Preparation and characterization of carbon nano-sheet powders

Abstract

Carbon nanosheet fi lms were deposited on Al substrates by using plasma assisted chemical vapor deposition (PACVD) technique. And after being peeled off from Al substrates, carbon nanosheet powders (CNSPs) were obtained. In Raman spectrum of carbon fi lm, there was a strong and broadened peak at about 1,580 cm -1 , indicating a carbon diamond-like fi lm. Atomic force microscope image showed that the carbon diamond-like fi lm had a grain size less than 100 nm, and its surface roughness Ra was 17.95 nm in an area of 5×5 m 2 . The CNSPs were irregular sheets with curly edges and a length of several micrometers to several hundreds of micrometers. The BET surface area of CNSPs was 6.66 m 2 /g with no micro-pore present, which was confi rmed by N 2 adsorption-desorption characterization. In the adsorption testing, when the relative pressure p/p 0 was higher than 0.3, the adsorption behavior did not follow the Langmuir equation. The addition of CNSPs to carbon black (catalyst support) could improve hydrodesulfurization performance of carbon supported Ni-W catalysts for diesel oil.