| Full text | |
| Author(s): |
Guerra, Nayrim Brizuela
;
Lima, Joao Victor Morais
;
Nozella, Natan Luis
;
Boratto, Miguel Henrique
;
Paulin, Joao Vitor
;
Graeff, Carlos Frederico de Oliveira
Total Authors: 6
|
| Document type: | Journal article |
| Source: | ACS APPLIED BIO MATERIALS; v. 7, n. 4, p. 11-pg., 2024-03-11. |
| Abstract | |
Eumelanin is a natural pigment that can be particularly valuable for sustainable bioelectronic devices due to its inherent biocompatibility and hydration-dependent conductivity. However, the low conductivity of eumelanin limits its technological development. In this research, electrochemical doping was proposed as an alternative route to increase the electronic conductivity of synthetic eumelanin derivatives. Thin films of sulfonated eumelanin were deposited on platinum interdigitated electrodes and electrochemically treated by using cyclic voltammetry and chronoamperometry treatments. X-ray photoelectron spectroscopy analysis confirmed ion doping in sulfonated melanin. Current-voltage, current-time, and electrochemical impedance measurements were used to investigate the effect of different aqueous electrolytes (including KCl and LiClO4) treatments on the charge transport of sulfonated eumelanin. We show that the conductivity depends on the type and size of the anion used and can reach 10(-3) S<middle dot>cm(-1). Additionally, depending on the electrolyte, there is a change in charge transport from mixed ionic/electronic to a predominantly electronic-only conduction. Our results show that the chemical nature of the ion plays an important role in the electrochemical doping and, consequently, in the charge transport of eumelanin. These insights serve as inspiration to explore the use of alternative electrolytes with different compositions further and develop eumelanin-based devices with tunable conductivities. (AU) | |
| FAPESP's process: | 20/15869-6 - Rolled-up drain vertical organic transistors towards bioelectronic and neuromorphic applications |
| Grantee: | João Vitor Paulin |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 21/09207-3 - Fabrication of electrochemical transistors based on doped melanin with improved ionic and electronic conductivity |
| Grantee: | Nayrim Brizuela Guerra |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/07296-2 - CDMF - Center for the Development of Functional Materials |
| Grantee: | Elson Longo da Silva |
| Support Opportunities: | Research Grants - Research, Innovation and Dissemination Centers - RIDC |
| FAPESP's process: | 22/00410-3 - Obtation and characterization of organic electrochemical transistors based on melanin |
| Grantee: | Natan Luis Nozella |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 21/03379-7 - Application of New Materials as Electrodes in Flexible Supercapacitors |
| Grantee: | João Victor Morais Lima |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 17/20809-0 - Study of organic devices for application in bioelectronics |
| Grantee: | Miguel Henrique Boratto |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 20/04721-8 - PEDOT:PSS and melanin as active layers in neuromorphic devices |
| Grantee: | Miguel Henrique Boratto |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |