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Electrochemiluminescence resonance energy transfer system between non-toxic SnS2 quantum dots and ultrathin Ag@Au nanosheets for chloramphenicol detection
摘要： Herein, an efficient electrochemiluminescence energy resonance transfer (ECL-RET) system was first applied in an immunosensor for the detection of chloramphenicol (CAP). SnS2 quantum dots (SnS2 QDs) has an extremely narrow electrochemical emission spectrum, which was used as donor. Compared with conventional quantum dots, toxic-element-free SnS2 QDs exhibit superior environmental friendliness and biocompatibility. Ultrathin Ag@Au nanosheets (Ag@Au NSs) was selected as acceptor due to its excellent structure and controllable UV-vis absorption range. Furthermore, ZnO nanoflowers (ZnO NFs) was employed to modify the electrode surface to provide stable luminescent environment and support more SnS2 QDs. Taking these advantages, the absorption spectra of Ag@Au NSs and the ECL emission spectra of SnS2 QDs are highly matched which ensures the occurrence of ECL-RET. When the CAP analyte were absent, Ag@Au NSs was immobilized on the electrode, and its ultrathin thickness effectively shortens the path of ECL-RET to produce the weak ECL intensity. Inversely, CAP analyte would compete with coating antigen for the certain amount of antibody to remove excess Ag@Au NSs and cause relatively high ECL intensity. As a result, the proposed immunosensor performed satisfactory sensitivity with a wide linear range from 0.005 to 1000 ng mL?1 and a low detection limit (1.7 pg mL?1).
关键词： Chloramphenicol,Electrochemiluminescence energy resonance transfer,Ag@Au nanosheets,SnS2 quantum dots,Immunosensor
更新于2025-09-12 10:27:22
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Architecturing CoTiO3 overlayer on nanosheets-assembled hierarchical TiO2 nanospheres as a highly active and robust catalyst for peroxymonosulfate activation and metronidazole degradation
摘要： Catalytic performance of a heterogeneous cobalt-based catalyst for advanced oxidative process (AOP) correlates tightly with its structure and composition. The main objective of this study is to maximize the utilization and accessibility of cobalt sites while enhancing their activity and stability through rational structural and composition designs, and thus to achieve an excellent performance for heterogeneous peroxymonosulfate (PMS) activation. To this end, a novel CoTiO3/TiO2 composite (CTT), composed of CoTiO3 overlayer on nanosheets-assembled hierarchical TiO2 nanospheres, was elaborately designed and synthesized. The resulting CTT possessed certain features including CoTiO3-rich surface, large surface area (114.8 m2 g?1), and highly open porous channels, which afforded sufficient accessible active sites against undesirable particle agglomeration and shedding. Moreover, cobalt sites of CTT exhibited a higher activity toward PMS than those of Co3O4 due to the composition-induced distinct adsorption nature, easy electron transfer, and strong bond-weakening ability. Benefitting from the unique combination of structural and compositional advantages, CTT manifested remarkable catalytic efficiency, low cobalt leaching (0.078 mg L?1), and excellent reusability in activation of PMS for degradation of the emerging antibiotic pollutant metronidazole (MNZ). The potential degradation pathway for MNZ and the catalytic mechanism were further elucidated. The design strategy proposed in this study may provide a new opportunity for future development of high-performance heterogeneous cobalt-based catalysts in remediation of aquatic environment.
关键词： Heterogeneous cobalt-based catalyst,CoTiO3-rich surface,Metronidazole,Peroxymonosulfate activation,Catalytic degradation,Nanosheets-assembled hierarchical structure
更新于2025-09-12 10:27:22
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Charge transfer improvement of ZnO-based dye-sensitized solar cells modified with graphite nanosheets and bilayer photoelectrode structures
摘要： In this work, dye-sensitized solar cells (DSSCs) were fabricated with different photoelectrode structures consisting of a ZnO-based photoelectrode, a ZnO/Au Schottky barrier-based photoelectrode, graphite nanosheets loaded on a ZnO (GZnO)-based photoelectrode, graphite nanosheets loaded on a ZnO nanoparticles (GZnO NPs)-based photoelectrode and graphite nanosheets loaded on a ZnO nanoparticles/ZnO (GZnO NPs/ZnO) as a bilayer-based photoelectrode. The photovoltaic characteristics of DSSCs were investigated based on: the power conversion efficiency (PCE), short-circuit current density (Jsc), open-circuit voltage and fill factor. The kinetics electron transport of impedance spectros- DSSCs was carried out using electrochemical copy (EIS). The semi-circle in the Nyquist plot was calculated to rep- resent the charge transfer resistance (Rct). It was found that the GZnO NPs/ZnO bilayer-based photoelectrode exhibited the max- imum Jsc (9.185 mA/cm2) and maximum PCE (2.37%), which resulted by the minimum Rct in the device. The result can be interpreted as showing that a graphite nanosheet structure improves the electron transport property which produces an excellent charge transfer mechanism in the photoelectrode. Accordingly, enhanced perform- ance of ZnO-based dye-sensitized solar cells with graphite nano- sheets loaded on a ZnO nanoparticles layer could be simply explained in terms of the charge transfer mechanism.
