JOURNAL OF LUMINESCENCE
·
2012
·
IF 2.102
Zhengqing Liu,Pengfei Yin,Huiping Gong,Pingping Li,Xiaodan Wang,Youqiu He
Aqueous glutathione (GSH)-capped CdTe / ZnS QDs with the diameter of 3–4 nm were synthesized. The fluorescence of CdTe / ZnS QDs at 577 nm was quenched in the presence of rifampicin (Rfp), with excitation wavelength at 350 nm. The mechanism of the interaction of CdTe / ZnS QDs with Rfp was investigated. Under the optimal conditions, the calibration plot of ln( F 0 /F ) was linear in the range 0.83–56 μg mL −1 with concentration of Rfp, and the detection limit was 0.25 μg mL −1 . The proposed method was successfully applied to the determination of Rfp in its commercial capsules, and satisfactory results were obtained. The recovery of the method was in the range 98.6–103.2%.
研究领域:
分析化学
·
药学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2019
·Vol. 19
·期 7
·4310-4314
·
IF 1.093
Zhao Yue,Jiang Zhixiang,Wang Tao,Song Tong,Li Juping,Yang Ping
The stability of quantum dots (QDs) in phosphate buffered saline (PBS) solutions plays an important role in the bio-applications. Red-emitting CdTe QDs with high PL efficiency were prepared using thiogliycolic acid as a capping agent. The assembly of the QDs in various buffer components
was investigated. Using buffer components such as NaCl, KCl, and phosphate salts as scaffolds, the assembly of CdTe QDs occurred on a slide glass in the re-crystalline process of buffer components. The QDs were homogeneously assembled into the composites with leaf or flake shapes. The result
is utilizable for pattern manufacture in applications and domain growth was developed to test the change of photoluminescence (PL) properties and self-assembly of the QDs to form fractal structures. Compared with initial CdTe QD solutions, the PL spectrum of the QDs in the composite is narrowed.
The stability test indicated that H2PO−
4 and HPO2−
4 ions play important roles to decrease the PL of the QDs in PBS buffer solvents.
研究领域:
材料科学
·
生物医学工程
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DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2011
·
IF 1.797
Jinyun Peng,Xiaoya Hu
A new method for the determination of roxithromycin based on the fluorescence quenching of 3-mercaptopropionic acid-capped CdTe quantum dots (MPA-CdTe QDs) was developed. In ethanol medium, the fluorescence of CdTe quantum dots at 552 nm was quenched in the presence of roxithromycin. Based on this a simple, sensitive, and selective method for rapid determination of roxithromycin was described. Reaction time, interfering substances on the fluorescence quenching, and mechanism of the interaction of CdTe QDs with roxithromycin were investigated. After optimization, the proposed method allows the determination of roxithromycin over the range 25.0–350.0 μg ml −1 . The detection limit is 4.6 μg ml −1 . The proposed method was successfully applied to commercial capsules and tablets with satisfactory results. The recovery of the method was in the range of 96.8–102.5%.
研究领域:
分析化学
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药学
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产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2022
·
IF 9.221
Zhiwen Gan,Tian Zhang,Yongmei Hu,Shujun Zhen,Xiaoli Hu
Developing the ratiometric fluorescence probes for biothiols is significant. However, numerous ratiometric fluorescence probes were established based on a hybrid system or complex material. Herein, a simple ratiometric sensor for biothiols was developed by coupling fluorescence (FL) and second-order scattering (SOS) signals based on CdTe quantum dots (CdTe QDs). Under incident light, CdTe QDs with numerous surface traps possessed weak fluorescence but strong SOS due to the occurrence of resonance-enhanced Rayleigh scattering (RRS). With addition of biothiols, FL was enhanced, while SOS was quenched. Mechanistic studies indicated that fluorescence enhancement could result from surface passivation and a static quenching process of RRS could be responsible for the quench of SOS. The probe was employed for the quantification of glutathione (a typical biothiol) with a wide linear range (0.2–80.0 μmol L −1 ) and a low detection limit (0.05 μmol L −1 ). The sensor for biothiols exhibited outstanding merits, including fast response (1 min), simplicity, strong specificity and high sensitivity. Furthermore, the sensor showed a good performance in detecting the total biothiols in real samples. Overall, a new strategy was proposed for designing the simple ratiometric sensor based on quantum dots.
