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Optimization and performance of nitrogen-doped carbon dots as a color conversion layer for white-LED applications
摘要： In this study, green-emitting nitrogen-doped carbon dots (N-CDots) were synthesized and incorporated into drop-cast composite films for use as color conversion layers in a white-LED configuration to generate white light. In order to resolve the red deficiency of this configuration, a commercial red phosphor was integrated into the system. Moreover, the N-CDots were also processed into polymer/N-CDot composite fibers, for which we determined the amount of N-CDots that yielded adequate white-light properties. Finally, we showed that white light with excellent properties could be generated by employing both of the fabricated N-CDot composites either as drop-cast films or composite fibers. Hence, N-CDots provide a promising alternative to inorganic phosphors that are commonly employed in white-LED configurations.
关键词： PVP,nitrogen-doped carbon dots,color conversion layer,electrospinning,white-light generation,white LED,solid-state lighting
更新于2025-09-11 14:15:04
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A Novel CMUTs-based Resonant Biochemical Sensor Using Electrospinning Technology
摘要： A novel CMUTs-based resonant biochemical sensor was presented to detect SO2 with a sensitive polymer electrospinning technology. The electrospinning technology was proposed as an innovative functionalization method to fabricate nano reticular polymer fibers with the diameters of 50 nm~500 nm on the movable plates of the CMUTs. The surface topography of electrospun nanofibers and the impedance properties of functionalized CMUTs were characterized. The CMUTs-based resonant biochemical sensor was packaged to detect SO2 in the experiments. Its resonant frequency shifts varied against the variation of SO2 concentration. The influences of the mixed gas flow rate were also analyzed. These showed the proposed sensor had good volume sensitivity and frequency stability.
关键词： volume sensitivity,electrospinning technology,impedance characteristics,CMUTs-based resonant biochemical sensor,frequency shift
更新于2025-09-11 14:15:04
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Vertically-aligned lead-free BCTZY nanofibers with enhanced electrical properties for flexible piezoelectric nanogenerators
摘要： Flexible lead-free (Ba0.85Ca0.15)(Ti0.9Zr0.1)O3-0.2 mol%Y nano?bers (BCTZY NFs) were synthesized by electrospinning and their corresponding nanogenerators (NGs) with vertical alignments were fabricated. The low-temperature sintering properties of BCTZY NFs were investigated, to optimize their synthesis path and minimize the thermal energy consumption during the sintering process. The continuity, ?exibility, and stability of the BCTZ-based NFs were improved by adding Y3+. Moreover, the temperature-evolved Raman spectra displayed a high Curie temperature of 280 °C for BCTZY NFs, which was far higher than that of about 90 °C for BCTZ-based ceramic bulks, owing to the discontinuous physical property of NFs. The dielectric, ferroelectric, and piezoelectric properties of the vertically aligned BCTZY NFs/PDMS were estimated and compared with those of BCTZ NFs/PDMS composites, to verify the advantages of vertical alignments and the donor doping e?ect of Y3+. Vertically aligned BCTZY NF-based NGs showed an average VOC of 3.0 V and ISC of 85 nA by ?nger tapping, suggesting their potential applications in tiny energy harvesting.
关键词： Electrospinning,Lead-free BCTZY nano?bers,Vertical alignment,Piezoelectric nanogenerators
更新于2025-09-10 09:29:36
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Phototunable <i>Morpho</i> Butterfly Microstructures Modified by Liquid Crystal Polymers
摘要： The unique hierarchical microstructures of the Morpho butterfly wing (MBW) exhibit angle independent blue iridescence. Biomimicking these microstructures and turning them into functional photonic crystals (PhCs) have fascinated scientists yet remain challenging. Here, a phototunable PhC is fabricated by depositing the azobenzene-containing linear liquid crystal polymer (LLCP) onto the MBW template. Thanks to the excellent mechanical properties and deformability of LLCP, the generated 3D bilayer microstructures demonstrate hierarchical deformation upon UV light irradiation, leading to a blueshift of the reflection peak (70 nm) and a remarkable change of reflectance (40%). This phototunable PhC may have potential applications in pigments, cosmetics, and sensors.
