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Unique 1D Cd <sub/>1?</sub><i> <sub/>x</sub></i> Zn <i> <sub/>x</sub></i> S@O-MoS <sub/>2</sub> /NiO <i> <sub/>x</sub></i> Nanohybrids: Highly Efficient Visible-Light-Driven Photocatalytic Hydrogen Evolution via Integrated Structural Regulation
摘要： Development of noble-metal-free photocatalysts for highly efficient sunlight-driven water splitting is of great interest. Nevertheless, for the photocatalytic H2 evolution reaction (HER), the integrated regulation study on morphology, electronic band structures, and surface active sites of catalyst is still minimal up to now. Herein, well-defined 1D Cd1?xZnxS@O-MoS2/NiOx hybrid nanostructures with enhanced activity and stability for photocatalytic HER are prepared. Interestingly, the band alignments, exposure of active sites, and interfacial charge separation of Cd1?xZnxS@O-MoS2/NiOx are optimized by tuning the Zn-doping content as well as the growth of defect-rich O-MoS2 layer and NiOx nanoparticles, which endow the hybrids with excellent HER performances. Specifically, the visible-light-driven (>420 nm) HER activity of Cd1?xZnxS@O-MoS2/NiOx with 15% Zn-doping and 0.2 wt% O-MoS2 (CZ0.15S-0.2M-NiOx) in lactic acid solution (66.08 mmol h?1 g?1) is about 25 times that of Pt loaded CZ0.15S, which is further increased to 223.17 mmol h?1 g?1 when using Na2S/Na2SO3 as the sacrificial agent. Meanwhile, in Na2S/Na2SO3 solution, the CZ0.15S-0.2M-NiOx sample demonstrates an apparent quantum yield of 64.1% at 420 nm and a good stability for HER under long-time illumination. The results presented in this work can be valuable inspirations for the exploitation of advanced materials for energy-related applications.
关键词： charge separation,1D hybrid nanostructures,photocatalytic hydrogen evolution,band alignments,active sites
更新于2025-09-23 15:22:29
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Formation of the AuNPs GO@MoS2/AuNPs Nanostructures for the SERS Application
摘要： GO nanomeshes and GO@MoS2/AuNPs nanostructures are formed on the flexible 3D Ni foam substrate for the SERS application. Smaller and denser AuNPs “hot spots” are spin-coated on such mesh-like GO@MoS2/AuNPs nanostructures to form AuNPs/GO@MoS2/AuNPs SERS substrates. The branches of GO nanomeshes are used as the homogeneous nanogaps to form the separated denser “hot spots” and absorb the molecules, resulting high electromagnetic (confirmed by the FDTD simulation) and signals enhancement. As low as 10-14 M of the Crystal Violet (CV) and Rhodamine 6G (R6G) are detected. Such flexible foam-like substrate can be used for the in-situ detection on the fish surface by scraping. DNA without label can also be easily detected by spin-coating the mixed AuNPs-DNA solution in our experiment.
关键词： AuNPs GO@MoS2/AuNPs；hybrid nanostructures；homogeneous nanogaps；SERS
更新于2025-09-23 15:21:21
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High adsorptivity and visible light assisted photocatalytic activity of silver/reduced graphene oxide (Ag/rGO) nanocomposite for wastewater treatment
摘要： The present study entails a simple chemical method for the preparation of high-quality silver / reduced graphene oxide (Ag/rGO) nanocomposite. Ag/rGO nanocomposite was characterized using UV–Visible spectroscopy, High Resolution Transmission Spectroscopy (HR-TEM), Scanning Electron Microscopy (SEM), Atomic Force Microscopy (AFM), Brunauer–Emmett–Teller (BET) analysis and X-ray Diffraction spectroscopy (XRD). SEM results showed the Silver (Ag) nanoparticles were deposited on graphene oxide (GO) nanosheets. XRD results confirmed the crystalline structure of Ag/rGO nanocomposite. The photocatalytic activity and stability of Ag/rGO nanocomposite for the degradation of methyl orange (MeO) dye was significantly increased in comparison to GO nanosheets under visible light. The adsorption capacity of Total Dissolved Solids (TDS) by Ag/rGO nanocomposite and GO nanosheets were further studied by utilizing wastewater as sample. The adsorption isothermal and kinetic studies suggest that 0.4 g/L Ag/rGO nanocomposite produce optimum separation capacity. Therefore, considering the excellent photocatalytic activity and adsorptivity nature of Ag/rGO nanocomposite, the present investigation can be effective in energy and environment related application.
