Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-10
·
IF 3.578
Wang Shan,Fu Jing,Zhang Fang,Huan Ruirui,Liu Ting,Zeng Xingguo
Abstract A 0D/2D (0-dimensional/2-dimensional) nanostructure was designed by self-assembly of N–C QDs and carboxylated g-C 3 N 4 nanosheets and used as a fluorescence resonance energy transfer (FRET) fluorescent sensor. The N–C QDs/g-C 3 N 4 nanosheets were synthesized via the amino group on the N–C QD surface and the –COOH of the carboxylated g-C 3 N 4 nanosheets. The mechanism of detection of metronidazole (MNZ) by N–C QDs/g-C 3 N 4 nanocomposites is based on FRET between negatively charged N–QDs and positively charged carboxylated g-C 3 N 4 nanoparticles. N–C QDs/g-C 3 N 4 nanostructures displayed good responses for the detection of MNZ at normal temperature and pressure. The decrease in the fluorescence intensity showed a good linear relationship to MNZ concentration within 0–2.6 × 10 −5 mol/L, and the detection limit was 0.66 μM. The novel FRET sensor will have a great potential in clinical analysis and biological studies. Graphical Abstract
研究领域:
分析化学
·
生物医学
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 4
·2597-2609
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IF 4.682
Zhai Wangyi,Cao Yuanming,Li Yifei,Zheng Min,Wang Zuoshan
The exploration of novel and multifunctional coatings through composite nanomaterials design is crucial for developing next-generation polyester fabrics. Herein, we report an efficient approach of self-assembling MoO 3– x QDs on MXene (Ti 3 C 2 T x ) to fabricate multifunctional polyester fabrics. In a typical preparation, MoO 3– x QDs with an average size of 5 nm were uniformly distributed on the surface of MXene nanoflakes upon UV light. Then, polyester fabrics were coated with MoO 3– x QDs/MXene by dipping. The results demonstrated that the coated fabric had a decreasing trend in the electrostatic half-period from more than 60 s (untreated fabric) to 0.15 s and had excellent washing fastness. In addition, a similar phenomenon was found in smoke suppression, with the coated fabric producing 36.16% less smoke. More importantly, the sterilization rate of the coated fabric had reached 99% to E. coli and S. aureus under sunlight owing to the strong response of MoO 3– x QDs/MXene. This work provides a novel and facile strategy to design multifunctional coatings.
研究领域:
材料科学
·
纺织工程
·
纳米技术
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 29
·7645-7653
·
IF 3.307
Zhang Dong-Ping,Wang Ling-E,Liu Xiao-Ying,Luo Zhi-Hua,Zheng Lei,He Yun,Zhang Bo
A facile and feasible photoelectrochemical (PEC) immunoassay based on plasmon-enhanced energy transfer between gold nanoparticles (AuNPs) and CdS quantum dots (QDs)/g-C 3 N 4 nanosheets was developed for the ultrasensitive detection of lipoprotein-associated phospholipase A 2 (Lp-PLA 2 ). To construct such a sensing platform, the immunosensor was prepared by immobilizing Lp-PLA 2 on a CdS QDs/g-C 3 N 4 -modified electrode. A competitive-type immunoreaction was utilized for Lp-PLA 2 detection, with AuNP-labeled anti-Lp-PLA 2 antibody used as the competitor. Introducing AuNPs with the specific antibody for the antigen target Lp-PLA 2 led to heavy quenching of the photocurrent of CdS QDs/g-C 3 N 4 due to the plasmon-enhanced energy transfer between AuNPs and CdS QDs. The quenching efficiency decreased with increasing target Lp-PLA 2 concentration. Under optimal conditions, the PEC immunosensor presented a good photocurrent response to the target Lp-PLA 2 in the dynamic linear range of 0.01–300 ng mL −1 , with a low detection limit of 5.3 pg mL −1 . Other biomarkers and natural enzymes did not interfere with response of this system. The reproducibility and accuracy of this method for the analysis of human serum specimens were evaluated, and the results given by the method developed here were found to closely correspond to the results obtained with commercial Lp-PLA 2 ELISA kits. Importantly, this protocol offers promise for the development of exciton–plasmon interaction-based PEC detection systems.
