JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
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2020
·
IF 3.306
Zhifeng Cai,Siying Chen,Xinru Ma,Dang Na,Jie Zhao,Tianqi Wu,Caifeng Zhang
For the first time, we developed a facile, green and low-cost strategy to prepare blue-green emitting fluorescence copper nanoclusters (Cu NCs) by using tyrosine as a protecting agent and hydrazine hydrate as a reducing agent. The tyrosine-protected Cu NCs (Tyr-Cu NCs) were analyzed through fluorescence spectroscopy, UV–vis absorption spectroscopy, fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The as-prepared Cu NCs was well dispersed and possessed good water solubility, excellent photostability and resistance to sodium chloride. The fluorescence intensity of Tyr-Cu NCs (around 480 nm under the excitation wavelength of 435 nm) was obviously quenched in the presence of rutin. According to this characteristic, a selective and sensitive fluorescence analytical method for the determination of rutin was established. The analytical method had a good linear relationship between F 0 /F and the concentrations of rutin (range from 0.1–60 μM) and the detection limit (LOD) was 0.016 μM. The possible mechanism of fluorescence quenching was caused by the IFE and static quenching. Meaningfully, the fluorescent probe was successfully employed to detect rutin in bovine serum samples.
研究领域:
分析化学
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生物医学
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产品关联
DOI
高影响因子
LUMINESCENCE
·
2019
·Vol. 34
·期 7
·767-773
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IF 1.691
Chunlei Ma,Wensheng Ren,Jianke Tang,Xiaoli Wang,Dongxin Ji,Rongqian Meng,Cuihong Zhang,Qi Wang
Taking advantage of the compelling properties of d -penicillamine ( d -PA) combined with copper, a method for the sensitive and selective determination of d -PA was established using copper nanocluster (Cu NC)-based fluorescence enhancement. d -PA molecules containing a thiol compound showed a strong tendency to combine with the surface of Cu NCs, causing the re-dispersion of nanoclusters and therefore fluorescence intensity was enhanced. Fluorescence enhancement efficiency of Cu NCs induced by d -PA was linear, with the d -PA concentration varying from 0.6–30 μg ml −1 (R 2 = 0.9952) and with a detection limit of 0.54 μg ml −1 . d -PA content in human urine samples was detected with recoveries of 104.8–112.99%. Fluorescence-enhanced determination of d -PA using Cu NCs was established for the first time and this rapid, easy and sensitive method should attract much attention for this application.
研究领域:
分析化学
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2019
·
IF 0
Weiru Dong,Congming Sun,Mingtai Sun,Hongwei Ge,Abdullah M. Asiri,Hadi M. Marwani,Runyan Ni,Suhua Wang
In this work, fluorescent copper nanoclusters (CuNCs) have been fabricated with ascorbic acid (AA) as reductant and polyvinyl pyrolidone (PVP) as scaffold in aqueous solution for the on-site detection of hypochlorous acid (HClO) with high sensitivity and selectivity. The CuNCs showed a specific fluorescence quenching toward HClO compared with other reactive oxygen species and ions that are found widely in the environment. The CuNCs also exhibited a good linear fluorescence quenching effect on HClO with a limit of detection at 55 nM. The mechanism has been investigated and was attributed to the oxidation of reduced Cu on the surface of CuNCs by HClO. Surprisingly, the fluorescence intensity of the probe was more responsive to HClO in the presence of excessive iodide ions (I–), with a lower detection limit of 19 nM. In acidic conditions, iodine (I2) was generated by HClO oxidation and subsequently reacted with Cu atoms on the surface of CuNCs to form cuprous iodide (CuI) precipitation. This resulted in surface defects on the CuNCs, which further significantly reduced the fluorescence intensity of the CuNCs. Under the influence of the reaction mechanism, the order of excessive I– and HClO addition affects the linear range and detection limit of the probe. Because these CuNCs have shown excellent performance as a fluorescent probe, they have been further successfully applied for real-time quantitative detection of HClO in practical samples, and I– can also be used as a “sensitizer” in HClO sensing.
