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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Direct Drawing Method of Graphite onto Paper for High-Performance Flexible Electrochemical Sensors

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Santhiago, Murilo ; Strauss, Mathias ; Pereira, Mariane P. ; Chagas, Andreia S. ; Bufon, Carlos C. B.
Total Authors: 5
Document type: Journal article
Source: ACS APPLIED MATERIALS & INTERFACES; v. 9, n. 13, p. 11959-11966, APR 5 2017.
Web of Science Citations: 24

-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)

FAPESP's process: 14/25979-2 - Fabrication and characterization of devices and systems based on hybrid nanomembranes
Grantee:Carlos Cesar Bof Bufon
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 09/54066-7 - Multi-User Laboratory for Advanced Optical Spectroscopy
Grantee:Yoshitaka Gushikem
Support type: Multi-user Equipment Program
FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
Grantee:Lauro Tatsuo Kubota
Support type: Research Projects - Thematic Grants