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通过配位反应,将镍离子引入酚醛树脂结构中,在惰性气氛保护下制备镍改性酚醛树脂,并将其分别在600、800、1000℃下进行碳化处理。XRD检测结果表明:600℃时热解碳出现明显的C(002)晶面衍射峰;当温度升高(800、1000℃)时,半峰宽增大,峰位左移,峰强度减小。SEM和TEM的检测结果表明,即使在1000℃下,普通酚醛树脂热解碳仍为无定形碳,而温度高于800℃后镍改性酚醛树脂热解碳中生成石墨烯,且升温和增大催化剂用量均有利于石墨烯生成。镍改性酚醛树脂炭化形成石墨烯的过程遵循“溶碳析碳机制”。
Through coordination reaction, nickel ions were introduced into the phenolic resin structure, and nickel-modified phenolic resin was prepared under the protection of inert atmosphere and carbonized at 600,800 and 1000 ℃. The results of XRD showed that the diffraction peak of C (002) crystal appeared obviously at 600 ℃, and the half peak width increased and the peak position shifted to the left when the temperature was increased (800 and 1000 ℃) . The results of SEM and TEM show that even at 1000 ℃, the pyrolytic carbon of ordinary phenolic resin is still amorphous carbon, and the pyrolytic carbon of nickel-modified phenolic resin produces graphene at the temperature higher than 800 ℃, Large amount of catalyst are conducive to the formation of graphene. The carbonization of nickel-modified phenolic resin to form graphene follows the principle of “carbon-dissolving carbon mechanism.”