Abstract
Carbon nanotube (CNT) arrays with aligned growth orientation and sponge CNTs which consist of flocculent carbon fibers with tiny CNTs on their surface were synthesized by chemical vapor deposition. Heat sinks based on CNT arrays or sponge CNTs were made to investigate their heat dissipation performance. It is found that their microstructures have strong impacts on the thermal performance by changing the coefficient of air convection. The long CNT arrays have good heat dissipation performance even under natural convection for its aligned structure and large contacting area with the air, while the sponge CNTs show larger improvement in heat dissipation ability under airflow due to their porous structure. The results give a good reference for developing low-cost, light-weight, and high-performance CNT-based heat sinks for chip cooling under different working conditions.
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