Fingerprint imaging by scanning electrochemical microscopy |
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| Affiliation: | 1. Department of Physiology and Pharmacology, Federal University of Ceará, Brazil;2. CNC – Center for Neurosciences and Cell Biology, University of Coimbra, Portugal;3. Department of Biology, University of Aveiro, Portugal;4. Department of Life Sciences, Faculty of Science and Technology, University of Coimbra, Portugal;5. FMUC – Faculty of Medicine, University of Coimbra, Portugal;1. Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, PR China;2. College of Science, University of Shanghai for Science and Technology, Shanghai 200093, PR China;1. College of Chemistry, Chemical Engineering and Environment, Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology, Minnan Normal University, Zhangzhou 363000, PR China;2. Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Province, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China |
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| Abstract: | An efficient strategy for visualizing human fingerprints on a poly(vinylidene difluoride) membrane (PVDF) by scanning electrochemical microscopy (SECM) has been developed. Compared to a classical ink fingerprint image, here the ink is replaced by an aqueous solution of bovine serum albumin (BSA). After placing the “inked” finger on a PVDF membrane, the latent image is stained by silver nitrate and the fingerprint is imaged electrochemically using potassium hexachloroiridate (III) (K3IrCl6) as a redox mediator. SECM images with an area of 5 mm × 3 mm have been recorded with a high-resolution using a 25-μm-diameter Pt disk-shaped microelectrode. Pores in the skin (40–120 μm in diameter) and relative locations of ridges were clearly observed. The factors relevant to the quality of fingerprint images are discussed. |
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