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Pushing the boundaries of interfacial sensitivity in graphene FET sensors : Polyelectrolyte multilayers strongly increase the Debye screening length

Titelangaben

Piccinini, Esteban ; Alberti, Sebastián ; Longo, Gabriel S. ; Berninger, Teresa ; Breu, Josef ; Dostalek, Jakub ; Azzaroni, Omar ; Knoll, Wolfgang:
Pushing the boundaries of interfacial sensitivity in graphene FET sensors : Polyelectrolyte multilayers strongly increase the Debye screening length.
In: The Journal of Physical Chemistry C. (Januar 2018) .
ISSN 1932-7455
DOI: 10.1021/acs.jpcc.7b11128

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Abstract

Nanomaterial-based FET sensors represent an attractive platform for ultrasensitive, real-time, and label-free detection of chemical and biological species. Nevertheless, because their response is screened by mobile ions, it remains a challenge to use them to sense in physiological ionic strength solutions. In this work, it is demonstrated, both experimentally and theoretically, that polyelectrolyte multilayers are capable of increasing the sensing range of graphene-based FETs. Potential shifts at graphene surfaces and film thickness are recorded upon the construction of PDADMAC/PSS polyelectrolyte multilayer (PEM) films. By correlation of the potential shift with the film thickness, the electrostatic screening length and the concentration of mobile ion inside the films have been deduced. Across the polymer interface the Debye length is increased more than 1 order of magnitude. The fundamentals of this strategy are described by a conceptually simple thermodynamic model, which accounts for the entropy loss of ion confinement and incorporates the effect of ions finite volume. Interestingly, the electrostatic screening inside the film strongly depends on the polymer density and the ionic strength of the solution. Of particular interest in physiological condition sensing, the PEM interfaces can extend the Debye length from 0.8 to 10 nm.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie I
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Chemie > Lehrstuhl Anorganische Chemie I > Lehrstuhl Anorganische Chemie I - Univ.-Prof. Dr. Josef Breu
Titel an der UBT entstanden: Nein
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
500 Naturwissenschaften und Mathematik > 540 Chemie
Eingestellt am: 29 Mär 2018 06:24
Letzte Änderung: 29 Mär 2018 06:33
URI: https://eref.uni-bayreuth.de/id/eprint/43091