Premium
Gating of Single‐Layer Graphene with Single‐Stranded Deoxyribonucleic Acids
Author(s) -
Lin Jian,
Teweldebrhan Desalegne,
Ashraf Khalid,
Liu Guanxiong,
Jing Xiaoye,
Yan Zhong,
Li Rong,
Ozkan Mihri,
Lake Roger K.,
Balandin Alexander A.,
Ozkan Cengiz S.
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200902379
Subject(s) - graphene , materials science , raman spectroscopy , density functional theory , conductance , gating , biomolecule , layer (electronics) , optoelectronics , graphene nanoribbons , ab initio , current density , chemical physics , nanotechnology , molecular physics , condensed matter physics , computational chemistry , chemistry , biophysics , physics , optics , organic chemistry , quantum mechanics , biology
Patterning of biomolecules on graphene layers could provide new avenues to modulate their electrical properties for novel electronic devices. Single‐stranded deoxyribonucleic acids (ssDNAs) are found to act as negative‐potential gating agents that increase the hole density in single‐layer graphene. Current–voltage measurements of the hybrid ssDNA/graphene system indicate a shift in the Dirac point and “intrinsic” conductance after ssDNA is patterned. The effect of ssDNA is to increase the hole density in the graphene layer, which is calculated to be on the order of 1.8 × 10 12 cm −2 . This increased density is consistent with the Raman frequency shifts in the G‐peak and 2D band positions and the corresponding changes in the G‐peak full width at half maximum. Ab initio calculations using density functional theory rule out significant charge transfer or modification of the graphene band structure in the presence of ssDNA fragments.