SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2018
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IF 2.88
Le Wu,Zheng-Zhong Lin,Jun Zeng,Hui-Ping Zhong,Xiao-Mei Chen,Zhi-Yong Huang
A magnetic fluorescent probe of CdTe QDs/nano-Fe 3 O 4 @MIPs was prepared using CdTe QDs and Fe 3 O 4 nanoparticles as co -nucleus and molecularly imprinted polymers (MIPs) as specific recognition sites based on a reverse microemulsion method. With the specific enrichment and magnetic separation properties, the probe of CdTe QDs/nano-Fe 3 O 4 @MIPs was used to detect malachite green (MG) in fish samples. The TEM analysis showed that the particles of CdTe QDs/nano-Fe 3 O 4 @MIPs were spherical with average diameter around 53 nm, and a core-shell structure was well-shaped with several Fe 3 O 4 nanoparticles and CdTe QDs embedded in each of the microsphere . Quick separation of the probes from solutions could be realized with a magnet, indicating the excellent magnetic property of CdTe QDs/nano-Fe 3 O 4 @MIPs. The probe exhibited high specific adsorption towards MG and excellent fluorescence emission at λ em 598 nm. The fluorescence of CdTe QDs/nano-Fe 3 O 4 @MIPs could be linearly quenched by MG at the concentrations from 0.025 to 1.5 μmol L −1 . The detection limit was 0.014 μmol L −1 . The average recovery of spiked MG in fish samples was 105.2%. The result demonstrated that the as-prepared CdTe QDs/nano-Fe 3 O 4 @MIPs could be used as a probe to the detection of trace MG in fish samples.
研究领域:
分析化学
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食品安全
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材料科学
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Zhengwei Zhang,Jiao Chen,Qiulian Yang,Kai Lan,Zhengyu Yan,Jianqiu Chen
Currently, the bio-immobilization methods displayed great potential for the removal and recycle of highly toxic metals depending on their gentle and orderly regulated cellular environment. Herein, we have presented a facile and eco-friendly strategy for bio-immobilizing cadmium (Cd) ions and to harvest CdSe quantum dots (QDs) using microalgae cells as bio-reactors. The production process has good environmental benefits for recycling hazardous Cd metal. The biosynthesized CdSe QDs exhibited superior optical properties, good water-solubility, high crystallinity structure, and were monodispersed sphere nanoparticles with approximate range of 5–6 nm in size, clearly comfirmed by the inversed fluorescent microscope, Ultraviolet-visible, photoluminescence, transmission electron microscopy analyses and so on. Owning to their fluorescence quenching effect, the as-obtained CdSe QDs could be deemed as an effective fluorencent nanoprobe for imatinib detection. The linear range for imatinib was calculated to be from 10.43 μg mL −1 to 417.30 μg mL −1 with a low detection limit of 0.014 μg mL −1 . More strikingly, the possible formation mechanism of CdSe QDs in algal cells was preliminarily speculated that could be related with the intracellular GSH, which could provide new insights for the possibility for environmental transformation of poisonous metals to fluorescent QDs.
研究领域:
生物化学
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环境科学
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纳米医学
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高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2018
·
IF 3.849
Chunxue Li,Huinan Che,Chunbo Liu,Guangbo Che,Paul. A. Charpentier,William Z. Xu,Xiuyan Wang,Lihui Liu
In this study, we report a facile and green strategy to produce graphitic carbon nitride quantum dots (g-C 3 N 4 QDs)/BiVO 4 Z-scheme nanoheterostructure, which is composed by g-C 3 N 4 QDs assembled on the surface of mesh-like BiVO 4 crystals. As compared with pure BiVO 4 , the g-C 3 N 4 QDs/BiVO 4 composite showed significantly enhanced photocatalytic performance towards degradation of rhodamine B (RhB) and Tetracycline (TC) under visible light irradiation, which is attributed to the increased surface area, (increased number of photocatalytically active sites) and the improved efficiency of separation of photogenerated electron-hole pairs through an efficient charge transfer Z-scheme system. The stability and durability of photocatalyst are also discussed in detail. Moreover, the possible enhanced photocatalytic mechanism was put forwarded and explained by the electron spin resonance (ESR) spin-trap technique and active species trapping experiments. The successful implementation of this work will have guiding significance for the preparation of photocatalysts, and provide theoretical basis and experimental guidance for future development of Z-scheme photocatalytic mechanism of the hybrid photocatalysts with better performance.
