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Label‐Free Electrochemical Imaging of Latent Fingerprints on Metal Surfaces
Author(s) -
Qin Gang,
Zhang Meiqin,
Zhang Ting,
Zhang Yang,
McIntosh Mike,
Li Xiao,
Zhang Xueji
Publication year - 2012
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100694
Subject(s) - scanning electrochemical microscopy , electrochemistry , materials science , platinum , metal , analytical chemistry (journal) , ferrocene , substrate (aquarium) , fingerprint (computing) , chemistry , electrode , chromatography , metallurgy , artificial intelligence , organic chemistry , computer science , catalysis , oceanography , geology
Abstract A label‐free electrochemical method based on scanning electrochemical microscopy (SECM) has been developed to image latent fingerprints with high resolution on five kinds of metal surfaces (platinum, gold, silver, copper and stainless steel), as it could measure the minor conductivity differences of the substrate surface and avoid the interference of the background‐color. The images of sebaceous fingerprints on clean metals were revealed by SECM with ferrocene methanol acting as a redox mediator to detect the topology of the fingerprint deposits in constant‐height feedback mode. Inhibition of electrochemical processes on areas of the surface masked by the insulating fingerprint residues generated a negative image of the fingerprint.