阴离子聚电解质保护的金纳米粒子的制备及表征

Preparation and Characterization of Anionic Polyelectrolyte-Protected Gold Nanoparticles

采用NaBH4作为还原剂还原HAuCl4的方法,将阴离子聚电解质即聚丙烯酸(PAA)作为保护剂,成功制备了稳定性非常好的小粒径金纳米粒子.分别采用紫外 可见 近红外光谱仪(UV vis NIR)、透射电子显微镜(TEM)、光电子能谱仪(XPS)、X射线衍射仪(XRD)和电化学等实验方法对所制备样品进行表征.实验结果表明,合成体系的pH和所用阴离子聚电解质聚合物链的空间位阻对金纳米粒子的稳定性起着非常重要的作用.

Well-stable anionic polyelectrolyte-protected small gold nanoparticles were prepared by in situ reduction of HAuCl_4 with NaBH_4. UV-vis-near infrared spectrophotometer,transmission electron microscopy, X-ray photoelectron spectra, X-ray diffraction and electrochemical instrument were used to characterize the sample. The results indicate that both pH and space hindrance of polymer chain play important role in the formation of stable gold nanoparticles.