Properties investigation on isotropical conductive adhesives filled with silver coated carbon nanotubes
Properties investigation on isotropical conductive adhesives filled with silver coated carbon nanotubes
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DOI：
10.1016/j.compscitech.2006.05.010
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发表时间：
2007-05
影响因子：
9.1
通讯作者：
Hao Wu;Xuefei Wu;M. Ge;Guangxue Zhang;Guangxue Zhang;Yao Wang;Jianzhong Jiang
中科院分区：
文献类型：
--
作者：
Hao Wu;Xuefei Wu;M. Ge;Guangxue Zhang;Guangxue Zhang;Yao Wang;Jianzhong Jiang
本研究采用化学镀法制备镀银碳纳米管（SCCNT）。对这些纳米管进行了基本的材料表征，包括x射线衍射和透射电镜。分别以多壁碳纳米管（CNT）和SCCNT为导电填料，研制了两种等热带导电胶（ICA）。研究了上述ICA的电学、力学和老化性能，并与填充1μm平均尺寸Ag粒子的常规ICA进行了比较。结果表明：当碳纳米管填充量为31%时，体积电阻率渗透阈值达到2.4×10−3Ωcm；当碳纳米管填充量为23%时，抗剪强度达到最大值；在相同填料体积含量为28%的情况下，SCCNT填充的ICAs的导电电阻率为2.2×10−4Ωcm最低，同时填充CNT和SCCNT的ICAs具有较高的抗剪强度（19.6MPa）。85℃，RH85%， 1000h老化性能测试结果表明，同时填充CNT和SCCNT的ICA的体积电阻率和抗剪强度的变化均不超过15%，而填充微细Ag颗粒的ICA的导电电阻率和抗剪强度的变化分别为200%和35%。
In this study, chemical plating method was used to prepare silver coated carbon nanotubes (SCCNT). Fundamental materials characterizations including X-ray diffraction and transmission electro microscopy (TEM) were conducted on these nanotubes. Two kinds of isotropical conductive adhesives (ICA) were developed by using multi-walled carbon nanotubes (CNT), SCCNT as conductive fillers, respectively. The electrical, mechanical and aging properties of above ICAs were investigated and compared with that of conventional ICA filled with 1μm average-sized Ag particles. The results indicated that the percolation threshold of bulk resistivity reaches 2.4×10−3Ωcm for ICA filled with 31% CNT and the shear strength reaches the maximum value for ICA filled with 23% CNT. At the same filler volume content of 28%, the ICAs filled with SCCNT shows the lowest conductive resistivity of 2.2×10−4Ωcm and the ICAs filled with both CNT and SCCNT exhibit higher shear strength (19.6MPa). The testing results of aging properties under conditions of 85°C, RH85% for 1000h showed that the shifts of both bulk resistivity and shear strength did not exceed 15% for the ICAs filled with both CNT and SCCNT, while the shifts of conductive resistivity and shear strength were 200% and 35%, respectively, for ICA filled with micro-sized Ag particles.