LUMINESCENCE
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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
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环境科学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 19
·15743-15749
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IF 3.201
Jing Wang,Daquan Li,Xinyue Liu,Yu Qiu,Xiao Peng,Liang Huang,Huimin Wen,Jun Hu
Aqueous N-acetyl-L-cysteine (NAC)-capped CdTe quantum dots (QDs) are prepared in one step by using sodium tellurite as a tellurium source and sodium borohydride as a reductant. The fluorescence (FL) emissions of the QDs are tunable between 514 and 753 nm. The effects of NAC/Cd, Cd/Te molar ratios, and pH values on the photoluminescence quantum yield (PLQY) of the QDs have been systematically studied. They display a high PLQY of up to 52.83%, with uniform narrow-size distributions. Furthermore, the obtained green- and red-emissive CdTe QDs are applied to explore the impact of QD size on the FL response toward glutathione (GSH) by a “turn-on” strategy. The results imply that the large-sized CdTe QDs with red FL are more suitable for detecting GSH than the small-sized QDs with green FL. The possible mechanism is also investigated.
研究领域:
材料科学
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生物化学
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产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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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
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纳米生物学
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药物分析
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DOI
PubMed
高影响因子
Journal of Nanomaterials
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2017
·
IF 1.871
Lei Du,Zhejun Liu,Suhua Jiang
We demonstrated the inkjet-printed CdTe quantum dots-polyurethane acrylate thin films and their potential application in the display devices. The water soluble CdTe QDs were synthesized through the wet chemistry and the emission wavelengths can be freely tuned during the preparation process. Combining with the UV curable resin polyurethane acrylate, the QDs inks were prepared and the influence of diluent and water content on the performance of resultant films was studied. The tensile stress of the films cured from the QDs inks with diluent increased from 10.6 MPa to 27.5 MPa and the low water content led to uniform polymer matrix. Furthermore, the existence of diluent and low water content would all improve the fluorescence stability of the thin films. Finally, the thin films can be deposited on different substrates and well controlled to meet the RGB color standard, which will pave the way to a simple, low-cost, large-scale, and highly reliable method for the application of flexible displays.
研究领域:
材料科学
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显示技术
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产品关联
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 5
·829
·
IF 5.719
Xiao-Lin Yuan,Xiao-Yi Wu,Miao He,Jia-Ping Lai,Hui Sun
A ratiometric fluorescence fiber-optical sensor system (RFFS) merging a Y-type optical fiber spectrometer and CdTe QDs composite functionalized with glutathione and mercaptopropionic acid (GMPA@CdTe-QDs) for highly selective and on-site detection of ciprofloxacin (CIP) in environmental water samples was designed. Our preliminary results suggested that the red fluorescence of the synthesized GMPA@CdTe-QDs was effectively quenched by CIP. Based on this, the RFFS/GMPA@CdTe-QDs system was successfully fabricated and used for highly selective and rapid detection of CIP on site in the concentration range from 0 to 45 μM with the detection limit of 0.90 μM. The established method exhibited good interference resistance to the analogues of CIP and provided a great potential platform for real-time detection of CIP residues in environmental water. In addition, the fluorescence quenching mechanism of GMPA@CdTe-QDs by CIP was also investigated by means of temperature effect, fluorescence lifetime, ultraviolet (UV) visible absorption, and fluorescent spectra. Our results suggested clearly that the red fluorescence of GMPA@CdTe-QDs was quenched by CIP via the photoinduced electron-transfer (PET) mode.Keywords:ratiometric fluorescence;optical fiber sensor;GMPA@CdTe-QDs;ciprofloxacin;on-site detection
研究领域:
环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
OPTICS AND SPECTROSCOPY
·
2015
·Vol. 118
·期 5
·748-755
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IF 0.723
Ge Baoyu,Li Zhigang,Xie Yuanzhe,Yang Lingling,Wang Ruiyong
Two novel and convenient methods for the determination of lincomycin (LCM) in aqueous solutions have been developed. The first method was based on the enhanced fluorescence of thioglycolic acidcapped CdTe quantum dots (TGA-CdTe QDs) by LCM. For the second method, the introduction of LCM could induce the aggregation of gold nanoparticles (AuNPs), displaying distinct changes in color and in UVvis spectra. Under optimal conditions, the enhanced fluorescence intensity was linearly proportional to LCM concentration in the range of 1–240 μg mL −1 with a detection limit of 2.63 × 10 −1 μg mL −1 . The second platform is capable of determining LCM in ranges from 1.00 × 10 −3 to 2.00 × 10 −2 μg mL −1 and from 3.00 × 10 −2 to 1.20 × 10 −1 μg mL −1 with a detection limit of 1.27 × 10 −4 μg mL −1 . Both methods were used for rapid detection of LCM in real samples with satisfactory results. Comparisons between the two methods were made.
