摘要
以聚苯乙烯微球(PS)为模板,采用"种子-生长"法在聚苯乙烯微球表面直接镀覆具有自支撑性的金壳层,成形热处理去除PS模板,成功制备出空心微球结构圆柱形块体的泡沫金样品,并对其制备工艺进行了研究。研究表明:平均晶粒尺寸为4.6nm的金纳米粒子通过静电作用可成功粘附于交联聚苯乙烯微球(PS-DVB)表面。化学镀时以粘附的金纳米粒子为种子继续生长,沉积的金颗粒细小而致密,粒径主要分布于30～60nm,且微球表面金沉积层的包覆率高,包覆厚度70～90nm,PS模板去除后金沉积层具有良好的自支撑性。采用类似粉浆铸造工艺使gold/PS有孔隙地随机堆积成型,热处理去除聚苯乙烯模板后可成功获得圆柱体形状的泡沫金样品。制备的泡沫金由直径8～9μm的空心球壳组成,圆柱体直径约4mm,密度约1.5g/cm3,孔隙率高达92%。
The monolithic foamed gold was synthesized by seed-mediated growth with polystyrene（PS） template and casting procedure and heat treatment.The results indicate that the PS could be coated by gold colloid with average grain size of 4.6 nm which was made in toluene by the electrostatic effect.The deposited gold with thickness of 70-90 nm and grain size of 30-60 nm were obtained by electroless plating.It can be self-supported after the template removing.The casting procedure is analogous to slip-casting of ceramic that results in randomly-packed PS/Au spheres with void spaces between individual particles.The columniform foamed gold with hollow spheres of 8-9 μm,diameter of 4 mm,density of 1.5 g/cm3,and porosity of 92% was obtained after heat treatment.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第1期169-172,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(10804101)
等离子体物理国防科技重点实验室基金(9140C680502100C68)
国家重点基础研究发展计划项目(2007CB815102)
关键词
泡沫金
空心微球
制备
种子-生长法
gold foam
hollow microspheres
preparation
seed-mediated growth
