Latent Fingerprint Detection Using a Scanning Kelvin Microprobe

Williams, Geraint; McMurray, H. N.; Worsley, David

doi:10.1520/jfs15103j

Cited by 100 publications

(90 citation statements)

References 16 publications

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“…Scans were conducted immediately after the addition of electrolyte and thereafter at hourly intervals over a 24 h period using a reference probe-to-sample air gap of 100 m and recording 20 E corr data points per mm. Full details about the SKP instrumentation and calibration procedure employed in this work are given elsewhere [46,55]. Elemental maps of the underfilm surface were obtained using a Millbrook Instruments MC300 (Mk II) mini-SIMS fitted with a gallium ion source…”

Section: Methodsmentioning

confidence: 99%

Inhibition of corrosion-driven organic coating disbondment on galvanised steel by smart release group II and Zn(II)-exchanged bentonite pigments

Williams

McMurray

Loveridge

2010

Electrochimica Acta

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Section: Methodsmentioning

confidence: 99%

Inhibition of corrosion-driven organic coating disbondment on galvanised steel by smart release group II and Zn(II)-exchanged bentonite pigments

Williams

McMurray

Loveridge

2010

Electrochimica Acta

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“…Advances in nanotechnological techniques enable the use of new methodologies for making and augmenting crime scene identifications [13][14][15]. Research into nanostructured particles [4, 16,17] has helped develop techniques with improved latent fingerprint development, though efficacy remains surface dependent [4,17].…”

Section: Introductionmentioning

confidence: 99%

Effect of substrate surface topography on forensic development of latent fingerprints with iron oxide powder suspension

Jones

Downham

Sears

2010

Surface & Interface Analysis

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Latent fingerprint deposition and effectiveness of detection are strongly affected by the surface on which prints are deposited. Material properties, surface roughness, morphology, chemistry and hydrophobicity can affect the usefulness or efficacy of forensic print development techniques. Established protocols outline appropriate techniques and sequences of processes for broad categories of operational surfaces. This work uses atomic force microscopy and scanning electron microscopy to investigate a series of surfaces classified as smooth, non-porous plastic. Latent prints developed with iron oxide powder suspension are analysed on a range of scales from macro to nano to help elucidate the interaction mechanisms between the latent fingerprint, development agent and underlying surface. Differences between surfaces have a strong effect, even within this single category. We show that both average roughness and topographical feature shape, characterized by skew, kurtosis and lay, are important factors to consider for the processing of latent fingerprints.The pre-peer review version of this article is included in the following pages. Please access the publisher's website for the definitive version Effect of Substrate Surface Topography on Forensic Development of Latent Fingerprints AbstractLatent fingerprint deposition and effectiveness of detection are strongly affected by the surface on which prints are deposited. Material properties, surface roughness, morphology, chemistry and hydrophobicity affect the usefulness or efficacy of forensic print development techniques such as dry powder, powder suspension, cyanoacrylate fuming or vacuum vapour deposition, and lack of development agent adhering to deposited print as well as excess background staining are both problematic. The deposited fingerprint is further affected by the contact conditions and the individual donor. Additional factors affect the detection algorithm such as pre-and post-deposition environment of the surface, humidity, contamination and cleaning agent or solvent spray.This work uses atomic force microscopy and scanning electron microscopy to investigate a series of surfaces and the interaction between latent fingerprint, surface and development agent. Latent prints developed with various techniques are analysed on a range of scales from macro-to nano-to help to elucidate the mechanisms of fingerprint development and aims to aid detection technique enhancement and algorithm improvement.

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“…The SKP instrument used in our experiments has been described in detail elsewhere [16,17] and incorporated a 125 m diameter gold wire reference probe vibrated normal to the sample surface with amplitude 40 m, frequency 280 Hz and a mid-amplitude probe-sample distance of 100 m. SKP calibration using freestanding PVB/PAni (ES and EB) films in contact with Cu/Cu (aq) 2+ , Fe/Fe (aq) 2+ and Zn/Zn (aq) 2+ couples was found to follow the relationship,…”

Section: Methodsmentioning

confidence: 99%