ChemistrySelect
·
2022
·Vol. 7
·期 35
·e202202252
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IF 2.307
Yayi Li,Di Peng
Graphical A hydrophobic binding-driven and fluorescence-free development of aged latent fingerprints using silane modified zinc oxide nanoparticles both in positive and reversed imaging mode is proposed, exhibiting the high contrast, high sensitivity, high selectivity and wide applicability. The requirement of nonfluorescent developers for aged latent fingerprint development is still of great urgency in forensic science. To enhance the specific interaction between fingerprint residue and nano-developers, a γ-methacryloxy propyl trimethoxyl silane (MPTS) modified zinc oxide nanoparticle (ZnO NP) was synthesized. The crystal structure, morphology, surface functional group, thermostability, UV/Vis spectra, photoluminescence and stability of sedimentation were characterized to prove the hydrophobicity, UV blocking nature and nonfluorescence of as-prepared MPTS-modified ZnO NPs. Additionally, after the specific surface area (SSA) of samples with different MPTS amount was analyzed by BET, a competitive adsorption mechanism between silane-ZnO bonding and silane oligomer-ZnO deposition was suggested. In the demonstration of latent fingerprint development, the powder dusting method was utilized on various surfaces both in positive and reversed imaging modes, exhibiting the high contrast, high sensitivity, high selectivity and wide applicability, even for aged fingerprints. Therefore, it provides a new strategy for fast, efficient and inexpensive development of older latent fingerprints in forensic analysis.
研究领域:
法医学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
Nanomaterials
·
2018
·Vol. 8
·期 8
·612
·
IF 3.504
Dan Zhao,Wenting Ma,Xincai Xiao
The recognition of fingerprints has played an extremely important role in criminal investigations, due to its uniqueness. This paper reports on the recognition of sweat latent fingerprints using green-emitting, environment-friendly carbon dots prepared with DL-malic acid and ethylenediamine, and the exploration of impacting factors in the development process of fingerprints. The experiments showed that better fingerprint images could be obtained when the latent fingerprints are developed in green-emitting carbon dots with pH 9 for 30 min, at room temperature. The reported method was also effective for latent fingerprints on a variety of substrates, as well as for those water-immersed ones, where the developed fingerprint remained stable after long-term preservation. Furthermore, the fluorescent three-dimensional fingerprint image could provide direct and simple evidence on pressing habits. The objective of this paper was to present this method. The method may help to narrow the range of suspects during criminal investigations and in forensic science.Keywords:green;carbon dots;sweat latent fingerprints;forensic science
研究领域:
化学
·
法医学
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DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3846
·
IF 4.2
Lei Huang,Jian Qian,Shijian Sun,Zheng Li,Dechuan Li
A novel method for synthesizing dumbbell-shaped (Gd1−xTbx)2O(CO3)2·H2O (GOC:xTb3+) phosphors using sodium carbonate was investigated. An amount of 1 mmol of stable fluorescent powder can be widely prepared using 3–11 mmol of Na2CO3at a pH value of 8.5–10.5 in the reaction solution. The optimal reaction conditions for the phosphors were determined to be 7 mmol for the amount of sodium carbonate and a pH of 9.5 in the solution. Mapping analysis of the elements confirmed uniform distribution of Gd3+and Tb3+elements in GOC:xTb3+. The analysis of fluorescence intensity shows that an optimal excitation wavelength of 273 nm is observed when the concentration of Tb3+is between 0.005 and 0.3. The highest emission intensity was observed for GOC:0.05Tb3+with a 57.5% maximum quantum efficiency. The chromaticity coordinates show that the color of GOC:Tb3+is stable and suitable for fluorescence recognition. Latent fingerprint visualization reveals distinctive features like whorls, hooks, and bifurcations. Therefore, the sodium carbonate method offers an effective alternative to traditional urea chemical reaction conditions for preparing GOC:Tb3+.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2024
·
IF 5.6
Chuanjun Yuan,Ming Li,Meng Wang,Jiaming Lv,Yifei Sun,Tianyi Lu,Yuxin Jia,Haijun Cao,Tianchun Lin
Latent fingerprints, as one of the most frequently encountered traces in crime scene investigation and also one of the largest sources of forensic evidence, can play a critical role in determining the identity of a person who may be involved in a crime. Due to the invisible characteristic of latent fingerprints, exploring efficient techniques to visualize them (especially the ones resided on metallic surfaces) while retain the biological and chemical information (e.g., touch DNA) has become a multidisciplinary research focus. Herein we reported a new and highly sensitive electrochemical interfacial strategy of simultaneously developing and enhancing latent fingerprints on stainless steel based on synchronous electrodeposition and electrochromism of manganese oxides in a neutral aqueous electrolyte . By utilizing a specially designed device for electrochemical testing and image capture, a series of electrochemical measurements, physical characterization and image analysis have been applied to evaluate the feasibility, development accuracy and enhancement efficacy of the proposed electrochemical system. The qualitative and quantitative analysis on the in situ and ex situ fingerprint images indicates that the three levels of fingerprint features can be precisely developed and effectively enhanced. Forensic DNA typing has also been performed to reveal actual impact of the proposed electrochemical system on subsequent analysis of touch DNA in fingerprint residues. The ratio of detected loci after electrochemical treatment reaches up to 98.5 %, showing non-destructive nature of this fingerprint development and enhancement technique.