研究领域:
分析化学
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生物化学
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产品关联
DOI
CHEMICAL PAPERS
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2019
·Vol. 74
·期 6
·1831-1838
·
IF 1.246
Cai Zhifeng,Zhang Caifeng,Jia Kang
A fast, simple, green and low-cost synthesis method in aqueous solution was successfully established for the preparation of l -tyrosine protected Cu nanoclusters (Cu NCs). Subsequently, the as-prepared Cu NCs was characterized by UV–vis absorption spectroscopy, fluorescence spectroscopy, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). It exhibited good water solubility, excellent photostability and high stability toward high concentration of sodium chloride. The Cu NCs revealed maximum excitation and emission peaks at 430 and 477 nm, respectively. Importantly, the Cu NCs showed a rapid response, a liner relation over the pH ranges from 5.02 to 11.92 and could be repeated for five consecutive cycles without fluorescence decay. Further, the as-prepared Cu NCs was applied for the determination of pH value in water samples. Simultaneously, all above features showed that l -tyrosine protected Cu NCs had great potential for sensing of pH in biological field.
研究领域:
生物化学
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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
MICROCHEMICAL JOURNAL
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2019
·
IF 3.206
Qiqi Tan,Juan Qiao,Rongyue Zhang,Li Qi
Papaya juice protected copper nanoclusters was depicted for detection of serum l -histidine. The fluorescent probe was synthesized by using a simple “one pot” hydrothermal preparation strategy with papaya juice playing dual roles both as a green reductant and stabilizer. The excitation and emission peaks of the copper nanoclusters were at 400 nm and 490 nm, respectively. The fluorescence was turned-on in addition of l -histidine due to the enhanced surface electron density. The fluorescent intensity increased linearly with l -histidine concentration ranging from 2.0 to 50.0 µM. The proposed copper nanoclusters was further applied to determine l -histidine in rat serum after intraperitoneal injection.
研究领域:
生物化学
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分析化学
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产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
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2022
·Vol. 29
·期 13
·e202203554
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IF 5.02
Yi Zhang,Zhangdi Lu,Anrui Feng,Jacky W. Y. Lam,Zhenguang Wang,Yu-e Shi,Ben Zhong Tang
Graphical Green-emissive copper nanoclusters (Cu NCs) were synthesized at a relatively high reaction temperature (80 °C) and an extended reaction time to 144 h. The photoluminescence of Cu NCs could be selectively enhanced by adding Al 3+ , attributed to their aggregation-enhanced emission features. Selective detection of Al 3+ is of great significance both for the benefit of human health and environmental safety considerations. In this work, a sensitive and selective fluorescence assay for Al 3+ was proposed based on the green-emissive Cu nanoclusters (Cu NCs). Different from the commonly reported works, the green emissive Cu NCs showed dual emission bands at 450 and 510 nm, attributed to the reaction product between polyvinyl pyrrolidone and ascorbic acid and the Cu core, respectively. Al 3+ could induce the aggregation of Cu NCs by forming covalent bonds, which results in the enhancement of photoluminescence intensity. This enhancement phenomenon is rather selective to Al 3+ , which endows the detection in real samples. These results provide new insights for the fluorescence mechanisms of metal NCs, which also provided a functional luminescent material for various applications, such as chemical sensing, bioimaging and photoelectric devices.