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研究领域:
分析化学
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生物化学
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纳米技术
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RSC Advances
·
2014
·Vol. 4
·期 86
·45939-45945
·
IF 3.708
Wenjun Dong,Yan Cheng,Liang Luo,Xiaoyun Li,Lina Wang,Chunguang Li,Lifeng Wang
Hierarchical SiO2–QDs@SiO2 (QDs = CdTe, PbTe or PbS) nanostructures have been prepared by an integrated synthesis and self-assembly strategy using 3-mercaptopropionic acid (MPA) to stabilize the QDs and NaOH to control the self-assembly of QDs on the SiO2 nanobead carriers. 3–10 nm QDs covered with a 1–2 nm SiO2 shells were separately embedded on the surface of 50 nm SiO2 nanobead carriers, resulting in hierarchical SiO2–QDs@SiO2 nanostructures. MPA and NaOH played important roles in the nucleation and growth of QDs, etching the SiO2 nanobead carriers to the colloidal surface, and the self-assembly of the QDs on viscous SiO2 nanobead carriers. The hierarchical SiO2–QDs@SiO2 nanostructures possess various advantages: (I) the growth of QDs and their self-assembly on SiO2 nanobead carriers were performed in a one-pot reaction by a facile aqueous phase refluxing approach; (II) the SiO2 shell with 1–2 nm in thickness can prevent the leakage of toxic Cd2+ or Pb2+ and avoid photobleaching or environmental pollution; (III) the surface of hierarchical SiO2–QDs@SiO2 nanostructures can be easily functionalized through silane-coupling chemistry. Because of the excellent photoluminescence and biocompatibility, the hierarchical SiO2–QDs@SiO2 nanostructures modified by carboxyl (–COOH) active group can be available for covalent coupling to various biomolecules, which have shown potential applications in fingerprint detection and in vivo cell imaging.
研究领域:
纳米材料
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材料科学
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纳米技术
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光致发光
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生物成像
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法医学
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胶体化学
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SEPARATION AND PURIFICATION TECHNOLOGY
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2026
·
IF 9.1
Jun Chen,Kai Jiang,Tianxiang Hang,Ciyang Zhang,Ruijie Che,Mingzhu Xia,Wu Lei
A covalently coupled CdTe/NH₂-UiO-66(Eu) ratiometric probe was developed. • Adsorption experiments and IGM analysis indicated rapid glyphosate uptake mediated by multiple interfacial interactions. • Glyphosate enhanced blue emission and weakened green emission for ratiometric readout. • Lifetime, XPS, and TD-DFT analyses provided mechanistic insights into the fluorescence response. Rapid detection and effective adsorptive capture of glyphosate from water are important for aquatic environmental monitoring and agricultural product safety. To address the susceptibility of single-emission fluorescence signals to external fluctuations and the limited glyphosate-capture capability of conventional fluorescent probes, a dual-emission platform integrating glyphosate adsorption with ratiometric fluorescence detection was constructed through the covalent interfacial assembly of Eu 3+ -modified NH 2 -UiO-66 and mercaptopropionic acid-modified CdTe QDs. Adsorption experiments and independent gradient model (IGM) analysis indicated that the composite exhibited rapid glyphosate uptake mediated by multiple interfacial interactions. In the presence of glyphosate, CdTe/NH 2 -UiO-66(Eu) exhibits enhanced blue emission at 434 nm and weakened green emission at 524 nm, producing a pronounced I 434 /I 524 ratiometric response. The fluorescence intensity ratio shows a linear dependence on glyphosate concentration over the range of 0.5–80 μM, with a limit of detection of 0.217 μM. Based on fluorescence lifetime results and XPS analysis, the ratiometric fluorescence response mechanism of the probe was elucidated. TD-DFT calculations further suggested that glyphosate modifies the excited-state charge distribution and charge-transfer characteristics associated with the MOF component. This work provides an interfacial assembly strategy for constructing MOF-based platforms that combine adsorptive glyphosate capture with ratiometric fluorescence sensing. Download: Download high-res image (182KB) Download: Download full-size image
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MICROCHEMICAL JOURNAL
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2026
·
IF 5.2
Yi Duan,Meilin Liu,Dianhui Men,Yiyao Luo,Xuhui Xia,Li Wang,Fei Deng,Danqun Huo,Changjun Hou
CA15–3 is a vital biomarker for monitoring and evaluating treatment efficacy in breast cancer patients, especially those with advanced-stage disease. Conventional immunoassays face limitations, including high cost, limited sensitivity, and dependence on potentially error-prone single-fluorescence signal outputs. To address these challenges, we designed a dual-signal-emitting sensor based on CdTe quantum dots@ZIF-8 nanomaterials, incorporating both the CRISPR/Cas12a system and catalytic hairpin assembly (CHA) technology. The binding of CA15–3 to its specific aptamer inhibits the CHA cascade reaction, thereby preventing the generation of double-stranded DNA activators necessary to initiate Cas12a-mediated trans-cleavage activity. As a result, FAM-ssDNA is extensively adsorbed onto the CdTe QDs@ZIF-8 surface, where efficient electron transfer effectively quenches its fluorescence. The incorporation of the aptamer facilitates dual-signal amplification through both the CHA and CRISPR/Cas12a systems, achieving a detection limit of 0.131 U/mL. This dual-signal output mechanism provides the system with an internal reference function, thereby significantly improving the reliability of the results. Overall, this work establishes a novel tumor biomarker detection platform that combines high sensitivity with excellent robustness.
