Method for preparing graphene through combustion synthesis by virtue of macromolecular polymers
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A high-molecular polymer, combustion synthesis technology, applied in the field of carbon materials, can solve the problems of high cost, loss, product transfer, etc., and achieve the effect of various varieties, cheap prices, and convenient storage and transportation
Active Publication Date: 2015-09-02
HARBIN INST OF TECH
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At present, there are many methods for preparing graphene, the main ones are: mechanical exfoliation method, redox method, epitaxial growth method and chemical vapor deposition (CVD), etc., but these methods have their own advantages and disadvantages, for example: mechanical exfoliation method to obtain Graphene has a simple process, low cost, good quality, and small thickness, but the output is too small to be suitable for industrial production; the graphene oxide obtained by the redox method has good dispersion and can be prepar
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specific Embodiment approach 1
[0022] Specific embodiment one: according to mass fraction, take by weighing the magnesium powder that diameter is 1mm, 16.1%, the polyvinyl chloride powder of 83.9%, fully mix, in CO 2 Under the atmosphere, heat and ignite with a resistance wire, carry out a combustion synthesis reaction, and obtain a crude product powder containing graphene, weigh the crude product powder containing graphene, pickle with a 15% HCl aqueous solution with a mass fraction, and then use Rinse with ionized water to obtain pure graphene powder, its SEM image is as follows figure 1 shown.
specific Embodiment approach 2
[0023] Specific embodiment two: according to mass fraction, take by weighing the magnesium powder of 0.5mm, 18.3%, the phenolic resin powder of 81.7%, fully mix, in CO 2 In the atmosphere, ignite with a igniter, carry out a combustion synthesis reaction, and obtain a crude product powder containing graphene, weigh the crude product powder containing graphene, pickle with a HCl aqueous solution with a mass fraction of 30%, filter and then Rinse with deionized water to obtain pure graphene powder, its SEM image is as follows figure 2 shown.
specific Embodiment approach 3
[0024] Specific embodiment three: according to the mass fraction, take the magnesium powder that is 2mm, 22.4%, the poly(superchloride vinyl chloride powder) of 77.6% by weighing according to the mass fraction, fully mix, in Ar and CO 2 In the mixed gases each accounting for 50%, heat and ignite with a resistance wire, carry out a combustion synthesis reaction, and obtain a crude product powder containing graphene, pickle with an aqueous HCl solution with a mass fraction of 20%, and then rinse with deionized water to obtain Pure graphene powder, its SEM picture is as follows image 3 As shown, the TEM image is shown in Figure 4 shown.
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Abstract
The invention provides a method for preparing graphene through combustion synthesis by virtue of macromolecular polymers. The method for preparing graphene through combustion synthesis by virtue of the macromolecular polymers comprises the following steps: firstly, weighing 10-65wt% of magnesium powder and 35-90% of macromolecular polymers, and uniformly mixing; secondly, putting the mixture obtained in the step 1 in protective atmosphere, igniting the mixture by adopting an igniting agent or through resistance wire heating, and carrying out combustion synthesis reaction, so that crude product powder containing graphene is obtained; and thirdly, purifying the crude product powder obtained in the step 2 for removing impurities containing magnesium, so that pure graphene is obtained. The obtained graphene has special morphologies such as a petal shape, a fold shape, a hollow spherical shape and a scaly shape, the obtained graphene is doped with nitrogen, or fluorine, or boron, or boron and nitrogen, and number of layers is less then 10, so that the obtained graphene is convenient for industrial production and can be applied to the fields of composite materials, energy storage batteries, super capacitors, electronic devices, catalyst carriers, sensitive devices and the like.
Description
technical field [0001] The invention belongs to the technical field of carbon materials, and relates to a method for preparing graphene materials from various high-molecular polymers through a self-propagating high-temperature synthesis method. Background technique [0002] Graphene refers to sp 2 Hybridized single-layer graphite sheets with a thickness of only one atomic layer and a honeycomb crystal structure. In single-layer graphene, each carbon atom communicates with surrounding carbon atoms through sp 2 Hybridization into bonds to form regular hexagons. The thickness of single-layer graphene is only 0.335nm, which is the thinnest and hardest nano-material known in the world. Graphene has excellent mechanical, thermal, optical and electrical properties. It is the material with the highest strength and hardness among the known materials, and its tensile strength and elastic modulus are 125GPa and 1.1TPa respectively; the thermal conductivity at room temperature is 5×...
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