关键词： electrospinning,liquid crystal polymers,Morpho butterfly wings,photonic crystals,photoresponsiveness
更新于2025-09-10 09:29:36
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Electrospinning Construction of Flexible Composite Nanoribbons with Color-Tunable Fluorescence
摘要： Herein, we describe the innovative one-dimensional nanomaterials, electrospun composite nanoribbons (width 10.119 ± 0.186 μm) containing complexes of Eu(TTA)3(TPPO)2 and Tb(BA)3phen in a matrix of polymethylmethacrylate (PMMA). Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS) and fluorescence spectroscopy were used to characterize the final products. The novel luminescent composite nanoribbons exhibit green, orange and red fluorescence emission peaks at 490, 545, 592, and 615 nm, which are ascribed to the 5D4 → 7F6 (490 nm) and 5D4 → 7F5 (545 nm) energy transitions of Tb3+ ions, and the 5D0 → 7F1 (592 nm), 5D0 → 7F2 (615 nm) transitions of Eu3+ ions, respectively. It is observed that the doping percentage and the chosen excitation wavelength could be used to tune the emission color of the samples. The color-tunable luminescent composite nanoribbons have potential applications in the fields of display panels, lasers and bioimaging.
关键词： fluorescence,electrospinning,composite nanoribbons,rare earth complexes,tunable color
更新于2025-09-10 09:29:36
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Electrospun Three-Dimensional Nanofibrous Structure via Probe Arrays Inducing
摘要： The fast and precise direct-printing of micro three-dimensional (3D) structures is the important development trend for micro/nano fabrication technique. A novel method with probe arrays was built up to realize the controllable deposition of 3D electrospun nanofibrous structures. Firstly, several 3D nanofibrous structures were built on a single probe and 2-, 3-probes, which indicated that the probe height and probe interval played a key role on the 3D structure morphology. Then, different stereo nanofibrous structures based on multiprobe arrays were achieved accurately and the effects of processing parameters, including the probe height, probe interval, applied voltage and flow rate on the deposition behaviors of electrospun nanofiber over the probe arrays were investigated. The deposition area of 3D electrospun nanofibrous structures decreased with the increase of probe interval, applied voltage, and flow rate. Several 3D nanofibrous structures of special shapes including convex, triangle wave, inverted cone and complex curved surface were demonstrated by controlling the configuration of probe arrays and electrospinning parameters. This work provides an effective and simple way for the construction of 3D electrospun nanofibrous structures, which has great potentials in various medical and industrial applications.
关键词： three-dimensional micro structures,nanofiber,electrospinning,probe arrays,induced electrical field
更新于2025-09-10 09:29:36
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Electrospinning 3D Nanofiber Structure of Polycaprolactone Incorporated with Silver Nanoparticles
摘要： This study presents a one-station 3D fabrication technique of nano?brous scaffold for tissue engineering. A divergence static electric ?eld was introduced in an electrospinning system to induce a self-assembly of aligned polycaprolactone (PCL) nano?bers into a tunable 3D architecture with thickness ranging from 2 to 12 mm. Silver nanoparticles were incorporated into the PCL solution to alter the electrical conductivity. Human ?broblast cells were cultured on the pure PCL nano?ber scaffolds in vitro for 7 days. It was found that the occurrence of nano?ber bridging phenomenon depended on the solution viscosity. The minimum viscosity to form a 3D nano?ber structure was higher than that to form a 2D nano?ber mat. The homogeneity of nano?ber distribution within the 3D space was positively correlated with the electrical conductivity and the weight of the nano?bers. In the cell culture test, ?broblasts proliferated on the scaffold and organized as an aligned matrix which mimicked the microstructure of native musculoskeletal tissues.