研究领域:
材料科学
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环境科学
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光催化
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高影响因子
MICROCHIMICA ACTA
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2023
·Vol. 190
·期 8
·1-9
·
IF 5.7
Hao Xuanxuan,Liu Zhimin,Fan Yunfeng,Wang Jie,Cui Chen,Hu Leqian
A novel electrochemiluminescence (ECL) aptasensor, using graphite carbonitride (g-C 3 N 4 ) capped CdS quantum dots (CdS QDs@g-C 3 N 4 ) and Au nanoparticles decorated triethanolamine (AuNPs@TEOA) as dual coreactants, was proposed for the determination of mucin 1 (MUC1). Higher ECL efficiency was acquired due to the double enhancement contribution of CdS QDs and TEOA to Ru (bpy) 3 2+ ECL. Additionally, AuNPs@TEOA also acted as nanocarrier for MUC1 aptamer immobilization. After the aptasensor was incubated in target MUC1, the decreased ECL emission was obtained because of the poor conductivity of MUC1. The ECL aptasensor displayed a good linear correlation for MUC1 in the range 0.1 pg mL −1 -1000 ng mL −1 , and the detection limit was 33 fg mL −1 . MUC1 spiked into human serum samples was quantified to assess the practicability of the ECL aptasensor. Graphical abstract
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JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
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2023
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IF 2
Yajie Liu,Yao Zhu,Xinyu Liu,Liming Dong,Qinglin Zheng,Shu Kang,Yahui He,Jing Wang,A. M. Abd El-Aty
The copper ion was detected rapidly by a novel sensing membrane in this paper for its damage to health and the environment. CdSe/ZnS QDs modified polyethersulfone membrane (QDs@PESM) was made by phase-inversion method using a membrane separation technique and quantum dots (QDs). When the sample passed through the membrane, the copper ions in the sample caused the membrane’s fluorescence to be quenched. The fluorescence quenching value of the membrane is used to calculate the concentration of copper ions. With R2= 0.9964, Cu2+could be quantitatively detected over a wide concentration range (10–1000 μg/L). The method’s LOD and LOQ were 4.27 and 14.23 μg/L, respectively. When the CdSe/ZnS QDs@PESM was used to analyze Cu2+ in various real drinks, including well water, baijiu, orange juice, beer, and milk, the recovery ranged from 79.1 to 123.9%, indicating that the CdSe/ZnS QDs@PESM can be used as a rapid, simple and reliable method to determine Cu2+ in various matrices.
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高影响因子
RSC Advances
·
2022
·Vol. 12
·期 55
·35763-35769
·
IF 4.036
Pu Li,Chen Luo,Xiaoxiao Chen,Chaobiao Huang
An off–on fluorescence aptasensor was developed for trace thrombin detection based on fluorescence resonance energy transfer (FRET) between CdS QDs and gold nanoparticles (AuNPs). Using DNA pairwise hybridization of the aptamer to the complementary DNA (cDNA), the CdS QDs (energy donor) were tightly coupled to the AuNPs (energy acceptor), resulting in the occurrence of FRET and there was a dramatic fluorescence quenching of CdS QDs (turn off). When the thrombin was added to the fluorescence aptasensor, the specific binding of the aptamer to the target formed a G-quadruplex that caused the AuNPs receptor to detach and the DNA duplex to be disassembled. The process would inhibit the FRET which contribute to the recovery of fluorescence (turn on) and an “off–on” fluorescence aptasensor for thrombin detection was constructed accordingly. Under optimal conditions, the fluorescence recovery showed good linearity with the concentration of thrombin in the range of 1.35–54.0 nmol L−1, and the detection limit was 0.38 nmol L−1 (S/N = 3, n = 9). Importantly, the fluorescence aptasensor presented excellent specificity for thrombin, and was successfully applied to the quantitative determination of thrombin in real serum with satisfactory recoveries of 98.60–102.2%.
