Enhanced Thermal Conductivity of Nanodiamond Nanosheets/Polymer Nanofiber Composite Films by Uniaxial and Coaxial Electrospinning: Implications for Thermal Management of Nanodevices

摘要

Nanotechnologyis gradually applied to the preparationof heatdissipation materials with the miniaturization of electronic devices.Electrospinning technology has received extensive attention due toits unique advantages in constructing continuous nanofibers. In thiswork, uniaxial-polyvinyl alcohol/nanodiamond (U-PVA/ND) and coaxial-polyvinylalcohol/nanodiamond (C-PVA/ND) composite fiber films with differentmicroscopic morphologies were constructed by uniaxial and coaxialelectrospinning. The results show that the thermal conductivitiesof U-PVA/ND and C-PVA/ND composite fibers with 60 wt % ND contentare 71.3 and 85.3 W m(-1) K-1, respectively,which are 171.2 and 205.1 times greater than that of the pure PVAfiber film. In addition, the maximum thermal decomposition temperature(T (max)) and volume resistivity of the C-PVA/NDcomposite fiber film were 364.3 degrees C and 2.29 x 10(15) omega center dot cm, respectively, demonstrating the excellent thermalstability and electrical insulation of the composite fiber film. Thisexperiment results provide strong evidences of electrospinning technologyfor the preparation of highly thermally conductive composites. So,thermally conductive films can be used as the outer layer of electroniccomponents to accelerate their heat dissipation and extend their servicelife.

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