关键词： Tissue engineering,3D nano?ber structure,Electrospinning,Polycaprolactone,Silver nanoparticles
更新于2025-09-10 09:29:36
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hybride nanowire networks prepared by electrospinning
摘要： We prepared La1.85Sr0.15CuO4/La0.7Sr0.3MnO3 nanowire network hybrid systems by means of electrospinning. From obervation by scanning electron microscopy, the average diameter of the nanowires is around 220 nm and the average length can reach over 50 μm. The randomly aligned La1.85Sr0.15CuO4 and La0.7Sr0.3MnO3 nanowires exhibit numerous interconnects among each other and form a complicated, non woven hybrid network system. The nanowires are polycrystalline with a grain size at around 30 nm as con?rmed by transmission electron microscopy. According to four-probe electrical transportation and magnetization measurements, superconductivity of the sample is suppressed and a positive magnetoresistance e?ect is observed. Measurements of M(T ) and M(H) were carried out as well, revealing the soft magnetic character of the hybrid nanowire network samples.
关键词： LSCO,electrospinning,nanowires,LSMO,magnetization,magnetoresistance,hybrid network
更新于2025-09-10 09:29:36
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Optical oxygen sensors based on microfibers formed from fluorinated copolymers
摘要： Polymeric micro?bers, particularly the ?uorinated copolymers’ ?bers, are promising functional materials for photoelectric devices, sensing, and energy storage due to their various surface characteristics. However, to obtain the high ?uorine content copolymer-based ?bers with considerable uniformity is likely to be especially challenging, which seriously debilitates their applications in sensor devices. Herein, for the ?rst time, we presented a high ?uorine content platinum porphyrin-grafted poly(isobutyl methacrylate-co-dodeca?uoroheptyl methacrylate) copolymers (PtTFPP-p(IBM-co-DFHMA)) micro?brous thin-?lms used as optical oxygen sensors. The porous thin-?lm frameworks were formed of uniform micro?bers, which a?orded an exceptional improvement in sensitivity and exhibited 584% higher sensitivity than the solid sensing ?lm owing to the large speci?c surface area, porous structures and oxygen di?usion enhancement by ?uorine elements. Additionally, the remarkable emission intensity-changing characteristic of the micro?ber sensing ?lm under various air pressures facilitates convenient visualization of pressure distributions on ?lm surface. The characteristics are particularly important for the computational ?uid dynamics simulations in various sensing ?elds such as unsteady ?ow visualization and unsteady pressure measurements, etc. Owing to its attractive advantages and versatile performance, ?uorine-containing copolymers ?bers are expected to provide a new strategy for the rational design of high performance gas sensor devices.
关键词： PSP,Micro?ber,Fluorinated copolymers,Electrospinning,Oxygen sensor
更新于2025-09-10 09:29:36
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Photoelectrochemical water splitting properties of CdS/TiO2 nanofibers-based photoanode
摘要： CdS-sensitized TiO2 nanofibers (CdS/TiO2 NFs) structures were fabricated on the indium tin oxide (ITO) conducting substrate that acts as a working electrode in photoelectrochemical (PEC) cell for the generation of hydrogen by water splitting. TiO2 NFs on ITO conducting substrate were synthesized by electrospinning technique using Titanium tetraisopropoxide as the precursor, followed by a calcination process in air at 500 °C for 2 h. CdS deposition on TiO2 NFs structures was carried out by the dip coating method with different dipping times to optimize the water splitting efficiency. The morphologies and crystalline structures of fabricated samples were characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy, Raman spectroscopy and X-ray photoelectron spectroscopy. The PEC properties of the electrodes were measured using a potentiostat instrument in a mixture of 0.25 M Na2S and 0.35 M Na2SO3 aqueous solutions for CdS/TiO2 photoanodes and in 0.5 M Na2SO4 electrolyte for uncoated TiO2 photoanode under the illumination of simulated sunlight (100 mW/cm2 from 150 W xenon lamp). It was found that an optimized TiO2 NFs structure sensitized by CdS layer yields a photoconversion efficiency of 3.2% at 0.0 V (vs. Ag/AgCl). The value of photocurrent density for CdS/TiO2 NFs samples were more than 20 times higher than that of the uncoated TiO2 NFs sample at 0.0 V (vs. Ag/AgCl) under a simulated sunlight irradiation.
关键词： photoelectrochemical water splitting,electrospinning,dip coating,hydrogen generation,CdS/TiO2 nanofibers
更新于2025-09-10 09:29:36