Fabrication Of Boron-doped Diamond Electrode And The Related Numerical Simulation Of Electric Field

Diamond is a semiconductor material having various excellent properties whichcan be prepared by incorporation of boron to a boron-doped diamond film with P-typeconductivity. Because of having the advantages of wide potential window, lowbackground current, low adsorption characteristics and high chemical inertness,boron-doped diamond film is widely used as an electrode in the field ofelectrochemistry. In this thesis, the boron-doped diamond film electrode has beeninnovatively used in the field of biology, and its application in agarose gelelectrophoresis has been studied.In this thesis, hot filament chemical vapor deposition (HFCVD) was used tofabricate the boron-doped diamond film. The quality and the electrochemicalperformance of the film have been analyzed by scanning electron microscopy, Ramanspectroscopy, X-ray diffraction and cyclic voltammetry. The results showed that thediamond films obtained has been effectively boron doped, and its crystalline was fine.the electrochemical performance of the diamond film is better than the platinum wireelectrode of the conventional electrophoresis.The electric field distribution in the electrophoresis tank with the rectanglediamond film as the electrode was simulated by the finite element numerical analysis,and the difference of the electric field distribution between the platinum wireelectrode and the diamond film electrode was compared. For the commercialelectrophoresis tank, which has a convex bottom, the electric field intensity anduniformity of the central region of the electrophoresis tank will be increased becauseof the convex portion, but the electric field in other regions will result in deterioration of uniformity. In the same electrophoresis tank, the intensity of the diamond filmelectrode-related electric field is larger than that of the platinum wire electrode. Bycomparing the electric field distribution of the new electrophoresis tank using thediamond film electrode and the commercial electrophoresis tank using the platinumwire electrode, it indicates that the electric field intensity of the new electrophoresistank using the diamond film electrode is not only much higher than that of thecommercial electrophoresis tank using the platinum wire electrode, but also moreuniform.Finally, the feasibility of the boron-doped diamond film being an electrode in theelectrophoresis was verified by agarose gel electrophoresis. The results showed thatthe diamond film electrode can not only replace the traditional platinum wireelectrode, but can also get more desirable results. The diamond film electrode can beeasily cleaned and reused, while the traditional platinum wire electrode cannot.