- 标题
- 摘要
- 关键词
- 实验方案
- 产品
过滤筛选
- 2020
- 2019
- 2018
- 2017
- 2016
- 2014
- atomic layer deposition
- Carbon dots
- charge transport
- cytotoxicity
- DFT
- NMR
- P3HT
- phosphors
- photoluminescence
- hydrothermal synthesis
- Nanomaterials and Technology
- Optoelectronic Information Materials and Devices
- Materials Science and Engineering
- Polymer Materials and Engineering
- Optoelectronic Information Science and Engineering
- Chemistry
- Mechanical Engineering
- Biomedical Engineering
- Pharmacy
- Intelligent Medical Engineering
- Chinese Academy of Sciences
- University of Jinan
- South China University of Technology
- Tianjin University
- Ecole Polytechnique Fédérale de Lausanne
- Beijing Technology and Business University
- Chongqing Medical University
- University of Science and Technology Beijing
- Shanghai Institute of Technology
- Zhejiang University
-
Polymeric iodobismuthates {[Bi <sub/>3</sub> I <sub/>10</sub> ]} and {[BiI <sub/>4</sub> ]} with N-heterocyclic cations: promising perovskite-like photoactive materials for electronic devices
摘要： A screening of the reactions between BiI3 and iodide salts of different N-alkylated heterocycles (pyridine, quinoline, isoquinoline) resulted in the preparation and structural characterization of six novel iodobismuthate complexes, including two compounds exhibiting an unprecedented {[Bi3I10]} polymeric moiety. It has been shown that the chemical composition and structure of the iodobismuthates significantly affect their optical and electronic properties. The narrowest band gaps (Eg) were revealed by {[Bi3I10]} iodobismuthates, while the compounds incorporating {[BiI4]} polymeric frameworks showed 0.2–0.3 eV wider Eg. GIXRD analysis evidenced that all three iodobismuthates investigated in thin films show mainly the horizontal (parallel to the substrate) orientation of the 1D polymeric Bi–I frameworks. Such arrangement blocks the charge transport in vertical direction (orthogonal to the substrate) since the conductive Bi–I chains are separated with insulating bulky organic cations. As a consequence, standard planar junction solar cells based on new iodobismuthates revealed low power conversion efficiencies approaching 0.12% only. However, strong in-plane photoconductivity observed for iodobismuthates enabled the fabrication of efficient planar photodetectors, which paves a way to the practical use of this exotic family of materials. Most importantly, the presented systematic study revealed the most general guidelines for future rational design of perovskite-like materials for emerging generation of environment-friendly perovskite photovoltaics emphasizing the importance of the isotropic charge transport in the films of 3D materials and achieving proper orientation of 1D and 2D frameworks with respect to the charge collecting electrodes in anisotropic low dimensional systems.
关键词： photodetectors,perovskite-like materials,iodobismuthates,structural characterization,charge transport,photovoltaics
更新于2025-09-19 17:15:36
-
Photocatalytic Activity of Titanium Oxide Nano-Networks Fabricated through Organogel Route Using L-Isoleucine-Based Gelator
摘要： Titanium oxide nano-networks, which have various crystal structures, were fabricated by the sol-gel polymerization in an organogel formed by L-isoleucine organogelator and their photocatalytic activities were evaluated by a methylene blue method. The TiO2 nano-networks were formed by which the self-assembled nanofibers of the gelator acted as a template, and their crystal structure was controlled by the calcination temperature. The rutile TiO2 nano-network, which was fabricated at 700°C, showed a good photocatalytic activity.
更新于2025-09-19 17:15:36
-
Hierarchical WO3/ZnWO4 1D fibrous heterostructures with tunable in-situ growth of WO3 nanoparticles on surface for efficient low concentration HCHO detection
摘要： Hierarchical WO3/ZnWO4 1D fibrous heterostructures with tunable in-situ growth of WO3 nanoparticles on surface have been fabricated by the original one-step electrospinning technology combined with subsequent calcination process. Phase composition and morphology can be transformed from bead-like WO3 fibers to hierarchical WO3/ZnWO4 1D composites with the introduction of ZIF-8 into the precursor solution, which was mainly attributed to the combination of nucleation competition and crystal planes matching mechanisms during heat treatment. Compared with pure WO3 and WO3/ZnWO4-10%, WO3/ZnWO4-5% displayed the highest specific surface area value evaluated to be 268.57, indicating the prominent enhanced absorption behavior for targeted organic species. It is found that WO3/ZnWO4-5% composites have a response about 44.5 for 5 ppm HCHO, which was almost 8 times higher than that of sensor based on pure WO3 nanofibers at the optimal operating temperature. Meanwhile, the fast response/recovery time (12/14 s) and excellent stability characteristics (recycling, long-term, and humidity stability) towards HCHO can be also observed for WO3/ZnWO4-5% samples. The enhanced gas-sensing mechanism based on WO3/ZnWO4 composites can be ascribed to the synergistic effect of effective heterojunctions, large specific surface area, multiple reaction sites, and unique surface/interface electron transmission. The design and construction of hierarchical WO3/ZnWO4 1D materials attest to the significant potential of their use as novel gas sensors for detecting low concentration HCHO.
