Investigation into the suitability of screen printed graphene-melanin pH sensors for use in bacterial culturing applications

Engenharia de materiais: materializando o futuro

“…Todo o desenvolvimento do processamento possibilitou a sua utilização em sensores de pH (Fig. 4a) (PIACENTI-SILVA et al, 2014b;TEHRANI et al, 2020;WHELAN et al, 2022). A melanina também foi utilizada como eletrólito sólido em transistor eletroquímico orgânico capaz de transduzir corrente iônica em eletrônica (SHELIA-KINA; MOSTERT; MEREDITH, 2018b), em baterias (KIM et al, 2013(KIM et al, , 2014, células solares sensibilizadas por corantes (LEE et al, 2013;PAULIN, 2016;SILVA et al, 2019), capacitores (ALBANO et al, 2019 e supercapacitores (Fig.…”

Decoding eumelanin's spin label signature: a comprehensive EPR analysis

“…19,20 Melanins, especially the main subclass eumelanin, are also receiving attention in chemistry, physics, and materials science due to potential technological applications in biomedicine, organic electronics, and bioelectronics. 5,6,9 Indeed, several devices' platforms, such as electrochemical transistors, [21][22][23] energy storage, [24][25][26][27] memory, 28 optoelectronic skins, 29 phototransistors, 30 and sensors, [31][32][33][34][35] can be found in the literature. The variety of applications is attributable to the ability to form smooth and homogenous thin films [35][36][37] and to many relevant physicochemical properties, including UV-Vis broadband optical absorption, photoluminescence quantum efficiency to almost null, metal-ion chelation, radical scavenging, redox activity, paramagnetism, and hydrationdependent charge-transport.…”

Electrochemical Doping Effect on the Conductivity of Melanin-Inspired Materials

“…Sulfonated melanin (SMel) was proposed to overcome limitations in melanin’s low solubility. − In the synthesis, sulfonated groups (−SO 2 CH 3 ), originating from the oxidation of dimethyl sulfoxide (DMSO), are incorporated into the monomeric DHI and DHICA units (Figure a). , The addition of sulfonated groups enhanced the melanin’s solubility in different organic solvents (DMSO, N -methyl-2-pyrrolidone, and dimethylformamide), enabling the deposition of homogeneous films on both hydrophilic and hydrophobic surfaces. This improvement in solubility, coupled with good substrate adhesion, expands its potential for biodevice applications − without causing significant alterations to its biocompatibility and optical and electrical properties. ,, …”