6 results about "Carbon film" patented technology

A method for reforming an amorphous carbon film as part of a deposition process thereof, includes process of: (i) depositing an amorphous carbon film on a substrate in a reaction space until a thickness of the amorphous carbon film reaches a predetermined thickness, and then stopping the deposition process; and (ii) exposing the amorphous carbon film to an Ar and/or He plasma in an atmosphere substantially devoid of hydrogen, oxygen, and nitrogen.

The invention relates to a method for coating an even and controllable deposit carbon layer on the surface of LiFePO4 particles serving as lithium ion battery cathode materials for increasing the LiFePO4 conductivity. The method adopts the concrete preparation processes that: LiFePO4 powders are placed in a constant temperature zone of a chemical vapor deposition furnace, then the air in the furnace is fully discharged for inputting inert gases, after the temperature rises to the set level, a carbon source gas is input for covering a conductivity carbon film on the surface of the LiFePO4 particles evenly, the LiFePO4 coated with the carbon film has excellent conductivity which is increased by five orders of magnitude compared with the condition before coating. The chemical vapor deposition temperature ranges from 580 to 720DEG C, the deposition time is from 1 to 10 hours, and the volume percent of the carbon source gas is between 1 and 20 percent, and a sample deposited with carbon is cooled to the room temperature with a natural furnace and is then taken out. The method can cover the conductivity carbon film on the surface of each LiFePO4 particle evenly for increasing the conductivity of LiFePO4, and the thickness of the conductivity carbon film can be accurately controlled in the range of 2 to 50 nanometers through adjusting parameters (deposition temperature, deposition time and carbon source gas volume percent) of the chemical vapor deposition process.

A slider of the invention includes a substrate, a head element formed on the substrate and a protecting film formed on at least one portion of one surface of the substrate facing a magnetic recording medium. The protecting film comprises a base film, first DLC (diamond like carbon) film adjacent the substrate and a second DLC film. The carbon film density of said first DLC film is less than 3.1 (g/cm3) and the carbon film density of said second DLC film is more than 3.1 (g/cm3).

The invention discloses an Ni film annealing patterned graphene preparation method based on 3C-SiC/chlorine gas reaction, which mainly solves the problem that the graphene prepared by the prior art can cause damage and result in electron mobility reduction when being used for photoetching technology as a transistor channeling material. The preparation method comprises the following steps: (1) growing a carbonization layer on an Si substrate as a transition layer; (2) growing a 3C-SiC film on the carbonization layer; (3) depositing SiO2 on the surface of the 3C-SiC film, and etching a pattern on the SiO2; (4) reacting the patterned sample wafer with Cl2 to generate a carbon film; (5) removing the SiO2 except the pattern; (6) depositing an Ni film on the carbon film by using an electron beam; and (7) putting the sample wafer with the deposited Ni film in Ar gas, and annealing for 15-30 minutes so that the carbon film reconstitutes the patterned graphene in the pattern position. The invention has the advantages of simple technique and high safety; the graphene can be directly used as a conducting channel without photoetching when making a transistor on the graphene; and the graphene can be used for making graphene transistors with superhigh mobility.

The invention provides a preparation method of a porous high-load electrode for a lithium-sulfur battery. The preparation method comprises the following steps: 1) preparing an electrode manufacturing material into a sulfur-carbon film layer by using a rolling process, wherein the electrode manufacturing material comprises a sulfur-carbon mixture containing sublimed sulfur, a conductive agent and NH4HCO3; and 2) placing an aluminum net between two sulfur-carbon film layers, and rolling and laminating to prepare a high-load electrode; and then removing NH4HCO3 in the sulfur-carbon film layers through hot drying treatment, and forming an ion channel in the high-load electrode to obtain the porous high-load electrode. The pore-forming agent NH4HCO3 is introduced in the preparation process of the high-load electrode, the ion channel with a proper pore diameter is reserved in the high-load electrode by utilizing a gasification reaction of thermal decomposition of the pore-forming agent NH4HCO3, the ion channel plays an important role in improving the wettability of an electrolyte and improving the ion transmission efficiency in a battery reaction, and the overall energy density of the lithium-sulfur battery can be improved by 2-3 times.