High-electrical-resistivity thermally-conductive phase change materials prepared by adding nanographitic fillers into paraffin

作者：Wu Chia Hung; Pu Nen Wen^*; Liao Chia Wei; Wu Bo Rong; Liu Yih Ming; Ger Ming Der

来源：Microelectronic Engineering, 2015, 138: 91-96.

DOI：10.1016/j.mee.2015.02.039

• Exfoliated graphite nanoplatelets
• Thermal conductivity
• High electrical resistivity
• Phase change materials

We added exfoliated graphite nanoplatelets (xGnPs) as a filler into paraffin phase change materials (PCMs) to significantly improve the poor thermal conductivity of paraffin and enhance the heat transfer rate of the PCM. However, the electrical resistivity of paraffin was reduced from above 10(12) Omega-cm to below 10 Omega-cm due to the high electrical conductivity of the added carbon fillers. For applications in electrical devices, such a low resistivity is undesirable since it might cause a short-circuit problem. In order to solve this problem, the xGnPs were thus modified by an acid treatment, which strongly oxidized the surface. The electrical resistivity of the PCM filled with the modified xGnPs (M-xGnPs) was significantly raised by up to 11 orders of magnitude while the thermal conductivity was not severely compromised. This method can improve the safety and usefulness of nanographite-filled PCMs when applied to electrical systems.

• 出版日期2015-4-20
• 单位中国人民解放军国防大学