A method for preparing three-dimensional graphene by nanoparticle doping
A nanoparticle and graphene technology, applied in the field of nanomaterials, can solve problems such as insufficient connection between sheets, weak electrical conductivity, and inconspicuous spatial network structure, and achieve the effect of improving performance
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Embodiment 1
[0026] Three-dimensional graphene prepared by doping carbon nanotubes
[0027] Weigh 5 g of single-walled carbon nanotubes, and mix H with a volume ratio of 6:1 2 SO 4 / HNO 3 The ratio is 400mL of concentrated acid, carbon nanotubes and concentrated acid are condensed and refluxed at 150°C for 8 hours, and the solution is cooled to room temperature, and the acid is removed by vacuum filtration with a 0.45um polytetrafluoroethylene membrane, centrifuged and washed 4 times at 4000pm, at 80 Dry under vacuum for 12 hours. Weigh 1000mg of graphene oxide prepared by the Hummers method, dissolve it in 100mL of distilled water, dissolve and sonicate for 30min to prepare a 10mg / mL GO solution, add 600mgCNT and sonicate for 30min, stir for 12h, and put the evenly stirred solution into the reaction of polytetrafluoroethylene kettle, heated to 180°C, and reacted for 12 hours to obtain three-dimensional graphene cross-linked by graphene and carbon nanotubes. Its physical map and scanni...
Embodiment 2
[0029] Three-dimensional graphene prepared by doping curdlan
[0030] Weigh 800 mg of graphene oxide and dissolve it in 100 mL of distilled water for 30 min to prepare 8 mg / mL GO solution, add 800 mg of curdlan and stir well to make the solution gel. Put the gel solution into a 10mL reagent bottle and react at 200°C for 12h to obtain three-dimensional graphene crosslinked by curdlan gum and graphene oxide. Its physical map and SEM image are as follows figure 2 As shown, it can be seen from the figure that the curdlan particles are attached to the graphene sheet to form a three-dimensional network structure.
Embodiment 3
[0032] Three-dimensional graphene prepared by doping with silver ions
[0033] Weigh 1.7g of AgNO 3 1M AgNO 3 solution, weigh 0.56g of KOH to make 1M KOH solution, extract 10mL of AgNO 3 React with 15mL of KOH solution to form AgOH precipitate, add appropriate amount of ammonia water to dissolve AgOH and make silver amine solution in a 100mL volumetric flask. Dissolve graphene oxide in deionized water and ultrasonically disperse for half an hour to prepare a GO dispersion with a concentration of 15 mg / mL. Take 6 mL of a well-proportioned silver amine solution and disperse it in the graphene oxide solution, and stir for 24 hours. Add an appropriate amount of starch solution to reduce silver amine to form silver nanoparticles, put the solution of reduced graphene oxide plus silver nanoparticles into a polytetrafluoroethylene reactor, and react at 190°C for 12 hours to obtain a three-dimensional silver nanoparticle doped Graphene. Its physical map and SEM image are as follows...
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