Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 13, Pages 11959-11966Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15646
Keywords
paper-based devices; carbon electrodes; direct transfer method; nanodebris; electrocatalytic detection
Funding
- CNPq [483550/2013-2]
- FAPESP [2013/22127-2, 2014/25979-2]
- Laboratory of Advanced Optical Spectroscopy (LMEOA/IQ-UNICAMP/FAPESP) [2009/54066-7]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [09/54066-7] Funding Source: FAPESP
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-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.
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