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European Microscopy Congress 2016: Proceedings || A new method for quantitative XEDS tomography of complex hetero-nanostructures
摘要： Over the last decades, electron tomography (ET) of complex materials has evolved into a powerful tool to investigate the three-dimensional (3D) structure of materials at the nanometer scale. The technique is based on the acquisition of a series of two-dimensional (2D) projection images of a sample, which are then reconstructed into a 3D volume using computational methods. Despite its success, ET faces several challenges, including the missing wedge problem, which limits the resolution and fidelity of the reconstructed volume. In this paper, we present a novel approach to mitigate the missing wedge problem by combining ET with machine learning (ML). Our method leverages the ability of ML to learn from data and predict missing information, thereby improving the quality of the reconstructed volume. We demonstrate the effectiveness of our approach on a series of synthetic and experimental datasets, showing significant improvements in resolution and fidelity compared to traditional reconstruction methods.
关键词： machine learning,nanomaterials,3D reconstruction,missing wedge,electron tomography
更新于2025-09-09 09:28:46
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T?ng h?p v?t li?u CeO2 kích th??c nanomet trên n?n SiO2 và nghiên c?u kh? n?ng quang xúc tác c?a chúng
摘要： The nanomaterials CeO2 with average size of 50 nm on the SiO2 base which performed very high photocatalytic properties were successfully synthesized by the sol-gel combustion method. Starting with freshly precursor, the prepared sample was studied the morphology and characterized by X-ray diffraction, field-emission scanning electron microscopy and Brunauer-Emmetl-Teller method at 77 K. The nanocomposite material contained only 10 % and 20 % of CeO2, but it still presented a significant efficiency on methyl orange degradation under visible light. The CeSi20 which includes 20 % of CeO2 nanoparticles revealed that the photocatalytic capacity with over 97 % of methyl orange was removed after 60 min of the irradiation.
关键词： CeO2,Nanomaterials,photocatalytic,methyl orange degradation
更新于2025-09-09 09:28:46
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Preparation and Optical Property of Hierarchical Structured Porous ZnO Microplates
摘要： Hierarchical structured porous ZnO microplates have been prepared by thermal decomposition of Zn5(CO3)2(OH)6 precursor. The products are characterized by X-ray diffraction, field-emission scanning electron microscopy, high resolution transmission electron microscopy, transmission electron microscopy, UV-visible absorption spectrum and photoluminescence spectra. Each ZnO microplate is made up of nanoparticle-based nanowires with diameters of 40-80 nm and lengths of 2-3 μm and the diameter of constituent nanoparticles ranges from 10 to 20 nm. Due to their porous hierarchical microstructures, the prepared ZnO products exhibit excellent optical properties.
关键词： Zinc oxide,Porous microstructure,Optical property,Nanomaterials
更新于2025-09-09 09:28:46
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A comprehensive review on thin film-based nano-biosensor for uric acid determination: arthritis diagnosis
摘要： This article aims to provide a survey on the development of thin film-based nano-biosensor over the decade, which includes sensing principles, electrode types and various thin film matrices. The theoretical and experimental results suggest that the thin film-based sensor are suitable for highly sensitive detection of low concentration bio molecules and can be used for early diagnosis and screening of arthritis, kidney diseases and other cardiovascular diseases. This review concludes that enzyme immobilisation and surface functionalisation methods were used to increase sensitivity of the biosensor and new combination of polymer nano-composites with metal oxide thin films results in increased efficiency due to its high biocompatibility.
关键词： nanomaterials,enzymes,thin films,uric acid,immobilisation,biocompatibility
更新于2025-09-09 09:28:46
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Microalgae biochar-derived carbon dots and their application in heavy metal sensing in aqueous systems
摘要： This research seeks a coupled solution for managing the large amounts of biochar produced by microalgae biofuel production, and the necessity for novel, economic and accurate heavy metal sensing methods. Therefore, this study evaluated the transformation of microalgae biochar (MAB) into carbon dots (Cdots) and their subsequent application as heavy metal ion sensors in aqueous systems. The experimental phase included the transformation of MAB into microalgae biochar-derived carbon dots (MAB–Cdots), MAB–Cdot characterisation and the evaluation of the MAB–Cdots as transducers for the detection of four heavy metal ions (Pb2+, Cu2+, Cd2+, and Ni2+). MAB–Cdot fluorescence was stable over a wide range of pH and resistant to photo-bleaching, making them suitable as fluorescence probes. The MAB–Cdot fluorescence was quenched by all of the metal ions and displayed different quenching levels. Depending upon the ions involved, MAB–Cdots were used to detect the presence of heavy metal ions from concentrations of 0.012 μM up to 2 mM by measuring the reduction in fluorescence intensity. Neutral and slightly alkaline pHs were optimal for Cu2+ Ni2+ and Pb2+ heavy metal quenching. To quantify the concentration of the heavy metal ions, linear and logarithmic functions were used to model the MAB–Cdot fluorescence quenching. The sensing mechanism was determined to be reversible and purely collisional with some fluorophores less accessible than the others. This work demonstrated the ability to produce Cdots from microalgae biochar, examined their application as a transducer for detecting heavy metal ions in aqueous systems and paves the way for novel sensing systems using MAB-Cdots.
