【作者】 任可； 王一龙； 李维； 孙洁； 赵素玲； 陈志宏； 官建国；

【Author】 Ke Ren;Yilong Wang;Wei Li;Sun Jie;Suling Zhao;Zhihong Chen;Jianguo Guan;State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology;School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology;Center for Material Research and Analysis, Wuhan University of Technology;School of Science, Wuhan University of Technology;

【机构】 武汉理工大学材料复合新技术国家重点实验室； 武汉理工大学化学化工与生命科学学院； 武汉理工大学材料研究与测试中心； 武汉理工大学理学院；

【摘要】 针对目前制备的银包玻璃微珠（GM）核壳复合粒子存在壳层厚度大、不致密且银含量高等问题,本文提出了以硼氢化钠与葡萄糖作为复合还原剂,制备出具有壳层致密、低银含量和高导电率的银包玻璃微珠核壳复合粒子（GM@Ag CSCPs）。该方法采用强还原剂显著提高了溶液中银原子的过饱和度,有效地增加了银晶核的成核数量。与异相成核过程相比,利用自相成核过程具有较高的反应活化能,且其容易被动力学参数调控。因此通过降低成核温度,调节NaBH₄溶液的浓度与滴加速率等措施,巧妙地抑制了反应初期银晶核的自相成核。这种方法提高了内核粒子反应活性位点的利用效率,促使银在玻璃微珠表面高密度成核,最终制备出银含量低达5.1 wt%的核壳复合粒子。与其他制备方法或商品化的同类型样品相比,该核壳粒子的复合材料的银含量低至3.3%,且其具有更优异的导电率、屏蔽效能、电性能稳定性以及银迁移性能,表明这类导电填料在导电与电磁屏蔽复合材料、微电子器件等领域具有重要的应用前景。更多还原

【Abstract】 This work demonstrates the GM@Ag CSCPs with compact shells,ultra-low Ag content and high conductivity as well as fabrication approach about electroless plating on self-assembly functionalization layer of GM by binary reductants of NaBH₄ and glucose.In this approach,the strong driving force of reduction reaction favors the silver heterogeneous nucleation burst,due to significantly increasing the supersaturation level of silver atoms in comparison with the currently reported methods.By controlling initial kinetic parameters of the reduction reaction,decreasing temperature and adjusting the concentration or dropping rate of NaBH₄ solution,then homogeneous nucleation is dexterously restrained.Compared with the previously reported core-shell composite particles and commercial conductive fillers,those of the as-synthesized GM@Ag CSCPs show excellent conductivity,strong shielding effectiveness and high conducting stability.Most important of all,an effective approach of using this kind of conductive fillers with ultra-low Ag content is further developed to reduce tremendously silver migration.更多还原