研究领域:
分析化学
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纳米生物学
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DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Yizhong Shen,Shaopu Liu,Jidong Yang,Linlin Wang,Xuanping Tan,Youqiu He
A novel and sensitive turn-on fluorescent biosensor for herring sperm DNA (hsDNA) detecting was designed based on hsDNA-induced fluorescence enhancement of Sm 3+ -modulated glutathione (GSH)-capped CdTe quantum dots (QDs). The fluorescent biosensor was based on the following two properties. First, the high fluorescence of GSH-capped CdTe QDs could be effectively quenched by Sm 3+ due to the binding of Sm 3+ to the GSH on the surface of the QDs and the electron transfer from the photoexcited GSH-capped CdTe QDs to Sm 3+ . Second, the high affinity of hsDNA to Sm 3+ enabled Sm 3+ to be dissociated from the surface of GSH-capped CdTe QDs to form more stable complex with hsDNA in aqueous solution, thereby enhancing the fluorescence of Sm 3+ -modulated GSH-capped CdTe QDs. Experimental results showed that the enhanced fluorescence intensity of Sm 3+ -modulated GSH-capped CdTe QDs was directly proportional to the concentration of hsDNA in the range from 0.012 to 14.0 μg mL −1 with a good correlation coefficient of 0.9977, and the detection limit (3 σ / S ) was 3.61 ng mL −1 . To further investigate perfect analysis performance, the developed biosensor was applied to the determination of hsDNA in synthetic samples and human fresh serum samples with satisfactory results.
研究领域:
生物化学
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分析化学
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DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Xiaoya Bi,Libo Li,Lijun Luo,Xiaohong Liu,Jiamin Li,Tianyan You
Semiconductor quantum dots (QDs) and tungsten disulfide nanosheets (WS 2 NTs) have been widely studied in photocatalysis and photoelectrochemistry as representative electron donor–acceptor pairs but rarely in fluorescence sensing. In this study, we investigated the effect of WS 2 NTs on the fluorescence signal of cadmium telluride (CdTe) QDs by grafting an aptamer as a bridge between them. The corresponding quenching mechanism was systematically explored, and results described the photoinduced electron transfer (PET) from excited CdTe QDs to WS 2 NTs. Based on these results, a novel ratiometric fluorescence aptasensor was developed for zearalenone (ZEN) determination by innovatively introducing exonuclease I to digest the aptamer of ZEN and control the PET between CdTe QDs and WS 2 NTs. The designed aptasensor exhibited an acceptable linear range and detection limit (0.1 pg mL −1 ), and superior accuracy and selectivity. This ratiometric fluorescence aptasensor was also used to monitor ZEN in rice and corn flour.
研究领域:
分析化学
·
食品安全检测
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DOI
PubMed
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 5
·633-640
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IF 1.815
Jun Yao,Mei Yang,Yixiang Duan
Highly luminescent CdTe quantum dots (QDs) were prepared through a fast, facile, and straightforward method. The crystal structure, particle size, optical properties as well as molecular interactions between the CdTe QDs and their capping agents have been investigated by high resolution transmission electron microscopy, selected area electron diffraction, scanning transmission electron microscope–energy dispersive x-ray spectroscopy, UV-vis absorption, photoluminescence, and Fourier transform infrared, respectively. The results illustrate that the CdTe nanoparticles exhibit cubic structure and the average crystallite size is 2.3 nm. Meanwhile, fluorescence and UV-vis spectroscopic techniques were used to study the interaction between hemin and the well-defined CdTe QDs. In weak basic media, the fluorescence of CdTe QDs was quenched notably by hemin, and the quenching values were proportional to the concentration of the quencher in a certain range. The quenching mechanism was discussed to be a dynamic quenching procedure, collisional process, and hemin as a fluorescence quencher donated its electron to CdTe QDs to occupy the hole and accordingly disrupted the electron–hole recombination.
