Reversible Switching of the Dirac Point in Graphene Field-Effect Transistors Functionalized with Responsive Polymer Brushes

The reversible control of the graphene Dirac point using external chemical stimuli is of major interest in the development of advanced electronic devices such as sensors and smart logic gates. Here, we report the coupling of chemoresponsive polymer brushes to reduced graphene oxide (rGO)-based field...

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Autores principales: Piccinini, Esteban, Bliem, Christina, Giussi, Juan Martín, Knoll, Wolfgang, Azzaroni, Omar
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Química
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124090
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124090
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
spellingShingle Química
Piccinini, Esteban
Bliem, Christina
Giussi, Juan Martín
Knoll, Wolfgang
Azzaroni, Omar
Reversible Switching of the Dirac Point in Graphene Field-Effect Transistors Functionalized with Responsive Polymer Brushes
topic_facet Química
description The reversible control of the graphene Dirac point using external chemical stimuli is of major interest in the development of advanced electronic devices such as sensors and smart logic gates. Here, we report the coupling of chemoresponsive polymer brushes to reduced graphene oxide (rGO)-based field-effect transistors to modulate the graphene Dirac point in the presence of specific divalent cations. Poly[2-(methacryloyloxy)ethyl] phosphate (PMEP) brushes were grown on the transistor channel by atom transfer radical polymerization initiated from amine-pyrene linkers noncovalently attached to rGO surfaces. Our results show an increase in the Dirac point voltage due to electrostatic gating effects upon the specific binding of Ca2+ and Mg2+ to the PMEP brushes. We demonstrate that the electrostatic gating is reversibly controlled by the charge density of the polymer brushes, which depends on the divalent cation concentration. Moreover, a theoretical formalism based on the Grahame equation and a Langmuir-type binding isotherm is presented to obtain the PMEP-cation association constant from the experimental data.
format Articulo
Articulo
author Piccinini, Esteban
Bliem, Christina
Giussi, Juan Martín
Knoll, Wolfgang
Azzaroni, Omar
author_facet Piccinini, Esteban
Bliem, Christina
Giussi, Juan Martín
Knoll, Wolfgang
Azzaroni, Omar
author_sort Piccinini, Esteban
title Reversible Switching of the Dirac Point in Graphene Field-Effect Transistors Functionalized with Responsive Polymer Brushes
title_short Reversible Switching of the Dirac Point in Graphene Field-Effect Transistors Functionalized with Responsive Polymer Brushes
title_full Reversible Switching of the Dirac Point in Graphene Field-Effect Transistors Functionalized with Responsive Polymer Brushes
title_fullStr Reversible Switching of the Dirac Point in Graphene Field-Effect Transistors Functionalized with Responsive Polymer Brushes
title_full_unstemmed Reversible Switching of the Dirac Point in Graphene Field-Effect Transistors Functionalized with Responsive Polymer Brushes
title_sort reversible switching of the dirac point in graphene field-effect transistors functionalized with responsive polymer brushes
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/124090
work_keys_str_mv AT piccininiesteban reversibleswitchingofthediracpointingraphenefieldeffecttransistorsfunctionalizedwithresponsivepolymerbrushes
AT bliemchristina reversibleswitchingofthediracpointingraphenefieldeffecttransistorsfunctionalizedwithresponsivepolymerbrushes
AT giussijuanmartin reversibleswitchingofthediracpointingraphenefieldeffecttransistorsfunctionalizedwithresponsivepolymerbrushes
AT knollwolfgang reversibleswitchingofthediracpointingraphenefieldeffecttransistorsfunctionalizedwithresponsivepolymerbrushes
AT azzaroniomar reversibleswitchingofthediracpointingraphenefieldeffecttransistorsfunctionalizedwithresponsivepolymerbrushes
bdutipo_str Repositorios
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