关键词： Nanostructures,Adsorption,Photocatalysis,Total dissolved solids
更新于2025-09-23 15:21:21
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A Review on Optical Imaging of DNA Nanostructures and Dynamic Processes
摘要： This article reviews recent advances in optical imaging methods for characterizing self-assembled DNA nanosystems, with particular emphasis on super-resolved fluorescence microscopy. Several advanced strategies are developed to obtain accurate and detailed images of intricate DNA nanogeometries and to perform precise tracking of molecular motions in dynamic processes. We present state-of-the-art instruments and imaging strategies including localization microscopy and spectral imaging. We discuss how they are used in biological studies and biomedical applications, and also provide current challenges and future outlook. Overall, this review serves as a practical guide in optical microscopy for the field of DNA nanotechnology.
关键词： super-resolution microscopy,fluorescence microscopy,optical imaging,DNA nanostructures,DNA nanotechnology
更新于2025-09-23 15:21:21
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Preparing Semiconducting Nanoribbons with Tunable Length and Width via Crystallization-Driven Self-Assembly of a Simple Conjugated Homopolymer
摘要： Precise control of width and length of one-dimensional (1D) semiconducting nanostructures has attracted much attention owing to its potential for optoelectronic applications. However, regulating both their length and width using conjugated polymers or even block copolymers is a huge challenge. To solve this problem, we synthesized a unique conjugated polyacetylene homopolymer by living cyclopolymerization, which spontaneously formed 1D nanoribbons via in situ nanoparticlization. Interestingly, their widths could be controlled from 8 to 41 nm, which were directly proportional to their degree of polymerization. Furthermore, a self-seeding technique via crystallization-driven self-assembly (CDSA) was used to control the length of the nanoribbons up to 5.2 μm with narrow distributions less than 1.1. Interestingly, adding a block copolymer unimer to these nanoribbons produced triblock comicelles by the living CDSA mechanism. Finally, these nanoribbons were visualized directly by super-resolution optical fluorescence microscopy. Now, one can modulate both length and width of 1D nanoribbons simultaneously.
关键词： semiconducting nanostructures,crystallization-driven self-assembly,nanoribbons,optoelectronic applications,conjugated polymers
更新于2025-09-23 15:21:21
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[IEEE 2018 International Conference on Optical MEMS and Nanophotonics (OMN) - Lausanne (2018.7.29-2018.8.2)] 2018 International Conference on Optical MEMS and Nanophotonics (OMN) - Nanofabricated Infrared Polarization and Color Filters for Cloud Thermodynamic Phase Determination
摘要： Polarization and wavelength filters for the short-wave infrared based on metal-coated subwavelength-period silicon gratings are designed and fabricated. The nanostructure-based approach enables the realization of the desired polarization and wavelength selectivity for each filter element while also facilitating the integration of these elements into an array with varying polarizer orientation and passband center wavelength. These filters are optimized for a polarimetric imaging application in atmospheric science, namely, the discrimination of cloud thermodynamic phase (ice/water composition). Preliminary results support the viability of this approach.
关键词： wire-grid polarizer,polarization,atmospheric science,optical nanostructures,polarimetry,form-birefringence
更新于2025-09-23 15:21:21
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Effect of pH Values on the Structural, Optical and Electrical Properties of SnO2 Nanostructures
摘要： In the present work, we have synthesized the SnO2 nanostructures via precipitation method under optimal conditions at different pH values (3, 7 and 11) and studied the effect of different pH values on the structural, optical and electrical properties. The prepared samples are characterized by XRD, FESEM, TEM, PL, UV–Visible, FTIR spectroscopy and EIS measurements. XRD analysis reveals the tetragonal crystal structure for the prepared SnO2 nanostructures. TEM images show that the morphology of SnO2 nanostructures changed from spherical to hexagonal as pH values increased from 3 to 11. The deconvoluted PL spectra show various defects present in the synthesized samples that act as luminescent centers. The absorption spectra revealed that the maximum optical band-gap is obtained for SnO2 nanostructures synthesized using acidic solutions. The FTIR spectrum verifies the presence of stretching vibration mode of O-Sn-O bond and, stretching and bending bonds of O-H bonds in the prepared samples. A detailed exploration on frequency and temperature dependent impedance properties of SnO2 nanostructures has been done with the change in pH values.
