CHINESE JOURNAL OF POLYMER SCIENCE
·
2025
·
IF 4
Zhou Xiao-Xia,Yin Yi-Ting,Zhang Xiao-Yi,Li Shu-Sheng,Jiang Xu-Bao,Zhu Xiao-Li,Kong Xiang-Zheng
Fluorescent polyurea-carbon dots (PU-CD) were successfully achieved through a co-pyrolysis technique, combining polyurea (PU) with carboxyl-containing carbon dots (PCD) at a temperature of 220 °C. The PU was fabricated via a simple precipitation polymerization process using toluene diisocyanate in a water/acetone binary solvent system. PCD was generated by thermal treatment of poly(ethylene glycol) (PEG) at the same elevated temperature. To elucidate the structural characteristics of PU-CD, as well as its precursor components PU and PCD, a comprehensive suite of analytical techniques was employed, including transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (NMR), dynamic light scattering (DLS) and X-ray photoelectron spectroscopy (XPS). These analyses confirmed the formation of amide bonds resulting from the reaction between the terminal amines of PU and the carboxyl groups of PCD. An in-depth comparison of the fluorescence properties of PU-CD revealed marked enhancements in fluorescence intensity when contrasted with PU, PEG, and the individual PCD. The research explored the impact of various factors such as concentration, pH in aqueous solutions, and solvent type on the fluorescence emission of these materials, providing valuable insights into their emission mechanisms. It was particularly noteworthy that both PCD and PU-CD exhibited a confined-domain crosslink-enhanced emission effect. Utilizing the aqueous dispersion of PU-CD as a fluorescent probe, the detection of doxycycline (DOX), a long-acting, broad-spectrum, semi-synthetic tetracycline antibiotic, was achieved with a detection limit of 2.9×10 −7 mol/L. This study introduces a simple, green, and cost-effective fluorescent probe for the detection of DOX, which has significant potential for application in the realms of analytical chemistry and food safety monitoring in the future.
研究领域:
分析化学
·
材料科学
·
纳米技术
·
传感器
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Mingye Ding,Chunhua Lu,Le Chen,Zhenguo Ji
Traditional FIR (fluorescence intensity ratio)-based optical thermometers, requiring narrow energy gap between two thermally coupled states (TCS) of single rare-earth ion, have inherent drawbacks including low signal discriminability and large measuring error. To overcome the intrinsic limitation, a new thermometry strategy involving the usage of dual-emitting activators with diverse temperature-dependent emission behaviours has been proposed. Impressively, β-NaYF 4 :Ce 3+ /Tb 3+ phosphor exhibits good temperature sensing performance, excellent signal discriminability and superior thermal stability by using the linearly temperature-dependent FIR between Ce 3+ and Tb 3+ as detecting parameter. Hopefully, the developed dual-emitting sample could have a promising application in self-calibrated luminescent thermometry and this strategy provides a reference for developing high-performance optical thermometers.
研究领域:
材料科学
·
光学工程
·
无机化学
·
生物医学工程
·
纳米技术
·
传感器
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 13
·7723-7731
·
IF 3.361
Ruohu Zhang,Zhanrui Jin,Zhengqiu Tian,Yingzhou Liu,Zhengqi Lu,Yiping Cui
A straightforward immunoassay based on silicon-assisted surface enhanced fluorescence (SEF) has been demonstrated using a silicon-based fluorescent immune substrate and silver-antibody nanoconjugate (SANC). The P-doped, (100) oriented silicon wafers are used for both fluorophore attachment and antigen immobilization. The silicon substrate offers a very low blank signal in the “OFF” state, due to its fluorescence quenching effect. In the detection process, the capture of the SANCs by the surface-immobilized antigen leads to an effectively enhanced fluorescence to produce an “ON” state. The analytical performance of the presented scheme has been investigated and a limit of detection of 31.4 pg mL−1 has been obtained. Besides the broadened application range compared with the conventional immunoassays, the presented scheme is straightforward, cost effective and sensitive, and is hence expected to find widespread applications in immunoassays as well as other fluorescence-based assays.
