JOURNAL OF LUMINESCENCE
·
2019
·
IF 2.961
Yue Zhao,Tong Song,Katarzyna Matras-Postolek,Ping Yang
Highly luminescent CdTe quantum dots (QDs) is a typical luminescent material with great application potential. The photoluminescence (PL) and stability of the QDs depended strongly on Cd precursors, ligand (e.g. thioglycolic acid TGA) and preparation conditions. In this paper, CdTe QDs were prepared using Cd precursors with various molar ratios of TGA/Cd at different conditions. The composition of Cd-precursors depend strongly on the molar ratios of TGA/Cd and storage time due to the formation of Cd-TGA clusters which affects strongly the surface states of the QDs. The effect of the preparation conditions of Cd-precursors (e.g. molar ratios of TGA/Cd) on the PL peak wavelength, the full width at half maximum of PL spectra, PL quantum yields (PLQYs), fluorescence lifetime , and stability were tested in detailed. Interestingly, the PLQYs of the QDs prepared using a large molar ratio of TGA/Cd remarkably increased after Cd precursor stored in dark conditions for long time. This confirms that Cd-TGA clusters in the precursors drastically affected the synthesis of the QDs. The mechanism was discussed in detailed. These aqueous CdTe QDs with high PLQYs were obtained using a molar ratio of TGA/Cd of 1.25. In addition, the PL peak position of the QDs was red-shifted with increasing temperature, but is back to the initial value after cooling down to room temperature . Cycle test indicates red-emitting QDs reveal high stability.
研究领域:
材料科学
·
光学
·
纳米技术
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DOI
高影响因子
NANO
·
2018
·
IF 1.1
Bo Hu,Yang Lu,Keyu Cui,Yongsheng Yan
In this study, a novel imprinted polymer based on 3-aminophenylboronic acid (APBA)-functionalized CdTe quantum dots (QDs) was synthesized and used to sensitively and selectively detect glucose. In the process of synthesis, the boronic acid in the APBA could combine covalently with vicinal diol compounds, directing imprinting process, and the APBA-modified CdTe QDs were used as the solid supports. By this method, the prepared molecular imprinting polymers (MIPs)-APBA/CdTe QDs show high selectivity, high sensitivity and good stability. Under optimal conditions, a linear relationship was obtained covering the linear range of 0–1.5 mmol/L with a correlation coefficient of 0.99833 and a high imprinting factor about 5.71. Furthermore, the prepared MIPs-APBA/CdTe QDs were successfully applied to detect glucose in human serum samples. This work provides a new way to synthesize an excellent stability and efficient imprinted polymer based on CdTe QDs for convenient, fast and highly selective detection of glucose.
研究领域:
生物化学
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分析化学
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纳米医学
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产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Huiling Li,Li Tian,Shuning Yang,Chao Li,Ruidan Li,Yujia Song,Yanjia Guo,Xuwen Li
In this paper, CdTe quantum dots with near-infrared fluorescence (NIR) and hexagonal prism-shaped ZnO were synthesized, and the composites were characterized for their performance. A sensitive molecularly imprinted electrochemiluminescence (ECL) sensor for the determination of mevastatin was constructed based on ZnO@CdTe and molecularly imprinted polymer (MIP). The highest ECL intensity of the system was obtained by ZnO@CdTe as the main luminophores reacted with the co-reactant K 2 S 2 O 8 . The ECL response generated by the reaction of ZnO@CdTe and K 2 S 2 O 8 was used as the basic signal detection platform. The MIP was prepared by the electropolymerization process on the above platform, which laid the foundation for forming the mevastatin cavities with specific recognition sites. In addition, the response mechanism was investigated, and the determination conditions were optimized. The ECL intensity change values (ΔI) of the sensor showed a good linear relationship with the logarithm of mevastatin concentration in the range of 2.0 × 10 −11 to 2.0 × 10 −6 mol L −1 , and the limit of detection was 6.7 × 10 −12 mol L −1 (S/N = 3). This method obtained satisfactory results in the detection of mevastatin in tablets.
