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Boosted thermal conductance of polycrystalline graphene by spin-coated silver nanowires

机译:旋涂银纳米线提高了多晶石墨烯的导热性

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Spin-coated silver nanowires (AgNWs) on graphene show a significantly improved thermal conductance of the composite in comparison with pristine graphene with no nanowires. CVD-synthesized graphene is transferred onto an 8-nm thin TEM grid substrate, and AgNWs (average diameter 150-nm and average length 30-mu m) are chemically grown from an AgNO3 reagent solution. The AgNW bridging overrides the negative effect of the grain boundary scattering of the electron/phonon energy carriers propagating in the polycrystalline CVD graphene and ultimately enhances the grain-to-grain heat transport by widening their passages. This boosting contribution of AgNWs is quantitatively assessed by measurement of thermal conductance for synthesized AgNW/graphene composite samples. The Raman thermometry measurement locations are selected to be beside a single AgNW (G-1), two AgNWs (G-2), and three or more AgNWs (G-3), so that the effect of AgNW density can be examined. The average enhanced thermal conductance values for the three AgNW-laid graphene samples are 319.27 nW/K, 343.66 nW/K, and 455.26 nW/K, respectively. (C) 2019 Elsevier Ltd. All rights reserved.
机译:与没有纳米线的原始石墨烯相比,石墨烯上的旋涂银纳米线(AgNWs)显示出复合材料的导热性显着提高。将CVD合成的石墨烯转移到8nm的薄TEM栅格基板上,然后从AgNO3试剂溶液化学生长AgNW(平均直径150nm,平均长度30μm)。 AgNW桥接克服了在多晶CVD石墨烯中传播的电子/声子能量载体的晶界散射的负面影响,并通过加宽了它们的通道最终增强了晶粒间的热传输。通过测量合成的AgNW /石墨烯复合材料样品的热导率,可以定量评估AgNWs的这种促进作用。拉曼测温法的测量位置选择在单个AgNW(G-1),两个AgNW(G-2)和三个或更多AgNW(G-3)旁边,以便可以检查AgNW密度的影响。三个AgNW铺设的石墨烯样品的平均增强导热系数分别为319.27 nW / K,343.66 nW / K和455.26 nW / K。 (C)2019 Elsevier Ltd.保留所有权利。

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