Migration of latent fingermarks on non-porous surfaces: Observation technique and nanoscale variations
| Autor: | Vaughn G. Sears, Krastio T. Popov, Benjamin Jones |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Silicon
Time Factors Materials science chemistry.chemical_element Intermediate region Mineralogy Microscopy Atomic Force 01 natural sciences Pathology and Forensic Medicine 03 medical and health sciences 0302 clinical medicine Microscopy Image Processing Computer-Assisted Humans 030216 legal & forensic medicine Dermatoglyphics Porosity Nanoscopic scale Deposition (law) Atomic force microscopy 010401 analytical chemistry 0104 chemical sciences chemistry Ridge (meteorology) Law |
| Zdroj: | Popov, K T, Sears, V G & Jones, B J 2017, ' Migration of latent fingermarks on non-porous surfaces : Observation technique and nanoscale variations ', Forensic Science International, vol. 275, pp. 44-56 . https://doi.org/10.1016/j.forsciint.2017.02.015 |
| ISSN: | 0379-0738 |
| Popis: | Latent fingermark morphology was examined over a period of approximately two months. Variation in topography was observed with atomic force microscopy and the expansion of the fingermark occurred in the form of the development of an intermediate area surrounding the main fingermark ridge. On an example area of a fingermark on silicon, the intermediate region exists as a uniform 4 nm thick deposit; on day 1 after deposition this region extends approximately 2 μm from the edge of the main ridge deposit and expands to a maximum of ∼4 μm by day 23. Simultaneously the region breaks up, the integrity is compromised by day 16, and by day 61 the area resembles a series of interconnected islands, with coverage of approximately 60%. Observation of a similar immediate area and growth with time on surfaces such as Formica was possible by monitoring the mechanical characteristics of the fingermark and surfaces though phase contrast in tapping mode AFM. The presence of this area may affect fingermark development, for example affecting the gold distribution in vacuum metal deposition. Further study of time dependence and variation with donor may enable assessment of this area to be used to evaluate the age of fingermarks. |
| Databáze: | OpenAIRE |
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