Papers by Author: Bin Yuan Zhao

Abstract: Porous carbon monolith was used as substrate for microwave plasma chemical vapor deposition. The depositing time was set as 1 hour, 3hours, and 5 hours respectively. The deposited samples were characterized with Raman spectroscope and scanning electron microscope. It was proved that diamond was formed on the surface of all the samples. However, the surface morphology and phase composition of the chemical vapor deposition layer changed with depositing time. It was deduced that the porous carbon monolith was a carbon resource, and it gave out small molecules containing carbon element during the deposition. This changed the ratio of carbon to hydrogen in the growing atmosphere, and correspondingly influenced the growth of carbon on the substrate. With a low ratio of carbon to hydrogen, mainly diamond grew. Or else, other types of carbon would grow on the surface of the porous carbon monolith substrate.

Abstract: The electrochemical behavior of a boron-doped diamond film electrode prepared by chemical vapor deposition was studied. The surface microstructure of the electrode was studied by means of scanning electron microscopy. The electrochemical behavior of the electrode was investigated by cyclic voltammetry and AC Impedance. The diamond films exhibited a “cauliflower-like” morphology and contained microcrystallites. The results showed the electrode having a very wide potential window and very low background current. The potential windows in acidic, neutral or alkaline medium were respectively 4.4[V], 4.0[V] and 3.0[V]. The background current was as low as -8×10-6～5×10-7[A]. In the electrolyte including Ferri/Ferrocyanide, the electrode surface kept good activity, and the electrochemical reaction occurring on the surface was a diffusion-controlled reaction, with good quasi- reversibility. Compared with Pt and graphite electrodes, diamond electrodes can oxidize compounds like phenol effectively, and the process of oxidization was very simple and complete.

Abstract: In this paper, porous carbon was made from biomass derived carbonaceous mesophase and carbonaceous fillers, and further applied as the substrate for CVD grow of nano carbon materials. With the assistance of microwave plasma, the acetone gas was decomposed into carbon and grew on the surface of the porous carbon, which produce ballas diamonds, carbon tubes, nets, petal, and other structures.