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oe1(光电查) - 科学论文

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出版时间
  • 2019
研究主题
  • composite electrode
  • silver nanowire
  • reduced graphene oxide
  • zinc oxide
应用领域
  • Optoelectronic Information Materials and Devices
机构单位
  • China Jiliang University
  • Guangdong Poly-Optoelectronics Co.
351 条数据
?? 中文（中国） ▾

  • Investigations on Synthesis, Characterization and Humidity Sensing Properties of ZnO and ZnO-ZrO2 Composite Nanoparticles Prepared by Ultrasonic Assisted Wet Chemical Method

    摘要： In the present investigations, Zinc oxide (ZnO) and ZnO-ZrO2 composite nanoparticles were synthesized by ultrasonic assisted wet chemical method to investigate their structural, optical and humidity sensing properties. The synthesized nanoparticles were characterized by the techniques like X ray diffraction (XRD), UV-Vis absorption spectroscopy, Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). XRD and EDS were employed to confirm the phase formation and phase purity respectively. SEM micrographs showed that morphology of the parent compound ZnO is considerably changed with varying concentration of ZrO2. The optical absorption spectra showed that optical absorption of ZnO decreases with increase in ZrO2 content in the composite. The observed band gap values for ZnO and ZnO-ZrO2 composites were higher as compared to the bulk sample. The humidity sensing performance was substantiated for all the samples and the result of effect of concentration of ZrO2 in ZnO-ZrO2 composites on sensitivity, response and recovery time are discussed in detail.

    关键词： Zinc oxide,Composite nanoparticles,Zirconium dioxide,Ultrasonic,Humidity sensor

    更新于2025-09-23 15:22:29

  • Nanostructuring Strategies To Increase the Photoelectrochemical Water Splitting Activity of Silicon Photocathodes

    摘要： Photoelectrochemical water splitting is a promising route for sustainable hydrogen production. Herein, we demonstrate a photoelectrode motif that enables a nanostructured large-surface area electrocatalyst without requiring a nanostructured semiconductor surface with the goal of promoting electrocatalysis while minimizing surface recombination. We compare the photoelectrochemical H2 evolution activity of two silicon photocathode nanostructuring strategies: (1) direct nanostructuring of the silicon surface and (2) incorporation of nanostructured zinc oxide to increase the electrocatalyst surface area on planar silicon. We observed that silicon photocathodes that utilized nanostructured ZnO supports outperformed nanostructured silicon electrodes by ～50 mV at open circuit under 1 sun illumination and demonstrated comparable electrocatalytic activity.

    关键词： photocathodes,silicon nanowires,hydrogen evolution,molybdenum disulfide,zinc oxide nanowires,photoelectrochemical water splitting

    更新于2025-09-23 15:22:29

  • Visible light photocatalytic dye decomposition behaviour of solid state reaction grown Zn <sub/>2</sub> TiO <sub/>4</sub> nanoparticles

    摘要： In this investigation, visible photocatalytic dye decomposition is carried out with compound semiconductor nanoparticles of zinc orthotitanate (Zn2TiO4). These nanoparticles were grown by the solid state reaction method and characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy, photoluminescence study, and Brunauer–Emmett–Teller (BET) study. The BET surface area of the Zn2TiO4 nanoparticles was found to be 8.78 m2/g. The photocatalytic activity is carried out by using a 500 W halogen light source having a spectrum in the range of 450 to 860 nm and the reaction kinetics was found to be the pseudo first order. The reaction rate constant was found to be 0.069 min?1. Discussion is given on the possible mechanism of the observed visible photocatalytic dye decomposition activity. The cost of the material used is very low, so it could be very useful for visible photocatalytic dye decomposition.

    关键词： visible photocatalysis,zinc orthotitanate,solid state reaction,dye decomposition,nanoparticles

    更新于2025-09-23 15:22:29

  • An In-Depth Study on Electrical and Hydrogen Sensing Characteristics of ZnO Thin Film with Radio Frequency Sputtered Gold Schottky Contacts

