title: A Magnetically Responsive Polydiacetylene Precursor for Latent Fingerprint Analysis.
abstract: A magnetically responsive diacetylene (DA) powder was developed for the visualization of latent fingerprints. A mixture of the DA and magnetite nanoparticles, applied to a surface containing latent fingermarks, becomes immobilized along the ridge patterns of the fingerprints when a magnetic field is applied. Alignment along the ridge structures is a consequence of favorable hydrophobic interactions occurring between the long alkyl chains in the DAs and the lipid-rich, sebaceous latent fingermarks. UV irradiation of the DA-magnetite composite immobilized on the latent fingerprint results in the generation of blue-colored PDAs. Heat treatment of the blue-colored image promotes a blue-to-red transition as well as fluorescence turn-on. A combination of the aligned pale brown-colored monomeric state, UV irradiation generated blue-colored PDA state, as well as the heat treatment generated red-colored and fluorescent PDA state enables efficient visual imaging of a latent fingerprint, which is deposited on various colored solid surfaces.
authors.affiliation: Department of Chemical Engineering, Hanyang University , Seoul 133-791, Korea.
authors.forename: Joosub
authors.initials: J
authors.lastname: Lee
authors.affiliation: Institute of Nano Science and Technology, Hanyang University , Seoul 133-791, Korea.
authors.forename: Chan Woo
authors.initials: CW
authors.lastname: Lee
authors.affiliation: Department of Chemical Engineering, Hanyang University , Seoul 133-791, Korea.|Institute of Nano Science and Technology, Hanyang University , Seoul 133-791, Korea.
authors.forename: Jong-Man
authors.initials: JM
authors.lastname: Kim
mesh_terms: D000114:Acetylene / Q000737:chemistry; D003878:Dermatoglyphics; D052203:Ferrosoferric Oxide / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D008280:Magnetics; D058185:Magnetite Nanoparticles / Q000737:chemistry; D008856:Microscopy, Fluorescence; D000078789:Polyacetylene Polymer; D011108:Polymers / Q000737:chemistry*; D053279:Polyynes / Q000737:chemistry*; D014466:Ultraviolet Rays
chemical_list: D058185:Magnetite Nanoparticles; D000078789:Polyacetylene Polymer; D011108:Polymers; D053279:Polyynes; C082361:polydiacetylene; D000114:Acetylene; D052203:Ferrosoferric Oxide
keywords: conjugated polymer; fingerprint analysis; latent fingerprint; magnetic nanoparticle; polydiacetylene