单分散水性硫普罗宁包覆金纳米粒子可控制备

Controlled synthesis of well-dispersed Au nanoparticles passivated by tiopronin

利用紫外-可见光谱（UV-vis）、X衍射（X-ray Diffraction,XRD）和透射电子显微镜（Transmission Electron Microscope,TEM）等研究小尺寸水溶性金纳米粒子的可控制备.在乙酸和甲醇（体积比为1：6）的混合系统中,通过NaBH4对三水氯金酸还原,将硫普罗宁分子包覆到金纳米粒子表面,得到尺寸可控、稳定的硫普罗宁包覆的金纳米粒子水溶胶.通过控制金与硫普罗宁的摩尔比（Au/S比）,金纳米粒子的尺寸能够在2~8nm范围内得到有效控制.本文中,当Au/S比分别为1：3,1：1和3：1时,所合成的金纳米粒子的尺寸分别为（2.8±0.3）,（4.0±0.3）,（6.1±0.4）nm.

In this paper,a simple method was presented to synthesize well-dispersed Au nanoparticles in acetic acid and methanol mixture solution（volume ratio=1：6）.In this study,HAuCl4.3H2O was reduced by NaBH4,and Au particle was caped by tiopronin.The X-ray diffraction（XRD）,UV-visible spectra and transmission electron microscope（TEM） results demonstrated that the as-synthesized Au nanoparticles were well-dispersed and very stable.By adjusting the ratio of Au to S（tiopronin）,Au particles with different size were prepared.When Au/S was 1：3,1：1 and 3：1,respectively,the size of as-synthesized Au nanoparticle was（2.8±0.3）,（4.0±0.3） and（6.1±0.4） nm,respectively.