关键词： Heavy metal ion,Carbon dots,Renewable nanomaterials,Quenching,Biochar,Microalgae,Fluorescence sensors
更新于2025-09-09 09:28:46
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High-Throughput Template-Free Continuous Flow Synthesis of Polyaniline Nanofibers
摘要： The large-scale and high-throughput synthesis of conjugated polymer based nanofibers always remain a challenge for the chemists due to the issues related to secondary nucleation in traditional batch processes. Typically polyaniline (PANI) nanofibers are synthesized under highly dilute conditions resulting in a very low throughput of few hundred mg per hour and a low space-time yield (STY) of 1-2 g·L-1·h-1. In this manuscript, we report the continuous flow synthesis of PANI nanofibers which results in high throughput (17-30 g·h-1) and high space-time yield (140-450 g·L-1·h-1). These polyaniline nanofibers show high surface area (42 m2·g-1), high specific capacitance (577 F·g-1) and high crystallinity. Finally, the present method is generic in nature and, in principle, can be extended for the synthesis of nanofibers of other conjugated polymers via oxidative polymerization.
关键词： Chemical oxidative polymerization,One-dimensional nanomaterials,Polyaniline nanofiber,Space-time yield,Electrochemical capacitor,Throughput,Continuous flow synthesis
更新于2025-09-09 09:28:46
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[SpringerBriefs in Materials] Anisotropic Metal Chalcogenide Nanomaterials (Synthesis, Assembly, and Applications) || Introduction
摘要： Nanoscience and nanotechnology have been putting the size and shape-dependent characteristics of matters on the horizon. Due to this reason, huge efforts have been poured into ?nding parameters affecting the intrinsic properties of materials at nanometer scale. Other than the size effect, shapes of nanomaterials produce a class of materials in which their properties are variable with direction. The anisotropy in chemical and physical features created vigorous attention in a way to synthesize 1D and 2D nanomaterials. Especially, metal chalcogenide (MC), constituting a series of compound materials with its vast library on the periodic table, has been studied and demonstrated to exploit in numerous applications.
关键词： metal chalcogenide,anisotropic nanomaterials,nanotechnology,nanoscience,1D and 2D nanomaterials
更新于2025-09-04 15:30:14
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The Use of Copper Oxide Thin Films in Gas-Sensing Applications
摘要： In this work, the latest achievements in the field of copper oxide thin film gas sensors are presented and discussed. Several methods and deposition techniques are shown with their advantages and disadvantages for commercial applications. Recently, CuO thin film gas sensors have been studied to detect various compounds, such as: nitrogen oxides, carbon oxides, hydrogen sulfide, ammonia, as well as several volatile organic compounds in many different applications, e.g., agriculture. The CuO thin film gas sensors exhibited high 3-S parameters (sensitivity, selectivity, and stability). Furthermore, the possibility to function at room temperature with long-term stability was proven as well, which makes this material very attractive in gas-sensing applications, including exhaled breath analysis.
关键词： nanomaterials,gas sensors,exhaled acetone detection,diabetes
更新于2025-09-04 15:30:14
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Aluminum(III) triggered aggregation-induced emission of glutathione-capped copper nanoclusters as a fluorescent probe for creatinine
摘要： Glutathione-capped copper nanoclusters (CuNCs) are presented that display aggregation-induced emission (AIE). This feature was exploited for selective and sensitive quantification of creatinine (CRN) which is an important diagnostic parameter. In the presence of Al3+ ions, such CuNCs rapidly aggregate, and this induces enhanced a red emission. The AIE nature of CuNCs was proven via TEM and fluorimetry. On addition of CRN, the coordination between CRN and Al3+ ions led to the quenching of fluorescence due to weakening the AIE. The best fluorescence intensity was measured at excitation/emission peaks of 360/585 nm. Quenched fluorescence intensity showed a linear dependence on the concentrations of CRN in the range of 2.5–34 μgL?1 with a detection limit of 0.63 μgL?1. The sensing mechanism of probe for CRN detection is discussed. The probe was applied to the determination of CRN in spiked human serum samples and gave satisfactory results.
关键词： Nanosensor,Renal biomarker,Serum analysis,Fluorescent nanomaterials,Metal nanoclusters,Nanoprobe,Paired t-test,Fluorometry,Real sample analysis
更新于2025-09-04 15:30:14
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Atomic structure of a fluorescent Ag <sub/>8</sub> cluster templated by a multi-stranded DNA scaffold
摘要： Multinuclear silver clusters encapsulated by DNA exhibit size-tunable emission spectra and rich photophysics, but their atomic organization is poorly understood. Herein, we describe the structure of one such hybrid chromophore, a green-emitting Ag8 cluster arranged in a Big Dipper shape bound to the oligonucleotide A2C4. Three 3’ cytosine metallo-base pairs stabilize a parallel A-form-like duplex with a 5’ adenine-rich pocket, which binds a metallic, trapezoidal-shaped Ag5 moiety via Ag-N bonds to endo- and exo-cyclic nitrogens of cytosine and adenine. The unique DNA configuration, constrained coordination environment, and templated Ag8 cluster arrangement highlight the reciprocity between the silvers and DNA in adopting this structure. These first atomic details of a DNA-encapsulated Ag cluster fluorophore illuminate many aspects of biological assembly, nanoscience, and medical imaging.
关键词： crystallography,photophysics,silver,crystals,DNA,materials,nanocluster,nanomaterials,emissive cluster
更新于2025-09-04 15:30:14