Obtation and characterization of organic electrochemical transistors based on melanin

• Grant number: 22/00410-3
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)
• Start date: July 01, 2022
• End date: February 28, 2027
• Field of knowledge: Physical Sciences and Mathematics - Physics - Condensed Matter Physics
• Principal Investigator: Carlos Frederico de Oliveira Graeff
• Grantee: Natan Luis Nozella
• Host Institution: Faculdade de Ciências (FC). Universidade Estadual Paulista (UNESP). Campus de Bauru. Bauru , SP, Brazil
• Associated research grant: 13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID
• Associated scholarship(s): 25/03495-8 - Neuromorphic spiking systems based on Melanin/PEDOT:PSS transistors, BE.EP.DD

Abstract

The present project aims to obtain and characterize organic electrochemical transistors (OECTs) from synthetic melanin in combination with conductive materials. The OECT is a device capable of modulating the current of a semiconductor channel by changing its doping state through gate-controlled ion injection. The device arouses great interest due to its ability to emulate synapses and potential revolution in current methods of data processing and storage. The use of melanin in OECTs is of great interest due to its biocompatibility and good ion permeability, however synthetic melanin has low electronic conductivity. To improve the electronic conductivity of melanin, we will use materials such as polyaniline (PANI), PPy, rGO and MXenes. We will thus combine the good ionic permeability of melanin with the good electrical properties of the conductive polymer in order to obtain OECTs with a high µC* product value. Melanins with different functionalizations, synthesized by different processes will be combined with the conductors forming blends or composites for use as an active layer of OECTs. The OECTs will be characterized electrically, by DC methods (characteristic and transfer curves) and by electrical impedance spectroscopy. Finally, the stability of the devices will be tested using electrical stress measurements. (AU)

Scientific publications

(5)

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

GUERRA, NAYRIM BRIZUELA; LIMA, JOAO VICTOR MORAIS; PAULIN, JOAO VITOR; NOZELLA, NATAN LUIZ; BORATTO, MIGUEL HENRIQUE; NOGUEIRA, GABRIEL LEONARDO; BUFON, CARLOS CESAR BOF; GRAEFF, CARLOS FREDERICO DE OLIVEIRA. Electrochemical behavior of non-functionalized and sulfonated melanins at different pH values. Polymer International, v. 73, n. 11, p. 9-pg., 2024-07-12. (20/15869-6, 17/20809-0, 22/00410-3, 21/09207-3, 20/04721-8, 21/03379-7, 14/25979-2)

NOZELLA, NATAN LUIS; LIMA, JOAO VICTOR MORAIS; DE OLIVEIRA, RAFAEL FURLAN; GRAEFF, CARLOS FREDERICO DE OLIVEIRA. Melanin/PEDOT:PSS blend as organic mixed ionic electronic conductor (OMIEC) for sustainable electronics. MATERIALS ADVANCES, v. N/A, p. 12-pg., 2023-09-13. (22/00410-3, 21/03379-7, 13/07296-2, 20/12356-8, 21/06238-5)

NOZELLA, NATAN L.; PAULIN, JOAO V.; NOGUEIRA, GABRIEL L.; GUERRA, NAYRIM B.; DE OLIVEIRA, RAFAEL F.; GRAEFF, CARLOS F. O.. Probing n-Type Conduction in Eumelanin Using Organic Electrochemical Transistors. ACS APPLIED ELECTRONIC MATERIALS, v. 7, n. 8, p. 6-pg., 2025-04-03. (21/06238-5, 22/00410-3, 22/10998-8, 13/07296-2, 21/09207-3)

GUERRA, NAYRIM BRIZUELA; LIMA, JOAO VICTOR MORAIS; NOZELLA, NATAN LUIS; BORATTO, MIGUEL HENRIQUE; PAULIN, JOAO VITOR; GRAEFF, CARLOS FREDERICO DE OLIVEIRA. Electrochemical Doping Effect on the Conductivity of Melanin-Inspired Materials. ACS APPLIED BIO MATERIALS, v. 7, n. 4, p. 11-pg., 2024-03-11. (20/15869-6, 21/09207-3, 13/07296-2, 22/00410-3, 21/03379-7, 17/20809-0, 20/04721-8)

NOZELLA, NATAN L.; SELMI, GUILHERME S.; GUERRA, NAYRIM B.; PITON, MARCELO R.; GRAEFF, CARLOS F. O.; DE OLIVEIRA, RAFAEL F.. Melanin/PEDOT:PSS organic synaptic transistors: a step towards sustainable neuromorphic applications. NEUROMORPHIC COMPUTING AND ENGINEERING, v. 5, n. 1, p. 8-pg., 2025-03-01. (22/00410-3, 13/07296-2, 21/06238-5, 21/09207-3)