Preparation method of graphene thin film field emission material
A graphene thin film and field emission technology, applied in electrolytic coating, electrophoretic plating, coating, etc., can solve the problems that hinder the application of graphene and lack of preparation methods, and achieve low cost, good controllability, and easy scale-up Effect
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[0025] Example 1
[0026] The device is attached figure 2 b, the stainless steel plate 1 is connected to the positive electrode of the power supply, the ITO glass 3 is connected to the negative electrode of the power supply, the graphene solution 2 is placed in a polymethyl methacrylate (PMMA) plastic container 4, and the stainless steel plate 1 and the ITO glass 3 are respectively inserted into the graphene solution 2 in.
[0027] The lateral dimension prepared by chemical peeling method is 500nm~1μm, the number of layers is 1~3 (thickness is about 0.8~2.3nm), and the conductivity is 1×10 3 S / cm graphene as raw material, graphene and Mg(NO 3 ) 2 It was added to the low-polarity organic solvent isopropanol (IPA) at a weight ratio of 1:1, and the concentration of graphene was 0.1 mg·mL -1 , ultrasonically dispersed at room temperature for 1 h to obtain a uniform and stable graphene suspension; a polished stainless steel plate was used as the positive electrode (5 cm × 2 cm...
Example Embodiment
[0029] Example 2
[0030] The device is attached figure 2 b.
[0031] The lateral dimension prepared by chemical peeling method is 500nm~1μm, the number of layers is 1~3 (thickness is about 0.8~2.3nm), and the conductivity is 1×103 S / cm graphene as raw material, graphene and Mg(NO 3 ) 2 It was added to the low-polarity organic solvent isopropanol (IPA) at a weight ratio of 2:1, and the concentration of graphene was 0.2 mg·mL -1 , ultrasonically dispersed at room temperature for 2 h to obtain a uniform and stable graphene suspension; a polished stainless steel plate was used as the positive electrode (5 cm × 2 cm × 2 mm), and a conductive glass (2 cm × 1 cm × 2 mm) as the negative electrode, the distance between the positive and negative electrodes is 10 mm, the operating voltage is 150 V, and the electrophoretic deposition time is 2 min to prepare a graphene film with a thickness of about 1 μm; the electrophoretic deposition film (1 cm × 1 cm × 2 mm) is used as a cold Cat...
Example Embodiment
[0033] Example 3
[0034] The device is attached figure 2 b.
[0035] The lateral dimension prepared by chemical peeling method is 500nm~1μm, the number of layers is 1~3 (thickness is about 0.8~2.3nm), and the conductivity is 1×10 3 S / cm graphene as raw material, graphene and MgCl 2 It was added to the low-polarity organic solvent dimethylformamide (DMF) at a weight ratio of 1:1, and the concentration of graphene was 0.1 mg·mL -1 , ultrasonic dispersion at room temperature for 1 h to obtain a uniform and stable graphene suspension; a polished stainless steel plate is used as the positive electrode (5 cm × 2 cm × 2 mm), and a conductive glass (2 cm × 1 cm) is covered with an indium tin oxide (ITO) coating with a thickness of 200 μm. ×2mm) is the negative electrode, the distance between the positive and negative electrodes is 5mm, the operating voltage is 100V, the electrophoretic deposition time is 2min, and a graphene film with a thickness of about 0.5 μm is prepared; Cat...
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