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Vertical organic field-effect transistor using dyes of natural origin as active layer

Grant number: 15/23000-1
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2017
Effective date (End): February 24, 2021
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal researcher:Carlos Frederico de Oliveira Graeff
Grantee:João Vitor Paulin
Home 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):18/02411-1 - Proton injecting systems based on melanin derivatives, BE.EP.DR


Nowadays, great research efforts to build organic electronic devices has provided a rapid advance in flexible, environmentally friendly and low cost devices, using organic semiconductors that combine optical and electronic properties of inorganic materials with the processing capabilities of polymeric materials. Moreover, with the use of natural materials arises the possibility to obtain biocompatible and biodegradable devices, which makes its application an attractive alternative to bioelectronics. Based on this retrospect, this proposal deals with the use of dyes of natural origin (such as melanin and indigo) in active layers of vertical organic field-effect transistor (VOFETs), since they have interesting physical and chemical properties, they are not toxic and are easy to obtain. The deposition of thin films will be from the spin-coating technique, and will be characterized from microscopy (AFM, SEM, confocal), optical spectroscopy, impedance spectroscopy and cyclic voltammetry. The characterization of VOFETs will be performed by IxV measures three terminals and also for the spin-dependent transport techniques. It is expected to obtain values comparable to the current state of the art for devices in this category.

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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)
PAULIN, V, J.; BATAGIN-NETO, A.; MEREDITH, P.; GRAEFF, C. F. O.; MOSTERT, A. B. Shedding Light on the Free Radical Nature of Sulfonated Melanins. Journal of Physical Chemistry B, v. 124, n. 46, p. 10365-10373, NOV 19 2020. Web of Science Citations: 0.
TEHRANI, Z.; WHELAN, S. P.; MOSTERT, A. B.; PAULIN, V, J.; ALI, M. M.; AHMADI, E. DAGHIGH; GRAEFF, C. F. O.; GUY, O. J.; GETHIN, D. T. Printable and flexible graphene pH sensors utilising thin film melanin for physiological applications. 2D MATERIALS, v. 7, n. 2 APR 2020. Web of Science Citations: 0.
SIMAO ALBANO, LUIZ GUSTAVO; PAULIN, JOAO VITOR; TRINO, LUCIANA DANIELE; FERNANDES, SILVIA LETICIA; DE OLIVEIRA GRAEFF, CARLOS FREDERICO. Ultraviolet-protective thin film based on PVA-melanin/rod-coated silver nanowires and its application as a transparent capacitor. Journal of Applied Polymer Science, v. 136, n. 30 AUG 10 2019. Web of Science Citations: 1.
PAULIN, JOAO V.; BATAGIN-NETO, AUGUSTO; GRAEFF, CARLOS F. O. Identification of Common Resonant Lines in the EPR Spectra of Melanins. Journal of Physical Chemistry B, v. 123, n. 6, p. 1248-1255, FEB 14 2019. Web of Science Citations: 1.
PAULIN, JOAO VITOR; VEIGA, AMANDA GARCEZ; GARCIA-BASABE, YUNIER; MIRANDA ROCCO, MARIA LUIZA; GRAEFF, CARLOS F. O. Structural and optical properties of soluble melanin analogues with enhanced photoluminescence quantum efficiency. Polymer International, v. 67, n. 5, p. 550-556, MAY 2018. Web of Science Citations: 1.

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