Preparation of micron-sized carbon nanowalls-grown spherical carbon particles by thermal chemical vapor deposition with a tungsten mesh heater and alcohol

Abstract

This report presents a simple, low-cost thermal chemical vapor deposition method using alcohol as a carbon source for producing micron-sized carbon nanowalls (CNWs) on spherical carbon particles. The obtained CNWs have structural disorder and defects, as indicated by a low I_G/I_D (the ratio of the D-band peak to the G-band peak) ratio in the Raman spectrum. It is worth noting that the height and width of the CNWs reach approximately 10 µm, making them larger than previously reported CNWs. CNWs are produced at 730°C when using a tungsten mesh heater, while submicron-sized amorphous carbon grains are produced with a tungsten plate heater. However, CNWs are not produced at 800°C, even with a tungsten mesh heater. The reason why CNWs are not produced at 800°C remains unclear; however, their growth at 730°C is attributed to the preferential production of sp² carbon.