Technical note: latent fingermarks, colloidal gold and multimetal deposition (MMD)

Schnetz, Bertrand; Margot, Pierre

doi:10.1016/s0379-0738(00)00361-3

Cited by 89 publications

(78 citation statements)

References 6 publications

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“…In addition, it is also compatible with the previously detecting techniques of bloody latent fingerprints. Work is in progress to extend this approach to image latent fingerprints enhanced by a process known as ''MultiMetal-Deposition'' (MMD) where gold nanoparticles adhere to the fingerprint residue and catalyze the precipitation of metallic silver from the silver physical developer solution [40][41][42].…”

Section: Discussionmentioning

confidence: 99%

Fingerprint imaging by scanning electrochemical microscopy

Zhang

Girault

2007

Electrochemistry Communications

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An efficient strategy for visualizing human fingerprints on a poly(vinylidene difluoride) membrane (PVDF) by scanning electrochemical microscopy (SECM) has been developed. Compared to a classical ink fingerprint image, here the ink is replaced by an aqueous solution of bovine serum albumin (BSA). After placing the ''inked'' finger on a PVDF membrane, the latent image is stained by silver nitrate and the fingerprint is imaged electrochemically using potassium hexachloroiridate (III) (K 3 IrCl 6 ) as a redox mediator. SECM images with an area of 5 mm · 3 mm have been recorded with a high-resolution using a 25-lm-diameter Pt disk-shaped microelectrode. Pores in the skin (40-120 lm in diameter) and relative locations of ridges were clearly observed. The factors relevant to the quality of fingerprint images are discussed.

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Section: Discussionmentioning

confidence: 99%

Fingerprint imaging by scanning electrochemical microscopy

Zhang

Girault

2007

Electrochemistry Communications

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“…2b and 2c. These data show that a fast scan rate of 300 mm s 21 provides a better resolution as the spreading of the diffusion field of IrCl 6 22 is large at a low scan rate resulting in image blurring. Comparing with Fig.…”

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confidence: 84%

SECM imaging of MMD-enhanced latent fingermarks

et al. 2007

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Scanning electrochemical microscopy (SECM) has been used to image latent fingermarks enhanced by adsorption of gold nanoparticles onto which silver is chemically deposited, a process known as ''multi-metal-deposition'' (MMD).When a finger touches a surface, secretions are deposited leaving an impression of the finger's ridge pattern, referred to as a latent fingermark, which requires physical or chemical treatments to enable visualization. Fingermarks are still most widely used for personal identification. 1 They provide valuable physical evidence of contact between a finger and a surface. For years, forensic scientists have been seeking new methods or trying to improve existing methods for the visualization of latent fingermarks. The structured combination of optical methods (diffused reflection, luminescence, UV absorption and reflection), physical methods (powdering, small particle reagent, vacuum metal deposition), physico-chemical methods (physical developer, multi-metal-deposition (MMD), iodine, cyanoacrylate) and chemical methods (ninhydrin and its analogues, DFO, etc.) permits a rational and highly efficient processing of the secretions deposited by the fingers on a great variety of substrates. 2 To visualize these developed fingermarks, alternative light sources (such as Crimescope or Polilight) or laser-based detection methods are commonly used. However, these optical methods do not work in all possible cases, and certain types of latent fingermarks or object surfaces may be problematic. The major challenges in fingermark detection with laser techniques stem from both low emission levels from the fingermark secretions and interferences from the background signal, for example the background fluorescence when imaging a fingermark on bank notes. Up to now, no electrochemical imaging method has been reported to detect the latent fingermarks.Scanning electrochemical microscopy (SECM), a scanning probe technique, has been developed into a powerful technique for the kinetic measurements of localized processes at solid-liquid or liquid-liquid interfaces, for high-resolution imaging of the chemical activity and/or topography of various interfaces on a localized scale, and for microfabrication. 3 In SECM experiments, the probe is a noble metal microelectrode brought to the vicinity of the substrate surface, where the amperometric response (either for an oxidation or a reduction process) that depends on the electrochemical reactivity of the substrate is recorded as a function of the lateral probe position (x, y) for imaging. SECM is able to resolve differences on the micron or sub-micron length scale, an advantage which is clear in many reported applications. 4 We have previously shown that SECM could be used in the feedback mode to image silver or copper stained proteins, by generating at the microelectrode an oxidizer to oxidize these metals. 5 These reports proved the feasibility of using SECM for imaging protein spots on a membrane surface. Very recently, we have shown that SECM combined with silver stainin...

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“…Nanotechnology has proved to give unbiased results once the investigating body has his hands full of evidences and once he involves nanotechnology in his investigation the outcome will be accurate and unbiased and within a short span of time [7][8][9] . The novel methods or the conventional methods which were involved in past or at present also for investigating a crime scene like the smidgen method which used to reveal the finger prints or the use of fluorescent x-ray tubes can be replaced with the help of new scientific techniques like Microbial Forensics, Forensic Palynology as well as the Nanotechnology [10][11][12] . Nanoparticles today have begun to get incorporated in the process of polymerase chain reaction-amplification due to their unique ability to create physical and chemical properties based on what may be present on the surface [12][13][14] .…”

Section: Article Reviewmentioning

confidence: 99%

“…The novel methods or the conventional methods which were involved in past or at present also for investigating a crime scene like the smidgen method which used to reveal the finger prints or the use of fluorescent x-ray tubes can be replaced with the help of new scientific techniques like Microbial Forensics, Forensic Palynology as well as the Nanotechnology [10][11][12] . Nanoparticles today have begun to get incorporated in the process of polymerase chain reaction-amplification due to their unique ability to create physical and chemical properties based on what may be present on the surface [12][13][14] . The word PCR refers to the polymerase chain reaction which is a common method of creating copies of DNA-fragments.…”

Section: Article Reviewmentioning

confidence: 99%

Applications of Nanotechnology in Forensic Investigation

Chauhan¹,

Singh²,

Tiwari³

2017

IJLSSR

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ABSTRACT-Nanotechnology as a new area of research, which involves the revealing of cases and evidences before the court of interest whenever it is obligatory. This area of research has its own significant interest as the advances in the field of nanotechnology are being incorporated in the field of forensic science. Only large collections of strains from all over the world and high quality sequence data will provide the basis for meaningful results in microbial forensic investigations. International and interdisciplinary cooperation will improve our capabilities to rapidly identify the agents, elucidate the source, and provide these results as evidence in court. Since the last few decades, fingerprints from pollen have become the dominion of many forensic scientists throughout the world, and have proven to be the main ingredient of one of the most powerful techniques in trace and contact evidence-Forensic Palynology. Nanotechnology is likely to play a major role in the future in the field of forensic science to deliver more selective and more sensitive ways to detect and reveal cases along with infallible evidences.

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Technical note: latent fingermarks, colloidal gold and multimetal deposition (MMD)

Cited by 89 publications

References 6 publications

Fingerprint imaging by scanning electrochemical microscopy

Fingerprint imaging by scanning electrochemical microscopy

SECM imaging of MMD-enhanced latent fingermarks

Applications of Nanotechnology in Forensic Investigation

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