Forensic applications of rare earths: Anticounterfeiting materials and latent fingerprint developers

Truccolo, Giada; Boseley, Rhiannon; Lewis, Simon W.; Gee, William J.

doi:10.1016/bs.hpcre.2020.07.001

Cited by 9 publications

(4 citation statements)

References 148 publications

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“…However, despite the increasing number of publications concerning this research area, only a few present all three desirable characteristics of size, luminescence, and surface functionalization. Recently, Kanodarwala et al (2019), Truccolo et al (2020) and Narasimhamurthy et al (2022) have published extensive reviews concerning the application of these materials for fingermark detection. Near infrared (NIR)-responsive upconversion fluorescent nanocrystals based on NaYF4:Yb,Er and NaYbF4:Er/Tm/Ho have been synthesized by M. Wang (2016) and used to develop latent fingermarks on the surfaces of various substrates.…”

Section: Fluorescent Nanoparticles: Bright Ideas For Latent Fingerpri...mentioning

confidence: 99%

From nanomaterials to macromolecules: Innovative technologies for latent fingerprint development

Assis

Costa

Alves

et al. 2022

WIREs Forensic Science

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The majority of conventional techniques for latent fingerprint enhancement are based on chemical reactions or interactions between the developer and fingermark residue components, providing contrast between the surface and the fingerprint ridges. However, these methods might be limited by factors associated with particle size, toxicity of the reagent, selectivity, or sensitivity, that may be circumvented by the synthetic design of innovative materials based on nanoparticles or macromolecular materials, such as conducting polymers, applied as latent fingerprint developers on different surfaces and conditions. Since the structural, optical and electronic properties of the material can be tailored by its molecular scale, the size control of the developer plays an important role to improve the interaction with the latent fingermark residue and/or the surface, enhancing the color contrast and the quality of the developed image (or dactylogram). Hence, creating new reagents and strategies to apply nano-and macromolecular scale materials as latent fingermark developers constitutes an exciting rapidly expanding area, generating a wealth of new materials that lead to forensic methodologies with enhanced performance.Recent progress in the application of such materials for development of latent fingermarks present on different surfaces and subject to complex circumstances will be discussed. This will focus on the main barriers to making nanoparticles and conducting polymers viable-and occasionally preferredmaterials routinely used by forensic experts, and the potential advantages over conventional methodologies in the acquisition and analysis of crime scene evidence.

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Section: Fluorescent Nanoparticles: Bright Ideas For Latent Fingerpri...mentioning

confidence: 99%

From nanomaterials to macromolecules: Innovative technologies for latent fingerprint development

Assis

Costa

Alves

et al. 2022

WIREs Forensic Science

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“…Recently, we reported the application of a commercially available lanthanide-doped (Eu 2+ , Dy 3+ ) strontium aluminate powder as a visible light phosphor for the visualization of latent fingermarks on troublesome substrates [1]. This, and other materials like it [2][3][4], emit exceptionally long-lived colored phosphorescence [5], particularly in shades of blue, aqua, and green [6]. Doped strontium aluminate powders have also been described as nontoxic and nonflammable according to OSHA [7], making this class of material an excellent precursor for forensic and security applications [5,8], however if processed into a nanomaterial, particularly with a dry, dispersible form, the health risks associated with inhalation and exposure will be increased [9].…”

Section: Introductionmentioning

confidence: 99%

“…This, and other materials like it [2–4], emit exceptionally long‐lived colored phosphorescence [5], particularly in shades of blue, aqua, and green [6]. Doped strontium aluminate powders have also been described as nontoxic and nonflammable according to OSHA [7], making this class of material an excellent precursor for forensic and security applications [5, 8], however if processed into a nanomaterial, particularly with a dry, dispersible form, the health risks associated with inhalation and exposure will be increased [9]. As a fingerprint powder, the benefits of lanthanide‐doped strontium aluminates include manufacture from a relatively low‐cost and easily accessible material, and the ability to charge the long‐lived phosphorescence using white light, which poses fewer hazards than more energetic wavelengths such as ultraviolet radiation.…”

Section: Introductionmentioning

confidence: 99%

Improving flow dynamics and storage longevity of a low‐cost phosphorescent fingerprint powder