研究领域:
分析化学
·
生物医学
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产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-8
·
IF 4.58
Wang Jing,Peng Xiao,Li Daquan,Jiang Xiaochun,Pan Zaifa,Chen Aimin,Huang Liang,Hu Jun
A dually emitting quantum dot nanohybrid was designed for the fluorometric 2-wavelength determination of ascorbic acid (AA). The nanohybrid consists of red-emitting CdTe quantum dots (QDs) covalently linked to the surface of silica nanoparticles containing green-emitting CdSe QDs. The fluorescence of the red-emitting CdTe QDs (peaking at 616 nm) is first quenched by addition of KMnO 4 due to oxidation under formation of CdTeO 3 and TeO 2 . On addition of AA, the red fluorescence is restored due to the reduction of surface CdTeO 3 /TeO 2 to form CdTe. The green fluorescence of the green-emitting CdSe QDs (peaking at 522 nm), in contrast, remains constant and its intensity serves as a reference signal. Both kinds of QDs can be photoexcited at 380 nm. An easily distinguishable transition in fluorescence (from green to orange-red) can be observed on increasing the amount of added AA. Under optimal conditions, the ratio of the intensities of the red and the green fluorescence increases linearly in the 0.1 to 5.0 μM AA concentration range, and the detection limit is as low as 35 nM. The assay was successfully applied to the quantitation of AA in (spiked) fruit juice samples.
A new dually emitting CdSe@SiO 2 @CdTe nanohybrid was designed for ratiometric ultrasensitive fluorometric detection of ascorbic acid in fruit juice samples.
研究领域:
分析化学
·
纳米技术
·
食品科学
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产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2015
·
IF 2.353
Qin Li,Xuanping Tan,Jin Li,Li Pan,Xiaorong Liu
Water-soluble glutathione (GSH)-capped CdTe quantum dots (QDs) were synthesized. In pH 7.1 PBS buffer solution, the interaction between GSH-capped CdTe QDs and fenbendazole (FBZ) was investigated by spectroscopic methods, including fluorescence spectroscopy, ultraviolet–visible absorption spectroscopy, and resonance Rayleigh scattering (RRS) spectroscopy. In GSH-capped CdTe QDs solution, the addition of FBZ results in the fluorescence quenching and RRS enhancement of GSH-capped CdTe QDs. And the quenching intensity (enhanced RRS intensity) was proportional to the concentration of FBZ in a certain range. Investigation of the interaction mechanism, proved that the fluorescence quenching and RRS enhancement of GSH-capped CdTe QDs by FBZ is the result of electrostatic attraction. Based on the quenching of fluorescence (enhancement of RRS) of GSH-capped CdTe QDs by FBZ, a novel, simple, rapid and specific method for FBZ determination was proposed. The detection limit for FBZ was 42 ng mL −1 (3.4 ng mL −1 ) and the quantitative determination range was 0–2.8 μg mL −1 with a correlation of 0.9985 (0.9979). The method has been applied to detect FBZ in real simples and with satisfactory results.
研究领域:
分析化学
·
纳米生物学
·
药物分析
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产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
·
2016
·Vol. 62
·期 8
·2614-2621
·
IF 2.98
Luting Ling,Wei Wang,Cai-Feng Wang,Su Chen
The intrinsic low quantum yield (QY) of type II core shell quantum dots (QDs) composes the limitation for these heterostructured nanomaterials to be used in practical application. Herein, magnetic hyperthermia method is employed to intensify reaction process and facilely synthesize CdTe/CdSe heterostructured QDs with improved optical performance for the first time. The QY of the type II QDs is increased to 49% by further growing an inert ZnO layer. The type I interface between CdSe and ZnO helps confine electrons to the inner structure of the QDs, thus improving the QY. The successful preparation and performance enhancement of the CdTe/CdSe type II QDs via magnetic hyperthermia method demonstrate the great potential of this method for the preparation of other materials. Besides, the red-emission QDs are used as conversion materials in white light emitting diodes to reveal their promising application in practical illumination. © 2016 American Institute of Chemical Engineers AIChE J , 62: 2614–2621, 2016
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2019
·
IF 3.355
Di-Wei Zhang,Wei Zhou,Zhi-Guo Xia,Ze Zhang,Xiu-Ting Li
Red-emitting CdTe@SrSO 4 composites phosphors have been successfully fabricated via a two-step precipitation and following electrostatic assembly process. By adjusting the molar ratio of [Sr 2+ ]/[SO 4 2− ], the morphologies of SrSO 4 products vary from rods to rhombs with the increasing thickness, and comparative luminescence properties and phase formation mechanism of as-prepared CdTe@SrSO 4 composites have been investigated. The CdTe@SrSO 4 composites with a rod-like shape show optimum luminescence properties, as well as relatively good thermal stability. White LED prototype based on the CdTe@SrSO 4 composites has been fabricated, and a CIE coordinate of (0.400, 0.389), the correlated color temperature (CCT) of 3600 K, and color rendering index (CRI) of 94.3 can be achieved. The results indicate that CdTe@SrSO 4 composites may have potential in phosphor-converted white LEDs.
