One Step to Detect the Latent Fingermarks with Gold Nanoparticles

摘要

Hitherto, fingermarks constitute one of the most important categories of physical evidence in the forensic science. Within the past decades, methods of visualization of fingermarks have been developed significantly. Recently, nanoparticles were widely used in this filed, e.g. CdS [1], CdTe [2], SiO2 [3] AuNPs. Multi-metal deposition method (MMD), as a useful mean to detect latent fingermarks on porous and non-porous items, was first proposed by Saunders in 1989 [4]. It is a two-step wet chemical process for latent fingermarks detection, combining the principles of small particles reagent with AuNPs and following a silver physical developer (AgPD). Schnetz and Margot took further studies on MMD procedure, yielding better results by using smaller AuNPs [14]. They explored the influence of particle size, pH value, and concentration of the colloidal gold solution on detecting latent fingermarks.