Tripathi Manoj, King Alice, Fratta Giuseppe, Meloni Manuela, Large Matthew, Salvage Jonathan P, Pugno Nicola Maria, Dalton Alan B
Department of Physics and Astronomy, University of Sussex, Brighton BN1 9RH, U.K.
School of Pharmacy and Biomolecular Science, University of Brighton, Brighton BN2 4GJ, U.K.
ACS Omega. 2018 Dec 11;3(12):17000-17009. doi: 10.1021/acsomega.8b02815. eCollection 2018 Dec 31.
A simple procedure of producing three-dimensional blisters of graphene through irradiation of the visible range laser by Raman spectrometer has been presented. Fabrication of different volumes of the blisters and their characterization were carried out with Raman spectroscopy by tuning the irradiation dose. The produced blisters showed a consistency in altitude and a remarkable change in functionality, adhesion force map and local contact potential difference as compared to untreated monolayer graphene and naturally occurred graphene nanobubbles. Nevertheless, bilayer graphene is unaffected in the applied laser doses. The laser irradiation led to lattice expansion of carbon atoms and introduced oxygenic functional groups with the structural disorder. The internal pressure of the gaseous molecules was evaluated by monitoring the shape of the graphene blisters and nanobubbles. High-resolution Raman mapping showed the impact of laser-affected area and the defect density ( ) is reported as a function of displacement. Our results reveal ease of applicability of the Raman laser for the imaging and texturing of graphene pointing toward the possibility of the desirable and cost-effective laser writing at the submicron scale by tuning photochemistry of graphene which is pivotal for numerous applications.
本文介绍了一种通过拉曼光谱仪照射可见范围激光来制备三维石墨烯水泡的简单方法。通过调整照射剂量，利用拉曼光谱对不同体积的水泡进行制备及其表征。与未处理的单层石墨烯和自然形成的石墨烯纳米气泡相比，所制备的水泡在高度上具有一致性，并且在功能、粘附力图和局部接触电势差方面有显著变化。然而，双层石墨烯在所施加的激光剂量下不受影响。激光照射导致碳原子的晶格膨胀，并引入了具有结构无序的含氧官能团。通过监测石墨烯水泡和纳米气泡的形状来评估气态分子的内部压力。高分辨率拉曼映射显示了激光影响区域的影响，并且报告了缺陷密度（ ）作为位移的函数。我们的结果表明，拉曼激光易于应用于石墨烯的成像和纹理化，这表明通过调整对众多应用至关重要的石墨烯光化学，有可能在亚微米尺度实现理想且经济高效的激光写入。
