类银镜法高产量制备高稳定纳米银

Preparation of Silver Colloid Nanoparticles with High Stability and Concentrations on the Basis of Analogous Silver Mirror Reaction

摘要:

以AgNO3为前躯体，葡萄糖为还原剂，十六烷基三甲基溴化铵（CTAB）为络合剂和分散剂，一步法制备纳米银溶胶。利用紫外-可见光分光光度计（UV–Vis）、透射电子显微镜（TEM）和X射线衍射仪（XRD）对银溶胶的形成、颗粒尺寸形貌、稳定性和晶体结构进行了表征。结果表明，CTAB与Ag+和H+发生络合反应，稳定了H+，促进了葡萄糖对Ag+的还原；所制备银纳米粒子以球形为主，分散性良好，粒径分布范围为10~40 nm，银浓度高达0.025 mol/L，室温条件下能够稳定5个月以上。

Abstract:

Silver colloid nanoparticles, with high Ag+ concentration (up to 0.025 mol/L) and high stability (up to 5 months), have been synthesized via one step reduction of AgNO3 by glucose in the presence of cationic surfactant cetyltrimethylammonium bromide (CTAB). The reaction process, size distribution, morphology, and structure of particles have been characterized by UV/Visible absorption spectrophotometry, transmission electron microscopy (TEM) and X-ray diffractometer (XRD). Results indicate that CTAB accelerates the reaction between silver ions and glucose, because it stabilizes H+. TEM images show that silver sol consists of well-dispersed agglomerates of spherical nanoparticles with particle size from 10 to 40 nm.