Latent fingermark detection using functionalised silicon oxide nanoparticles: Investigation into novel application...

Area of Science:

• Forensic Science
• Materials Science
• Nanotechnology

Background:

• Previous research established carboxyl-functionalised silicon oxide nanoparticles (CES-SiO₂ NPs) doped with a ruthenium complex (RuBpy) for latent fingerprint development.
• These studies indicated that the optimized NP-based method offered superior selectivity and sensitivity for fingermark detection on non-porous surfaces.

Purpose of the Study:

• To evaluate the versatility and practicality of the optimized RuBpy-doped CES-SiO₂ NPs reagent for latent fingerprint detection and enhancement.
• To explore potential operational applications of the NP-based reagent, including multi-cycle treatments and spray applications.

Main Methods:

• The optimized RuBpy-doped CES-SiO₂ NPs reagent was applied in repeated cycles to assess enhancement.
• Spray application of the NP reagent was tested on various non-porous surfaces (aluminium foil, polypropylene, polyethylene films).
• Subsequent colloidal dispersion bath treatment was evaluated for further enhancement of spray-applied prints.
• Compatibility with two-step cyanoacrylate fuming was investigated.

Main Results:

• Repeated application of the NP-based method increased fingermark detection quality without significant risk of overdevelopment.
• Successful demonstration of spray application for operational use on diverse surfaces.
• Further enhancement of spray-detected fingermarks was achieved using a colloidal dispersion bath.
• The optimized NP method was found to be incompatible with two-step cyanoacrylate fuming.

Conclusions:

• The optimized RuBpy-doped CES-SiO₂ NPs reagent shows significant potential for enhancing latent fingerprint detection through multi-treatment and spray application methods.
• While promising for operational implementation, further optimization and comparative studies are necessary before widespread adoption in forensic settings.