Fluorescent TiO2 powders prepared using a new perylene diimide dye: applications in latent fingermark detection.
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.
Choi
Mi Jung
MJ
Centre for Forensic Science, University of Technology, Sydney, Australia.
Smoother
Tanya
T
Martin
Aiden A
AA
McDonagh
Andrew M
AM
Maynard
Philip J
PJ
Lennard
Chris
C
Roux
Claude
C
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
D000588:Amines; D005456:Fluorescent Dyes; C525232:N,N-dioleyl-3,4,9,10-perylenedicarboximide; D009829:Oleic Acids; D011208:Powders; D010569:Perylene; C008703:oleylamine