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Enhancing gas induced charge doping in graphene field effect transistors by non-covalent functionalization with polyethyleneimine

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5 Author(s)
Sabri, Shadi S. ; Regroupement Québécois sur les matériaux de pointe, Montréal, Québec H3C 3J7, Canada ; Guillemette, Jonathan ; Guermoune, Abdelaadim ; Siaj, Mohamed
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We demonstrate that large-area, graphene field effect transistors with a passive parylene substrate and a polyethyleneimine functional layer have enhanced sensitivity to CO2 gas exposure. The electron doping of graphene, caused by protonated amine groups within the polyethyleneimine, is modulated by the formation of negatively charged species generated by CO2 adsorption. The charge doping mechanism is general, and quantitative doping density changes can be determined from the graphene field effect transistor characteristics.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 11 )

Date of Publication:

Mar 2012

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