研究领域:
分析化学
·
生物传感器
·
纳米技术
·
免疫测定
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2015
·
IF 2.358
Meng Li,Xihuai Qiang,Wei Xu,Hui Zhang
A novel anionic AFC-based waterborne polyurethane was synthesized by importing the fluorescent agent 7-amino-4-(trifluoromethyl)coumarin (AFC) into the polyurethane chains. Structure of the WPU-AFC was confirmed by Fourier transform infrared spectroscopy (FTIR) and UV–visible absorption spectroscopy. Number average molecular weight and average emulsion particle size for WPU-AFC were also determined. It was found that the fluorescence intensity of WPU-AFC decreased with the increasing temperature and was enhanced compared with that of AFC. The improved thermal stability of WPU-AFC could be attributed to the incorporation of benzopyrone units in the preformed urethane groups. Furthermore, the fluorescence of WPU-AFC emulsion was very stable for long-term storage and it was a promising agent utilized in the specific collagen fiber materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ECS Journal of Solid State Science and Technology
·
2024
·Vol. 13
·期 5
·057004
·
IF 1.8
Yu Ding,Yaru Li,Soufian Chakir,Jun Mei,Xianbiao Wang
Phosphate pollution leads to deterioration in water quality, posing a serious threat to human health. Therefore, it is important to develop a highly selective and sensitive fluorescent probe for phosphate detection. Here, we report a novel ratiometric fluorescent probe, Fluorescein@NH2-UiO-66 (denoted as Flu@NH2-UiO-66), for the trace detection of phosphate in water. Specifically, during the in situ solvothermal synthesis of Flu@NH2-UiO-66, fluorescein molecules were encapsulated into the cavities of the metal-organic framework. Furthermore, the encapsulation amount of fluorescein was controlled by adjusting the acidity of the system. The Flu@NH2-UiO-66 (60 H+) sample, prepared with a 60:1 molar ratio of acetic acid to the metal center exhibited distinct dual fluorescence signal peaks. The probe showed a highly selective fluorescence response to phosphate. Within a range of 0–20 μM phosphate concentration, the probe demonstrated excellent linear detection capability with a detection limit of 0.37 μM. Moreover, the mechanism of fluorescence enhancement can be attributed to the addition of phosphate, which greatly increases the UV absorbance of the probe. This study developed a novel ratiometric fluorescent probe capable of rapid, sensitive, and stable detection of trace phosphate, which is of great significance for environmental management.
研究领域:
环境科学
·
分析化学
✓ 已验证
DOI
高影响因子
Small
·
2024
·Vol. 20
·期 29
·2310563
·
IF 13
Pengfei Li,Shanshan Xue,Lu Sun,Xiaobao Ma,Wenning Liu,Li An,Yichang Liu,Dan Qu,Zaicheng Sun
Carbon dots (CDs) have received considerable attention in many application areas owing to their unique optical properties and potential applications; however, the fluorescent mechanism is an obstacle to their applications. Herein, three-color emissive CDs are prepared from single o -phenylenediamine (oPD) by regulating the ratio of ethanol and dimethylformamide (DMF). Fluorescent mechanism of these CDs is proposed as molecular state fluorescence. Reaction intermediates are identified using liquid chromatrography–mass spectroscopy (LC–MS) and 1 H nuclear magnetic resonance (NMR) spectra. 1H-Benzo[d]imidazole (BI), 2,3-diaminophenazine (DAP), and 5,14-dihydroquinoxalino[2,3-b] phenazine (DHQP) are proposed to be the fluorophores of blue, green, and red emissive CDs by comparing their optical properties. As per the LC–MS and 1 H-NMR analysis, DHQP with red emission tends to form from DAP and oPD in pure ethanol. By adding DMF, BI formation is enhanced and DHQP formation is suppressed. The prepared CDs exhibit green emission with DAP. When the DMF amount is >50%, BI formation is considerably promoted, resulting in DAP formation being suppressed. BI with blue emission then turns into the fluorophore of CDs. This result provides us an improved understanding of the fluorescent mechanism of oPD-based CDs, which guides us in designing the structure and optical properties of CDs.