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高影响因子
Applied Materials Today
·
2022
·
IF 8.663
Enhui Ma,Guolong Sun,Fanglin Duan,Hongguang Wang,Hong Wang
A direct Z-scheme heterojunction coupling hierarchical nanosheet MoS 2 nanotubes with CuInS 2 quantum dots was successfully prepared to fabricate MoS 2 NTs/CuInS 2 QDs photoanodes for enhanced photoelectrocatalytic (PEC) activity. The MoS 2 NTs with stacked nanosheets and tubular structure have high surface area and abundant basal edges, which can create more active reaction sites. Simultaneously, the continuous and broad photo-absorption range of MoS 2 NTs improved the utilization of visible-light and increased the separation efficiency of photo-induced electron-hole pairs. The integration of MoS 2 NTs with CuInS 2 QDs onto Cu foil yielded direct Z-scheme heterojunction photoanode. The formation of Z-scheme heterojunction inhibited the recombination of photo-induced electron-hole pairs and produced more active electrons and holes to facilitate the generation of highly active species. Under visible light illumination, the prepared MoS 2 NTs/CuInS 2 QDs photoanode showed superior PEC activity by applying a suitable bias voltage. In PEC process, the generated holes, hydroxyl radicals and superoxide radicals with strong oxidative were employed to achieve highly efficient degradation of tetracycline. The prepared photoanode exhibited high stability, reusability, and broad application potential in PEC degradation of organic pollutants. Moreover, a possible mechanism of the transfer pathway of photo-induced electron-hole pairs on the MoS 2 NTs/CuInS 2 QDs photoanode was proposed based on a direct Z-scheme heterojunction.
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CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Hanwen Zhu,Min Cheng,Junchun Li,Supeng Yang,Xuyong Tao,Yongqiang Yu,Yang Jiang
It has been proved that perovskite quantum dots (QDs) have great potential in optoelectronic devices because of their excellent optical performance. However, low stability against water and oxygen environment hinders the commercial application of down-conversion display films on account of its highly ionic nature and low formation energy. Here, we demonstrate a convenient method to obtain a uniform, large-area water-oxygen-resistant quantum dot-polymer composite film via illuminating FAPbBr 3 QDs and methyl methacrylate (MMA) under white light emitting diode. We find that FAPbBr 3 QDs act as photo initiators, leading to the polymerization of organic monomers around the quantum dots. The obtained FAPbBr 3 QDs-polymer nanocomposites are independently dispersed coated with about 10 nm thick polymerized methyl methacrylate (PMMA). Due to the well protection of covered PMMA, the FAPbBr 3 QDs/PMMA nanocomposites show high tolerance to water and oxygen, and the increased PLQY and lifetime indicate the reduction of non-radiative recombination centers. Furthermore, the FAPbBr 3 QDs/PMMA nanocomposites are easy to produce large area films, and no agglomeration during films production by knife coating process. Then uniform, strong fluorescence, transparent and stable blue, green and red nanocomposite films can be prepared by optimizing the viscosity via controlling the reaction time. Finally, white LED was fabricated with a Lumen Efficiency of 80.4 m/W and Color Rendering Index of 90. Our work suggests that illuminated polymerization of perovskite quantum dots under white light emitting diode provides a simple and effective method to commercialization
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2020
·
IF 3.232
Hengye Chen,Shuo Wang,Haiyan Fu,Hongliang Xie,Wei Lan,Lu Xu,Lei Zhang,Yuanbin She
Silver ions , as a commonly used industrial heavy metal, tends to deposit in the body and induce many diseases. In this work, modified CdTe QDs with green and red emission were synthesized to assemble dual-QDs, which could be efficient and selective utilized for Ag + determination through the electron transfer progress between surface functional group of dual-QDs and Ag + , and the aggregation of Ag + on the surface of dual-QDs. Under the appropriate pH value and volume ratio, the interaction between the surface functional groups of assembled dual-QDs reduce the affinity of Hg 2+ in this system. The fluorescent signal of dual-QDs simultaneously attenuation or enhancement in the same proportion remove the interference of Cu 2+ and other metal ions . Therefore, this method can selectively detect Ag + without any masking agents. The linear region of detection was from 0 to 800 nmol/L (R 2 > 0.998), and low of detection (LOD) was 7.7 nmol/L, which could meet the corresponding standards of World Health Organization (WHO) and Environmental Protection Agency (EPA). This effective proposed dual-QDs ratios fluorescent probe has been applied to detect Ag + in real environment water, tea and Citri Reticulatae Pericarpium (CRP) water.
