Laser-induced disassembly of a graphene single crystal into a nanocrystalline network
Laser-induced disassembly of a graphene single crystal into a nanocrystalline network
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DOI：
10.1103/physrevb.79.165428
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发表时间：
2009-04-01
影响因子：
3.7
通讯作者：
Smet, J. H.
中科院分区：
文献类型：
--
作者：
Krauss, B.;Lohmann, T.;Smet, J. H.
我们报告的时间依赖性的结构修改的单晶石墨烯由于激光照射，即使在中等功率水平的1 mW的衍射限制点的调查。的修改，其特征在于原位扫描共聚焦拉曼光谱，原子力高度显微镜，和运输研究。拉曼光谱的时间演变揭示了两种不同的效果：在短时间尺度上，最初存在于薄片上的掺杂剂被去除。较长的时间尺度行为指向激光诱导的单晶石墨烯逐渐局部分解成互连纳米石墨的网络，由于键断裂，其特征长度尺度为约10 nm。断裂的债券提供额外的对接网站的吸附物运输和AFM高度的研究证实。这些受控的结构修饰例如对于增强局部反应性、修整基于石墨烯的气体传感器和生成空间变化的掺杂图案可能是有价值的。
We report about investigations of time-dependent structural modifications in single-crystal graphene due to laser irradiation even at moderate power levels of 1 mW in a diffraction-limited spot. The modifications have been characterized by in situ scanning confocal Raman spectroscopy, atomic force height microscopy, and transport studies. The time evolution of the Raman spectrum reveals two different effects: on a short-time scale, dopants, initially present on the flake, are removed. The longer time scale behavior points to a laser induced gradual local decomposition of single-crystal graphene into a network of interconnected nanocrystallites with a characteristic length scale of approximately 10 nm due to bond breaking. The broken bonds offer additional docking sites for adsorbates as confirmed in transport and AFM height studies. These controlled structural modifications may for instance be valuable for enhancing the local reactivity, trimming graphene based gas sensors and generating spatially varying doping patterns.