摘要
为了研究制备工艺条件对单分散银胶体稳定性的影响,在超声场作用下,以聚乙烯吡咯烷酮(PVP)为保护剂,硝酸银为前驱物,经硼氢化钾还原制备了稳定的单分散银胶体.考察了保护剂和还原剂用量、超声时间和超声功率等因素对银胶体稳定性的影响,利用透射电镜、选区电子衍射和分光光度等技术对制备的银胶体进行了表征.结果表明:银纳米粒子为面心立方(FCC)结构;PVP与AgNO3质量比为1:1时,PVP可有效保护银粒子,获得单分散的球形颗粒;AgNO3与KBH4摩尔比为1:2时,可制得单分散的类球形银纳米颗粒,直径约为20nm;超声50min制得的银胶体主要以单分散的球形纳米颗粒形式存在,粒径在10～20nm范围内,稳定性好.
Stable and mono-dispersed silver colloids have been produced by the reduction of AgNO3with the protection of PVP using KBH4 in the ultrasonic field. The main affective factors on stability of silver colloids, such as the concentration of PVP and KBH4 , ultrasonic time and power, are studied. The silver colloids are identified by TEM, SAED and Spectrophotometer. The result indicates that mono-dispersed silver nanoparticles are prepared with PVP/AgNO3 mass ratio of 1: 1. Selected area electron diffraction ( SAED) pattern reveals that silver nanoparticle is of face-centered cubic structure. Mono-dispersed spherical-like silver nanoparticles with about 20 nm size were synthesized with AgNO3/KBH4 molar ratio of 1:2. Well-dispersed silver particles with 10-20 nm size and spherical shape have been prepared after 50 min of ultrasonic treatment.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2005年第2期135-138,共4页
Materials Science and Technology
基金
国家自然科学基金资助项目(50271046).
关键词
超声诱导
单分散
银胶体
稳定性
表征
ultrasonic induction
mono-dispersed
silver colloid
stability
characterization