研究领域:
法医学
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电化学
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材料科学
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
·
2022
·
IF 9.224
Chuanjun Yuan,Meng Wang,Ming Li,Pengrui Sun,Rongxuan Gao,Jiahao Tang
Latent fingerprints are invisible impressions that need to be developed before being used for individual identification. To advance fingerprint powdering, which is the most common method of developing latent fingerprints on nonporous substrates, two types of green-light-excited carbon dots (CDs) were synthesized hydrothermally using rhodamine 6G (R6G) and rhodamine B (RB) as the precursors. Under the physical effects of capillary attraction and coffee-ring effect, they were dispersed into hierarchical porous micron-sized diatomite (DE) in a facile, cost-effective, and eco-friendly way. The evolution of fluorescence characteristics from water-dispersed CDs to solid CDs/DE composite powders is clarified from the perspectives of physical properties and microstructures of the CDs and diatomite matrix. Optimized green fluorescent R6G-CDs/DE and yellow fluorescent RB-CDs/DE can be excited by visible light (green region) and show very high performance in fingerprint development under the luminescence modes, which has low phototoxicity and helps to preserve chemical information in fingerprint residues. Furthermore, image enhancement protocols, called “digital filters”, established based on qualitative and quantitative analyses of red, green, and blue (RGB) channel images of fluorescent fingerprints developed with the CDs/DE composite powders are very efficient in eliminating background interferences of challenging surfaces such as multicolored or patterned substrates. The as-prepared new materials for fingerprint development and the created methods for image enhancement show great promise in practical application scenarios.
研究领域:
法医学
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材料科学
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光学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 9
·6824-6830
·
IF 3.201
Guojuan Ren,Yuxi Meng,Qi Zhang,Mingyu Tang,Baoya Zhu,Fang Chai,Chungang Wang,Zhongmin Su
Nitrogen-doped carbon dots (NCDs) were synthesised using a simple and straightforward solvothermal method. The resulting spherical NCDs showed stable fluorescence and a prominent fluorescence quantum yield (67%) with an average size of 3.52 nm. The fluorescence of the NCDs was quenched effectively by mercury ions (Hg2+), exhibiting a detection limit of 0.65 μM. Upon addition of a saturated solution of ethylenediaminetetraacetic acid to a dispersion of the NCDs/Hg2+ complex, the fluorescence of the NCDs underwent significant immediate recovery. Due to their favorable biocompatibility, NCDs were also demonstrated to be efficient for HeLa cell imaging. The detection of Hg2+ by NCDs could be realized in environmental water samples and living cells, with excellent results. Moreover, the as-synthesized fluorescent NCD nanopowders were used for visualizating latent fingerprints (LFPs) with significant third level detail.
研究领域:
生物化学
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环境科学
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材料科学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Yining Ma,Guangyao Sun,Xinyu Meng,Keyu Shi,Chenxu Ge,Di Wu,Shidong Ji,Xun Cao
The application of fluorescent powders to latent fingerprints development can enhance the contrast and minimize background interference, resulting in high-quality fingerprint images. In this study, two metavanadate phosphors, CsVO 3 and RbVO 3 , were successfully prepared via solid-state methods, and their fluorescence properties were investigated. When employed for latent fingerprints detection, both CsVO 3 and RbVO 3 exhibited well-defined and distinct papillary ridges of the fingerprint patterns with clear detailed features on various objects with different background interferences, including impermeable substrates, semipermeable materials as well as permeable paper. Additionally, the color of the visualized fingerprint images could be adjusted from yellow to green by changing the wavelength of ultraviolet light from 365 nm to 254 nm, demonstrating greater adaptability and flexibility of CsVO 3 and RbVO 3 . Overall, both powders exhibited remarkable sensitivity, selectivity, and contrast with minimal background interference, revealing the potential of CsVO 3 and RbVO 3 for latent fingerprints development.
