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.