关键词： electrospinning,gas sensors,in-situ growth,HCHO,WO3/ZnWO4 heterostructures
更新于2025-09-19 17:15:36
-
Aging performance of nano-Zno modified polyurethane-acrylic UV ink composites on wood and the degradation mechanism
摘要： Nano-ZnO was applied to modify the yellow polyurethane-acrylic UV ink by physically blending and then the modified ink composites were used for wood printing. The color and gloss of the printed samples before and after aging were tested at periods. The aging mechanism of the ink composites was investigated was analyzed by XPS and FTIR analyses, and the morphologies were observed by AFM analysis. The results showed that the UV ink composite underwent oxidation during aging. Cromatism and gloss changed, and bulges existed on the surface in both untreated and nano-ZnO modified samples. However, the situation of the nano-ZnO modified UV ink composite printed samples after aging test was not as server as that printed with the unmodified one. During light aging, the primary amine, CO2, and carboxylic acid were yielded, and NH radicals were generated, which promoted the formation of conjugated structure and the chromogenic enamine. As expected, these reactions were inhibited by adding of nano-ZnO. Consequently, the light-resistant of the UV ink composite was improved. 1.0% nano-ZnO offered the lowest chromatism and the gloss changes among all, showing the best light-resistant performance.
更新于2025-09-19 17:15:36
-
Facile approach for the periodic poling of MgO-doped lithium niobate with liquid electrodes
摘要： The emerging quantum communication applications advance the rapid development of up-conversion single-photon detectors and entangled photon-pair sources, of which the core components are both based on frequency conversion in periodically poled lithium niobate (PPLN) waveguides. The MgO-doped congruent lithium niobate (Mg:LN) is known as the most promising material for the fabrication of PPLN because of its attractive properties, but the leakage current complicates the high-quality periodic poling of Mg:LN, especially for the technique with liquid electrodes. In this paper, we demonstrated an effective approach to suppress the leakage current by using SiO2 dielectric layer of appropriate thickness, and high-quality periodic poling has been realized in 5 mol.% Mg:LN wafers with the diameter of 76.2 mm based on the electric-field poling method using liquid electrodes. The ease of clear remove of the liquid electrodes benefits for the fabrication of waveguides on the wafer surface, and the wafer-level manufacture of PPMgLN with easy operation and high rate of finished products facilitates the mass production of PPMgLN devices for quantum communication applications.
关键词： liquid electrodes,leakage current,Mg:LN,periodic poling,SiO2 dielectric layer
更新于2025-09-19 17:15:36
-
Plasmonics of Au/Polymer Core/Shell Nanocomposites for Thermoresponsive Hybrid Metasurfaces
摘要： We investigate the temperature-dependent optical response of ordered lattices of non-interacting gold-core/poly(N-isopropylacrylamide)-shell nanoparticles (NPs), a system with proven photothermal and sensing capabilities. For the first time on this system, we exploited in situ Spectroscopic Ellipsometry (SE) to determine the complex, temperature-dependent optical properties of the lattice, a key piece of information which, however, is often overlooked. In doing so, we take full advantage of large-scale colloidal self-assembly, which makes NP lattices accessible to conventional SE. A quantitative interpretation of the SE data is obtained through an effective model based on the actual characteristics of the NPs and their dielectric environment. The model allows to estimate temperature-dependent morphological parameters, such as the distance between the gold cores and the substrate, also yielding the complex permittivity of the plasmonic NP lattice. Thus, by combining the high sensitivity of SE with proper modelling, we provide a comprehensive characterization of thermoresponsive NP lattices. The approach proposed here is instrumental to the analysis and design of functional hybrid metasurfaces with plasmonic functionalities, including particle-to-film coupled systems.