关键词： graphite nanosheets,ZnO,dye-sensitized solar cells,charge transport
更新于2025-09-12 10:27:22
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Cerenkov Luminescence-Induced NO Release from 32P-Labeled ZnFe(CN)5NO Nanosheets to Enhance Radioisotope-Immunotherapy
摘要： The combination of radiotherapy with immunotherapy has emerged as a promising combinational therapeutic methodology. The efficacies of both types of therapies, however, are hampered by the abnormal tumor microenvironment (TME) with hypoxic and immunosuppressive features. Herein, we discover that by mixing zinc ions with sodium nitroprusside, a clinical anti-hypertensive drug, ZnFe(CN)5NO single-layer nanosheets can be obtained. Interestingly, after being labeled with 32P by simple mixing, the 32P-induced Cerenkov luminescence stimulated persistent release of NO from nanosheets. Owing to the modulation of hypoxic immunosuppressive TME by NO, such 32P-labeled nanosheets are able to completely eliminate local tumors after local administration, and proffer a strong abscopal effect after being combined with immune-checkpoint blockade therapy. Our work presents a unique 2D nanoplatform comprising Zn2+ and a clinical drug to enable chelator-free radiolabeling, Cerenkov luminescence-triggered NO release, effective TME modulation, and enhanced combination radioisotope-immunotherapy are promising for tumor metastasis treatment.
关键词： radioisotope-immunotherapy,ZnFe(CN)5NO nanosheets,Cerenkov luminescence,tumor microenvironment,NO release
更新于2025-09-12 10:27:22
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Sponge-templated production of ultra-thin ZnO nanosheets for printed ultraviolet photodetectors
摘要： This paper describes a simple and convenient approach to synthesize large amounts of ZnO nanosheets, which are suitable for producing a key component, i.e., colloidal nanoink, of printed ultraviolet photodetectors. ZnO nanosheets are produced by atomic layer deposition, where a three-dimensional polymer sponge with a large specific surface area is used as the template. Systematic studies including scanning electron microscopy, X-ray diffraction, and transmission electron microscopy reveal that the synthesized ZnO nanosheets have a good crystalline quality and mechanical flexibility. After dispersing ZnO nanosheets in a solvent to form a stable and colloidal nanoink, an ultraviolet photodetector is demonstrated through the printing method. Such a printed ultraviolet photodetector that utilizes ZnO nanosheets as the functional materials exhibits a high responsivity of (cid:2)148 A/W and a response time of 19 s. Our present study may provide a practical method to produce large amounts of functional nanosheets for printing electronics, which paves the way for developing high-performance, low-cost, large-area printed, and flexible electronics.
关键词： atomic layer deposition,printing electronics,ultraviolet photodetectors,ZnO nanosheets
更新于2025-09-12 10:27:22
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A label-free fluorescent sensor based on silicon quantum dots–MnO <sub/>2</sub> nanosheets for the detection of α-glucosidase and its inhibitor
摘要： A label-free fluorescent sensor based on silicon quantum dots–MnO2 nanosheets for the detection of α-glucosidase and its inhibitor?. α-Glucosidase and its inhibitors play a key role in diagnosis and treatment of diabetes. In the present work, we established a facile, sensitive and selective fluorescence method based on silicon quantum dots (SiQDs) and MnO2 nanosheets for the determination of α-glucosidase and one of its inhibitors acarbose. The fluorescence of SiQDs was greatly quenched by MnO2 nanosheets due to the inner filter effect. α-Glucosidase could easily catalyze the hydrolysis of L-ascorbic acid-2-O-α-D-glucopyranosyl (AAG) to produce ascorbic acid (AA), which could reduce MnO2 nanosheets to Mn2+, resulting in dramatic recovery of the fluorescence of SiQDs. The proposed sensing platform could provide a good linear relationship between the fluorescence intensity of SiQDs and the concentration of α-glucosidase in the range of 0.02–2.5 U mL?1 with a detection limit of 0.007 U mL?1. In addition, the sensing platform could be used for α-glucosidase inhibition. Acarbose was one of the most common and typical inhibitors, and this sensing platform can be utilized to detect acarbose in the range of 1–1000 μM. The developed fluorescence method was successfully validated for the determination of α-glucosidase in human serum samples.
