Diacetylene copolymers for fingermark development

Grazia, Adrian De; Mikhael, Meena; Stojanovska, Natasha; Reedy, Brian; Shimmon, Ronald; Tahtouh, Mark

doi:10.1016/j.forsciint.2011.09.019

Cited by 9 publications

(19 citation statements)

References 17 publications

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“…Furthermore, the hydrochromic sensor film can be readily produced from commercially available diacetylene monomers. It should be noted that detection of latent fingerprint images using polymerizable diacetylenes was previously described49. The earlier study, however, focused on the development of latent ridge patterns.…”

Section: Discussionmentioning

confidence: 99%

Hydrochromic conjugated polymers for human sweat pore mapping

et al. 2014

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Hydrochromic materials have been actively investigated in the context of humidity sensing and measuring water contents in organic solvents. Here we report a sensor system that undergoes a brilliant blue-to-red colour transition as well as ‘Turn-On’ fluorescence upon exposure to water. Introduction of a hygroscopic element into a supramolecularly assembled polydiacetylene results in a hydrochromic conjugated polymer that is rapidly responsive (<20 μs), spin-coatable and inkjet-compatible. Importantly, the hydrochromic sensor is found to be suitable for mapping human sweat pores. The exceedingly small quantities (sub-nanolitre) of water secreted from sweat pores are sufficient to promote an instantaneous colorimetric transition of the polymer. As a result, the sensor can be used to construct a precise map of active sweat pores on fingertips. The sensor technology, developed in this study, has the potential of serving as new method for fingerprint analysis and for the clinical diagnosis of malfunctioning sweat pores.

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Section: Discussionmentioning

confidence: 99%

Hydrochromic conjugated polymers for human sweat pore mapping

et al. 2014

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“…The use of ungroomed fingermarks throughout this research not only ensures that the minimal amount of endogenous and exogenous components were present (highlighting the sensitivity of the technique), but they also allow for a greater amount of reproducibility to be maintained over extended periods of time in comparison to natural marks. Previous research regarding the enhancement of latent fingermarks deposited on polymer banknotes has been conducted using natural, groomed or eccrine fingermarks 6 , 11 , 41 which will generally contain a greater amount of variation and larger quantity of constituents relative to ungroomed fingermarks.…”

Section: Resultsmentioning

confidence: 99%

The analysis of latent fingermarks on polymer banknotes using MALDI-MS

Scotcher¹,

Bradshaw²

2018

Sci Rep

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In September 2016, the UK adopted a new Bank of England (BoE) £5 polymer banknote, followed by the £10 polymer banknote in September 2017. They are designed to be cleaner, stronger and have increased counterfeit resilience; however, fingermark development can be problematic from the polymer material as various security features and coloured/textured areas have been found to alter the effectiveness of conventional fingermark enhancement techniques (FETs). As fingermarks are one of the most widely used forms of identification in forensic cases, it is important that maximum ridge detail be obtained in order to allow for comparison. This research explores the use of matrix-assisted laser desorption/ionisation mass spectrometry (MALDI-MS) profiling and imaging for the analysis of fingermarks deposited on polymer banknotes. The proposed methodology was able to obtain both physical and chemical information from fingermarks deposited in a range of scenarios including; different note areas, depletion series, aged samples and following conventional FETs. The analysis of forensically important molecular targets within these fingermarks was also explored, focussing specifically on cocaine. The ability of MALDI-MS to provide ridge detail and chemical information highlights the forensic applicability of this technique and potential for the analysis of fingermarks deposited onto this problematic surface.

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“…Although Miller and Patel demonstrated more than 30 years ago that diacetylene copolymers could be used to develop oily fingermarks, the phenomenon was not studied more thoroughly until the recent research by De Grazia et al. . In the latter work, the suitability of using the copolymerization of 2,4‐hexadiyne‐1,6‐bis‐(phenylurethane) (HDDPU) and 2,4‐hexadiyne‐1,6‐bis( p ‐chlorophenylurethane) (HDDCPU) to develop fingermarks on a variety of surfaces was assessed.…”

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confidence: 99%

“…Detailed figures of the mechanism of polymerization including favorable packing parameters can be found in De Grazia et al. (Figs and ).…”

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confidence: 99%

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Refining Fingermark Development using Diacetylene Copolymers on Difficult Surfaces^,

Stojanovska

Grazia

Tahtouh

et al. 2014

Journal of Forensic Sciences

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In further work investigating the intriguing application of diacetylene copolymers in fingermark detection, methods were developed to control (inhibit or enhance) the diacetylene polymerization reaction in fingermarks treated with a mixture of the monomers 2,4-hexadiyne-1,6-bis-(phenylurethane) (HDDPU) and 2,4-hexadiyne-1,6-bis(p-chlorophenylurethane) (HDDCPU) in acetone solution. These methods included the use of a humidity chamber to reduce the amount of background development while promoting development on the fingermark, subjecting developed fingermarks to freezing temperatures and using a solvent to remove unreacted monomer in order to inhibit the polymerization reaction. Developed fingermarks were enhanced by conventional lighting (white light, filtered light) and fast Raman mapping, which was shown to be advantageous over FTIR imaging. This study also demonstrated the applicability of diacetylene copolymer solutions in the covert detection of fingermarks on difficult surfaces. Furthermore, fingermarks were successfully developed with good ridge detail on pig skin (used as a model for human skin, a notoriously difficult surface on which to develop fingermarks).

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Diacetylene copolymers for fingermark development

Cited by 9 publications

References 17 publications

Hydrochromic conjugated polymers for human sweat pore mapping

Hydrochromic conjugated polymers for human sweat pore mapping

The analysis of latent fingermarks on polymer banknotes using MALDI-MS

Refining Fingermark Development using Diacetylene Copolymers on Difficult Surfaces^,

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Diacetylene copolymers for fingermark development

Cited by 9 publications

References 17 publications

Hydrochromic conjugated polymers for human sweat pore mapping

Hydrochromic conjugated polymers for human sweat pore mapping

The analysis of latent fingermarks on polymer banknotes using MALDI-MS

Refining Fingermark Development using Diacetylene Copolymers on Difficult Surfaces,

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Refining Fingermark Development using Diacetylene Copolymers on Difficult Surfaces^,