研究领域:
法医学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 9
·5543-5554
·
IF 4.22
Huang Mengjun,Peng Di
In forensic science, the demand for the discovery and extraction of latent fingermarks at crime scenes in a fast and convenient way is still urgent. Herein, a rutile Cr- and Sb-codoped TiO 2 nanoparticle was synthesized via homogeneous precipitation and was characterized by scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, Raman spectroscopy, and X-ray fluorescence. Subsequently, the as-prepared nanoparticle was used to visualize latent fingermarks using a powder dusting method and to enhance the visualization of bloody fingermarks using a small particle reagent method on porous, semiporous, and nonporous substrates. Notably, the anti-ultraviolet property of this yellow nanoparticle was investigated. This intriguing property contributed to the detection of latent fingermarks on strong-fluorescence or multicolored surfaces in a negative-image manner. Moreover, two potential interaction mechanisms were proposed between hemoglobin and surfactants in bloody fingermark enhancement. This work showed that this rutile TiO 2 nanoparticle doped with Cr and Sb is a versatile eikonogen for the rapid visualization of latent and bloody fingermarks and has high sensitivity, selectivity, contrast as well as wide applicability compared with traditional developing methods.
研究领域:
法医学
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材料科学
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纳米技术
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Bingyan Han,Dan Li,Xiangshan Lei,Qingdong Liu,Yajun Chen,Qifang Yan,Jiao Wang,Gaohong He
Aggregation-induced emission (AIE) materials have received a lot of attention in recent years, however, it remains a great challenge to develop a facile method for the conversion of aggregation-caused quenching (ACQ) molecules to AIE. In this paper, the ACQ molecule, 3,5-diacetyl-1,4-dihydro-2,6-lutidine (DDL), is successfully transformed from face-to-face stacking to slip stacking under the induction of H 2 O, achieving the transformation of ACQ molecule to AIE. Experimental analysis and theoretical calculations show that H 2 O is inserted into DDL molecules through hydrogen bonds, and its spatial configuration makes an angle between the H 2 O and DDL planes, thus increasing the horizontal and vertical distances between adjacent DDL molecules, so that DDL is arranged in a slip stacking pattern. Meanwhile, hydrogen bonds fix the DDL molecules in a relatively rigid structure, leading to the generation of other weak interactions, which further restrict the molecular motion and reduce the non-radiative transitions, so that the DDL possesses the AIE property, and the quantum yield increases from 0.95 % to 25.60 %. Based on the high fluorescence intensity of DDL-H 2 O, it has been successfully applied to the first-, second- and tertiary-level structures of latent fingerprints (LFPs) identification, which provides more possibilities for the practical application of ACQ molecules.
研究领域:
化学
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材料科学
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法医学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
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2022
·Vol. 12
·期 42
·27199-27205
·
IF 4.036
Xuejing Wang,Yinyan Yuan,YiXiao Sun,Xue Liu,Mingze Ma,Renyin Zhang,Feng Shi
The development of luminescent materials greatly affects the development of fluorescence imaging technology. The preparation of carbon dots (CDs) with high photoluminescence quantum yield (PLQY) in the solid-state is challenging due to excessive resonance energy transfer (RET) and direct π–π interactions. In this study, we synthesized carbon dots that exhibit green fluorescence (GCDs) with absolute PLQYs up to 35.65% in one step by a microwave-assisted method. In the solid-state, the absolute PLQY reached 19.25%. Then, the GCDs were mixed with soluble starch in appropriate proportions, which improved the adsorption and dispersion of the GCDs and greatly reduced the cost of the fingerprint powder, and increased the absolute PLQY of the fingerprint powder to 41.75%. Finally, we prepared GCDs for preliminary fabrication of luminescent films, and the GCD-starch powder was successfully applied to high-quality latent fingerprint (LFP) imaging. The related properties of GCDs and the LFP detection performance of fingerprint detection powders prepared by GCDs were studied in detail. The results showed that the LFP system developed with GCDs-starch powder visualized LFPs with high definition and contrast under different conditions, and GCDs had potential for application in light-emitting devices. This study developed a new type of solid-state luminescent CDs and demonstrated that these GCDs have great application potential for LFP detection. This study may also provide inspiration for other applications based on efficient solid-state fluorescence.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Houteng Zhao,Yilian Ran,Xiya Miao,Siyu Cheng,Dongze Li,Yufeng Du,Xiang Liu,Ruijin Yu
