JOURNAL OF FLUORESCENCE
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2024
·
IF 2.6
Li Maomao,Zhu Wenjie,Song Dongdong,Liang Zuoqin,Ye Changqing
Latent fingerprints (LFPs) is one of the most important physical evidence in the criminal scene, playing an important role in forensic investigations. Therefore, developing highly sensitive and convenient materials for the visualization of LFPs is of great significance. We designed and synthesized an organic fluorescent molecule TP-PH with aggregation-induced enhanced emission (AIEE) activity. By simply soaking, blue fluorescent images with high contrast and resolution are readily developed on various surfaces including tinfoil, steel, glass and plastic. Remarkably, LFPs can be visualized within 5 min including the first-, second- and tertiary-level details. In addition, TP-PH exhibits interesting photoactivated fluorescence enhancement properties. Under irradiation of 365 nm UV light with a power density of 382 mW/cm 2 , the fluorescence quantum yield displays approximately 21.5-fold enhancement. Mechanism studies reveals that the photoactivated fluorescence is attributed to the irreversible cyclodehydrogenation reactions under UV irradiation. This work provides a guideline for the design of multifunctional AIEE fluorescent materials.
研究领域:
材料科学
·
法医学
·
有机化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Ranran Kong,Sicheng Cao,Jincheng Zhang,Rongliang Ma,Li-Juan Fan
Finding a universal fingermark developing strategy effective for all types of fingermarks may improve the efficiency of forensic investigation. Here, we synthesized a fluorescent conjugated polymer (PTPEPE-IDA) with poly[p-(tetraphenylethene)-alt-(phenylene ethylene)] as the backbone and carrying pendant disodium iminodiacetate and monocarboxylate groups to interact with sweat, which is commonly present in fingermarks. PTPEPE-IDA was dissolved in ethanol to form the developing reagent, which was demonstrated to be effective in visualizing and enhancing sweat-containing sebaceous and blood fingermarks on various substrates with the same developing protocol. With the increase of the sweat content in fingermarks, the fluorescence intensity and clarity of patterns of the developed fingermarks increased. This strategy was effective for sweat-containing fingermarks aged for up to 100 days. The developed fingerprint has high stability, being recognizable after storage for 100 days or immersion in water (or ethanol). Mechanism investigation suggests that PTPEPE-IDA can bind some components in sweat and blood through synergistic effects of multiple interactions, and the aggregation-induced emission enhancement (AIEE) upon sweat was demonstrated by the macroscopic view and emission/absorption spectra, which is beneficial to detect the fingermark quickly and then enhance the legibility of the pattern. This universal strategy is expected to make fingermark development more efficient.
研究领域:
法医学
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材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
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2023
·
IF 4.8
Qi Nie,Jingjing Deng,Bing Xie,Tianshu Zhou
In this study, a novel solvent-assisted strategy was developed for the rapid and sensitive detection of kanamycin (KAN) based on glutathione-capped silver-doped gold nanoclusters (AuAg NCs). Ethanol solvent played a key role in disrupting the hydration shell of metal(I)-thiolate complexes in AuAg NCs. KAN, as a specific linker between AuAg NCs through electrostatic interaction and metal-amine coordination, induced the formation of large aggregates and thus triggered prolonged photoluminescence lifetime as well as strong luminescence enhancement by restricting molecular motions in AuAg NCs. The KAN-stimulated turn-on principle allows AuAg NCs to exhibit 4-fold sensitivity in 40% ethanol/water (V/V) mixed solution compared to that in water. The improved aggregation-induced-emission enhancement (AIEE) feature endows the AuAg NCs with selective recognition for KAN and realizes rapid detection in a short response time of 60 s with a low detection limit of 8.6 nM. By integrating AuAg NCs with a Pasteur pipette, a facile sample-to-answer test kit for on-site determination with low cost and high efficiency was constructed, offering potential applications in the timely analysis of contaminants in environmental emergencies.
