Gold nanoparticles, AuNPs, capped with mercaptocarboxylic acids followed by silver precipitation develop latent fingermarks on paper as high quality "negative" impressions. This effect stems from hydrogen bonding between the carboxylic group and the paper cellulose and may improve the yield of latent fingermarks since the results are less dependent on sweat composition.
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Article Synopsis
- Fingermarks are crucial evidence in forensics, used to identify or exclude suspects in criminal cases, and they're increasingly important in tech applications like unlocking devices and securing bank info.
- Current fingerprint development techniques don’t meet the needs of both traditional forensic work and modern technology.
- This paper introduces a new method using conductive paint and silicone to effectively develop, recover, and preserve different types of fingermarks, creating detailed casts that are useful for forensic analysis and compatible with fingerprint scanners on mobile devices.
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