ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Fei Li,Zhiguo Xia,Quanlin Liu
The ability to control dopants and defects, as well as the core/shell structures, of quantum dots (QDs) is an essential nanotechnology to modify and optimize their photoluminescence properties. Herein, the optimized ZnS:Mn2+/ZnS/ZnS:Cu2+/ZnS core/multishell QDs have been prepared, and their luminescence properties depending on the ratios of the starting materials and the injection temperature of an extra sulfur source were discussed; finally the white light can be possibly obtained by mixing the blue light (emission peak at 450 nm originating from Cu2+ dopants or emission peaks at 405 and 430 nm corresponding to a defect emission center) and orange light (emission peak at 585 nm from Mn2+ dopants). As a controlled synthesis comparison, the optimum core/shell structures and key synthesis parameters have been determined, and the quantum yield (QY) of the as-obtained ZnS:Mn2+/ZnS/ZnS:Cu2+/ZnS core/multishell white light emitting QDs without defect emission was determined to be 38%. The practical white light device prototype has been also fabricated and the CIE color coordinate of (0.32, 0.34) with a warm white light has been realized upon the excitation of the commercial 370 nm UV LED chip, which demonstrated potential application for micro/nano optical functional devices.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2022
·
IF 6.911
Kexin Wang,Xiaoting Xing,Yadan Ding,Xiaokun Wen,Yixuan Lu,Guorui Wang,Jiwei Wang,Huiying Zhao,Xia Hong
Luminescence-based methods are widely used for the detection of prostate specific antigen (PSA), for example during the diagnosis of prostate cancer. However, the accuracy of these methods is sub-optimal. The aim of this study was to develop an accurate and sensitive dual-mode immunosensing technique using a combination of resonance Raman scattering (RRS) and photoluminescence (PL) signals for the detection of PSA. A ZnS:Mn 2+ nanoprobe was used as the signal reporter, which exhibits both multi-phonon RRS and PL properties. The RRS signal intensity at 348 cm −1 and the PL signal intensity at 590 nm were used for the quantitative assay of PSA. The reproducibility, selectivity and specificity of this dual-mode immunosensing strategy demonstrated an improvement compared with commercial PSA ELISA kits in the analysis of serum samples. Therefore, the RRS-PL immunosensing technique developed in this study shows potential as a reliable technique to be used in the clinical diagnosis of prostate cancer.
研究领域:
生物医学工程
·
分析化学
·
肿瘤学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2012
·
IF 4.173
Min Yang,Aijuan Han,Junling Duan,Zhipeng Li,Yongchao Lai,Jinhua Zhan
In this study, an imprinted silica matrix of pentachlorophenol (PCP) co-loaded with Fe 3 O 4 nanoparticles and ZnS:Mn 2+ quantum dots (QDs) was fabricated. The introduction of Fe 3 O 4 nanoparticles to the imprinted matrix provided an easy way to separate PCP under an external magnetic field. ZnS:Mn 2+ QDs offered a readout signal to monitor the amount of PCP bound to the imprinted matrix and evaluate the efficiency of imprinting. X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy were used to characterize the imprinted matrix. The low angle X-ray diffraction and N 2 adsorption–desorption analysis indicated a periodic mesoporous structure. The as-synthesized imprinted matrix preferred to adsorb PCP rather than the other aromatic compounds like 2,4-dichlorophenoxy acetic acid, 2,4-dichlorophenol and phenol. The recoveries of spiked PCP in spring water and tap water with Fe 3 O 4 –ZnS:Mn 2+ co-loaded MIPs are 101% and 97%, respectively.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2017
·
IF 5.401
Cheng Zhang,Kui Zhang,Tingting Zhao,Bianhua Liu,Zhenyang Wang,Zhongping Zhang
Pesticides abuse has drawn considerable attention in agriculture, environment and food safety in recent years. How to selective and on-site detection of pesticide residues with rapid operation and low cost is still a hot topic. In this work, we report a novel method for the detection of pesticide thiram using phosphorescent Mn-doped ZnS quantum dots (ZnS:Mn 2+ QDs) combined by an affinity reaction between thiram and Ag + ions. On the one hand, the phosphorescence of as-prepared ZnS:Mn 2+ QDs at 590 nm can be effectively quenched by Ag + ions due to the direct cation-exchange reaction at the surface of QDs. On the other hand, the presence of thiram can inhibit phosphorescence quenching through the formation of stable Ag-thiram complex. This inhibition resulted in a linear recovery in emission intensity with increasing the amount of thiram, which enables thiram residues to be identified under the UV light illumination. In buffer condition, thiram could be detected within the concentration range of 50 nM–2.5 μM with a detection limit of 25 nM. Moreover, the proposed method has been successfully applied to thiram residues identification at fresh fruit peels. The investigation provides a profile for instant and visual detection of surface residues using doped quantum dots.
