Synthesis of Uniform α-Si3N4 Nanospheres by RF Induction Thermal Plasma and Their Application in High Thermal Conductive Nanocomposites
Synthesis of Uniform α-Si3N4 Nanospheres by RF Induction Thermal Plasma and Their Application in High Thermal Conductive Nanocomposites
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DOI：
10.1021/am5081887
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发表时间：
2015-02-04
影响因子：
9.5
通讯作者：
Yuan, Fangli
中科院分区：
文献类型：
--
作者：
Hou, Guolin;Cheng, Benli;Yuan, Fangli
本文利用射频（RF）热等离子体系统一步连续合成了尺寸均匀的α - si3n4纳米球。所有Si3N4纳米颗粒均呈现近乎完美的球形，尺寸分布较窄，并且通过改变进料速率可以很好地控制其直径。通过掺入合成的Si3N4纳米球，获得了致密的Si3N4/PR （PR =酚醛树脂）复合材料，该复合材料具有高导热性、优异的温度稳定性、低介电损耗正切线和增强的击穿强度。这些增强的性能是由于致密的氮化硅纳米球与聚合物基体具有良好的相容性和很强的界面附着力，大量的氮化硅纳米球可以均匀地分散在聚合物基体中，形成热流扩散的导热网络。
In this paper, single-crystalline alpha-Si3N4 nanospheres with uniform size of similar to 50 nm are successfully synthesized by using a radio frequency (RF) thermal plasma system in a one-step and continuous way. All Si3N4 nanoparticles present nearly perfect spherical shape with a narrow size distribution, and the diameter is well-controlled by changing the feeding rate. Compact Si3N4/PR (PR = phenolic resin) composites with high thermal conductivity, excellent temperature stability, low dielectric loss tangent, and enhanced breakdown strength are obtained by incorporating the as-synthesized Si3N4 nanospheres. These enhanced properties are the results of good compatibility and strong interfacial adhesion between compact Si3N4 nanospheres and polymer matrix, as large amount of Si3N4 nanospheres can uniformly disperse in the polymer matrix and form thermal conductive networks for diffusion of heat flow.