Sodium alginate mediated route for the synthesis of monodisperse silver nanoparticles using glucose as reducing agents海藻酸钠为保护剂葡萄糖为还原剂合成单分散银纳米粒子

报道了一种在水溶液中的简单绿色法制备纳米银溶胶。硝酸银，海藻酸钠素，葡萄糖分别做为银源，保护剂和还原剂。纳米溶胶的颜色从无色变到黄色，表明生成了纳米银粒子。利用透射型电子显微镜（TEM），紫外可见光谱（UV-vis）和X-射线衍射（XRD）对样品进行了分析。TEM图像表明，所得到的银纳米颗粒的为粒径较小，分散性较好的球状粒子，分布范围较窄，从3 nm 到12 nm。XRD结果表明所得到的纳米金属粒子为单晶的纳米银颗粒。通过UV光谱对反应时间、反应温度、银离子浓度及还原剂的浓度对粒径的影响进行了研究。由于该方法具有无污染、简单、廉价等优点，因此该方法可以做为一种较好的制备纳米银粒子的方法。该方法可以扩展到其它贵金属的技术应用，例如药用，工业应用等。

Sodium alginate mediated route for the synthesis of monodisperse silver nanoparticles using glucose as reducing agents

A simple and environmentally friendly method was developed for preparing colloidal silver nanoparticels in aqueous solutions using silver nitrate, sodium alginate and glucose as silver precursor, capping agents and reducing agents respectively. The formation of silver nanoparticles was observed by change of color from colorless to yellow. The silver nanoparticles were characterized by transmission electron microscopy (TEM), UV-visible spectroscopy (UV-vis) and X-ray diffraction (XRD). The TEM images showed that, the particles are small, well dispersed and spherical in shape with a narrow distribution from 3 nm to 12 nm. The XRD demonstrated that the obtained metallic nanoparticles are single crystalline silver nanoparticles. The effects of the reaction time, reaction temperature and the concentration of silver ion and reducing agent on the particle size were investigated by the UV-vis spectra. The present process is an excellent candidate for the preparation of silver nanoparticles because it is simple, pollutant free, inexpensive and easy to perform. The method may be extended to other noble metals, such as Au, Pd and Pt, for medicinal, industrial and technological applications.