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Scanning electron microscope images of nanofibers of poly (ethyl 2-cyanoacrylate)
Nanofibers of poly (ethyl 2-cyanoacrylate) were grown on fingerprint ridges at 30 degrees Celsius at a relative humidity of more than 95 percent over a period of 16 hours. Scanning electron microscope image (a) shows a low magnification view; image (b) shows a close-up view of the ridge pattern; image (c) shows a close-up view of the nanofibers; and image (d) is a magnified view of a single fiber.
Credit: Reproduced by permission of The Royal Society of Chemistry; Penn State
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Related story: From Fingerprints to Fiberprints