JOURNAL OF ALLOYS AND COMPOUNDS
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2020
·
IF 4.65
Bingxin Xie,Lei Lei,Jinghua Xu,Shiqing Xu
An pH-sensitive citric acid coated Ce/Tb:KGd 2 F 7 nanocrystals with a broad detection range from 3 to 10 is established. Under the 254 nm excitation, the Tb 3+ emission intensity originated from Ce 3+ → Gd 3+ →Tb 3+ decreases gradually with the increase of pH, while its intensity almost keeps unchanged in pH 3 to 6 and increases in pH 6 to 10 under the 311 nm excitation, which activates the ratiometric pH sensing with high sensitivity.
研究领域:
材料科学
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纳米技术
·
传感器
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Miaomiao Chen,Meng Zhou,Yunyun Wang,Caihong Mao,Shujie Pang,Ting Meng,Xudong Yang
To address the challenges associated with the storage and application of traditional carbon dot (CDs) solutions, this study introduces a cyan fluorescent carbon dot-based hydrogel (CDs-SCH). The hydrogel was synthesized by integrating cyan fluorescent CDs, derived from penicillamine and m -phenylenediamine, with carboxymethylcellulose (CMC) and sodium alginate (SA), which was then mixed with acrylamide (AM). The resulting CDs-SCH hydrogel was extensively characterized, focusing on its morphology, chemical structure, and fluorescence behavior. The fluorescence intensity of the hydrogel was enhanced by 3.23 times compared to the original CDs. The fluorescence response of the CDs-SCH hydrogel to pH variations was examined, demonstrating its capability to visually monitor the freshness of aquatic products such as fish and shrimp. Furthermore, Al 3+ and Ag + ions were found to significantly modulate the fluorescence, with Al 3+ enhancing and Ag + quenching the fluorescence, displaying reliable detection limits and linearity. The hydrogel's ability to detect glutathione (GSH) via Ag + reduction to Ag was also explored. Additionally, the hydrogel exhibited stable Al 3+ adsorption, with the process following pseudo-second-order kinetics and the Langmuir adsorption model. As a versatile and responsive material, the CDs-SCH hydrogel holds potential for applications in intelligent food packaging and environmental ion detection.
研究领域:
材料科学
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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
ACS Nano
·
2021
·
IF 15.881
Jinglin Shen,Qianwen Xiao,Panpan Sun,Jin Feng,Xia Xin,You Yu,Wei Qi
The self-assembly of chiral metal nanoclusters into supramolecular chiral aggregates is of interest for developing advanced materials. Herein, we manipulated the self-assembly of Au nanoclusters modified by l-/d-cysteine (l-/d-AuNCs) into ordered microstructures featuring enhanced phosphorescence and optical activities. The formation of these aggregates was driven by synergistic effect of coordination and electrostatic interactions assisted by Cd2+/H+. Detailed structural characterization and theoretical studies confirmed that the compact aggregation structures are essential for the emission enhancement and the chirality amplification of l-/d-AuNCs. Interestingly, upon the formation of microflowers, the emission lifetime was prolonged to 3.34 ms with a switch from fluorescence to phosphorescence induced by aurophilic Au(I)···Au(I) interactions and intensive ligand-to-metal charge transfer (LMCT). Moreover, both the CD and photoluminescence (PL) signals of the microflowers exhibited pH-responsiveness. This dual-mode sensitive platform could be developed as a pH sensor with improved accuracy. Additionally, the pH-responsive photoluminescence ON/OFF switch of the microflowers could be employed for reliable information encryption and decryption. This study provides useful ideas for regulating the self-assembly of nanoclusters to generate desired photophysical properties with potential applications.
研究领域:
材料科学
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光学
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化学
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2015
·Vol. 7
·期 48
·20743-20748
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IF 7.394
Zhe Wang,Yuexiang Lu,Hang Yuan,Zhonghua Ren,Chao Xu,Jing Chen
Developing a simple synthesis method and expanding the application of carbon dots have attracted increasing attention. In this report, we have developed a facile method to synthesize fluorescent carbon dots (CDs) with the assistance of atmospheric-pressure microplasma. The CDs could be produced within a few minutes with no need of high temperature, external energy input, and multistep procedures. The as-prepared CDs had a relatively uniform size of approximately 2.3 nm. The FTIR spectrum and the XPS analysis showed that carbonyl groups and amide groups exist on the surface of CDs. The CDs showed bright blue luminescence and high stability in high salt concentration and low pH without further modification. A pH-dependent PL behavior was observed and could be applied for pH sensing in the range of 3–14. Moreover, the CDs could be utilized as a reagent capable of detecting U(VI) with a low detection limit and high selectivity.
