title: Fluorescent TiO2 powders prepared using a new perylene diimide dye: applications in latent fingermark detection.
abstract: A new, highly fluorescent dye was synthesised using oleylamine combined with a perylene dianhydride compound. The new dye was characterised by 1H NMR, UV-vis spectroscopy and fluorescence spectroscopy as well as quantum yield. The dye was absorbed onto titanium dioxide nanoparticles for use as a fingerprint detection powder. The new fluorescent powder was applied to latent fingermarks deposited onto different non-porous surfaces and compared with commercial fluorescent powders. The powder exhibits strong fluorescence at 650-700 nm under excitation at 505 nm. On glass surfaces, the new powder gave images showing tertiary-level detail of the fingermark ridges with almost no background development. Compared with current magnetic fluorescent powders, the new powder was slightly weaker in fluorescence intensity but produced significantly less background development, resulting in good contrast between the fingermark and the substrate.
authors.affiliation: Centre for Forensic Science, University of Technology, Sydney, Australia.
authors.forename: Mi Jung
authors.initials: MJ
authors.lastname: Choi
authors.forename: Tanya
authors.initials: T
authors.lastname: Smoother
authors.forename: Aiden A
authors.initials: AA
authors.lastname: Martin
authors.forename: Andrew M
authors.initials: AM
authors.lastname: McDonagh
authors.forename: Philip J
authors.initials: PJ
authors.lastname: Maynard
authors.forename: Chris
authors.initials: C
authors.lastname: Lennard
authors.forename: Claude
authors.initials: C
authors.lastname: Roux
mesh_terms: D000588:Amines; D003878:Dermatoglyphics; D005456:Fluorescent Dyes; D006801:Humans; D015394:Molecular Structure; D009829:Oleic Acids; D010569:Perylene / Q000031:analogs & derivatives; D011208:Powders; D013050:Spectrometry, Fluorescence; D013499:Surface Properties
chemical_list: D000588:Amines; D005456:Fluorescent Dyes; C525232:N,N-dioleyl-3,4,9,10-perylenedicarboximide; D009829:Oleic Acids; D011208:Powders; D010569:Perylene; C008703:oleylamine