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高影响因子
ANALYTICA CHIMICA ACTA
·
2016
·
IF 4.712
Yi Liang,Xiaolin Huang,Ruijin Yu,Yaofeng Zhou,Yonghua Xiong
The present study described a novel fluorescence enzyme-linked immunosorbent assay (ELISA) used to detect ochratoxin A (OTA) by using the glucose oxidase (GOx)-mediated fluorescence quenching of mercaptopropionic acid-capped CdTe quantum dots (MPA-QDs), in which GOx was used as an alternative to horseradish peroxidase (HRP) for the oxidization of glucose into hydrogen peroxide (H 2 O 2 ) and gluconic acid . The MPA-QDs were used as a fluorescent signal output, whose fluorescence variation was extremely sensitive to the presence of H 2 O 2 or hydrogen ions in the solution. Under the optimized conditions, the proposed fluorescence ELISA demonstrated a good linear detection of OTA in corn extract from 2.4 pg mL −1 to 625 pg mL −1 with a limit of detection of 2.2 pg mL −1 , which was approximately 15-fold lower than that of conventional HRP-based ELISA. Our developed fluorescence immunoassay was also similar to HRP-based ELISA in terms of selectivity , accuracy, and reproducibility. In summary, this study was the first to use the GOx-mediated fluorescence quenching of QDs in immunoassay to detect OTA, offering a new possibility for the analysis of other mycotoxins and biomolecules.
研究领域:
食品科学
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分析化学
·
毒理学
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高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2013
·Vol. 14
·期 4
·8603-8610
·
IF 2.464
Hua Kuang,Gang Cui,Xiujin Chen,Honghong Yin,Qianqian Yong,Liguang Xu,Chifang Peng,Libing Wang,Chuanlai Xu
Simple immuno-magnetic separation tandem fluorescent probes based on quantum dots-antibody (QDs-Ab) were developed to detectSalmonellawith sensitivity of 500 cfu mL−1. With two monoclonal antibodies, which recognize different antigenic determinant on the surface ofSalmonella, we prepared antibody-coated magnetic nanoparticles (MNPs) and conjugates of QDs-Ab. The immune-magnetic beads were verified with high enrichment efficiency forSalmonella(90%). A sandwich structure formed if theSalmonellasolution was mixed together with immune-beads and QDs-Ab, and the fluorescent single from QDs was related to the amount ofSalmonella. A linear response between fluorescence intensity and various concentrations ofSalmonella(2.5 × 103to 1.95 × 108cfu mL−1) were observed with this proposed method. The total assay time forSalmonellawas 30 min, and no cross-reaction to other microbial strains, such asStaphylococcus aureus,Escherichia coli(E. coli) andEscherichia coli O157:H7(E. coli O157:H7), were found using this detection system. All our results showed that the simple homogeneous immunoassay could be applied inSalmonellascreening without time-consuming extra-enrichment of bacteria.Keywords:Salmonella;fluorescent immunoassay;magnetic separation;quantum dots
研究领域:
生物技术
·
微生物学
·
纳米技术
·
食品安全
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 7
·4811-4817
·
IF 3.201
Weiwei Chen,Shan Yu,Yunqian Zhong,Xiang-Bing Fan,Li-Zhu Wu,Ying Zhou
Quantum dot (QD)/TiO2 composites are widely used materials in the field of photocatalysis. However, the influence of different exposed facets of TiO2 in composites on photocatalytic hydrogen evolution is rarely reported. In this work, CdSe QD–TiO2 composites with dominant {001} or {101} faceted anatase were synthesized and specifically characterized using X-ray powder diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. Photocatalytic hydrogen evolution tests reveal that {001}-TiO2/CdSe QDs exhibit a 213.1- and 9.0-fold increase in photocatalytic activity compared to {001}-TiO2 and CdSe QDs, respectively. Notably, the photocatalytic activity of {001}-TiO2/CdSe QDs is 2.2 times higher than that of {101}-TiO2/CdSe QDs. Based on the results from UV-Vis diffuse reflectance spectroscopy, Brunauer–Emmett–Teller surface area testing, Mott–Schottky testing and steady-state and time-resolved emission spectroscopy, the main reason for enhanced photocatalytic activity is the faster electron transfer from CdSe QDs to {001}-TiO2 compared with to {101}-TiO2. This research on tailored facets in QD/TiO2 composites provides primary insights for the design of effective photocatalysts.
研究领域:
材料科学
·
光催化
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高影响因子
危险品化学品经营许可证（带存储）