    摘要： Electrical and hydrogen sensing characteristics of radio frequency sputtered Au/ZnO thin film Schottky diodes on n-silicon substrate have been investigated over a wide temperature range. Current-voltage characterizations of the device in the temperature range of 25°C to 200°C confirm its excellent rectifying property with forward to reverse current ratio of 1610 at an external bias of 5 V. Ideality factor in the range of 4.12 to 2.98 is obtained for Au/ZnO Schottky diode in the aforementioned temperature range, at atmospheric conditions. On exposing diode to hydrogen, a reduction in ideality factor is observed which makes thermionic emission more prominent. The proposed device has proven to be hydrogen sensitive, on account of the lateral shift observed in I ? V characteristics at different hydrogen concentrations (50 ppm-1000 ppm). Maximum barrier height variation of 99 meV and sensitivity of 144% have been observed at 1000 ppm hydrogen at 200°C. A Detailed perusal of the steady-state reaction kinetics of the sensor using I ? V characteristics affirmed that the atomistic hydrogen adsorption at Au/ZnO interface is accountable for the barrier height modulation. The studied sensor depicts remarkable performance for high-temperature detection.

    关键词： Hydrogen sensing,Zinc oxide (ZnO) thin film,Electrical characteristics,Schottky diode,Metal-semiconductor interface,Palladium catalyst

    更新于2025-09-23 15:22:29

  • Specific Features of the Molecular Structure of A New 3-(Benzo[d]Oxazole-2-Yl)- 1-(2-(1,3,3-Trimethylindoline-2-Ylidene) Ethylidene)Naphthalene-2(1H)-One Zinc Chloride Complex

    摘要： X-ray diffraction is used to determine the structure of a new 3-(benzo[d]oxazole-2-yl)-1-(2-(1,3,3-trimethylindoline-2-ylidene)ethylidene)naphthalene-2(1H)-one zinc chloride complex 1. It is demonstrated that the ligand molecule in complex 1 has a trans–trans–cis conformation in which the indoline nitrogen atom is oriented in the same direction as the chelate ring, which could promote an additional coordination with the complexing atom.

    关键词： 3-trimethylindoline-2-ylidene)ethylidene)naphthalene-2(1H)-one zinc chloride,3,3-(benzo[d]oxazole-2-yl)-1-(2-(1,spiropyrans,X-ray diffraction study

    更新于2025-09-23 15:22:29

  • Design and Mechanism of Embedding Specific Carbon Nanotubes in Sputtered Sandwiched InGaZnO Thin Film Transistors

    摘要： Amorphous indium gallium zinc oxide (a-IGZO) thin film transistors (TFTs) with high mobility are highly desirable to achieve high-speed operation in active-matrix displays and large-area sensors. Only a few works provided potential solutions. In this work, we have embedded carbon nanotubes (CNTs) into sputtered a-IGZO film to form a-IGZO/CNT/a-IGZO (ACA) sandwiched channel. In the ACA channel, the CNT percolation networks connected by the a-IGZO film work as high-speed carrier paths to enable faster transport of carriers during the on state while it does not degrade the leakage performance during the off state. The type and the embedding location of the CNT percolation network are critical to determine the ACA device performance, which is analyzed and verified by experiment and simulation. The optimum ACA design has approximately doubled the mobility and the on current density of the TFT. The design owns relatively better uniformity and provides a high-speed TFT solution for the advanced electronics.

    关键词： mobility,amorphous indium gallium zinc oxide,carbon nanotube,thin film transistor,sandwiched structure

    更新于2025-09-23 15:22:29

  • Synthesis, Crystal Structure and Fluorescent Properties of Dinuclear Zinc Complex

    摘要： A dinuclear zinc complex [Zn2(qnal)2(CH3COO)2] (Hqnal: N-(8'-quinolyl)-2-hydroxy-1-naphthaldimine) was synthesized and characterized by X-ray crystallography. The complex crystallizes in monoclinic system, space group C2/c with a = 40.00(3), b = 7.690(5), c = 27.492(16) ?, β = 120.446(11)°, V = 17290(8) ?3, Z = 8. Dc = 1.537 g/cm3, Mr = 843.48, F(000) = 3456, μ(MoKα) = 1.374 mm-1, S = 1.033, R = 0.0403 and wR = 0.1049 for 4454 observed reflections (I > 2σ(I)). It exhibits a 3D supramolecular architecture constructing by π-π stacking interactions between quinolyl and naphthyl rings and shows luminescent property in the yellow region.

