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以银离子为辅助粒子,十六烷基三甲基溴化铵(CTAB)为表面活性剂,抗坏血酸为弱还原剂,利用晶种法制备棒状金纳米粒子,着重研究晶种用量与氯金酸量的比例对棒状纳米粒子形状和产率的影响。利用透射电子显微镜(TEM)和X射线衍射(XRD)仪对纳米粒子的形貌及晶体结构进行分析,利用紫外可见光谱(UV-Vis)对产物进行光谱表征。结果表明,纳米棒为面心立方结构,其UV-Vis出现位于530nm处的短波吸收和970～980nm的长波吸收,随着晶种与氯金酸用量比例的增加,纳米棒的长径比出现先增大后减小的趋势,并最终形成球形颗粒。最后探讨晶种用量影响金纳米棒生长的机制。
Silver ions as auxiliary particles, cetyltrimethylammonium bromide (CTAB) as a surfactant, ascorbic acid as a weak reducing agent, the use of seed crystal preparation of rod-shaped gold nanoparticles, focusing on the amount of seed crystal and chloroauric acid The influence of the ratio of the amount on the shape and yield of rod-shaped nanoparticles. The morphology and crystal structure of the nanoparticles were characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). The products were characterized by UV-Vis spectroscopy. The results show that the nanorods have a face-centered cubic structure with shortwave absorption at 530nm and longwave absorption at 970-980nm. With the increase of the proportion of the seed crystal to the chlorauric acid, the aspect ratio of the nanorods First increase and then decrease the trend, and eventually the formation of spherical particles. Finally, the mechanism of the effect of the amount of seed crystal on the growth of gold nanorods is discussed.