In this study, carbon nanofibers were synthesized on iron and copper catalysts by Chemical Vapor Deposition (CVD). Investigation was made with respect to variation on thickness and surface of fibers based on concentration of iron and copper. In order to prepare metal catalysts of respective synthesis, iron nitrate and copper nitrate were calculated in proportion to weight ratio and then dissolved into distilled water. Obtained catalyst precipitates were filtered and then dried for more than 24 hours at 110°C. Carbon nanofibers were composed by using ethylene gas of carbon source through CVD after pulverization of fully dried catalyst precipitates. Analysis through SEM was made in order to investigate structural characteristics of composed carbon nanofibers, and qualitative and quantitative analyses were conducted on elements through EDS. In addition, crystalline analysis was made on carbon nanofibers through XRD and Raman, and specific surface area measurement was carried on carbon nanofibers composed through BET.

Carbon nanomaterials, such as carbon nanotubes (CNTs) and graphene, have attracted significant attention as good candidates for next-generation heat-spreading materials because of their high thermal conductivity, mechanical flexibility, etc. Regarding the thermal spreading performance of carbon-based nanofilms, remarkable test results have been reported mainly from the industrial side, but their validity and the physical mechanism underlying the heat transfer enhancement are still under debate. In this study, we assess the thermal spreading performance of a multi-walled CNT film on a copper foil using a non-contact characterization method in a simple and methodical manner, and discuss the possibility of carbon nanofilms as heat spreaders based on the experimental and numerical results. This study provides useful information on heat transfer enhancement by carbon nanofilms and could contribute to the development of high-performance carbon-based heat-spreading coatings.