Comparison of activation processes for 3D printed PLA-graphene electrodes: electrochemical properties and application for sensing of dopamine

Autor(es)

Kalinke, Cristiane ^[1] ; Neumsteir, Naile Vacilotto ^[1] ; Aparecido, Gabriel de Oliveira ^[1] ; de Barros Ferraz, Thiago Vasconcelos ^[1] ; dos Santos, Pamyla Layene ^[1] ; Janegitz, Bruno Campos ^[2] ; Bonacin, Juliano Alves ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil

^[2] Univ Fed Sao Carlos, Dept Nat Sci Math & Educ, BR-13600970 Araras, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: ANALYST; v. 145, n. 4, p. 1207-1218, FEB 21 2020.
• Citações Web of Science: 0

Resumo

This paper reports the comparison of the electrochemical properties of 3D PLA-graphene electrodes (PLA-G) under different activation conditions and through different processes. In this work, the performance of the electrodes was evaluated after polishing, electrochemical and chemical treatments and a combination of them. The best results were obtained with hydroxide activation using 1.0 mol L-1 NaOH for 30 min of immersion, which promoted the saponification of PLA exposing the graphene nanoribbon structures. The improvement was more evident also after electrochemical activation, which led to a great increase in surface area, defects, electron transfer rate and amount of edge sites. The analytical performance of the proposed PLA-G(NaOH-30-EC) electrode was evaluated in the presence of dopamine (DA) by three electrochemical techniques, presenting a broad linear range, and limits of detection of 3.49, 2.17 and 1.67 mu mol L-1 were obtained by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and square wave voltammetry (SWV), respectively. The separation and quantification of DA in the presence of AA and UA was also reported. The sensor showed good repeatability and reproducibility and was successfully applied to DA determination in synthetic urine and human serum, showing good recovery, from 88.8 to 98.4%. Therefore, the activation methods were essential for the improvement in the 3D PLA-G electrode properties, allowing graphene surface alteration and electrochemical enhancement in the sensing of molecular targets. (AU)

• Processo FAPESP: 17/23960-0 - Estudo de mecanismo de oxidação de água por catalisadores operando em pH=7 e sua incorporação em eletrodos impressos em 3D
• Beneficiário: Juliano Alves Bonacin
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/21898-6 - Novos dispositivos condutores para aplicação em sensores e biossensores eletroquímicos
• Beneficiário: Bruno Campos Janegitz
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/21097-3 - Interações abelha-agricultura: perspectivas para a utilização sustentável
• Beneficiário: Osmar Malaspina
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 19/00473-2 - Desenvolvimento de biossensores eletroquímicos impressos em 3 dimensões (3D) com polímero PLA e grafeno para a determinação de biomoléculas e diagnóstico de doenças
• Beneficiário: Cristiane Kalinke
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 13/22127-2 - Desenvolvimento de novos materiais estratégicos para dispositivos analíticos integrados
• Beneficiário: Lauro Tatsuo Kubota
• Modalidade de apoio: Auxílio à Pesquisa - Temático