研究领域:
材料科学
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分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
LUMINESCENCE
·
2017
·Vol. 32
·期 6
·1092-1099
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IF 1.509
Tingting Luo,Shiting Zhang,Yujue Wang,Meina Wang,Mei Liao,Xingming Kou
In this paper, an innovative and facile one-pot method for synthesizing water-soluble and stable fluorescent Cu nanoclusters (CuNCs), in which glutathione (GSH) served as protecting ligand and ascorbic acid (AA) as reducing agent was reported. The resultant CuNCs emitted blue-green fluorescence at 440 nm, with a quantum yield (QD) of about 3.08%. In addition, the prepared CuNCs exhibited excellent properties such as good water solubility, photostability and high stability toward high ionic strength. On the basis of the selective quenching of Hg 2+ on CuNCs fluorescence, which may be the result of Hg 2+ ion-induced aggregation of the CuNCs, the CuNCs was used for the selective and sensitive determination of Hg 2+ in aqueous solution. The proposed analytical strategy permitted detection of Hg 2+ in a linear range of 4 × 10 −8 to 6 × 10 −5 M, with a detection limit of 2.2 × 10 −8 M. Eventually, the practicability of this sensing approach was confirmed by its successful application to assay Hg 2+ in tap water, Lotus lake water and river water samples with the quantitative spike recoveries ranging from 96.9% to 105.4%.
研究领域:
分析化学
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环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
TALANTA
·
2016
·
IF 4.035
Xue Hu,Wei Wang,Yuming Huang
In this study, Hg 2+ ions were found to quench the fluorescence of glutathione (GSH)-capped copper clusters (Cu NCs). The Cu NCs were prepared by a simple reduction of CuSO 4 in the presence of GSH serving both as a reducing and protecting agents, and characterized by ultraviolet–visible absorption spectroscopy (UV–vis), high resolution scanning electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray photoelectron spectrometer (XPS). The GSH-Cu NCs displayed a small size, excellent water-dispersibility, good storage stability, good photostability and were stable in the presence of high concentrations of salt. The GSH-Cu NCs possessed strong blue fluorescence with a quantum yield of 10.6% and exhibited an excitation-independent fluorescence behavior. The zeta potential , TEM, resonance light scattering and dynamic light scattering measurements demonstrated that the Hg 2+ ion-induced aggregation of the Cu NCs contributed to the fluorescence quenching of the dispersed Cu NCs. On these findings, a sensitive and selective fluorescent probe was developed for detecting Hg 2+ in the linear range from 10 nM to 10 μM with a detection limit of 3.3 nM (S/N=3). The proposed method has been successfully applied to determine Hg 2+ content in water sample and food stuff. The results of the proposed method were in good agreement with those obtained by a hydride generation atomic fluorescence spectrometry (HG-AFS).
研究领域:
分析化学
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环境科学
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食品科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Shujin Zhou,Kai Sheng,Na Zhang,Han Zhang,Hongguang Li,Panpan Sun,Xia Xin
Metal nanoclusters (NCs) have attracted much attention due to their ultrasmall sizes and unique electronic structures. In recent years, the light-induced reversible assembly of Au NCs is already reported. However, to achieve light-triggered reversible self-assembly of Cu NCs is still challenging. Herein, we prepared photoresponsive Cu NCs by using an azo-containing ligand, i.e., 3,5-dimethyl-4-(phenyldiazenyl)-1H-pyrazole) (abbreviated to Hazopz). Each nanocluster contains three Cu(I) in the core and has atomic precision (denoted as Cu 3 -NCs hereafter). Self-assembly of Cu 3 -NCs into nanofibers occurred in binary solvent mixture with toluene as a good solvent and methanol (MeOH) as a poor one. When the suspension containing the nanofibers was irradiated by UV light, the originally straight nanofibers became bent. This morphological change is mainly due to the isomerization of the peripheral azo groups of the Cu 3 -NCs from trans- to cis -conformation, and to a small extent ascribed to the increased solubility of the cis -conformation of the azo groups in the binary solvent. The disassembled aggregates can reassemble and the bent nanofibers can become straight again when exposed to visible light. This process can be repeated for at least three times, indicating the high reversibility of this light-triggered morphological change of Cu 3 -NCs. The one-dimensional self-assemblies with light-triggered, reversible morphological changes achieved in this work can be potentially used as a medium material in an optical information storage device, and can write and erase information through the irradiation of UV light and visible light.