研究领域:
分析化学
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环境科学
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纳米技术
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产品关联
DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
·
2020
·Vol. 41
·期 14
·2000198
·
IF 4.886
Xu Yu,Yan-Cai Gao,Hong-Wei Li,Yuqing Wu
Unlike normal conversion from aggregation caused quenching (ACQ) to aggregation induced emission enhancement (AIEE) by introducing aromatic rotors tuning aggregation modes, in this study, it is achieved through a supramolecular assembly with polymer. Thus, it provides an easy approach for the inhibition of unwanted H-aggregation between luminogens. As a kind of flavonoid, morin has shown great potential in therapeutics. However, its poor solubility and weak emission in aqueous solution greatly limit its bioapplications. When morin is dissolved in aqueous solution, the presence of 30 × 10 −6 m polyethyleneimine (PEI) induces significant emission enhancement and bathochromic shift. Consequently, the quantum yield (QY) of 24.5% is either achieved by assembling with PEI, versus 0.76% of its ACQ state composed of H-aggregation in aqueous solution. Particularly, the in-depth mechanism studies reveal that it is the assembly with PEI that disassociates the H-aggregation in aqueous solution and further restricts the stretching and/or rotation of morin, which eventually reduce the nonradiative decays and enhance the emission. Therefore, the present study reports a unique phenomenon of AIEE effects on morin. Particularly the in-depth investigation on intrinsic mechanisms will highlight and greatly expand the development of more luminogens from traditional Chinese herbals.
研究领域:
化学
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生物医学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2018
·Vol. 9
·期 46
·5521-5530
·
IF 4.927
Qiangjun Li,Yongjie Yuan,Lifang He,Shenglan Liu,Hailiang Zhang
Recently, multistimuli-responsive photo-luminescent materials have received more and more attention due to the basic theoretical research on them and their wide potential applications. In this article, we reported a new multistimuli-responsive luminescent monomer and its corresponding polymer materials based on an α-cyanostilbenic derivative. The prepared monomer and polymer exhibited aggregation-induced emission enhancement characteristics (AIEE). More importantly, they showed responsive behavior to temperature, UV irradiation and ionic strength. Their aqueous solution showed fluorescence thermosensitivity. At first, their luminescence intensity decreased slightly with the increasing temperature, and then their luminescence intensity enhanced greatly when the temperature increased to their lower critical solution temperature (LCST). With the further increasing of temperature, there was a significant decline in their luminescence intensity. They also exhibited different UV irradiation responsive behaviors in aqueous solution and THF solution. In aqueous solution, the LCST of their aqueous solution also changed after UV irradiation and their luminescence intensity increased first and then remained unchanged with increasing irradiation time. While in THF solution, their emission intensity decreased with UV irradiation time. The aqueous solution of the monomer and its corresponding polymer also exhibited obvious ionic strength response behavior. The LCST of their aqueous solution varied with the addition of different salts and the change rule was in good agreement with the Hofmeister effect and the emission intensity changed with the addition of salts.
研究领域:
材料科学
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化学
·
高分子科学
·
光化学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Zhen-Long Wu,Di Shi,Li Huang,Wen-Ying He,Xiang-Ying Sun,Bin Liu,Jiang-Shan Shen
A highly selective and sensitive probe 1b was successfully developed for detecting Hg 2+ ions in mixed aqueous medium with a “turn on” fluorescence mode, via a series of structural optimization of probes. These probes could be easily synthesized by one-step condensation reactions between o -phenylenediamine or 2, 3-diaminonaphthalene and o (salicylaldehyde), m , or p- hydroxybenzaldehyde. Introducing a certain amount of Hg 2+ ions the fluorescence of probes bearing one or two salicylaldehyde moieties including probes 1a, 1b, and 4 could be turned on. The fluorescent response is likely due to the well matching between Hg 2+ ions size and the geometric structure of probes, resulting in that probes bearing salicylaldehyde moiety are mostly favorable for binding with Hg 2+ ions by way of 1:1 molar ratio. These bindings likely facilitate excited state internal proton transfer (ESIPT) or ESIPT coupled aggregation-induced enhancement of emission (AIEE) process. Considering the sensitivity and the potential of practical application, probe 1b was chosen to establish a fluorescent enhancement sensing system towards Hg 2+ ions over other competing metal ions, with excellent limit of detection of 12.5 ppb.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 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）