研究领域:
纳米材料科学
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生物分析化学
·
光学
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DOI
高影响因子
OPTICS AND SPECTROSCOPY
·
2013
·Vol. 115
·期 4
·596-600
·
IF 0.559
Wang Rui-yong,Wu Jing,Wang Lv-jing,Wang Rui,Dou Huan-jing
A novel CdTe quantum dots (QDs) based technology platform was established in aqueous solution. It can perform accurate and simple determination of aminophylline concentration in pharmaceutical samples with satisfactory results. Under optimum conditions, the relative fluorescence intensity of CdTe quantum dots is linearly proportional aminophylline concentration from 2.00 to 80.0 μg mL −1 with a correlation coefficient of 0.9979 for aminophylline determination and a detection limit of 0.531 μg mL −1 .
研究领域:
分析化学
·
药剂学
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纳米医学
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药物分析
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生物传感
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DOI
高影响因子
JOURNAL OF FLUORESCENCE
·
2023
·Vol. 33
·期 5
·2075-2084
·
IF 2.7
Chen Ting,Ge Zicheng,Fang Min,Zhu Weiju,Li Cun
In this paper, a novel amino acid surface-functionalized semiconductor CdTe quantum dot fluorescent probe amidated by carboxyl and amide groups was synthesized to detect pyrophosphate ions (P 2 O 7 4− , PPi). L-Arginine (L-Arg) was grafted onto cysteine modified CdTe quantum dots (Mea-CdTe QDs) to form a new L-Arginine-functionalized quantum dot fluorescent probe (L-Arg@Mea-CdTe). The prepared probe has good optical properties with multiple grafted functional groups on the surface. The guanidine group of the L-Arg@Mea-CdTe fluorescent probe is strongly basic and will be fully protonated under physiological conditions. The resulting hydrogen bonds bound to pyrophosphate lead to significant changes in the fluorescence of CdTe quantum dots. IR and XPS characterization were performed to confirm it. The addition of PPi induces a significant fluorescence quenching of L-Arg@Mea-CdTe in aqueous solution. The fluorescent QDs probe can also detect pyrophosphate with good sensitivity and anti-interference performance. The detection limit of the L-Arg@Mea-CdTe fluorescence probe for PPi is as low as 0.30 μM. In addition, the novel nano-fluorescent probe was successfully applied to detect PPi in water and in cell imaging.
研究领域:
分析化学
·
纳米技术
·
生物成像
·
材料科学
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DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 12
·12172-12178
·
IF 1.338
Guo Yajin,Liu Zheng,Han Guo-Cheng,Li Wei,Hu Yajun,Chen Zhencheng
CdTe quantum dots (QDs) modified with 4-aminoantipyrine shrink 2,5-dihydroxylbenzadehyde Schiff base were synthesized and characterized using infrared spectrum (FTIR), ultraviolet-visible spectrum (UV-vis), photoluminescence (PL), TEM and thermal gravimetric analysis (TGA). The as-prepared
fluorescent switch was subjected to the determination of Pb2+ by the fluorescence resonance energy transfer (FRET). There were two successive linear relationships between the fluorescent intensity and Pb2+ concentration, in the concentration range of 0.01–100 μmol/L
and 100–10000 μmol/L with r = 0.9994 and r = 0.9996, respectively, and accompanying with 3.0 nmol/L limit of detection. The proposed method was successfully applied to detect Pb2+ in industrial sewage samples and the results showed that the relative
standard deviation was less than 4.1%, with a recovery of 96.7–102%.
研究领域:
分析化学
·
环境科学
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DOI
高影响因子
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