Tunable and highly reproducible metal–insulator transitions have been observed in bilayer graphene upon thermal annealing at 400 K under high vacuum conditions. Before annealing, the sample is metallic in the whole temperature regime of study. Upon annealing, the conductivity changes from metallic to that of an insulator and the transition temperature is a function of annealing time. The pristine metallic state can be reinstated by exposing to air thereby inducing changes in the electronic properties by adsorbing water vapor, which makes graphene a technologically promising material for sensor applications.
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Research Article| June 09 2011
Tunable metal–insulator transitions in bilayer graphene by thermal annealing
Young Jun Shin;
Gopinadhan Kalon, Young Jun Shin, Hyunsoo Yang; Tunable metal–insulator transitions in bilayer graphene by thermal annealing. Appl. Phys. Lett. 6 June 2011; 98 (23): 233108. https://doi.org/10.1063/1.3598403
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