Uniaxial strain on graphene: Raman spectroscopy study and band-gap opening.

By Zhenhua Ni, T. Yu, Yunhao Lu, Ying Ying Wang, Y. Feng, Z. Shen. ACS Nano, 2008

1,525 citations recorded by the source corpus.

Graphene was deposited on a transparent and flexible substrate, and tensile strain up to approximately 0.8% was loaded by stretching the substrate in one direction. Raman spectra of strained graphene show significant red shifts of 2D and G band (-27.8 and -14.2 cm(-1) per 1% strain, respectively) because of the elongation of the carbon-carbon bonds. This indicates that uniaxial strain has been successfully applied on graphene. We also proposed that, by applying uniaxial strain on graphene, tunable band gap at K point can be realized. First-principle calculations predicted a band-gap opening of approximately 300 meV for graphene under 1% uniaxial tensile strain. The strained graphene provides an alternative way to experimentally tune the band gap of graphene, which would be more efficient and more controllable than other methods that are used to open the band gap in graphene. Moreover, our results suggest that the flexible substrate is ready for such a strain process, and Raman spectroscopy can be used as an ultrasensitive method to determine the strain.

Subfields: Biomedical Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/c38d6dd7281a289f46acbf32e20f0819f5d730d8

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Citations in the corpus

Colloquium: Graphene spectroscopy (2014, background): “Next, shifting the Dirac point in the k-space away from the K (K′) points (Dietl et al., 2008; Farjam and Rafii-Tabar, 2009; Ni et al., 2008a, 2009a; Pereira and Castro Neto, 2009). is analogous to the effect induced by an external magnetic field applied perpendicular to the graphene plane.”
Graphene Sensors (2011, background): “The opening of this band gap might however be observed using Raman spectroscopy [79], or a pseudomagnetic quantum Hall-effect associated with strong gauge fields which are predicted in strained graphene [80].”
Graphene for controlled and accelerated osteogenic differentiation of human mesenchymal stem cells. (2011, background): “Such forces could potentially be even easier to realize on PET and PDMS substrates, since on these materials graphene is already pre-strained.(31) Cell induced out-of-plane deformations could further enhance the reactivity of nanorippled graphene sheets.”
Graphene and derivatives – Synthesis techniques, properties and their energy applications (2017, positive): “Ni et al. [121] have mentioned that it is possible to tune the band gap by introducing a controlled strain, as the strain may change electric band structure.”