关键词： silicon quantum dots,acarbose,label-free fluorescent sensor,MnO2 nanosheets,α-glucosidase
更新于2025-09-12 10:27:22
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Large-Scale Growth of Ultrathin Low-Dimensional Perovskite Nanosheets for High-Detectivity Photodetectors
摘要： Low-dimensional organic-inorganic hybrid perovskites have demonstrated to be promising semiconductor materials due to their unique optoelectronic properties, however, the controllable growth of high-quality ultrathin 2D perovskites with large lateral dimension still faces great challenges. Herein, we report the controllable growth of large-scale ultrathin 2D (C6H5(CH2)3NH3)3Pb2I7 ((PPA)3Pb2I7) perovskite nanosheets (NSs) using a facile antisolvent-assisted crystallization approach under mild condition. As a result, the well-defined regular-shaped (PPA)3Pb2I7 NSs, with the largest lateral size over 100 micrometers, have been successfully synthesized, which is more than several ten times larger than that of other 2D perovskites NSs previously reported. Moreover, the thickness of the achieved 2D perovskite NSs can be well-tuned by altering the concentration of the precursor solution, with the smallest thickness down to ~4.7 nm. More importantly, the photodetectors based on the high-quality (PPA)3Pb2I7 perovskites exhibit fascinating performance, including an extremely low dark current (~1.5 pA), fast response/recovery rate (~850/780 μs) and high detectivity (~1.2×1010 Jones). This work provides a simple and promising strategy to controllably grow large-scale and ultrathin 2D perovskite NSs for low-cost and high-performance optoelectronic devices.
关键词： low-dimensional perovskite,antisolvent-assisted crystallization approach,large size,photodetectors,ultrathin,nanosheets
更新于2025-09-12 10:27:22
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Optimizing Graphene Content in NiSe/Graphene Nanohybrid Counter Electrode on Boosting Photovoltaic Performance of Dye-sensitized Solar Cells
摘要： Nickel selenide (NiSe) nanoparticles were grown onto different mass ratios of graphene nanosheets (GN) to get their corresponding NiSe/GNx (x= 0.25 to 1.00) nanohybrids by a facile in-situ hydrothermal process to integrate the advantages of high specific surface area of graphene and homogeneously immobilized catalytic sites of NiSe. The nanohybrid having the mass ratio of 1:0.50 (i.e., NiSe/GN0.50) exhibited a higher electrocatalytic activity and electrolyte diffusion. Thus, NiSe/GN0.50 exhibited an improved photo-conversion efficiency (PCE) of 12% (? = 8.62%) than the standard Pt (? = 7.68%) based dye-sensitized solar cell (DSSC). This improved PCE mainly originated from the catalytic ability of NiSe and the multiple interfacial electron transfer pathway of graphene, resulting in the enhanced charge transfer and fast tri-iodide reduction kinetics at the counter electrode/electrolyte interface. The results obtained from the cyclic voltammetry (CV), electrochemical AC-impedance (EIS) and Tafel polarization studies validated the synergistic effect of NiSe and GN and the high possibility of this nanohybrid as an efficient counter electrode (CE) for DSSC.
关键词： Photovoltaic performance,Counter electrode,Graphene nanosheets,Nickel selenide,Dye-sensitized solar cell
更新于2025-09-11 14:15:04
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Facile synthesis of tin monosulfide nanosheets via physical vapour deposition and their near-infrared photoresponse
摘要： Two-dimensional layered materials (TDLMs), such as tin sulfide (SnS2), have attracted significant attention due to their vast potential applications in the fields of electronics, optoelectronics, energy conversion, and storage. Tin monosulfide (SnS) is an intrinsic p-type semiconductor in the family of TDLMs. Further explorations of SnS requires the development of efficient synthesis techniques. Here, we report SnS nanosheets grown via a physical vapour deposition (PVD) approach. The morphology was characterized using Raman spectroscopy, scanning electron microscopy (SEM), and atomic force microscopy (AFM). These SnS nanosheets exhibit a square shape with a smooth surface having an average lateral size of 7 μm and a thickness of 12 nm. No impurities were observed in the SnS nanosheets. Furthermore, photodetectors based on such SnS nanosheets were fabricated. The results show that the as-grown SnS has an excellent photo-response performance for an 850-nm laser with a high responsivity of 1604 AW-1, an external quantum efficiency of 2.34 × 105% and a detectivity of 3.42 × 1011 jones, which are larger than those values reported for previous SnS-based photodetectors. Moreover, the rise and fall times are 7.6 and 29.9 ms, respectively. Our work provides a strategy to obtain high-purity and ultrathin SnS while indicating that SnS has a great potential in applications for near-infrared photodetectors.
关键词： near-infrared photoresponse,tin monosulfide,nanosheets,physical vapour deposition
更新于2025-09-11 14:15:04
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Design of arrayed-waveguide optical switch employing window function for crosstalk reduction
摘要： Nanosheets have thicknesses on the order of nanometers and planar dimensions in the micrometer range. Nanomaterials that are capable of converting reversibly between 2D nanosheets and 3D structures in response to specific triggers can enable construction of nanodevices. Supra-molecular lipid nanosheets and their triggered conversions to 3D structures including vesicles and cups are reported. They are produced from lipid vesicles upon addition of amphiphilic peptides and cationic copolymers that act as peptide chaperones. By regulation of the chaperoning activity of the copolymer, 2D to 3D conversions are reversibly triggered, allowing tuning of lipid bilayer structures and functionalities.
关键词： graft copolymers,amphiphilic peptides,2D–3D conversion,lipid nanosheets
更新于2025-09-11 14:15:04