研究领域:
分析化学
·
药物分析
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生物传感技术
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产品关联
DOI
高影响因子
LUMINESCENCE
·
2021
·Vol. 36
·期 6
·1525-1530
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IF 2.464
Yi Pan,Zheng Fang,Hanjiao Chen,Zhou Long,Xiandeng Hou
A simple method was developed in this work for facile and visual detection of S 2− using a paper-based fluorescence (FL) sensor coated with CdTe quantum dots (QDs) by headspace sampling. With the addition of hydrochloric acid, the target S 2− in the liquid phase would transform to H 2 S, which was released to headspace and quenched the FL of CdTe QDs in a linear manner through a gas–solid reaction, with any possible liquid-phase interference avoided. The regular quenching caused by S 2− in analyte solution with increased concentration could be easily observed by the naked eye, and the limit of detection (LOD) for this method was 0.13 μM and 0.93 μM for FL and visual sensing, respectively, comparable or not to that by other sensing probes. A relative standard deviation of 1.2% was accomplished from seven replicated measurements, implying the high reproducibility, and the recovery for the spiked water samples ranging from 94 to 103%, and illustrating the satisfactory reliability of this method. Moreover, the preparation of this paper sensor was facile and did not require any complicated or time-consuming procedures for additional modification or functionalization as for other probes previously reported.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
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2024
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IF 7.2
Zhe Wang,Chunchun Zhang,Shanling Wang,Meng Zhang,Xiaoqin Chen,Chaoran Luan,Kui Yu
Colloidal semiconductor magic-size clusters (MSCs) remain poorly understood with regard to their formation and transformation. We show that ZnTe MSC-324 (with an optical absorption peak at 324 nm) and MSC-398 evolve in reactions of Zn and Te precursors, while CdTe MSC-371 and MSC-481 develop in reactions of Cd and Te precursors. We propose that MSCs evolve from their precursor compounds (PCs). Chemical self-assembly results in the formation of ZnTe PC-324 and CdTe PC-371, which, respectively, transform to ZnTe PC-398 and CdTe PC-481 via monomer addition. When the ZnTe MSCs are mixed with Cd(OAc)2/OLA (cadmium acetate in oleylamine), the CdTe MSCs also evolve. We further hypothesize that cation exchange occurs on the ZnTe PCs, resulting in CdTe PCs that transform to their counterpart CdTe MSCs. Moreover, ZnTe PC/MSC-324 and CdTe PC/MSC-371 have similar Zn/Cd-to-Te stoichiometries, as do ZnTe PC/MSC-398 and CdTe PC/MSC-481. Accordingly, the Te precursor quantitatively dictates the coassembly of Zn or Cd and Te precursors as well as the monomer addition. The present findings advance the understanding of the initial PC formation, PC-to-PC transformation, PC-to-MSC isomerization, and PC-to-monomer fragmentation.
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
JOURNAL OF MATERIALS CHEMISTRY
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2011
·Vol. 21
·期 18
·6569-6575
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IF 5.101
Xintao Luo,Jishu Han,Yang Ning,Zhe Lin,Hao Zhang,Bai Yang
1-Thioglycerol (TG)-stabilized quantum dots (QDs) are good candidate for performing a stepwise polymerization reaction with polyurethane (PU) prepolymers, but their use is limited by their worse photoluminescence (PL) in comparison to QDs stabilized by other mercapto-ligands. To overcome this problem, TG-stabilized CdTe QDs with enhanced PL were synthesized in water through a N2H4-promoted growth approach. The current synthesis significantly shortened the duration of the size evolution of QDs, particularly for obtaining samples with orange and red emissions. It also permitted QD growth at low temperatures, such as room temperature, which avoided the decomposition of TG and subsequent embedment of sulfur into the QDs as occurs in the conventional synthesis. Most importantly, the TG ligand endowed the QDs with hydroxyl coverage, making the QDs miscible with PU prepolymers in dimethyl sulfoxide, and therefore overcoming the main problem in fabricating PU-based nanocomposites of eliminating water. The hydroxyl coverage further allowed for the linkage of PU on the surface of the QDs through the reaction between –OH and –NCO, producing CdTe QD–PU bulk nanocomposites. Systematic characterization indicated that the QDs were well dispersed in the PU medium, and the size-dependent PL of QDs was also maintained.
研究领域:
材料科学
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纳米科技
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高分子化学
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光电子学
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胶体与界面化学
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DOI
高影响因子
LUMINESCENCE
·
2015
·Vol. 31
·期 1
·241-246
·
IF 1.518
Qiong Yang,Xuanping Tan,Jidong Yang
A sensitive and simple method for the determination of enoxacin (ENX) was developed based on the fluorescence quenching effect of ENX for glutathione (GSH)-capped CdTe quantum dots (QDs). Under optimum conditions, a good linear relationship was obtained from 4.333 × 10 −9 mol⋅L −1 to 1.4 × 10 −5 mol⋅L −1 with a correlation coefficient (R) of 0.9987, and the detection limit (3σ/K) was 1.313 × 10 −9 mol⋅L −1 . The corresponding mechanism has been proposed on the basis of electron transfer supported by ultraviolet–visible (UV) light absorption, fluorescence spectroscopy, and the measurement of fluorescence lifetime. The method has been applied to the determination of ENX in pharmaceutical formulations (enoxacin gluconate injections and commercial tablets) with satisfactory results. The proposed method manifested several advantages such as high sensitivity, short analysis time, low cost and ease of operation. Copyright © 2015 John Wiley & Sons, Ltd.
