单分散银纳米颗粒的粒径调控及其光热转换性能

徐步锋，  吴大雄*

(青岛科技大学 材料科学与工程学院，山东 青岛 266042)

摘要： 以聚乙烯吡咯烷酮（PVPK30）为分散剂，以维生素C作为还原剂，在碱性条件下还原氯化银溶胶制备得到了不同粒径的单分散单质银纳米颗粒。用实验室自组装的配有AUTFSC半导体/固体激光器的光热转换评价系统对样品进行了光热性能的研究。结果表明，通过控制反应体系的pH值,可得到30、50、75和100 nm的单质银纳米颗粒;以50 nm的银纳米颗粒作为晶种，采用种子法通过改变氯化银溶胶的加入量可以得到120、150和200 nm的银纳米颗粒。在波长635 nm和1 064 nm的激光照射下,样品均表现出了明显的光热转换性能,并且随着粒径的减小,样品的光热转换效果越好。

 关键词：  银纳米颗粒；  光热转换； 激光；  粒径控制

中图分类号： TB 34            文献标志码： A

Particle Size Control and Photothermal Conversion Property of Monodispersed Silver Particles

 XU Bufeng,  WU Daxiong

(College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)

Abstract：  Monodispersed silver particles with different size were synthesized through a wet chemical method in which  AgCl sol was reduced by Vitamin C to yield silver particles in alkaline condition, with PVPK30 as dispersant. Photothermal conversion effects of the assynthesized products were evaluated on a labmade system equipped with a selfmade  AUTFSL semiconductor/solid state laser. The results showed that silver nanoparticles with size of 30, 50, 75 and 100 nm can be synthesized by adjusting pH values of reaction systems. Silver particles of 120, 150 and 200 nm can be synthesized through a twostep growth method with 50 nm silver nanoparticles as seeds. Dispersed in water, all silver particle samples with different sizes exhibit significant photothermal conversion effect enhancement under irradiation of 635 nm and 1 064 nm laser. The photothermal conversion efficiency is proved to increase with particle size decreasing.

Key words:  silver nanoparticles； photothermal conversion； laser； size control

收稿日期： 20140110

基金项目： 国家自然科学基金项目（51172117）；山东省自然科学基金项目（ZR2013EMM003);青岛市科技计划项目（1314148jch）.

作者简介：  徐步锋（1986—），男，硕士研究生.              *通信联系人.