研究领域:
分析化学
·
环境科学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
ACS Biomaterials Science & Engineering
·
2025
·
IF 5.5
Naiyu Shi,Yanzhu Guo,Wenjuan Liu,Qian Chen,Jiangchuan Yang,Xiajie Hu,A. Yijia Mila Mohetaer,Bin Liu,Fuxiang Song
Although glass ionomer cement (GIC) is frequently adopted as the filling material for decayed teeth, it shows disadvantages like poor mechanical property and a low concentration on fluoride release, in which its clinical applications are limited. In this article, fluorinated graphene (FG) and ZnS:Mn2+ mechanoluminescence were dexterously adopted to GIC, thus successfully constructing the ternary composite glass ionomer cement material with high-strength anticaries to treat dental caries via filling. SEM, XRS, XRD, and FTIR were adopted to characterize the structural morphology and chemical composition of GFZ, comprehensively evaluating its mechanical properties, antibacterial features, and biocompatibility. Based on the experiment, the glass ionomer cement composite material (GF0.5Z1) mixed with 0.5 wt % FG and 1.0 wt % ZnS:Mn2+ presented the most significant improvement in the mechanical performance, in which the Vicker hardness, compressive strength, elastic modulus, and bending strength increased by 84.17% (89.28 ± 2.93 vs 48.46 ± 2.91 Hv), 70.90% (148.86 ± 7.50 vs 87.10 ± 0.95 MPa), 87.05% (4670.77 ± 592.42 vs 2497.07 ± 581.20 MPa), and 157.18% (26.67 ± 0.85 vs 10.37 ± 0.65 MPa), respectively, while the friction coefficient decreased by 15.38% (0.11). Moreover, based on the fluoride-releasing experiment, GF0.5Z1 released a higher concentration of fluoride (238.88 vs 69.69 ppm at the 7th day, 304.85 vs 74.79 ppm at the 14th day) than GIC at the same time node. Meanwhile, compared to GIC, GF0.5Z1 also showed advantageous antibacterial effects (90.24% ± 1.76, 94.35% ± 2.05), preferable cytocompatibility, and long-term stability. After the tooth filling in vitro, the occlusal high point can be displayed by orange visible light. Therefore, combining its outstanding mechanical properties, high fluoride ion-releasing level, enhanced antibacterial effect, and advantageous biocompatibility, GF0.5Z1 is a potential material for caries filling.
研究领域:
口腔材料学
·
纳米技术
·
生物材料
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Xiaowan Li,Ligang Chen
A new fluorescence probe constructed with a multifunctional nanocomposite, Fe3O4–ZnS:Mn2+/SiO2–NH2, was successfully synthesized and then used to detect folic acid in real serum samples. The nanocomposite was characterized by fluorescence spectroscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, X-ray powder diffraction, and physical property measurement system. With the addition of analyte, the Fe3O4–ZnS:Mn2+/SiO2–NH2 composite and folic acid formed a new complex because cross-linking of the amino and carboxyl groups participated in the condensation reaction. Then, the energy of quantum dots was transferred to the complex and led to quenching of the fluorescence. Moreover, the fluorescence intensity decreased significantly as the concentration of folic acid increased, and the fluorescence quenching ratio F0/F was related to the folic acid concentration in the range from 0.1 to 5 μg mL–1. This method was used for detecting folic acid in real serum samples and gave recoveries in the range of 89.0%–96.0%, with relative standard deviations of 1.2%–3.9%. The detection limit was 9.6 ng mL–1 (S/N = 3). These satisfactory and simple results showed the great potential of this fluorescence probe in the field of pharmaceutical analysis.
研究领域:
分析化学
·
纳米技术
·
药物分析
✓ 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）