Forensic Nanotechnology: Engineering Polyaniline Nanocomposites for Latent Fingerprints Development

Surface studies of developed fingerprints have aided in the elimination of criminal cases before moving to the court. The combination of X-ray photoelectron spectroscopy (XPS) with the aryldiazonium gold(III), 4-O 2 NC 6 H 4 N 2 + AuCl 4 -, surface modifier has shown to be a novel approach in latent fingerprint detection and development for the quantification of film elements.The robust gold-aryl film was developed on the reducing chemicals excreted in the sebaceous fingerprints without the need for external stimuli, and at lesser extent after contacting the free metal surface. The concurrent reduction of the diazonium functional group and gold(III) from[AuCl 4 ]developed a robust gold-aryl film which showed increasing gold(0) quantity in the time range 30 to 120 min over copper coins and model flat sheets. SEM and XRD support the presence of reduced gold on the top of the latent fingerprints and the presence of CuO resulting from the reaction of the diazonium salt with copper metal. This research combines the quantification of deposits using XPS, the surface sensitive technique for chemical analysis, in addition to the surface imaging.

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“…Recently, Lafi. et al 30 discussed a phenomenon that occurs when applying aryldiazonium salt solution on a metal surface for a prolonged period.…”

Section: Surface Study On Model Copper Sheetsmentioning

confidence: 99%

“…Copper Sheets. Recently, Lafi et al 30 discussed a phenomenon that occurs when applying an aryldiazonium salt solution on a metal surface for a prolonged period. The authors found that the salt solution may further react with the metal after initially binding with the fingerprint.…”

Section: Surface Study On Modelmentioning

confidence: 99%

Development of Latent Fingerprints via Aryldiazonium Tetrachloroaurate Salts on Copper Surfaces: An XPS Study

et al. 2019

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“…In addition, studies have shown that the copolymerization film formed by electrochemical oxidation of both polypyrrole and poly (3,4‐ethylene dioxythiophene) (PEDOT) monomers on stainless steel can facilitate us to obtain a higher level of latent fingerprint details [9c]. Besides, Mohamed's research group achieved fingermark imaging by using doped polyaniline (PANI) nanocomposites for dusting [11], which made polyaniline as an electrochromic material [12] an important step forward in the application of fingermark display. The aforementioned works encouraged us to pursue visualizing latent fingermarks in way of electrochromism.…”

Section: Introductionmentioning

confidence: 99%

Electrochromic Detection of Latent Fingermarks on Metal Surface Using 1,1′‐Dibenzyl‐4,4′‐bipyridinium Dichloride

et al. 2022

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The electrochromic detection of latent fingermarks on polished or unpolished, flat or curved metal surfaces is described using electrochromic material, 1,1'dibenzyl-4,4'-bipyridinium dichloride. The surface area covered by fingermarks acts as an insulating mask, causing 1,1'-dibenzyl-4,4'-bipyridinium dichloride to change color and produce inversed images of the fingermark. By changing the applied potential, the optical properties of 1,1'-dibenzyl-4,4'-bipyridinium dichloride can be continuously and reversibly adjusted to optimize the visual contrast of fingermarks, so as to realize the detection of latent fingermarks on stainless steel surface. It is demonstrated that the fabricated electrochromic devices can detect the fingermarks on these types of surfaces within twenty seconds at À 1.0 ~À 2.0 V. This work can qualify as a tangible improvement in fingermark detection of the natural fingermarks on the never-cleaned (more than 3 years) and curved surfaces of daily-used container, e. g. cup, and the handle of cleaning tool, mop.

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Role of Nanotechnology in Latent Fingerprint Development

Singh,

Pandit,

Nagar

et al. 2023

Friction Ridge Analysis

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Forensic Nanotechnology: Engineering Polyaniline Nanocomposites for Latent Fingerprints Development

Cited by 7 publications

References 0 publications

Development of Latent Fingerprints via Aryldiazonium Tetrachloroaurate Salts on Copper Surfaces: An XPS Study

Development of Latent Fingerprints via Aryldiazonium Tetrachloroaurate Salts on Copper Surfaces: An XPS Study

Electrochromic Detection of Latent Fingermarks on Metal Surface Using 1,1′‐Dibenzyl‐4,4′‐bipyridinium Dichloride

Role of Nanotechnology in Latent Fingerprint Development

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