摘要
采用化学还原法,将六偏磷酸钠作为分散剂、硼氢化钠作为还原剂还原硝酸银,通过对比六偏磷酸钠不同含量及硼氢化钠与硝酸银的不同摩尔比寻找最佳条件制备出了纯无机体系下高度稳定且分散的纳米银胶。紫外-可见光谱分析表明,该法合成的纳米银胶的特征吸收峰在400 nm以下。透射电子显微镜表明该银胶粒径大小分布范围窄、平均粒径小于10 nm、成单一类球形。传统的有机体系合成的纳米银胶表面容易被一层表面活性剂或离子型聚合物吸附不易清除,这些残留物会直接影响颗粒的物理化学性质,该纯无机体系制备的纳米银胶表面吸附的六偏磷酸钠具有亲水效应,便于清除,易于制备纯净的银粉。该方法无需pH、温度和超声等外加条件的控制,是一种简单有效的合成方法。
High stability and dispersibility colloidal silver nanoparticles in pure inorganic system were prepared by wet chemical reduction of AgNO3 with NaBH4 and with sodium hexametapnosphate as dispersant through optimizing the sodium hexametapnosphate concentrations and the molar ratios of NaBH4 and AgNO3.Feature absorptions of the colloids obtained from UV-vis analysis appears at below 400 nm.TEM shows that colloidal silver nanoparticles have narrow particle size distribution,and a mean particle size below 10 nm with single spherical-like shape.The colloidal silver nanoparticles prepared in traditional organic systems are easily adsorbed by surface active agents or ionic polymers which could not be easily removed and thus the residues would directly influence the physical and chemical properties of the colloidal silver nanoparticles.The dispersant of sodium hexametapnosphate adsorbed on the colloidal silver nanoparticles prepared in pure inorganic system is a water loving reagent which could be removed easily for preparing pure colloidal silver nanoparticles.This method is simple and effective for preparing colloidal silver nanoparticles without any control of pH,temperature,ultrasound,etc.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2013年第10期2187-2191,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金(20905066)
关键词
无机体系
稳定
分散
纳米银胶
pure inorganic system
stability
dispersibility
colloidal silver nanoparticles
