BK21 Physics Division, Department of Energy Science, Center for Nanotubes and Nanostructured Composites, and Sungkyunkwan Advanced Institute of Nanotechnology, Sungkyunkwan University, Suwon 440-746, Korea.
ACS Nano. 2011 Jan 25;5(1):263-8. doi: 10.1021/nn1026438. Epub 2010 Dec 21.
Despite the availability of large-area graphene synthesized by chemical vapor deposition (CVD), the control of a uniform monolayer graphene remained challenging. Here, we report a method of acquiring monolayer graphene by laser irradiation. The accumulation of heat on graphene by absorbing light, followed by oxidative burning of upper graphene layers, which strongly relies on the wavelength of light and optical parameters of the substrate, was in situ measured by the G-band shift in Raman spectroscopy. The substrate plays a crucial role as a heat sink for the bottom monolayer graphene, resulting in no burning or etching. Oscillatory thinning behavior dependent on the substrate oxide thickness was evaluated by adopting a simple Fresnel's equation. This paves the way for future research in utilizing monolayer graphene for high-speed electronic devices.
尽管化学气相沉积（CVD）可以合成大面积的石墨烯，但要控制其形成均匀的单层石墨烯仍然具有挑战性。在这里，我们报告了一种通过激光辐照获得单层石墨烯的方法。通过吸收光在石墨烯上积累热量，然后通过氧化燃烧上层石墨烯，这强烈依赖于光的波长和基底的光学参数，通过拉曼光谱中的 G 带位移进行原位测量。基底作为底层单层石墨烯的热沉，起着至关重要的作用，从而导致没有燃烧或刻蚀。通过采用简单的菲涅耳方程，评估了依赖于基底氧化物厚度的周期性减薄行为。这为未来利用单层石墨烯研究高速电子器件铺平了道路。
