摘要
提出一种制备银包铜(Cu-Ag)核壳颗粒的一步化学置换法。使用成本较低的柠檬酸三纳(SC)作为还原剂和螯合剂,用明胶(Gelatin)作为分散剂,硫酸银(Ag_2SO_4)为Ag源,用一步化学置换法制备银包铜(Cu-Ag)核壳颗粒,研究了Ag_2SO_4和SC用量对Cu-Ag颗粒包覆效果和抗氧化性能的影响。结果表明,SC的剂量直接影响表面包裹的Ag颗粒形貌和均匀度。Ag_2SO_4剂量越大则Cu表面的Ag包裹量越大,导电性越好。当SC的剂量为1.5 g,Ag_2SO_4的剂量为8.0 g时Cu-Ag颗粒包覆效果好且电阻较低(仅为1.1Ω),因此可尽量降低Ag的消耗量提高颗粒的导电性。
Micro- and nano-sized Cu and Ag core-shell particles were fabricated by a simple and quick-making method with copper micro-particles, gelatin and silver sulfate （Ag2SO4） as raw materials, and citric acid trisodium （SC） as reducing- and chelating-agent. The influence of SC and Ag2SO, on the morphologies and oxidation resistance of Cu-Ag particles were investigated. The results showed that the dosage of SC directly affected the uniformity and morphology of the Ag coated Cu particles. The more the Ag2SO4 was used, the lower the conductive resistance was for the prepared particles. With dosages of 1.5 g and 8.0 g for SC and Ag2SO4 respectively, the Cu- particles could be covered by Ag nanoparticles completely to form core-shell structured Cu-Ag particles, thereafter, the electrical resistance of sheets made of which can reach as low as 1.1Ω.
作者
才滨
张哲娟
孙卓
CAI Bin ZHANG Zhejuan SUN Zhuo(School of Physics and Materials Science, Engineering Research Center for Nanophotonics and Advanced Instrument, Ministry of Education, East China Normal University, Shanghai 200062, Chin)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2016年第12期903-908,共6页
Chinese Journal of Materials Research
基金
国家青年自然基金资助项目11204082
上海市自然基金项目16ZR1410700
上海市闵行区企校合作项目2015MH218
华东师范大学研究生科研创新实践YJSKC2015-32资助项目~~
关键词
金属材料
银包铜金属颗粒
核壳结构
螯合剂
导电性
metallic materials, Ag coated Cu particles, core-shell particles, chelating agent, conductivity