研究领域:
材料科学
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分析化学
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DOI
高影响因子
RSC Advances
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2020
·Vol. 10
·期 61
·36971-36979
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IF 3.119
Hua Tian,Yongcheng Dai,Wenzhe Fu,Haifang Liu,Mengting Li,Meiyuan Lv,Xueqiong Yin
In this work, a multifunctional ratiometric fluorescence (FL) nanohybrid (CSCDs@DC) was synthesized from chitosan based carbon dots (CSCDs) and dansyl chloride (DC) at room temperature. The CSCDs@DC revealed strong FL intensity, great stability and excellent anti-photobleaching properties. Herein, CSCDs@DC was responsive to pH value in the range of 1.5–4.0 and exhibited color-switchable FL properties between acidic and alkaline environments. In addition, CSCDs@DC showed good selectivity and sensitivity towards Fe3+ ions. A good linear relationship for the Fe3+ ion detection was obtained in the range from 0 μM to 100 μM, with a detection limit of 1.23 μM. What's more, CSCDs@DC can be used as a fluorescent ink. It expressed superior optical properties after 3 months of storage or continuous exposure to UV light for 24 h. This study suggested that CSCDs@DC had potential in the detection of pH and metal ions, as well as showing promising application in the anti-counterfeiting field.
研究领域:
材料科学
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分析化学
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生物医学工程
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DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
·
IF 3.232
Yanan Zhang,Dajun Hou,Xueli Yu
A ratiometric fluorescent pH sensor was facilely constructed by covalent modification of amino-terminated silicon nanodots (SiND) with pH-sensitive fluorescein isothiocyanate (FITC). After optimization, the SiND-FITC(40:1) material with a SiND:FITC initial mass ratio of 40:1 was selected for the sensing of hydrogen ions. It was observed that the material inherits the unique features of SiND and FITC, and there is significant improvement of SiND acid−base stability, which is a favorable factor in terms of providing fluorescence reference signal. The SiND-FITC(40:1) material displays not only high pH sensitivity, but also good stability and anti-interference ability, and the response process is highly reversible. Deploying the SiND-FITC(40:1) material, we have made available a simple, sensitive, and precise approach for pH sensing. In aqueous solutions, the I 517 /I 466 fluorescence intensity ratio of SiND-FITC(40:1) increases linearly in the pH range of 5.40–7.76. This dual emission nanosensor was successfully applied for pH sensing and cellular fluorescence imaging.
研究领域:
纳米技术
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材料科学
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生物医学工程
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分析化学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
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2019
·Vol. 24
·期 16
·2923
·
IF 3.06
Piaopiao Chen,Iqra Ilyas,Su He,Yichen Xing,Zhigang Jin,Chaobiao Huang
Polymer dots (Pdots) represent newly developed semiconductor polymer nanoparticles and exhibit excellent characteristics as fluorescent probes. To improve the sensitivity and biocompatibility of Pdots ratiometric pH biosensors, we synthesized 3 types of water-soluble Pdots: Pdots-PF, Pdots-PP, and Pdots-PPF by different combinations of fluorescent dyes poly(9,9-dioctylfluorenyl-2,7-diyl) (PFO), poly[(9,9-dioctyl-fluorenyl-2,7-diyl)-co-(1,4-benzo-{2,1′,3}-thiadazole)] (PFBT), and fluorescein isothiocyanate (FITC). We found that Pdots-PPF exhibits optimal performance on pH sensing. PFO and FITC in Pdots-PPF produce pH-insensitive (λ = 439 nm) and pH-sensitive (λ = 517 nm) fluorescence respectively upon a single excitation at 380 nm wavelength, which enables Pdots-PPF ratiometric pH sensing ability. Förster resonance energy transfer (FRET) together with the use of PFBT amplify the FITC signal, which enables Pdots-PPF robust sensitivity to pH. The emission intensity ratio (I517/I439) of Pdots-PPF changes linearly as a function of pH within the range of pH 3.0 to 8.0. Pdots-PPF also possesses desirable reversibility and stability in pH measurement. More importantly, Pdots-PPF was successfully used for cell imaging in Hela cells, exhibiting effective cellular uptake and low cytotoxicity. Our study suggests the promising potential of Pdots-PPF as an in vivo biomarker.Keywords:Pdots;semiconductor polymer;FRET;pH sensing;cell imaging
研究领域:
生物化学
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材料科学
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2023
·
IF 3.7
Chunyu Yu,Xue Li,Xin Qiao,Zhiwei Zhang,Danyang Zhang,Hua Liu,Xue-Li Hao,Zhongzhi Wang,Hongpeng You,Liang Zhou
Fluorescent carbon quantum dots (r-CDs) were synthesized safely and readily by stirring at room temperature with a yield of 76.5%. The synthesized r-CDs exhibit bright green emission with an absolute quantum yield of 12.0% under the excitation of ultraviolet light. Within the pH range of 3–12, the r-CDs exhibit excellent fluorescence stability. Interestingly, the fluorescence intensity of r-CDs faded promptly when the pH value diminished to 2 and then regained when the pH value returned to 3. This means that r-CDs can be used as “on–off–on” fluorescent probes for pH sensing. The mechanism of this sensitive pH response behavior was discussed in detail, and a possible mechanism of protonation–deprotonation–protonation processes was proposed. In addition, we have proposed a green preparation route for eco-friendly filter paper using anticounterfeiting. Interestingly, the presence of Fe2+ significantly quenched the fluorescence of r-CDs. Experimental results demonstrated the r-CDs can also be used to detect the content of Fe2+ in water, and the detection limit was 8.82 μM/L.