研究领域:
分析化学
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药学
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Dongting Yue,Xufang Qian,Miao Kan,Meng Ren,Yao Zhu,Lele Jiang,Yixin Zhao
Binary transition metals layered double hydroxides (LDH) such as [NiFe] have been developed as the promising low cost and high performance electrocatalysts for hydrogen evolution. However their applications as co-catalysts in photocatalysis like CdTe/CdS quantum dots (QDs) for hydrogen evolution are limited by their ineffective contact with QDs nanoparticles. We report on the synthesis of the sulfurated [NiFe]-LDH (FeNiS) nanoparticles via the sulfurizing treatment of [NiFe]-based LDH. The sulfurizing treatment can successfully break the 2D [NiFe]-LDH into FeNiS nanoparticles by replacing the OH group via the S group. FeNiS nanoparticles provide more bonding sites for CdTe/CdS QDs due to the sulfur species formed on the FeNiS nanoparticles. The junction between sulfur species and Cd 2+ of CdTe/CdS QDs could facilitate electrons transfer between CdTe/CdS QDs and FeNiS nanoparticles and then significantly enhance their photocatalytic hydrogen production. The photocatalytic activity of FeNiS-CdTe/CdS is much better than [NiFe]-CdTe/CdS QDs and Pt-CdTe/CdS QDs. In all, this novel FeNiS nanoparticles would be a promising low cost co-catalyst for energy and environmental photocatalysis.
研究领域:
材料科学
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能源化学
·
环境科学
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产品关联
DOI
高影响因子
Journal of Analytical Methods in Chemistry
·
2019
·
IF 1.589
Zhihong Wang,Ruiqing Long,Mijun Peng,Te Li,Shuyun Shi
Ferulic acid (FA), an important phenolic acid, is widely distributed in higher plants and presents many pharmacological effects. Therefore, sensitive determination of FA in complex matrix is necessary. Molecularly imprinted polymers-coated CdTe quantum dots (CdTe-QDs@MIPs) exhibited incomparable advantages because of their combination of excellent selectivity of MIPs and high sensitivity of QDs. Here, a fluorescent probe based on CdTe-QDs@MIPs was successfully fabricated for selective and sensitive determination of FA. MIPs shell was obtained by the reverse microemulsion method using FA, 3-(aminopropyl) triethoxysilane (APTES), and tetraethyl orthosilicate (TEOS), as template, functional monomer, and crosslinker. In optimal conditions, the fluorescence CdTe-QDs@MIPs sensor exhibited fast response (within only 3 min), high sensitivity (limit of detection, LOD at 0.85 μg/l), excellent linear ranges (2–100 μg/l) with a correlation coefficient of 0.9996, and distinguished selectivity for FA. Satisfactory recoveries from 91.8% to 110.3% were achieved with precisions below 6.6% for FA analysis in real pineapple juice and apple juice by developed CdTe-QDs@MIPs. The fluorescence results coincided well with those obtained by high-performance liquid chromatography (HPLC). It could be concluded that the resultant CdTe-QDs@MIPs offered a new way for rapid and sensitive analysis of FA in the complex matrix.
研究领域:
分析化学
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材料科学
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药物分析
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产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2018
·Vol. 25
·期 12
·7017-7029
·
IF 3.809
Guan Qingshun,Song Ruyuan,Wu Weibing,Zhang Lei,Jing Yi,Dai Hongqi,Fang Guigan
Abstract With water-soluble CdTe quantum Dots (QDs) as fluorescent labels and TEMPO-oxidized cellulose nanofibrils (CNF) as matrix, dual-color QD-encoded microspheres were prepared by mechanical spraying, freeze-molding and subsequent electrostatic cross-linking by calcium ion. The entire preparation process was accomplished in aqueous phase without any chemical treatment. The nanocellulose microspheres possessed porous structure and were able to be dispersed stably in water in the form of hydrogels. CdTe QDs were efficiently fixed in the network of intertwined nanofibrils via hydrogen bonding with CNF, making the microspheres to obtain high photoluminescence (PL) intensity and identifiable encoding signals consisting of seven kinds of microsphere arrays. The crystalline structure and chemical composition of both CdTe QDs and CNF were not affected during the preparation process. The comparision of PL behaviors of CdTe QDs and QD-encoded microspheres in different media indicate that CNF matrix provided good protection of QDs and improved the PL intensity and photostability. Graphical Abstract Dual-color CdTe-encoded nanocellulose microspheres were prepared via pure physical process in aqueous phase. The fluorescent microspheres possessed high photoluminescence intensity and identifiable seven kinds of encoding signals. The nanocellulose matrix provided good protection of CdTe QDs and improved the photoluminescence intensity and photostability.