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 14
·147520
·
IF 3.721
Xinyi Wang,Liubing Kong,Shuqi Zhou,Tao Liang,Hao Wan,Ping Wang
Photoluminescence (PL) sensors based on quantum dots (QDs) are difficult to achieve exact detection in sample waters. In this paper, polyvinyl alcohol (PVA) based CdTe/ZnS/CdS QDs and fluorescein isothiocyanate (FITC) fluorophores were used to build a ratiometric PL sensor. Combining with the homemade smartphone-based PL E-eye, the Cd2+ exact detection can be achieved. PVA was used to connect QDs and FITC fluorophores without unnecessary ligand exchange and purification. For QDs fluorophore, ethylenediaminetetraaceticacid (EDTA) was used on the surface to induce the specifically Cd2+ recognition site. For FITC fluorophore, the PL remains unchanged in this experiment. Thus, the ratio of two fluorophores can be used to provide a built-in correction. The PL changes with the increase of Cd2+ concentrations could be displayed as a visual color change on the smartphone. Further quantitative analysis could be carried out by the RGB value of the picture through the App in less than 1 min The ratio of R/G is linear to Cd2+ concentration in the range of 1–2000 μg l−1 with a low LOD of 0.057 μg l−1 (S/N). Compared with traditional analysis methods, the PL ratiometric method with PL E-eye is portable, rapid, visible and highly selective especially in discriminate Cd2+ from Zn2+.
研究领域:
环境科学
·
分析化学
·
纳米技术
·
光学传感
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FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Mengjun Wang,Linyu Nian,Jiaoyang Wu,Shujie Cheng,Zhiping Yang,Chongjiang Cao
The deterioration of postharvest fruits and vegetables caused by ethylene and microorganisms leads to global resource waste. Therefore, the development of multifunctional packaging materials that scavenge ethylene and inhibit microorganisms is essential to extend the shelf life of fruits and vegetables and minimize waste. Herein, the excellent photocatalytic performance of [email protected] nanoparticles (NPs) was incorporated into chitosan (CS) and sodium alginate (SA) matrix by layer-by-layer (LBL) assembly method to obtain CS/SA/ [email protected] nanocomposite films. These as-prepared films exhibited excellent antibacterial (antibacterial ratio >99%) and ethylene scavenging properties (scavenging ratio >40%) due to the synergistic effect between visible light-induced reactive oxygen species (ROS) and the higher specific surface area of ZIF-8. The extended shelf life of kiwifruit further confirmed the enhanced preservation performance of CS/SA/ [email protected] nanocomposite films. In addition, with the addition of [email protected] NPs, the color, and transparency of the films decreased, but the mechanical strength, thermal stability, hydrophobicity, and barrier properties were improved. In summary, the successful construction of ethylene scavenging and antibacterial films provides new ideas for the innovation of environmentally adaptive and functionalization of films.
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高影响因子
MICROCHEMICAL JOURNAL
·
2023
·
IF 4.8
Qian Wei,Yan Yan,Qingmei Ge,Mao Liu,Nan Jiang,Hang Cong,Jiang-Lin Zhao
A novel photoelectrochemical sensor was constructed by ternary layer-by-layer composites of reduced graphene oxide (rGO), graphitic carbon nitride quantum dots (g-C 3 N 4 QDs), and hemicucurbit[12]uril (HemiQ[12]), on the Indium-Tin Oxide (ITO) piece in sequence. Electrochemical Impedance Spectroscopy (EIS) was employed to confirm the successful assembly of the sandwich electrode, and the functionalization of each layer was explored by comparing of the currents with stepwise coating of the materials to achieve the synergistic enhancement of photoelectrochemical intensity. The application of proposed electrode was achieved by ultrasensitive sensing for chloramphenicol (CAP), which provided a limit of detection low to 0.089 nM, with high selectivity, good reproducibility and stability. The acceptable recoveries for the determination of CAP in real samples of honey and milk illustrated the feasibility of the established analytical method.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Hao Xu,Jian Yang,Yang Li,Fan Fu,Kang Da,Shaobo Cao,Wenting Chen,Ximei Fan
