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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Yang, Wei-Hsun Ganguly, Abhijit Kumar Roy, Pradip Chen, Li-Chyong Chen, Kuei-Hsien Hwang, Jih-Shang Tai, Yian Chattopadhyay, Surojit Wu, Chien-Ting |
| Description | Country affiliation: Taiwan Author Affiliation: Kumar Roy P ( Institute of Biophotonics, National Yang-Ming University, Taipei, Taiwan.); Ganguly A ( Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan); Yang WH ( Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.); Wu CT ( Nano Device Materials Characterization Division, National Nano Device Laboratories, Hsinchu, Taiwan.); Hwang JS ( Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung, Taiwan.); Tai Y ( Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.); Chen KH ( Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan); Chen LC ( Center for Condensed Matter Sciences, National Taiwan University, Taipei, Taiwan. Electronic address: chenlc@ntu.edu.tw.); Chattopadhyay S ( Institute of Biophotonics, National Yang-Ming University, Taipei, Taiwan) |
| 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)6(3-/4-) redox kinetic study. The hexagonal sp(2)-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/cm(2), 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. |
| ISSN | 09565663 |
| Volume Number | 70 |
| e-ISSN | 18734235 |
| Journal | Biosensors and Bioelectronics |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2015-08-15 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Biopolymers Analysis Conductometry Instrumentation Graphite Chemistry Immunoassay Nanoparticles Organic Chemicals Complex Mixtures Equipment Design Equipment Failure Analysis Microchemistry Ultrastructure Reproducibility Of Results Sensitivity And Specificity Journal Article Research Support, Non-u.s. Gov't Discipline Biotechnology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nanoscience and Nanotechnology Medicine Biophysics Biomedical Engineering Biotechnology Electrochemistry |
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