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中国科学家发明石墨烯快速制备方法 - 站长搜索
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中国科学家发明石墨烯快速制备方法

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2015-02-05 09:12:06 转载来源: 网络整理/侵权必删

站长搜索( www.adminso.com):中国科学家发明石墨烯快速制备方法 被喻为“工业界新宠”的石墨烯是近年来备受关注的热点材料,一直没有快捷而安全的工业制备方法。浙江大学高分子系的高超教授课题组找到一条适用于大规模制备的“绿色路线”,使单层石墨烯一小时成形,效率提高十倍以上

站长搜索( www.adminso.com):中国科学家发明石墨快速制备方法

被喻为“工业界新宠”的石墨烯是近年来备受关注的热点材料,一直没有快捷而安全的工业制备方法。浙江大学高分子系的高超教授课题组找到一条适用于大规模制备的“绿色路线”,使单层石墨烯一小时成形,效率提高十倍以上。

石墨烯是由一层碳原子形成的薄片,由碳原子组成一个个六角形的环,环环相连形成蜂窝状平面。这是目前世上最薄也是最坚硬的纳米材料。一层石墨烯的薄度小于一个纳米,肉眼看不见也摸不着,20万片石墨烯加在一起,才有一根头发丝那么粗。

高超介绍,目前制备石墨烯的方法主要有机械剥离法、氧化还原法等。机械玻璃法的局限性在于,所得产物为不同层数石墨烯的混合物,难以大规模制备单层石墨烯;氧化还原法普遍使用氯系和锰系的氧化剂,制备时间长达十余个小时,会产生有毒气体和重金属污染,氧化锰等中间体也容易发生爆炸。

课题组经过多年探索,发现了一种新型、廉价、无毒的铁系氧化剂,取代了沿用半个多世纪的氯系、锰系氧化剂。

“这种铁氧化剂分子的‘奔跑’速度很快,能像楔子一般,快速穿插进入石墨内部,让石墨很快分层。这一过程中会产生氧气,帮助‘顶’开层层石墨,让制备速度加快。”高超说,这种方法没有爆炸隐患,不会产生有害物质,对环境友好。同时,这种方法做单层氧化石墨烯,在一个小时之内就能完成,令石墨烯在工业上的大规模应用成为可能。

相关论文1月21日发表在《自然》杂志子刊《自然通讯》杂志上。此前,该课题组已经运用石墨烯为原材料制备出石墨烯纤维、石墨烯气凝胶、石墨烯薄膜等多种形态的宏观材料。这些高强、高韧、高电导的石墨烯材料有望广泛运用于移动设备、航空航天、新能源电池等多个领域。

标签: 中国 科学家 发明 石墨 快速 制备 方法


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