Weak visible-light capture ability, ultrahigh charge recombination rate, and poor redox ability are crucial constraints to improve the photocatalytic performance for toluene degradation under visible-light. Hence, a dual Z-scheme of Bi 2 O 3 quantum dots decorated TiO 2 /BiOBr photocatalysts (Bi 2 O 3 QDs@TiO 2 /BiOBr) were prepared by a two-step hydrothermal method . X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM) were performed to identify the existence of Bi 2 O 3 QDs and TiO 2 that loaded on the surface of BiOBr. The introducing of oxygen vacancies in TiO 2 broadened its light absorption region to the visible-light. The constitutes of Bi 2 O 3 QDs and BiOBr were regulated and the optimized photocatalyst BT1-B10 exhibited 94.1 % of removal rate for gaseous toluene degradation after 150 min irradiation of visible-light (>420 nm) as well as good recoverability and durability. This result was obviously superior to other comparison samples. In-situ DRIFTs spectra and Gas Chromatography-Mass Spectrometry (GC-MS) were carried out to provide a possible pathway for the toluene degradation. Additionally, a dual-channel electron transfer model based on the Z-scheme was proposed, which presented desirable visible-light response region, efficient charge separation efficiency, and enhanced redox ability. Notably, hydroxyl radicals (•OH) served as the dominant active species was confirmed by electron spin resonance (ESR) and gas-phase capture tests, that was beneficial to the ring-opening of toluene degradation. This dual Z-scheme heterojunction of Bi 2 O 3 QDs@TiO 2 /BiOBr photocatalyst showed great potential for the degradation of toluene under visible-light irradiation.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Zelong Zhang,Linli Shen,Huiling Zhang,Ling Ding,Guangzhan Shao,Xiaojuan Liang,Weidong Xiang
Currently, the application of all-inorganic cesium lead halide perovskite (CsPbX 3 , X = Cl, Br, I) quantum dots (QDs) is limited due to toxicity of lead and poor ambient stability. In our work, a series of Ti-doped CsPbI 3 QDs were successfully prepared in borosilicate glass (SiO 2 -B 2 O 3 -ZnO) by the melt quenching and in situ crystallization technique. The samples showed excellent water/thermal stability, and the tunable emission (650–695 nm) was controlled by different Ti contents and heat treatment temperatures. In particular, the optical properties of CsPb 1− x Ti x I 3 QDs@glasses (x ≤ 0.5) are superior to those of pristine CsPbI 3 QDs@glass. As a result, the wLED was assembled using red-emitting CsPb 1− x Ti x I 3 QDs@glasses and yellow-emitting Ce 3+ :YAG phosphor under excitation of InGaN blue chip, which demonstrated an outstanding luminous efficiency of 102.44 lm/W, a high color rendering index of 80.6. Particularly, Ti-doped CsPbI 3 QDs@glasses with red and far-red light are combined with a blue-chip to assemble an LED device, which exactly satisfies the lighting conditions of plant growth.
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高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 2
·1-9
·
IF 6.408
Ma Xiangyu,Ma Yuheng,Ejeromedoghene Onome,Kandawa-Schulz Martha,Song Wei,Wang Yihong
An ultrasensitive photochemical biosensor based on the target miRNA-triggered catalytic hairpin assembly (CHA) reaction between Au nanoparticles (AuNPs)/C 3 N 4 nanosheets and CdS quantum dots (QDs) was developed for the determination of miRNAs. Firstly, AuNPs/C 3 N 4 nanosheets were immobilized onto a working glassy carbon electrode. Then, the hairpin probe 1 (H1) was loaded through Au–S bonding. Afterward, the unbound sites were blocked with 6-mercaptohexanol to avoid nonspecific adsorption. In the presence of the target miRNA, the CHA reaction between the H1 and hairpin probe 2-CdS QDs (H2-CdS QDs) could be triggered. As a result, the AuNPs/C 3 N 4 nanosheet and CdS QDs were linked by the double helix structure H1-H2. Unlike the other CHA reactions, H2 used in this work is longer than H1 so that the AuNPs/C 3 N 4 nanosheets could touch the CdS QDs. Given the matched energy band positions between the C 3 N 4 nanosheet and CdS QDs, a strong photocurrent could be obtained after the CHA reaction was triggered by the target miRNA. In addition, p-type C 3 N 4 nanosheets and n-type CdS QDs presented reduction photocurrents and oxidation photocurrents, respectively. Therefore, the photocurrents were vectors in this design that can eliminate the interference of nonspecific adsorption and avoid the generation of false-positive signals. Under the optimal conditions, the limit of detection was 92 aM. The constructed photoelectrochemical biosensor showed good reproducibility and selectivity in the analysis of serum samples, which indicates its great prospects in disease diagnostics and bioanalysis. Graphical abstract
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高影响因子
危险品化学品经营许可证（带存储）