Evaluation of diazonium gold(III) salts in forensic chemistry: Latent fingerprint development on metal surfaces

Interpol review of fingermarks and other body impressions 2016–2019

“… Preliminary/Pilot studies : Various approaches were proposed to detect fingermarks on cartridge cases or other metallic surfaces: molecular complexes composed of l -alanine and conventional amino acid reagents (i.e., DFO, IND, MTN, and NIN) applied to brass and fired cartridges [ 429 ]; co-electrodeposition of silver and copper particles in deep eutectic solvent (mix of choline chloride and ethylene glycol), the secretion residue acting as a mask [ 430 ]; gel-based electrolytes (calcium chloride and potassium permanganate) applied to stainless steel and aluminium [ 431 ]; deposition of potassium birnessite (oxide mineral of manganese) on unfired cartridges and flat metal surfaces, the secretion residue acting as a mask [ 432 ]; electrostatic adsorption using a modified portable high-low voltage self-discharge device, applied to unfired brass cartridges [ 433 ]; nanoconjugate composed of carbon nanotubes, Candida rugosa lipase and safranin, applied in suspension on immersed stainless steel knives [ 410 ]; SKP and SEM/EPMA imaging of latent and VMD-processed fingermarks on metallic surfaces [ 434 ]; ToF-SIMS applied to flat metallic surfaces [ 435 ]; modified VMD process involving the deposition of gold followed by zinc, ZnS, or ZnO on aluminium [ 436 ]; and in situ reduction of aryldiazonium gold (III) salts induced by human sweat, applied to flat metallic surfaces [ 437 ]. Metal corrosion : Cooper-Dunn et al.…”

Diazonium Gold Salts as Novel Surface Modifiers: What Have We Learned So Far?

“…− salt was applied with different concentrations to copper, lead, and aluminum surfaces using the components of human sweat as the reducing agent to construct gold deposits on the eccrine fingerprints [36]. The adsorbed gold-aryl film on the metal surfaces showed well-separated ridges of the latent fingerprints in the SEM measurements ( Figure 5).…”

“…Images were taken using stereomicroscope with a 3 MP camera and magnification of 25×-50×. Reprinted with permission from [36]. © 2020 Elsevier B.V. All rights reserved.…”

“…Tertiary details of fingerprints developed by 0.001 M of [4-NO 2 -C 6 H 4 N 2 ] + AuCl 4 − salt dissolved in 5% acetonitrile: 95% ethanol solvent after contact for 2 h with (a) Cu surface showing incipient ridges, (b) Pb surface showing smooth edges and (c) Al surface showing some scar structures.Images were taken using stereomicroscope with a 3 MP camera and magnification of 25×-50×. Reprinted with permission from[36]. © 2020 Elsevier B.V. All rights reserved.…”

Spontaneous redox route for gold‐aryl film development of latent fingerprints on nickel coins

“…[5][6][7][8][9][10] Recently, we investigated aryldiazonium tetrachloroaurate (III) salts as developers for latent fingerprints collected on several metals such as aluminum, lead, and copper. 11 Compiled data suggested that the salts are excellent modifiers on copper surfaces but no other metals due to their high reduction ability that resulted in poor quality development over the fingerprint. The cleavage of molecular nitrogen as bubbles and the immediate development can be seen.…”