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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41386

Title: Edge promoted ultrasensitive electrochemical detection of organic bio-molecules on epitaxial graphene nanowalls
Authors: Pradip Kumar Roy
Abhijit Ganguly
Wei-Hsun Yang
Chien-Ting Wu
Jih-Shang Hwang
Yian Tai
Kuei-Hsien Chen
Li-Chyong Chen
Surojit
Contributors: 國立臺灣海洋大學:光電科學研究所
Keywords: Limit of detection
Electrochemical detection
Three dimensional (3D) epitaxial graphene
Dopamine
Sensitivity
Reaction kinetics
Date: 2015
Issue Date: 2017-02-15T02:34:22Z
Publisher: Journal of Biosensor and Bioelectronics
Abstract: Abstract: We report the simultaneous electrochemical detection of dopamine (DA), uric acid (UA) and ascorbic acid (AA) on three dimensional (3D) unmodified ‘as-grown’ epitaxial graphene nanowall arrays (EGNWs). The 3D few layer EGNWs, unlike the 2D planar graphene, offers an abundance of vertically oriented nano-graphitic-edges that exhibit fast electron-transfer kinetics and high electroactive surface area to geometrical area (EAA/GA≈134%), as evident from the Fe(CN)63−/4− redox kinetic study. The hexagonal sp2-C domains, on the basal plane of the EGNWs, facilitate efficient adsorption via spontaneous π–π interaction with the aromatic rings in DA and UA. Such affinity together with the fast electron kinetics enables simultaneous and unambiguous identification of individual AA, DA and UA from their mixture. The unique edge dominant EGNWs result in an unprecedented low limit of detection (experimental) of 0.033 nM and highest sensitivity of 476.2 µA/µM/cm2, for UA, which are orders of magnitude higher than comparable existing reports. A reaction kinetics based modeling of the edge-oriented 3D EGNW system is proposed to illustrate the superior electro-activity for bio-sensing applications.
Relation: 70
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/41386
Appears in Collections:[光電科學研究所] 期刊論文

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