    关键词： Zinc complex,Dinuclear,Fluorescence,Crystal structure

    更新于2025-09-23 15:22:29

  • P-1.3: The conductivity modulation of amorphous zinc tin oxide thin film by Ar plasma treatment

    摘要： We propose a method to form low-resistance amorphous zinc tin oxide thin film (a-ZTO) by Ar plasma. The results show that the Ar plasma treatment can effectively decrease the resistivity of the a-ZTO. The ZTO film treated with Ar plasma at suitable time and moderate operating power, exhibits a low sheet resistance of 2.3 kΩ/□. With the help of PECVD-SiOx coverage layer, the sheet resistance of Ar-plasma treated ZTO is enhanced and increases only one order of magnitude after annealing at 230 ℃. As a result, an optimized Ar plasma treatment for fabrication of low-resistance a-ZTO film is presented.

    关键词： amorphous zinc tin oxide,thermal stability,Ar plasma treatment,low-resistance

    更新于2025-09-23 15:22:29

  • Plasma-Assisted Chemical Vapor Synthesis of Aluminum-Doped Zinc Oxide Nanopowder and Synthesis of AZO Films for Optoelectronic Applications

    摘要： Transparent conducting oxide aluminum-doped zinc oxide (AZO) nanoparticles were synthesized by a plasma-assisted chemical vapor synthesis route using zinc nitrate and aluminum nitrate as the precursors. The injected precursors vaporized in the plasma flame, followed by vapor-phase reaction and subsequent quenching of the vaporized precursors, producing nanosized AZO powder. The amount of aluminum nitrate was varied to obtain samples with 2 at.%, 4 at.% and 8 at.% Al, designated as AZO1, AZO2 and AZO3, respectively. The XRD patterns of the AZO1 and AZO2 nanoparticles indicated the presence of a wurtzite structure without any alumina peaks except in the AZO3 sample, and scanning electron microscopy micrographs revealed spherical particles. The magnetization measurements revealed a ferromagnetic behavior at room temperature in the AZO1 sample, and the ferromagnetic order is decreased in the high field region with an increase in the Al doping amount. AZO thin films were deposited on glass substrates by spin-coating a dispersion of nanoparticles. All the AZO films had a hexagonal wurtzite structure and exhibited a c-axis preferred orientation perpendicular to the substrate. The Hall effect measurements yielded a minimum resistivity of 9.9 × 10?? Ω cm for the AZO2 film and optical transmission of 80% for both the AZO1 and AZO2 films. However, with 8 at.% Al in the AZO3 film, deterioration in crystallinity, electrical and optical properties were observed. Post-annealing of the AZO1 film in H2 atmosphere caused a significant decrease in resistivity from 1.2 × 10?3 Ω cm to 8.7 × 10?? Ω cm. The optical band gap energies of the AZO films were determined from the transmission spectra. The blue shift in the band gap from 3.2 eV to 3.28 eV, observed with an increase in Al doping, was interpreted by the Burstein–Moss effect. The photoluminescence spectra of the AZO films revealed a UV near-band edge emission and a green emission peak.

    关键词： Plasma,optoelectronics,doped-zinc oxide,chemical vapor synthesis

    更新于2025-09-23 15:22:29

  • Hyaluronic Acid-zinc Protoporphyrin Conjugates for Photodynamic Antitumor Therapy

    摘要： Zinc (II) protoporphyrin IX (ZnPP) strongly inhibits antioxidative enzyme heme oxygenase-1 (HO-1), and ZnPP generates reactive oxygen species (ROS) upon light irradiation. ZnPP can induce lethal oxidative stress in the tumor, when ZnPP is selectively delivered to the tumor followed by light irradiation. In this study, ZnPP was conjugated to hyaluronic acid (HA-ZnPP) for improving its solubility in aqueous media and tumor selective delivery of ZnPP by the enhanced permeability and retention (EPR) effect. Though photosensitizing activity of the HA-ZnPP was quenched in phosphate buffered saline, it was partially recovered by addition of lecithin. Similar to other polymer-conjugated ZnPP, cellular uptake of the HA-ZnPP was lower than that of the free ZnPP in HeLa cells. In tumor-bearing mice, plasma half-life of HA-ZnPP became longer than that of free ZnPP, and thus selective accumulation of the HA-ZnPP in the tumor by the EPR effect was observed. Combination of the HA-ZnPP and light irradiation potentially suppressed the tumor growth, approximately 60% tumor volume reduction was observed without apparent adverse effects at day 31 after the drug treatment. These data demonstrate that HA is a preferable carrier for ZnPP, and the HA-conjugated ZnPP is a promising antitumor agent for photodynamic therapy.

    关键词： Nanomedicine,EPR,Zinc protoporphyrin,Photodynamic therapy,Hyaluronic acid

    更新于2025-09-23 15:22:29