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Electrolyte‐induced modulation of electronic transport in the presence of surface charge impurities on bilayer graphene
Author(s) -
Akram Khush Bakhat,
Hassan Muhammad Umair,
Karim Altaf,
Mehmood Mazhar,
Rafiq Muhammad Aftab,
Sabahat Sana,
Manzoor Sadia
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700156
Subject(s) - graphene , bilayer graphene , scattering , materials science , electrolyte , chemical physics , condensed matter physics , nanotechnology , chemistry , electrode , optics , physics
Transport properties of liquid electrolyte‐gated bilayer graphene (BLG) were investigated in the presence of scattering centers introduced post‐growth. The scattering centers were realized by spin‐deposition of phosphine stabilized gold nanoparticles (AuNPs) of different molar concentrations (10, 20, 30, and 40 nM) directly on top of the BLG surface. Electronic transport in such samples exhibits a cluster‐like scattering behavior, that is, a decrease in charge carrier mobility accompanied by a shift of the Dirac point toward negative values with increasing density of scattering centers, indicating the n‐type doping of graphene by AuNPs. The characteristic resistivity‐gate voltage curves show the possibility of anti‐ambipolar behavior of such gated BLG films. Drude model based Kinetic Monte Carlo (KMC) simulations agree with our experimental findings and theoretically predicted behavior. Our results support the possibility of a charge carrier modulation of graphene via foreign impurity scattering introduced on its surface, as well as by the means of large electrostatic fields obtained via the liquid electrolyte gating.