Migration of latent fingermarks on non-porous surfaces

observation technique and nanoscale variations

Krastio T. Popov, V. G. Sears, Benjamin J. Jones

Research output: Contribution to journalArticle

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94 Downloads (Pure)

Abstract

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 4nm thick deposit; on day 1 after deposition this region extends approximately 2µm from the edge of the main ridge deposit and expands to a maximum of ~ 4µm 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.
Original languageEnglish
Pages (from-to)44–56
Number of pages13
JournalForensic Science International
Volume275
Early online date6 Mar 2017
DOIs
Publication statusPublished - Jun 2017

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Observation
Atomic Force Microscopy
Silicon
Vacuum
Islands
Gold
Metals
Growth

Cite this

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title = "Migration of latent fingermarks on non-porous surfaces: observation technique and nanoscale variations",
abstract = "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 4nm thick deposit; on day 1 after deposition this region extends approximately 2µm from the edge of the main ridge deposit and expands to a maximum of ~ 4µm 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.",
author = "Popov, {Krastio T.} and Sears, {V. G.} and Jones, {Benjamin J.}",
year = "2017",
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Migration of latent fingermarks on non-porous surfaces : observation technique and nanoscale variations. / Popov, Krastio T.; Sears, V. G.; Jones, Benjamin J.

In: Forensic Science International, Vol. 275, 06.2017, p. 44–56.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Migration of latent fingermarks on non-porous surfaces

T2 - observation technique and nanoscale variations

AU - Popov, Krastio T.

AU - Sears, V. G.

AU - Jones, Benjamin J.

PY - 2017/6

Y1 - 2017/6

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AB - 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 4nm thick deposit; on day 1 after deposition this region extends approximately 2µm from the edge of the main ridge deposit and expands to a maximum of ~ 4µm 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.

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