还原剂对Ag粒子形貌和生长的影响

EFFECTS OF REDUCTANTS ON MORPHOLOGIES AND GROWTH OF SILVER PARTICLES

利用水热合成法在聚乙烯吡咯烷酮的存在下,通过添加不同种类的还原剂(葡萄糖、柠檬酸三钠和抗坏血酸)制备具有不同形貌与尺寸的银粒子。结果表明,还原剂的种类可改变晶体的成核-生长环境,从而极大地影响所得粒子的形貌与尺寸。在本实验环境中,晶体生长速率相对成核速率较大,导致当添加还原能力强的还原剂时所得到的粒子尺寸较大。

Silver nanoparticles with different morphologies and sizes were synthesized by hydrothermal method in the presence of poly （vinyl pyrrolidone）. Glucose, tdsodium citrate and ascorbic acid were respectively used as reductants in the preparation. The results show that the morpholosies and sizes of silver nanoparticles could be controlled by altering the reductant species, which can largely effect the nucleation and growth environment of the crystals. In this work, the growth rate of the crystals exceeds the nucleation rate of the crystals, resulting in the larger size of the nanoparticles prepared by the reductant with stronger reducing power.