A series of novel phosphors, doping Eu 3+ and Na + ions in the Sr 3 MgNb 2 O 9 (SMNO) crystal lattice (SMNO: x Eu 3+ , x Na + , x = 0.5–30 mol%), was successfully synthesized through high-temperature solid-state reaction. X-ray diffraction (XRD) analysis and Rietveld refinement confirmed the successful synthesis of SMNO:Eu 3+ , Na + . The phosphor belongs to the hexagonal crystal system and the P 3 ¯ m 1 (No.164) space group. The bandgap energy of SMNO was calculated with Materials Studio and measured with the use of diffuse reflectance spectroscopy. The excitation spectrum of SMNO:Eu 3+ , Na + displays multiple narrow absorption peaks in the violet-blue region as well as a charge transfer band (CTB) near 300 nm, exhibiting the highest peak at 394 nm. Four distinct characteristic peaks are observed in the emission spectrum of SMNO:Eu 3+ , Na + . Notably, the peak at 601 nm shows the highest emission intensity due to the radiative transition from 5 D 0 → 7 F 2 . By varying doping concentrations, it was determined that an optimal concentration of 5 mol%Eu 3+ resulted in phosphors, with high color purity exceeding 99 %. Concentration quenching is attributed to the nearest neighbor ions interaction. Furthermore, SMNO:Eu 3+ , Na + exhibited good stability in 300–480 K, with luminescent intensity remaining 68.6 % at 420 K and 54.4 % at 480 K compared to room temperature (300 K). The internal quantum efficiency (IQE) of SMNO:5%Eu 3+ , 5 %Na + is 65.0 %. Both red and white light-emitting diodes (LEDs) were prepared using SMNO:Eu 3+ , Na + . The chromaticity coordinates of w-LED were measured as (0.357, 0.376), correlating to a correlated color temperature (CCT) of 4685 K and exhibiting a good color rendering index (CRI, R a = 88). Additionally, the latent fingerprint (LFP) development demonstrated clear visualization of Levels I-III characteristic structures of fingerprints when utilizing SMNO:Eu 3+ , Na + . These findings suggest promising applications for SMNO:Eu 3+ , Na + in w-LED lighting and LFP development.
研究领域:
材料科学
·
光学
·
法医学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Daomiao He,Likun Guan,Huayu Sun,Fanzhong Zeng,Fei Li,Leyi Zhang,Wenhao Li,Huajuan Deng,Dan Zhang,Ruijin Yu
A novel series of samarium-activated orange-red emitting CaY 2 Sb 2 (ZnO 4 ) 3 (CYSZO) phosphors has been successfully synthesized by the high-temperature solid-state method. The phase purity, spectroscopy, and morphological properties of the phosphors have been extensively characterized. When excited at 407 nm, CYSZO:Sm 3+ samples exhibited a pronounced orange-red emission peak at 610 nm, this corresponding to the typical 4 G 5/2 → 6 H 7/2 both magnetic-dipole and electric-dipole transitions of Sm 3+ ions. The optimal doping concentration was established as 10 mol%. The quenching mechanism is attributed to the interaction of the nearest-neighbor ions. The prepared sample showed a remarkable internal quantum efficiency (IQE) of 68.63 % and exceptional thermal stability at working temperature of the LEDs. As the Sm 3+ concentration increased, the decay time decreased correspondingly, ranging from 2.45 ms to 1.40 ms for concentrations ranging from 0.6 to 40 mol%. The phosphor materials exhibited high color purity, as evidenced by the Commission International de L'Éclairage (CIE) chromaticity coordinates. The synthesized white light-emitting diode (w-LED) exhibited an impressive color rendering index (CRI) of 96 and a desirable correlated color temperature (CCT) of 5674 K. Furthermore, the CYSZO:10 mol%Sm 3+ @oleic acid phosphor-stained latent fingerprint (LFP) images show excellent visualization capabilities on various surfaces with high contrast and long-term stability. These results highlight the potential of CYSZO:Sm 3+ phosphors to serve as a promising orange-red material for w-LED applications and LFP detection.
研究领域:
材料科学
·
光学
·
法医学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）