Infoscience

Journal article

Fingerprint imaging by scanning electrochemical microscopy

An efficient strategy for visualizing human fingerprints on a poly(vinyldene difluoride) membrane (PVDF) by sanning 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-lm-diameter Pt disk-shaped microelectrode. Pores in the skin (40–120 lm in diameter) and relative locations of ridges were clearly observed. The factors relevant to the quality of fingerprint images are discussed.

Related material