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前沿技术——原子级精度可控折叠石墨烯纳米结构

Release time:

2020-04-29 08:34

Source:

公众号：蓝海星智库

中科院物理所的研究人员首次实现了原子级精度的石墨烯纳米结构的可控折叠，构建出新型的准三维石墨烯纳米结构。

石墨烯纳米结构的可控折叠示意图

折纸工艺已被广泛应用于建筑、电池设计和DNA纳米制造等领域，并在三维石墨烯结构和器件的制备和模拟方面表现出显着潜力。但是，石墨烯弯曲结构的电学性能易受空位、边界等缺的影响，如何在单原子尺度精确折叠石墨烯成为目前的一大挑战。研究人员以高度有序的热解石墨为基底，用扫描隧道电子显微探针对其上的石墨烯纳米岛进行原子级精度的可控折叠和展开，构造出扭转角可调的双层石墨烯堆垛结构，并形成界面分明的异质结。研究发现，调整折叠方向可得到扭转角达60°、精度为0.1°的双层石墨烯，其独特之处在于层与层之间通过管状纳米结构边缘连接。利用扫描隧道电子显微镜和第一性原理确定了折叠后石墨烯的原子结构和局域化电子态，并证实异质结具有不同的能带结构。

这种方法有望用于其他二维原子晶体材料，将促进量子材料和量子器件的发展。

可控,石墨,结构,纳米,折叠,原子,精度,三维,研究人员

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