研究领域:
材料科学
·
光学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yijun Yao,Jiannan Xue,Miao Wang,Dong Fu,Yanqin Shen,Ying Xue,Fan Zhang,Pengbi Liu,Hongru Wang,Hailiang Wu
Herein, a facile, green, and universal method to prepare polymer fluorescent films was proposed. Firstly, hollow cellulose-based microspheres were prepared by cross-linking copolymerization and self-assembly strategy. Then, after encapsulating the hydrophobic fluorescent dye fluorescein isothiocyanate (FITC) into the cavity of a hollow cellulose-based microsphere through the ultrasonic/dialysis method, a series of flexible fluorescent microsphere films with tunable fluorescence was obtained. The formation of hollow cellulose-based microspheres was confirmed by SEM. DLS, AFM, and UV–vis analysis provided evidences for the successful encapsulation of FITC in hollow cellulose-based microspheres. Benefiting from the synergistic effects of “anchoring”, “diluting” and “isolation” for cellulose polymer chain as well as the hollow structure, the aggregation and self-quenching of FITC were effectively inhibited, which promoted the fluorescent films with different loading amount to emit green fluorescence under 365 nm UV light irradiation, and the fluorescence intensity was tunable. Moreover, the fluorescent films exhibited strong UV absorption, excellent optical stability, foldability, and easy scrollability. Particularly, compared with the luminescent film constructed by whisker-like cellulose-based microgel, the hollow cellulose-based fluorescent microsphere film obtained in this work had higher solvent resistance, water contact angle, and thermal stability. Due to the high stability and easy processability of hollow cellulose-based fluorescent microspheres, they could be processed into coating materials and fibers that were durable and widely used. They have potential application value in the fields of light-emitting devices, safety warnings, smart labels, and anti-counterfeiting materials, etc.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 17
·175604
·
IF 3.874
Fan Liu,Yuan Jiang,HaiBao Shao,Chunlei Wang,Shuhong Xu,Rong Zhang
Precise control of the structure and bonds of doped carbon dots (CDs) is important, so that their fluorescence can be tuned as desired. Up until now, there has been a lack of effective ways to control the bonds of doped CDs. In this article, we show that the fluorescence of B/N-doped carbon dots (B/N-CDs) can be precisely tuned just by controlling their precursors' pH values. The prepared B/N-CDs exhibit two emission bands, including one emission peak at around 450 nm due to the defect state caused by low sp2 hybridization of carbon atoms, as well as another emission peak at around 360 nm caused by the B-N bond. The results for the ratio of the maximum intensity of the two emission peaks above show a linear relationship. Meanwhile, the role of the pH value of the precursors on the luminescence of B/N-CDs is deeply studied. On the one hand, the pH value affects the bonding process of CDs. N-H bonds tend to form at a low pH value, while more competitive B-N bonds exist at much higher pH value, leading to the pH-dependent intensity of the 360 nm emission band. On the other hand, a high pH value causes higher crystallinity, thus suppressing defect-state fluorescence at 450 nm. The dual effects of pH lead to precisely controlled dual-emission intensities as well as ratiometric fluorescence.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANICA CHIMICA ACTA
·
2022
·
IF 3.118
Yuwei Dong,Jialin Ma,Zhou Yu,Xinxin Liu,Zhen Zhao