研究领域:
化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Song Yuan,Yuanping Luo,Yuxiang Jiang,Wenjun Xu,Beijun Cheng,Zhili Peng
Green, economical preparation of carbon dots (CDs) from traditional Chinese herbal medicine Poria cocos via a one-step hydrothermal treatment was reported. The CDs exhibited excellent aqueous dispersibility , superior photoluminescence (PL) property and low cytotoxicity. Taking advantage of these properties, CDs were demonstrated as excellent multicolor bioimaging agents for the cellular imaging of MDA-MB-435S cells, with main distributions in the cell membranes and cytoplasm. Moreover, the CDs also exhibited good radical scavenging activity against 1,1-diphenyl-2-picrylhydrazyl (DPPH) thanks to their inheritance of characteristic functionalities from Poria cocos. Lastly, our study also shown that the PL of CDs was reversibly sensitive to pH in the range of 4.0 and 9.0, and a highly sensitive pH-sensing assay was developed exploiting this phenomenon. In summary, the study opened up new development paths for the modernization and vitalization of traditional Chinese medicine in biomedical research.
研究领域:
生物医学工程
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中药现代化
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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 Chemistry C
·
2019
·Vol. 7
·期 9
·2563-2569
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IF 6.641
Chao Xia,Mengmeng Cao,Jinfeng Xia,Guohong Zhou,Danyu Jiang,Dafeng Zhang,Jing Wang,Huili Li
Carbon dots (CDs), as a new kind of fluorescent pH nanoprobe, have attracted significant attention due to their favorable optical properties and excellent environmental friendliness. However, a real ratiometric and self-calibrating fluorescent pH nanoprobe based on intrinsic dual-emission CDs (DECDs) still remains scarce. In this study, we reported a kind of intrinsic DECDs for ratiometric fluorescence pH sensing. Interestingly, the two emission bands at 393 and 580 nm from the DECDs simultaneously display strong pH-dependence but with an adverse variation trend. The ratio of the intensity of 393 and 580 nm matches well with an empirical function against pH in the range from 2.2 to 8.0, and further, an excellent linear relationship is presented in an acidic environment with a responsive pH range of 2.2–4.0. Moreover, the rapid response time (<1 min), high sensitivity, good reversibility and pinpoint accuracy (±1.0%) for pH sensing reveals that the as-prepared DECDs can act as excellent ratiometric luminescent nanoprobes for pH detection. We hope that this study will offer new possibilities for expanding the applications of luminescent CDs in chemical sensing, biomedicine and food safety.
研究领域:
化学
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生物医学
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食品安全
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DOI
高影响因子
CHEMICAL PAPERS
·
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
ACS Applied Nano Materials
·
2019
·
IF 0
Lihua Shen,Chenxing Wang,Azhar Abbas,Chunxia Yu,Sichun Zhang,Xinrong Zhang,Chengxiao Zhang
Fluorescent carbon nanodots (CNDs) capable of dual emission blue and red light (B-R-CNDs) (460 and 610 nm) have been synthesized by a simple and low cost electrochemical method of discharging indole dissolved in ethanol in the presence of alkali. The presence of alkali played an important role to achieve switching from single blue emission to dual emission (red and blue). The as-synthesized CNDs have been thoroughly characterized by different spectroscopic techniques. Moreover, the origin of the red emission has been investigated by analyzing the intermediate product of CNDs using gas chromatography–mass spectrometry. It was found that 2-naphthaleneamine, an intermediate product of B-R-CNDs, achieves an extended π-conjugated system and heteroatom functional groups to B-R-CNDs, which are synergistically responsible for emission at longer wavelength. Moreover, the alkali-ethanol system played a pivotal role in structural transition from single emission to dual emission, because surface oxidation is caused by hydroxyl radicals produced in the alkaline system. Surface oxidation creates surface defects thereby giving rise to the surface-state-related red emission. The red emission of B-R-CNDs are found highly pH dependent which makes them a potential candidate for application in pH sensing. Moreover, as-prepared B-R-CNDs have been used in full color bioimaging of HepG2 cells and exhibit an accurate mitochondrial-targeting ability.
研究领域:
材料科学
·
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
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