Issue 16, 2024

Electrochromic visualization of latent fingermarks deposited on nonconductive surfaces

Abstract

Electrochromic visualization of latent fingermarks has already been achieved on conducting surfaces such as stainless steel. However, their enhancement on non-conducting surfaces such as glass via electrochromism has not been reported. Considering the non-conductive nature of substrates, a layer of gold was introduced to the fingermark-bearing surfaces, in which gold was used as the cathodes to assemble electrochromic devices for visualization. The contact between gold nanoparticles of the as-obtained conducting layer in the fingermark region should be affected by the height difference within the fingermark, leading to conductivity differences, which give rise to coloration differences in electrochromic devices. It is demonstrated that 1,1′-dibenzyl-4,4′-bipyridinium dichloride can be used as the electrochromic chromophore for the visualization of latent fingermarks deposited on nonconducting surfaces, and the primary and secondary characteristic information can be obtained. The electrochromic visualization herein solves the problem of electrochromically enhancing latent fingermarks on non-conducting surfaces.

Graphical abstract: Electrochromic visualization of latent fingermarks deposited on nonconductive surfaces

Article information

Article type
Paper
Submitted
01 Mai 2024
Accepted
11 Jun 2024
First published
11 Jun 2024

Analyst, 2024,149, 4187-4192

Electrochromic visualization of latent fingermarks deposited on nonconductive surfaces

Y. Kong, X. Shi, M. Wang, W. Chen, L. Li, L. Zhang and D. Xiao, Analyst, 2024, 149, 4187 DOI: 10.1039/D4AN00632A

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