Weng Shao-Wei, Lin Wei-Hsiang, Su Wei-Bin, Hwu En-Te, Chen Peilin, Tsai Tsong-Ru, Chang Chia-Seng
Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan. Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 20224, Taiwan.
Nanotechnology. 2014 Jun 27;25(25):255703. doi: 10.1088/0957-4484/25/25/255703. Epub 2014 Jun 4.
We demonstrate that the Raman intensities of G and 2D bands of a suspended graphene can be enhanced using a gold tip with an apex size of 2.3 μm. The enhancement decays with the tip-graphene distance exponentially and remains detectable at a distance of 1.5 μm. Raman mappings show that the enhanced area is comparable to the apex size. Application of a bias voltage to the tip can attract the graphene so that Raman signals are intensified. The exponential enhancement-distance relationship enables the measurement of the graphene deformation, and the Young's modulus of graphene is estimated to be 1.48 TPa.
我们证明，使用顶端尺寸为2.3μm的金尖端可以增强悬浮石墨烯的G带和2D带的拉曼强度。这种增强随着尖端与石墨烯的距离呈指数衰减，并且在1.5μm的距离处仍可检测到。拉曼映射表明，增强区域与顶端尺寸相当。向尖端施加偏置电压可以吸引石墨烯，从而增强拉曼信号。指数增强-距离关系能够测量石墨烯的形变，并且估计石墨烯的杨氏模量为1.48太帕斯卡。
