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Biosensors 2018, 8(4), 91; https://doi.org/10.3390/bios8040091

Phosphate Modified Screen Printed Electrodes by LIFT Treatment for Glucose Detection

1
Istituto per i Processi Chimico Fisici, UOS Bari, Via Orabona 4, 70126 Bari, Italy
2
Dipartimento di Scienze e Tecnologie Biologiche e Ambientali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy
3
IZS Puglia e Basilicata, U.O. Putignano. Via Chiancolla 1, C.da. S. Pietro Piturno, 70017 Putignano (BA), Italy
4
Department of Physics, National Technical University of Athens, Iroon Polytehneiou 9, Zografou, 15780 Athens, Greece
5
Dipartimento di Beni Culturali, Università del Salento, S.P. Lecce-Monteroni, 73100 Lecce, Italy
6
Dipartimento di Chimica, Università di Bari “Aldo Moro”, Via Orabona 4, 70125 Bari, Italy
*
Author to whom correspondence should be addressed.
Received: 19 July 2018 / Revised: 13 September 2018 / Accepted: 12 October 2018 / Published: 16 October 2018
(This article belongs to the Special Issue Printed and Flexible Sensors)
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Abstract

The design of new materials as active layers is important for electrochemical sensor and biosensor development. Among the techniques for the modification and functionalization of electrodes, the laser induced forward transfer (LIFT) has emerged as a powerful physisorption method for the deposition of various materials (even labile materials like enzymes) that results in intimate and stable contact with target surface. In this work, Pt, Au, and glassy carbon screen printed electrodes (SPEs) treated by LIFT with phosphate buffer have been characterized by scanning electron microscopy and atomic force microscopy to reveal a flattening effect of all surfaces. The electrochemical characterization by cyclic voltammetry shows significant differences depending on the electrode material. The electroactivity of Au is reduced while that of glassy carbon and Pt is greatly enhanced. In particular, the electrochemical behavior of a phosphate LIFT treated Pt showed a marked enrichment of hydrogen adsorbed layer, suggesting an elevated electrocatalytic activity towards glucose oxidation. When Pt electrodes modified in this way were used as an effective glucose sensor, a 1–10 mM linear response and a 10 µM detection limit were obtained. A possible role of phosphate that was securely immobilized on a Pt surface, as evidenced by XPS analysis, enhancing the glucose electrooxidation is discussed. View Full-Text
Keywords: screen printed electrodes; laser printing; LIFT; glucose; biosensor screen printed electrodes; laser printing; LIFT; glucose; biosensor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Milano, F.; Giotta, L.; Chirizzi, D.; Papazoglou, S.; Kryou, C.; De Bartolomeo, A.; De Leo, V.; Guascito, M.R.; Zergioti, I. Phosphate Modified Screen Printed Electrodes by LIFT Treatment for Glucose Detection. Biosensors 2018, 8, 91.

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