Highly loaded mildly edge-oxidized graphene nanosheet dispersions for large-scale inkjet printing of electrochemical sensors
Nagar, Bhawna (Ecole Polytechnique Fédérale de Lausanne. Laboratory of Physical and Analytical Electrochemistry)
Jović, Milica (Ecole Polytechnique Fédérale de Lausanne. Laboratory of Physical and Analytical Electrochemistry)
Bassetto, Víctor Costa (Ecole Polytechnique Fédérale de Lausanne. Laboratory of Physical and Analytical Electrochemistry)
Zhu, Yingdi (Ecole Polytechnique Fédérale de Lausanne. Laboratory of Physical and Analytical Electrochemistry)
Pick, Horst (École Polytechnique Fédérale de Lausanne. Institute of Chemical Sciences and Engineering)
Gómez-Romero, Pedro 1959- (Institut Català de Nanociència i Nanotecnologia)
Merkoçi, Arben (Institut Català de Nanociència i Nanotecnologia)
Girault, Hubert H. (Ecole Polytechnique Fédérale de Lausanne. Laboratory of Physical and Analytical Electrochemistry)
Lesch, Andreas (University of Bologna. Department of Industrial Chemistry "Toso Montanari")

Date:	2020
Abstract:	Inkjet printing of electrochemical sensors using a highly loaded mildly edge-oxidized graphene nanosheet (EOGN) ink is presented. An ink with 30 mg/mL EOGNs is formulated in a mixture of N-methyl pyrrolidone and propylene glycol with only 30 min of sonication. The absence of additives, such as polymeric stabilizers or surfactants, circumvents reduced electrochemical activity of coated particles and avoids harsh post-printing conditions for additive removal. A single light pulse from a xenon flash lamp dries the printed EGON film within a fraction of a second and creates a compact electrode surface. An accurate coverage with only 30. 4 μg of EOGNs per printed layer and cm is achieved. The EOGN films adhere well to flexible polyimide substrates in aqueous solution. Electrochemical measurements were performed using cyclic voltammetry and differential pulse voltammetry. An all inkjet-printed three-electrode living bacterial cell detector is prepared with EOGN working and counter electrodes and silver-based quasi-reference electrode. The presence of E. coli in liquid samples is recorded with four electroactive metabolic activity indicators.
Grants:	Ministerio de Economía y Competitividad MAT2014-52485-P Ministerio de Economía y Competitividad PCIN-2016-66 Ministerio de Economía y Competitividad SEV-2013-0295 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-260
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Bacteria detection ; Graphene ; Inkjet printing ; Redox indicators ; Sensors
Published in:	ChemElectroChem, Vol. 7, issue 2 (Jan. 2020) , p. 460-468, ISSN 2196-0216

DOI: 10.1002/celc.201901697

Postprint 28 p, 1.7 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles