Hao Mingzheng, Li Lei, Shao Xiaoming, Tian Ming, Zou Hua, Zhang Liqun, Wang Wencai
The Department of Materials Engineering, Taiyuan Institute of Technology, Taiyuan 030008, China.
Key Laboratory of Beijing City on Preparation and Processing of Novel Polymer Materials, Beijing University of Chemical Technology, Beijing 100029, China.
Polymers (Basel). 2022 Jul 3;14(13):2727. doi: 10.3390/polym14132727.
A novel and cost-effective method for the fabrication of highly conductive Al/Ag core-shell structured microspheres was proposed and investigated. The oxidative co-deposition of catechol and polyamine was firstly performed to modify the surface of the aluminum microsphere. Then, a two-step electroless plating was conducted to fabricate the Al/Ag microspheres. During the first step of the electroless plating process, the surface of the aluminum microsphere was deposited with silver nanoparticle seeds using n-octylamine and ethylene glycol. Then, during the second step of the electroless plating process, silver particles grew evenly to form a compact silver shell on the surface of aluminum via a silver mirror reaction. According to the scanning electron microscope and energy dispersive X-ray results, a compact and continuous silver layer was successfully generated on the surface of the aluminum. The valence of the sliver on the surface of the aluminum was confirmed to be zero, based on the X-ray photoelectron spectrometer and X-ray diffractometer analyses. As a result, the as-prepared Al/Ag microspheres exhibited a high conductivity of 10,000 S/cm. The Al/Ag/MVQ composite demonstrated low electrical resistivity of 0.0039 Ω·cm and great electromagnetic interference shielding effectiveness at more than 70 dB against the X-band, and this result suggests that the as-prepared composite is a promising conductive and electromagnetic shielding material.
提出并研究了一种新颖且具有成本效益的制备高导电性铝/银核壳结构微球的方法。首先进行儿茶酚和多胺的氧化共沉积以修饰铝微球的表面。然后，进行两步化学镀以制备铝/银微球。在化学镀的第一步中，使用正辛胺和乙二醇在铝微球表面沉积银纳米颗粒种子。接着，在化学镀的第二步中，银颗粒通过银镜反应均匀生长，在铝表面形成致密的银壳。根据扫描电子显微镜和能量色散X射线结果，在铝表面成功生成了致密且连续的银层。基于X射线光电子能谱仪和X射线衍射仪分析，证实铝表面银的化合价为零。结果，所制备的铝/银微球表现出10000 S/cm的高电导率。铝/银/甲基乙烯基硅橡胶复合材料表现出0.0039 Ω·cm的低电阻率以及在X波段超过70 dB的优异电磁干扰屏蔽效能，这一结果表明所制备的复合材料是一种有前景的导电和电磁屏蔽材料。