研究领域:
材料科学
·
纳米技术
·
化学
·
生物技术
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产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2015
·Vol. 40
·期 1
·458-463
·
IF 3.086
Huimin Duan,Leilei Li,Xiaojiao Wang,Yanhui Wang,Jianbo Li,Chuannan Luo
A trace-level chemiluminescent (CL) sensor for the determination of phenacetin, utilising CdTe quantum dots@luminol (QDs@luminol) for signal amplification, based on a chitosan/magnetic graphene oxide-molecularly imprinted polymer (CsMG-MIP) as a biological recognition material was fabricated. CdTe QDs@luminol, which was used in the preparation process for the sensor, could amplify the signal of the CL sensor through chemiluminescence resonance energy transfer (CRET) while reducing the consumption of luminol. The CsMG-MIP, taking full advantage of the abundant hydroxyl and amino groups in chitosan which provide a lot of sites for the formation of hydrogen bonds in SMIP, using graphene oxide to improve the adsorption capacity and Fe3O4 nanoparticles to make the preparation of the recognition unit simple and easy, was introduced into the CL sensor. Under the optimized conditions of the CL sensor, phenacetin could be assayed in the range of 3.0 × 10−9–3.0 × 10−7 mol L−1 with a detection limit of 8.2 × 10−10 mol L−1 (3δ). With the advantages of amplifying the CL signal through CRET and reducing the consumption of luminol simultaneously, the sensor was successfully applied to the determination of trace-level phenacetin in real samples with a high selectivity and with the reagent economized.
研究领域:
分析化学
·
生物传感
·
药物分析
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Yuting Wang,Fengming Zhang,Jia Liu,Bin Yang,Yue Yuan,Yanyan Zhou,Shuyun Bi
A method was established for detecting the content of nitrofurazone (NFZ) by fluorescence quenching of N-Acetyl-L-Cysteine (NAC) coated cadmium telluride quantum dots (CdTe QDs). By means of transmission electron microscopy (TEM) and multispectral methods such as fluorescence and ultraviolet visible spectra (UV–vis), the synthesized CdTe QDs were characterized. The quantum yield ( φ ) of CdTe QDs was measured as 0.33 by reference method. The CdTe QDs had a better stability, the RSD of fluorescence intensity was 1.51% in three months. NFZ quenching the emission light of CdTe QDs was observed. The analyses of Stern-Volmer and time-resolved fluorescence suggested the quenching was static. The binding constants ( K a ) between NFZ and CdTe QDs were 1.14 × 10 4 (293 K), 0.74 × 10 4 (303 K) and 0.51 × 10 4 (313 K) L mol −1 . The hydrogen bond or van der Waals force was the dominated binding force between NFZ and CdTe QDs. The interaction was further characterized by UV–vis absorption as well as Fourier transform infrared spectra (FT-IR). Using fluorescence quenching effect, a quantitative determination of NFZ was carried out. The optimal experimental conditions were studied and determined as following: pH was 7 and contact time was 10 min. The effects of reagent addition sequence, temperature and the foreign substances including some metals (Mg 2+ ; Zn 2+ ; Ca 2+ ; K + ; Cu 2+ ), glucose, bovine serum albumin (BSA) and furazolidone on the determination were studied. There was a high correlation between the concentration of NFZ (0.40 – 39.63 μg mL −1 ) and F 0 / F with the standard curve F 0 / F = 0.0262 c + 0.9910 ( r = 0.9994). The detection limit (LOD) reached 0.04 μg mL −1 (3 S 0 / S ). The contents of NFZ in beef and bacteriostatic liquid were detected. The recovery of NFZ was 95.13% – 103.03% and RSD was 0.66% – 1.37% ( n = 5).
研究领域:
分析化学
·
生物医学工程
✓ 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）