Harrington,

Gee

2024

Journal of Forensic Sciences

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An inexpensive, commercially available doped strontium aluminate phosphor with long‐lived afterglow was prepared as a luminescent fingerprint dusting powder suited for challenging, highly patterned substrates; however, prolonged exposure to humidity was found to reduce that powder's affinity for fingermarks. Here, an enhanced preparation for synthesizing that fingerprint dusting powder is presented that prevents powder aggregation and loss of function upon exposure to humid environments. This was achieved by introducing a flow regulator during synthesis: hydrophobic silica SIPERNAT® D10 or SIPERNAT® D17. Increasing the hydrophobicity of the powder prevents aggregation by inhibiting the uptake of water, thereby improving the material's flow dynamics and transfer behavior from brush to fingermark. The angle of repose and flow characteristics made by the modified powders were quantified, with excellent affinity for fingermarks observed, even after being stored under 85% (±5%) humidity for 4 weeks. A preliminary comparison of the performance of the modified hydrophobic powders relative to the unmodified precursor revealed that more of the SIPERNAT® treated powder typically adhered to fingermarks while simultaneously imparting less background development. In addition, fewer clumps of particulate were observed in the developed fingermarks after addition of a hydrophobic flow regulator. This technical report outlines the updated method for synthesizing the fingerprint powder, with summarized flow performance results, and a demonstration of the modified powder's affinity for simulated fingermark evidence.

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“…Reports by [5,6] indicated that the absorbed energy is transferred to the neighboring luminescent impurities and emitted after a specific time of delay. According to [7], calcium, antimony, manganese and silver persistently glow after withdrawal of an incident radiation and thus find a large scientific application that require afterglow. Calcium and antimony compounds are widely applied to manufacture of battery anodes because they exhibit superior cycling stability with high charge retention capacity of 87.7 % [8].…”

Section: Introductionmentioning

confidence: 99%

Effect of the use of inorganic- based photoluminescent materials in solar energy devices application

Kimemia,

Kimemia, D. Njoroge,

Njoroge, W. K

et al. 2023

World J. Adv. Eng. Technol. Sci.

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The dynamic processes that take place in life require energy. The main convenient source of energy even in living tissue are hydrocarbons. This is due to the high-carbon based energy source that eventually converts fossil fuels. The preferred fuels as the primarily and industrial fuel contribute to the observed negative effects which emit pollutants to our environments and result to global warming. To mitigate such energy dependence, solar radiation has been exploited to produce clean energy through the use of photovoltaic cells. Nevertheless, natural radiation varies depending on the season of the year. This study investigated the properties of inorganic materials that support fluorescence after the source of light has been withdrawn. The minerals Sb/Ca/Mn/Ag were prepared hydrothermally to cultivate luminescent properties. The resulting products were characterized using Fourier Transformed Infrared (FTIR) spectroscopy and then applied to extend radiation in a photoactive material of a photocell. Optimal values of the prepared luminescent substance were established to produce the best generated potential in the fabricated solar cells when the natural radiation was withdrawn. Established receptive layer composites (KI/I2: CX) were inserted into a molding dice on top of the photosensitive layer and joined together by pressing. The ensued inorganic luminescent cells optical characteristics were observed under UV radiation (320 - 400 nm) wavelength which produced sequential varying colorations from brown, light blue, blue to red before diminishing gradually as the incident radiation was removed. The open circuit potential voltage (VOC) and current density (JSC) generated parameters were observed. The (0.45, 0.4, and 0.086) V residue potential resulted due to shifting of IR by SbNO3, Sb-PO4, Sb-CO3 and Sb-O luminescent materials. The dopants had promising properties for radiation delay in photo voltaic devices application.

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Forensic applications of rare earths: Anticounterfeiting materials and latent fingerprint developers

Cited by 9 publications

References 148 publications

From nanomaterials to macromolecules: Innovative technologies for latent fingerprint development

From nanomaterials to macromolecules: Innovative technologies for latent fingerprint development

Improving flow dynamics and storage longevity of a low‐cost phosphorescent fingerprint powder

Effect of the use of inorganic- based photoluminescent materials in solar energy devices application

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