不同形貌金纳米粒子的合成与表征

Synthesis and characterization of gold nanoparticles with different morphologies

氯金酸水溶液在聚乙烯吡咯烷酮(PVP)存在下,于100℃恒温反应制备得到了不同形貌的金纳米粒子。通过改变PVP浓度、前体氯金酸浓度及反应时间,系统考察了影响不同形貌金纳米粒子生成的各种因素。采用UV-Vis及TEM等方法对金纳米粒子的光学性质及形貌进行了表征。结果表明,降低PVP浓度,提高氯金酸浓度,可以形成"风筝"或"蝌蚪"状等非球形金纳米粒子;提高PVP浓度,降低HAuCl4浓度,可以形成各向同性的球形金纳米粒子。

Gold nanoparticles with different morphologies were synthesized by using poly(vinyl pyrrolidone)(PVP)as macromolecular stabilizer and HAuCl4 as precursors in aqueous solutions at 100℃.The effects of PVP concentration,HAuCl4 concentration and reaction time on the formation of gold nanoparticles with different morphologies were discussed.The optical properties and morphologies of the synthesized gold nanoparticles were determined through UV-Vis and TEM measurements.The results showed that gold nanokites and nanotadpoles could be obtained at high HAuCl4 concentration and low PVP concentration,on the other hand,gold nanoparticles with spherical morphology could be obtained at low HAuCl4 concentration and high PVP concentration.