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

Author(s)

Santhiago, Murilo ; Strauss, Mathias ; Pereira, Mariane P. ; Chagas, Andreia S. ; Bufon, Carlos C. B.

• Document type: Journal article
• Source: ACS APPLIED MATERIALS & INTERFACES; v. 9, n. 13, p. 11959-11966, APR 5 2017.
• Web of Science Citations: 25

Abstract

-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 César Bof Bufon
• Support Opportunities: Research Grants - Young Investigators Grants
• FAPESP's process: 09/54066-7 - Multi-User Laboratory for Advanced Optical Spectroscopy
• Grantee: Yoshitaka Gushikem
• Support Opportunities: Multi-user Equipment Program
• FAPESP's process: 13/22127-2 - Development of novel materials strategic for integrated analytical devices
• Grantee: Lauro Tatsuo Kubota
• Support Opportunities: Research Projects - Thematic Grants