Conductive carbon film based on graphene as well as preparation method and application
A conductive carbon film, graphene technology, applied in conductive coatings, chemical instruments and methods, nanotechnology for materials and surface science, etc. , to achieve the effect of simple process, easy heat dissipation and low cost
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Embodiment 1
[0029] Example 1: Universal conductive carbon film based on single-layer graphene
[0030]Single-layer graphene was prepared by chemical oxidation method. 10 g of graphite and 7 g of sodium nitrate (analytical pure) were added to the flask, and then 500 mL of concentrated sulfuric acid (analytical pure) was added. Afterwards, in an ice-water bath, slowly add 40 g of potassium permanganate while stirring, and the addition time is controlled at 2 hours, and then kept for 2 hours to cool down to room temperature. After stirring at room temperature for 10 days, the reaction solution first turned green, then dark brown, and finally brick brown, and became viscous. The reaction solution was slowly added to 1000 mL of 5 wt % dilute sulfuric acid, the addition time was controlled at 2 h, stirring was kept, and the temperature was controlled at 98°C. The reaction solution was stirred at this temperature for another 2 h, and then cooled to 60 °C. Add 30 mL of hydrogen peroxide (30% a...
Embodiment 2
[0034] Example 2: Transparent conductive carbon film based on single-layer graphene
[0035] Single-layer graphene was prepared according to the method of Example 1. Add 1 g of single-layer graphene into water, and process it with 500W ultrasonic wave for 30 minutes to completely dissolve it.
[0036] The single-layer graphene aqueous solution is formed into a film on the surface of the cleaned quartz plate (15×15×3mm) by the method of spin coating, and placed at room temperature for 48h; then the single-layer graphene film loaded on the quartz plate is placed in an airtight container , fumigated with hydrazine hydrate (98%, Alfa Aesar) steam for 24h; a single-layer graphene film reduced by hydrazine steam was obtained. The single-layer graphene film reduced by hydrazine vapor was placed in a tube furnace, and baked at 400°C for 3 hours under the protection of nitrogen to obtain a transparent and conductive single-layer graphene carbon film; in addition, the hydrazine vapor r...
Embodiment 3
[0039] Example 3: Multilayer Graphene-based Universal Conductive Carbon Film
[0040] Multilayer graphene was prepared according to the method reported in the literature (Carbon, 2004, 42, 2929), and the obtained product was centrifuged to obtain a mixture of 2-5 layers of graphene. Add 1 g of multilayer graphene into water, and process it with 500W ultrasonic wave for 60 minutes to completely dissolve it. 0.5 g of sodium borohydride was added, stirred, and reacted at 80° C. for 2 h, the solution turned from brown to black, and a reduced graphene dispersion was obtained.
[0041] The above-mentioned graphene dispersion is formed into a film on the surface of the cleaned glass substrate (10×10cm) by pouring, and placed at room temperature for 48h, and then the graphene film loaded on the glass substrate is placed under nitrogen protection at 400 ° C. Roasting 3h, obtains the conductive multilayer graphene carbon film, and its conductivity is 2×10 2 S / cm.
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