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Chemically linked metal-matrix nanocomposites of boron nitride nanosheets and silver as thermal interface materials

机译：硼氮化硼纳米片和银作为热界面材料的化学连接的金属 - 基质纳米复合材料

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Herein, novel hybrid nanocomposite thermal interface materials (TIMs) relying on the chemical linkage of silver, boron nitride nanosheets (BNNSs), and organic ligands are reported. These TIMs were prepared using a co-electrodeposition/ chemisorption approach where the electrolytic reduction of silver ions into silver nano-/micro-crystals was coupled with the conjugation of ligand-coated nanosheets onto silver crystals. Furthermore, the influence of the bond strength of silver/nanosheet links on the thermal, mechanical, and structural properties is investigated using a combination of techniques including laser flash analysis, phase-sensitive transient thermoreflectance, nanoindentation, and electron microscopy. The internal nanostructure was found to be strongly dependent on the linker chemistry. While the chemical grafting of 4-cyanobenzoyl chloride (CBC) and 2-mercapto-5-benzimidazole carboxylic acid (MBCA) on BNNSs led to the uniform distribution of functionalized-nanosheets in the silver crystal matrix, the physical binding of 4-bromo-benzoyl chloride linkers on nanosheets caused the aggregation and phase separation. The thermal conductivity was 236-258 Wm(-1) K and 306-321 Wm(-1) K for physically and chemically conjugated TIMs, respectively, while their hardness varied from 400-495 MPa and from 240 to 360 MPa, respectively. The corresponding ratio of thermal conductivity to hardness, which is a critical parameter controlling the performance of TIMs, was ultrahigh for the chemically conjugated TIMs: 1.3 x 10(-6) m(2) K-1 s for MBCA-BNNS and 8.5 x 10(-7) m(2) K-1 s for CBC-BNNS. We anticipate that these materials can satisfy some of the emerging thermal management needs arising from the improved performance and efficiency, miniaturization, and/or high throughput of electronic devices, energy storage devices, energy conversion systems, light-emitting diodes, and telecommunication components.
机译：在此，据报道，依赖于银，氮化硼纳米片（BNNSS）和有机配体的化学键的新型杂化纳米复合材料热界面材料（TIMS）。使用具有共电沉积/化学吸附方法制备这些时间的时间，其中银离子的电解还原到银纳米/微晶中与配体涂覆的纳米片的缀合到银晶体上。此外，使用包括激光闪光分析，相敏瞬时热反射，纳米狭窄和电子显微镜的技术的组合，研究了银/纳芯链路对热，机械和结构性能的影响。发现内部纳米结构强烈依赖于接头化学。虽然在BNNS上的4-氰基苯甲酰氯（CBC）和2-巯基-5-苯并咪唑羧酸（MBCA）的化学接枝导致银晶基质中官能化纳米片的均匀分布，4-溴 - 的物理结合 - 纳米蛋白酶上的苯甲酰氯接头导致聚集和相分离。对于物理和化学缀合的时间，热导率为236-258Wm（-1）k和306-321Wm（-1）k，而它们的硬度分别从400-495MPa和240至360MPa变化。热导率与硬度的相应比例是控制TIMS性能的关键参数，是用于MBCA-BNNS和8.5 x的化学缀合的时间的超高：1.3×10（ - 6）m（2）k-1 s用于CBC-BNN的10（-7）M（2）k-1s。我们预计这些材料可以满足来自电子设备，能量存储装置，能量转换系统，发光二极管和电信组件的提高性能和效率，小型化和/或高吞吐量产生的一些新兴的热管理需求。

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