研究领域:
材料科学
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化学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Yi Zhang,Qingbo Deng,Chang Tang,Minglu Zhang,Zilong Huang,Zhifeng Cai
Development of excellent sensors to determine trace concentrations of rifampicin is of intense importance for medicine analysis and human health. Herein, a facile and green fluorescent probe was established for the determination of rifampicin by using folic acid protected copper nanoclusters (FA-Cu NCs). Many characterization methods were applied for the analysis of the as-prepared FA-Cu NCs including UV–visible absorption spectra, fluorescence spectra, Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), fluorescence lifetime and X-ray photoelectron spectroscopy (XPS). The TEM image suggested that the as-prepared FA-Cu NCs were highly dispersed. The as-synthesized FA-Cu NCs emerged blue fluorescence under UV light and demonstrated maximum emission wavelength at 446 nm under the maximum excitation wavelength of 358 nm. After the addition of rifampicin, the FL intensities of FA-Cu NCs were uncommonly quenched. The related experimental data intimated that the quenching mechanisms were assumed to the inner filter effect (IFE) and static quenching. The as-proposed probe platform displayed an obvious linear relationship with rifampicin concentrations varying from 0.5 to 100 µM, and the corresponding detection limit (LOD) was 0.073 µM (S/N = 3). Finally, the as-established detection platform was successfully employed to analyze trace concentrations of rifampicin in real samples.
研究领域:
分析化学
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医学检测
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纳米技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL PAPERS
·
2021
·Vol. 75
·期 8
·3761-3769
·
IF 2.097
Zhang Shen,Li Junhong,Huang Suiyuan,Ma Xinru,Zhang Caifeng
As an effective way to detect quercetin (Que), it was important to synthesize fluorescent probe with excellent performance by simple method. In this work, the facile one-pot approach was successfully developed to prepare blue-emitting copper nanoclusters (Cu NCs) by protection of polyethyleneimine (PEI) and chemical reduction in hydrazine hydrate. The water-soluble nanoclusters displayed the properties of strong fluorescence intensity and good stability. The PEI-Cu NCs showed maximum luminescence at 468 nm when excited at 375 nm. Based on the static quenching and inner filter effect mechanism, one sensitive and selective sensor for Que detection was established. The detection limit was 0.072 μM and two linear relationships existed in the range of 0.1–90 and 110–200 μM. Moreover, the PEI-Cu NCs probe was successfully employed to detect Que in real water samples. Graphic abstract In this work, rarely reported, polyethyleneimine-capped copper nanoclusters were applied in detecting quercetin with high sensitivity and excellent selectivity.
研究领域:
化学
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生物分析
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材料科学
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2022
·
IF 6.633
Shujin Zhou,Kai Sheng,Na Zhang,Shideng Yuan,Ning Feng,Yuxuan Song,Jiafeng Geng,Xia Xin
An emulsion system with reversible demulsification/emulsification transition triggered by light irradiation was achieved by azo-modified copper nanoclusters Cu 3 (azopz) 3 ( Cu3 , Hazopz = (3,5-dimethyl-4-(phenyldiazole)-1H-pyrazole)) in the surfactant (APG0810) oil-in-water emulsion. The phase separation behavior of the emulsion is attributed to the fibrous structures self-assembled from Cu3 in the toluene phase under 365 nm UV irradiation, which break the stability of the emulsion, resulting in the demulsification. Further visible light irradiation and homogenization could recover the emulsion. This process is completely reversible under alternating ultraviolet/visible light treatments. This study shows the first application of metal nanoclusters in controlling demulsification/emulsification by a noninvasive stimulus. Further development of sustainable chemical processes such as catalyst recycling, product separation and hydrogenation reaction is highly expected based on this research.
研究领域:
材料科学
·
化学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
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