研究领域:
材料科学
·
光学工程
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产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2025
·
IF 4.2
Wanqiu Chen,Min Fang,Weiju Zhu,Cun Li
In this paper, a sensitive Gd 3+ aggregation-induced emission (AIE) fluorescent quantum dots probe for tetracycline detection was designed based on mercaptopropionic acid (MPA)-capped CdTe quantum dots (MPA-CdTe QDs). Gd 3+ can coordinate with the carboxyl groups on the surface of MPA-CdTe QDs, which triggers the aggregation-induced enhancement fluorescence emission effect. Notably, the fluorescence of Gd 3+ -modified MPA-CdTe QDs (Gd 3+ @MPA-CdTe QDs) is quenched by tetracycline (TC). This fluorescent probe exhibits excellent selectivity and sensitivity, achieving the limit of detection of 4.26 nM. Consequently, the MPA-CdTe QDs show an “on-off” fluorescence response. Tetracycline molecule coordinates with Gd 3+ in Gd 3+ @MPA-CdTe QDs, promoting further aggregation of the quantum dots and forming a network structure. Additionally, the inner filter effect (IFE) contributes to fluorescence quenching. The Gd 3+ @MPA-CdTe QDs probe can be applied for detecting TC in milk and tap water, demonstrating significant application potential. Furthermore, Gd 3+ @MPA-CdTe QDs can be utilized for TC detection in living cells.
研究领域:
分析化学
·
生物医学工程
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产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2013
·Vol. 24
·期 13
·135602
·
IF 3.842
Xin Guo,Cai-Feng Wang,Li-Hua Mao,Jing Zhang,Zi-Yi Yu,Su Chen
We report herein the controllable generation of encodable multi-fluorescence CdTe@carbon nanoparticles (CdTe@C NPs) via the pyrolysis of quantum dot/photonic crystal (QD/PC) guest–host ensembles. The precursors of CdTe/poly(styrene-co-glycidylmethacrylate) (PS-co-PGMA) QD/PC guest–host ensembles were initially formed via the assembly of epoxy groups of PCs and carboxyl groups on the surface of CdTe QDs, followed by a pyrolysis process to generate CdTe@C NPs. The as-prepared CdTe@C NPs not only integrate the optical properties for both the carbon and CdTe QD constituents, but also enable an impressive enhancement of the fluorescence lifetime for CdTe QDs. The multifarious fluorescent spectra coding for CdTe@C NPs was further generated through regulating the embedded sizes or concentrations of CdTe QDs and the excitation wavelength, and their applications in DNA detection and luminescent patterns were achieved.
研究领域:
材料科学
·
生物医学工程
·
光学
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 17
·10431-10438
·
IF 2.599
Chi Kailin,Li Qian,Meng Xianwei,Liu Li,Yang Haibin
Cadmium telluride (CdTe) micro-/nanoscale structures, including micropillars, micro-/nanorods and microflowers arrays, were successfully and controllably synthesized by electrodeposition on nickel substrates. Various characterization techniques, such as X-ray diffraction, scanning electron microscopy (SEM), energy-dispersive spectroscopy, selected area electron diffraction and Raman spectroscopy, were used to characterize the structures and properties of the as-prepared films. The structural analysis revealed that the as-synthesized CdTe films deposited in different concentrations of sulfuric acid system had cubic phases and possessed a polycrystalline structure with preferred orientations along the [111] direction. The results of SEM showed that the sulfuric acid concentrations had a significant effect on the morphology evolution from micropillar arrays to microflower arrays, and a possible formation mechanism was proposed. In addition, according to the results of the optical and photoelectrochemical performances in the visible-light region, the as-synthesized films have considerable potential to be applied as absorber materials in substrate configuration solar cells.
研究领域:
材料科学
·
纳米技术
·
光电化学
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产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 90
·48967-48972
·
IF 3.708
Yan Liang,Jiawei Tan,Jiexin Wang,Jianfeng Chen,Baochang Sun,Lei Shao
The effects of erythorbic acid (EA) and ethanol on the aqueous formation of cadmium telluride (CdTe) quantum dots (QDs) were explored in this work. Without N2 protection, CdTe QDs were synthesized with cadmium chloride and sodium hydrogen telluride as the Cd source and Te source, respectively, together with EA and with 3-mercaptopropionic acid (MPA) as the co-passivating ligand. The experimental results indicated that the use of the oxygen scavenger, i.e., EA, was critical for the formation of the CdTe QDs with reasonably good optical properties. Including ethanol during the synthesis improved the photoluminescence intensity. To attain good optical properties, it is also important to tune experimental parameters such as pH, temperature, reaction time, molar ratio of MPA/Cd, and sodium borohydride dosage. The very reason that EA promoted formation of CdTe QDs is because of its reducibility and passivation on the QD surface. The present study suggests that the use of EA and ethanol could be a practical means to promote the photoluminescence of CdTe.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
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