| Texto completo | |
| Autor(es): |
Santhiago, Murilo
;
Strauss, Mathias
;
Pereira, Mariane P.
;
Chagas, Andreia S.
;
Bufon, Carlos C. B.
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS APPLIED MATERIALS & INTERFACES; v. 9, n. 13, p. 11959-11966, APR 5 2017. |
| Citações Web of Science: | 25 |
| Resumo | |
-A simple and fast fabrication method to create high-performance pencil -drawn electrochemical sensors is reported for the first time. The sluggish electron- transfer observed on bare pencil -drawn surfaces was enhanced using two electrochemical steps: first oxidizing the surface and then reducing it in a subsequent step. The heterogeneous rate constant was found to be 5.1 x 10(-3) cm s(-1), which is the highest value reported so far for pencil-drawn surfaces. We mapped the, origin of such performance by atomic force microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy.- Our results suggest that the oxidation process leads to `chemical land structural transformations on. the surface. As a proof -of -concept, we modified the pencil -drawn surface with, Meldola's blue to electrocatalytically detect nicotinainide adenine dinucleotide (NADH). The electrochemical device exhibited the highest catalytic,constant 41.7 X 10(5) L mol(-1) s(-1)) and the -lowest detection potential for NADH reported so far in -paper -based electrodes. (AU) | |
| Processo FAPESP: | 14/25979-2 - Fabricação e caracterização de dispositivos e sistemas baseados em nanomembranas híbridas |
| Beneficiário: | Carlos César Bof Bufon |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 09/54066-7 - Laboratório Multiusuário de Espectroscopia Óptica Avançada |
| Beneficiário: | Yoshitaka Gushikem |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Equipamentos Multiusuários |
| 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 |