关键词： Impedance spectroscopy,SnO2,PL,TEM,pH values,Nanostructures,FESEM
更新于2025-09-23 15:21:21
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Investigation of photocatalytic, electrochemical, optical and magnetic behaviors of rare-earth double perovskites using combustion synthesized Gd2NiMnO6 nanostructures in the presence of different saccharides
摘要： This paper reports combustion synthesis of Gd2NiMnO6 nanostructures (GNMO NSs), for the ?rst time, through reaction between metal nitrates in the presence of different saccharides, as capping and reducing agents. Analysis of XRD, FT-IR, EDS, along with TEM and SEM images and also VSM and DRS spectra were applied to study the NSs. The VSM showed an antiferromagnetic behavior. The DRS spectroscopy ascertained semiconducting behavior of GNMO NSs with Eg ? 3.05 eV for optimum sample prepared in the presence of glucose at 1000 (cid:2)C. The CV was used to investigation of electrochemical property of the NSs. For the ?rst time, the photocatalytic behavior of the GNMO NSs was evaluated, using the degradation of organic dyes under UV irradiation. The photodegradation of EDT was almost similar to that of ES, except for initial times of the irradiation. The degradation percentage of EBT and ES in the presence of GNMO NSs was large, whereas that of MV was little in the time range.
关键词： Direct band gap,Photocatalysis,Antiferromagnetism,Gd2NiMnO6,Combustion,Nanostructures
更新于2025-09-23 15:21:21
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Roll-to-roll fabrication of touch-responsive cellulose photonic laminates
摘要： Hydroxypropyl-cellulose (HPC), a derivative of naturally abundant cellulose, can self-assemble into helical nanostructures that lead to striking colouration from Bragg reflections. The helical periodicity is very sensitive to pressure, rendering HPC a responsive photonic material. Recent advances in elucidating these HPC mechano-chromic properties have so-far delivered few real-world applications, which require both up-scaling fabrication and digital translation of their colour changes. Here we present roll-to-roll manufactured metre-scale HPC laminates using continuous coating and encapsulation. We quantify the pressure response of the encapsulated HPC using optical analyses of the pressure-induced hue change as perceived by the human eye and digital imaging. Finally, we show the ability to capture real-time pressure distributions and temporal evolution of a human foot-print on our HPC laminates. This is the first demonstration of a large area and cost-effective method for fabricating HPC stimuli-responsive photonic films, which can generate pressure maps that can be read out with standard cameras.
关键词： mechano-chromic,Hydroxypropyl-cellulose,pressure mapping,self-assemble,photonic laminates,Bragg reflections,roll-to-roll fabrication,helical nanostructures
更新于2025-09-23 15:21:21
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The optical response of self-organized Ag-CdTe metal-semiconductor hybrid nanostructures: Change in interaction vs number density variation
摘要： Using experimental results and a theoretical model, we establish a relation for the optical response of a mixed nanocolloid. We show that colloids prepared by mixing metal and semiconductor nanocolloids in various ratios result in a mixture composed of a particular metal-semiconductor hybrid nanostructure and unattached original particles. Thus, the properties of hybrid samples prepared by such self-organized growth are decided by the variation in number density of the hybrid and the unattached particles and not due to a continuous change in the interaction between metal nanoparticles and semiconductor quantum dots as was assumed earlier. Using these results, a method to prepare a single type of hybrid nanostructure by measuring only its optical response is presented.
关键词： nanoparticles,metal-semiconductor hybrid nanostructures,optical response,quantum dots,self-organized growth
更新于2025-09-23 15:21:21