Method for Electrodepositing Carbon Film in Supercritical Carbon Dioxide

Abstract

The invention provides a method for electrolytic deposition of a carbon film in super-critical carbon dioxide. The method is conducted on the basis of a super-critical carbon dioxide (scCO2) technique, an electrolyte comprises scCO2, a co-solvent and tetrabutylammonium hexafluorophosphate, and the smooth and uniform carbon film is prepared on a stainless steel substrate. The method for electrolytic deposition of the carbon film comprises steps as follows: oxides on the surface of stainless steel are removed, then the stainless steel is washed clean to serve as a cathode of the deposited carbonfilm, a washed platinum sheet serves as an anode, the stainless steel and the platinum sheet are assembled, and the electrode spacing is controlled properly; the prepared electrolyte is added to an inner container, then the inner container is put into a reaction kettle, the reaction kettle is closed, CO2 flows into the reaction kettle, and the temperature and the pressure of the reaction kettle are set; after the pressure and the temperature of the reaction kettle reach set values and keep for 30 min, and electrolytic deposition is conducted under the voltage of 3-20 V for 30-120 min; the electrode is taken out, washed clean and dried after the experiment is finished. The prepared carbon film is smooth and uniform and has good substrate binding force.

Description

technical field [0001] The invention relates to the field of surface treatment, in particular to a novel carbon film preparation technology by electrodeposition. Background technique [0002] Carbon-based thin-film materials have aroused widespread research upsurge because of their excellent properties, because of their chemical inertness, high hardness, low friction and high thermal conductivity, they are considered to be important materials for applications such as electronics, optics and wear protection, and become a material surface Address hot issues of concern in the research field. At present, most electrodeposition methods to prepare carbon films require high temperature or high voltage, and at the same time, the film quality is low and the deposition rate is slow; while a small number of carbon films prepared by low-voltage electrodeposition are in organic aqueous solution, which has serious hydrogen evolution problems. . In view of the above problems, the present...

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Problems solved by technology

At present, most electrodeposition methods to prepare carbon films require high temperature or high voltage, and at the same time, the film quality is low and the deposition rate is slow; while a small number of carbon films prepared by low-voltage electrodeposition are in organic aqueous solution, which has serious hydrogen evolution problems.

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