Herein, we report a reversible and easy assembled fluorometric probe (4-(quinolin-2-ylmethylene)aminoanisole, QMAA ) for the highly selective and sensitive detection of cadmium ion (Cd 2+ ) in DMF solution with PBS buffer (0.01 M, pH = 7.30). The strong fluorescence response of QMAA to Cd 2+ along with a bright blue fluorescence was mainly ascribed to the formation of the complex QMAA–CdCl 2 . The results show that the complexation can inhibit the C N isomerisation and photo–induced electron transfer (PET), and further lead to the occurrence of chelation fluorescence enhancement. The 1:1 stoichiometry of the complex between QMAA and cadmium ion was studied by fluorescence titration, Job’s plot analysis, 1 H NMR, FT–IR, and ESI–MS data, and was further confirmed by the single crystal structure of the complex QMAA–CdCl 2 . Density functional theory (DFT) calculations have verified the mechanism of fluorescence enhancement. In addition, the limit of detection of QMAA for Cd 2+ was as low as 0.1547 µM (at 10 –7 M level), which was lower than the acceptable limit of Cd 2+ level in drinking water defined by World Health Organization. The analog experiments about nature contamination of Cd 2+ in real samples were finished.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 15
·9342-9350
·
IF 4.036
Yuyi Zhang,Wei Zhang,Yajie Bian,Yiting Liu,Xiaolei Zhang,Mengdi Chen,Bingwen Hu,Qingyuan Jin
Zeolitic imidazolate framework-8 (ZIF-8) is one of the most promising metal–organic frameworks because of its excellent high porosity, stability and geometrically well-defined structure. However, the application of ZIF-8 in the field of fluorescent molecular sensing has not been intensively explored. Our work demonstrates the versatility of ZIF-8 as a carrier material, which can be used for small molecule [2-(2-hydroxyphenyl)-1H-benzimidazole (HPBI)] capture and fluorescence enhancement. ZIF-8 displays luminescent behavior changes when combined with HPBI, as the emission peaks of ZIF-8 and HPBI are located in the same range for resonance enhancement of fluorescence. The results of the experiment indicate that the fluorescence enhancement effect will change in the presence of different concentrations of HPBI. We propose that the pore structure of ZIF-8 could provide an opportunity for the adsorption of HPBI molecules, and eventually the adsorption would saturate. The high porosity of ZIF-8 provides the path to HPBI aggregation or entrance into the ZIF-8 internal structure. Our results suggest that ZIF-8 may offer great promise for molecular fluorescence sensing.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Xin Liu,Wei Yu,Xiaowei Mu,Wei Zhang,Xinghua Wang,Qiang Gu
A rapid and sensitive strategy for sensing dopamine (DA) was proposed based on the fluorescence quenching effects of polydopamine (PDA) on carbon dots (CDs). The green-emission fluorescence CDs were synthesized via a facile one-pot hydrothermal approach by employing p-phenylenediamine and ethanol as reagents. In alkaline environments, DA would polymerize to form PDA on surface of CDs, resulting in the fluorescence quenching of the detection system owing to the effects of fluorescence resonance energy transfer (FERT) and inner filter effect (IFE). The proposed fluorescence probe exhibits good selectivity and sensitivity to DA in the concentration range of 0.1–15 μM, with a limit of detection (LOD) of 37 nM. Results of detecting DA in serum samples indicate the broad potential of the proposed strategy for future application in diagnosis of DA-related diseases.
研究领域:
分析化学
·
医学诊断
·
生物传感
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Xin Li,Liuxi Zhao,Yuhan Wu,Ao Zhou,Xuanfeng Jiang,Yuan Zhan,Zhengguang Sun
Carbon dots have been widely focused on the field of metal ion detection due to their excellent optical property. Herein, novel orange fluorescent nitrogen and boron co-doped carbon dots (NB-CDs) are obtained by one-pot solvothermal using p-phenylenediamine and boric acid as raw materials. The NB-CDs exhibit excitation-independent emissions and the maximum emission wavelength is 597 nm at 420 nm excitation. The fluorescence can be quenched by Ce 4+ effectively and selectively, and the detection range of Ce 4+ is gained from 0.14 to 180 μM with a detection limit of as low as 0.14 μM. Furthermore, Al 3+ can also recombine with NB-CDs surface functional groups, which shows a detection range from 1.07 to 100 μM and a detection limit of as low as 1.07 μM, accompanied with a blue-shift to 527 nm.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）