关键词： spectroscopic ellipsometry,PNIPAM,localized surface plasmon resonance,complex permittivity,core-shell particles
更新于2025-09-19 17:13:59
-
Highly efficient deep-red/near-infrared D-A chromophores based on naphthothiadiazole for OLEDs applications
摘要： Donor-acceptor (D-A) chromophores are an important class of deep-red/near-infrared (DR/NIR) materials. However, efficient D-A DR/NIR fluorescent emitters are rare due to the intrinsic charge-transfer excited-state. In this paper, two novel D-A-type DR/NIR fluorescent emitters with triphenylamine (TPA, donor), naphthothiadiazole (NZ, acceptor), pyrimidine (2TPA-NZN) and benzene (2TPA-BZN) as the π-bridge, are designed and synthesized. The photophysical study and theoretical analysis revealed that the emissive-state of the two materials has hybridized local and charge-transfer (HLCT) characters. This characteristic caused high photoluminescent quantum yield (PLQY) both in solution and doped film. The 2TPA-BZN with a more rigid molecular structure exhibits a lower non-radiative rate constant (knr), resulting in relatively higher PLQY as compared with the 2TPA-NZN. The doped organic light-emitting diodes (OLEDs) devices based on these materials demonstrated excellent maximum external quantum efficiency (EQEmax > 5.0 %) and the emission peak around 665 nm.
关键词： DR/NIR materials,OLEDs,HLCT,Naphthothiadiazole,D-A Chromophores
更新于2025-09-19 17:13:59
-
Biofabrication of size-controlled ZnO nanoparticles using various capping agents and their cytotoxic and antitermite activity
摘要： Herein, monodisperse Zinc oxide nanoparticles (ZnO-NPs) have been fabricated by green adeptness with and without using capping agents. The different capping agents used include Syzygium cumini leaves extract, starch and cetyl trimethyl ammonium bromide (CTAB). The UV/Vis analysis showed an exciton absorption band in the range of 370–385 nm for all NPs. The SEM analysis showed that average particle size of all ZnO NPs was consistent with that which was calculated by using the Debye-Scherrer equation also by using effective mass model approach. The XRD analysis has confirmed their crystalline nature and monodisperse size distribution. The Photoluminescence spectrum (PL) indicated the presence of surface defects on ZnO nanoparticles, which are the driving force in the efficient photocatalysis of brilliant green dye showing 89.33% degradation efficiency after 2 h. The plant-mediated ZnO NPs were an efficient antimicrobial agent against P. aeruginosa, E. coli, A.baumannii and K. pneumoniae strains; however, all including P. chrysogenum, A. niger, T. citrinoviride, A. fumigatus were resistant to ZnO NPs at all concentrations. Furthermore, they showed a strong antitermite activity against Heterotermes indicola workers and soldiers with a 100% mortality rate in 24 h.
关键词： antitermite activity,Photocatalysis,ZnO nanoparticles,cytotoxicity,capping agents
更新于2025-09-16 10:30:52
-
Nanoantenna Structure with Mid-Infrared Plasmonic Niobium-Doped Titanium Oxide
摘要： Among conductive oxide materials, niobium doped titanium dioxide has recently emerged as a stimulating and promising contestant for numerous applications. With carrier concentration tunability, high thermal stability, mechanical and environmental robustness, this is a material-of-choice for infrared plasmonics, which can substitute indium tin oxide (ITO). In this report, to illustrate great advantages of this material, we describe successful fabrication and characterization of niobium doped titanium oxide nanoantenna arrays aiming at surface-enhanced infrared absorption spectroscopy. The niobium doped titanium oxide film was deposited with co-sputtering method. Then the nanopatterned arrays were prepared by electron beam lithography combined with plasma etching and oxygen plasma ashing processes. The relative transmittance of the nanostrip and nanodisk antenna arrays was evaluated with Fourier transform infrared spectroscopy. Polarization dependence of surface plasmon resonances on incident light was examined confirming good agreements with calculations. Simulated spectra also present red-shift as length, width or diameter of the nanostructures increase, as predicted by classical antenna theory.
关键词： niobium-doped titanium oxide,mid-infrared plasmonics,nanoantenna
更新于2025-09-16 10:30:52
-
Controlled Hydrothermal Synthesis of K<sub>2</sub>Ti<sub>6</sub>O<sub>13</sub> Nanowires and their Photo-Electronic Response
摘要： A hydrothermal method using tetrabutyl titanate and KOH as reactants for synthesis of K2Ti6O13 nanowires was developed, obtaining nanowires with a uniform diameter around 10nm. It is shown that the hydrothermal temperature and the KOH concentration have little influence in tuning the growth of K2Ti6O13 nanowires. By changing the time for hydrothermal reaction, the length of K2Ti6O13 nanowires can be controlled from several dozen of nanometers to several hundreds of nanometers. The as-prepared K2Ti6O13 nanowires exhibit a wide and strong absorption band in the ultraviolet range (around 200~300 nm), and stable photocurrent of 0.5μA/cm2, which might suggest potential applications in solar cell and water splitting.
关键词： photo-electronic response,hydrothermal synthesis,K2Ti6O13 nanowires
更新于2025-09-16 10:30:52