Thermal Conductivity of Electrophoresis Deposition Fabricated Nanodiamond Arrays: Size and Electrolyte Effects

摘要

Nanodiamond, which has high biological compatibility, superior optical property, as well as excellent thermal conductivity can be applied in different fields, such as biomedicine, UV detector, thermal interface material. Natural single diamond has the highest thermal conductivity (2,200 W/(m?K) at 298.15K) among all the bulk material. However, different with single diamond, nanodiamond (ND) producing by explosion or high temperature and high pressure (HPHT) method has much smaller size (6nm-100nm) compared to bulk diamond which showed different thermal property. Thermal conductivity of nanodiamond produced by explosion is demonstrated to be less than 10 W/(m?K) because of the surface graphite. Unlike single nanodiamond particles and nanodiamond thin film, well-defined 1D nanodiamond array has its orientation effect which shows different heat dissipation behavior. In this paper, 6nm and 100nm nanodiamond are used as raw materials to fabricate free standing nanodiamond arrays by a template-based electrophoresis deposition method. And three different electrolytes are used during the electrophoresis deposition process: acetonitrile, water, and dimethyl sulfoxide. The motivation in most of the recent studies are increasing the thermal conductivity of nanodiamond arrays instead of revealing the factors of thermal conductivity, electrolyte especially. This study tries to improve the understanding of how electrolyte and particle properties would influence the thermal property of the arrays.