title: Estimating Young's modulus of graphene with Raman scattering enhanced by micrometer tip.
abstract: 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.
authors.affiliation: Institute of Physics, Academia Sinica, Nankang, Taipei 11529, Taiwan. Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 20224, Taiwan.
authors.forename: Shao-Wei
authors.initials: SW
authors.lastname: Weng
authors.forename: Wei-Hsiang
authors.initials: WH
authors.lastname: Lin
authors.forename: Wei-Bin
authors.initials: WB
authors.lastname: Su
authors.forename: En-Te
authors.initials: ET
authors.lastname: Hwu
authors.forename: Peilin
authors.initials: P
authors.lastname: Chen
authors.forename: Tsong-Ru
authors.initials: TR
authors.lastname: Tsai
authors.forename: Chia-Seng
authors.initials: CS
authors.lastname: Chang