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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
  • solar cell
  • thin film
  • sputtering
  • Tungsten di sulfide (WS2)
应用领域
  • Optoelectronic Information Materials and Devices
机构单位
  • Universiti Kebangsaan Malaysia
  • German Malaysian Institute
  • Universiti Tenaga Nasional
143 条数据
?? 中文（中国） ▾

  • Hyperthermia Induced by Near-Infrared Laser-Irradiated CsWO3 Nanoparticles Disintegrates Preformed Lysozyme Amyloid Fibrils

    摘要： This research study attempts to prove the concept of the applicability of hyperthermia to treating the lysozyme amyloid fibrils (LAF)’s self-assembled fibrillary aggregates by a feedback-modulated temperature controller ranging from 26 °C to 80 °C, and separately, by near-infrared (NIR) laser-irradiated cesium tungstate (CsWO3) nanoparticle (NPs). The dependence of the final morphology of the amyloidal assembly on external heating and the photothermal effect of the NPs on treating the fibrillary assembly were investigated and analyzed. Experimentally, atomic force microscopy (AFM), optical stereoscopy, and scanning electron microscopy (SEM) were used primarily to ensure mutual interaction between LAF and NPs, optically elucidate the surface contour and final fibrillary assembly upon the influence of thermal treatment, and further reveal fine-details of the optical samples. Finally, conclusive remarks are drawn that the fibrillary structures doped with the NPs exhibit an increasing degree of unique orthogonality. As the temperature rises, utter deformation of the dendritic structures of fibrillary assemblies at 70 °C was found, and NIR laser-irradiated CsWO3 NPs have been demonstrated to be useful in topically destructing pre-assembled LAFs, which may be conducive to the future development of neurodegenerative therapeutic techniques.

    关键词： neurodegenerative diseases,self-assembled nanocomposite,lysozyme amyloid fibrils,hyperthermia,cesium tungsten oxide nanoparticles

    更新于2025-09-16 10:30:52

  • Efficient and Stable Inverted Quantum Dot Light-Emitting Diodes Enabled by An Inorganic Copper-Doped Tungsten Phosphate Hole-Injection Layer

    摘要： Inorganic interfacial buffer layers have widely been employed for efficient and long lifetime optoelectronic devices due to their high carrier mobility and excellent chemical/thermal stability. In this paper, we developed a solution-processed inorganic tungsten phosphate (TPA) as hole injection layer (HIL) in inverted quantum dot light-emitting diodes (QLEDs) achieving a high external quantum efficiency (EQE) of up to ~20%. Further, the copper ions are doped into tungsten phosphate (Cu:TPA) which leads to an enhancement in hole injection due to increased hole mobility and conductivity of TPA as well as decreased hole injection barrier, enabling better charge balance in QLEDs and lower turn-on voltage from 5 to 2.5 V. Compared with the devices using conventional organic poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) HIL, the half-lifetime of Cu:TPA-based devices is over 3000 h at an initial brightness of 100 cd m-2, almost five-fold operating lifetime enhancement.

    关键词： Quantum Dot LEDs,Hole Injection Layer,Copper Doping,Tungsten Phosphate,Electroluminescence

    更新于2025-09-16 10:30:52

  • Addressing K/L-edge overlap in elemental analysis from micro-X-ray fluorescence: bioimaging of tungsten and zinc in bone tissue using synchrotron radiation and laser ablation inductively coupled plasma mass spectrometry

    摘要： Synchrotron radiation micro-X-ray fluorescence (SR-μXRF) is a powerful elemental mapping technique that has been used to map tungsten and zinc distribution in bone tissue. However, the heterogeneity of the bone samples along with overlap of the tungsten L-edge with the zinc K-edge signals complicates SR-μXRF data analysis, introduces minor artefacts into the resulting element maps, and decreases image sensitivity and resolution. To confirm and more carefully delineate these SR-μXRF results, we have employed laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) to untangle the problem created by the K/L-edge overlap of the tungsten/zinc pair. While the overall elemental distribution results are consistent between the two techniques, LA-ICP-MS provides significantly higher sensitivity and image resolution compared with SR-μXRF measurements in bone. These improvements reveal tissue-specific distribution patterns of tungsten and zinc in bone, not observed using SR-μXRF. We conclude that probing elemental distribution in bone is best achieved using LA-ICP-MS, though SR-μXRF retains the advantage of being a non-destructive method with the capability of being paired with X-ray techniques, which determine speciation in situ. Since tungsten is an emerging contaminant recently found to accumulate in bone, accurately determining its distribution and speciation in situ is essential for directing toxicological studies and informing treatment regimes.

    关键词： LA-ICP-MS,Overlap,X-ray spectroscopy (XPS | XRF | EDX),Analyte,Zinc,Tungsten

    更新于2025-09-12 10:27:22

  • Polyoxometalate‐derived multi‐component X/W2C@X, N‐C (X=Co, Si, Ge, B and P) nanoelectrocatalysts for efficient triiodide reduction in dye‐sensitized solar cells

    摘要： A series of multi-component X/W2C@X,N-C hybrid catalysts have been prepared to systematically investigate the electro-catalytic activity of triiodide reduction in DSSCs. Different components in catalyst promote photovoltaic performance by synergistic effect. The electronegativity of dopants can directly influence the catalytic activity of catalysts.

    关键词： nanocomposite,dye-sensitized solar cells,counter electrode,tungsten carbide,polyoxometalate

    更新于2025-09-12 10:27:22

  • In-situ characterization of tungsten microcracking in Selective Laser Melting

    摘要： Additive Manufacturing is a promising way of processing tungsten, with opportunities to create more complex parts than are possible using other powder metallurgical routes. This may lead to extended applications such as collimators, in fusion reactors, or in other structurally loaded, high temperature environments. The poor thermal shock resistance and ductile-to-brittle transition that occurs in tungsten above room temperature are challenges that hinder production of fully dense and crack free parts. This research employs high speed in-situ monitoring of Selective Laser Melting of single tracks to visualize crack initiation and propagation. The circumstances that lead to cracking are correlated with microstructural morphology and processing conditions.

    关键词： In-situ monitoring,Additive Manufacturing,Microcracking,Laser powder bed fusion,Tungsten,Selective Laser Melting

    更新于2025-09-12 10:27:22

  • Tm <sup>3+</sup> -Doped Harmonic Dissipative Soliton Mode-Locked Fiber Laser at 1.93 $\mu$ m Based on Tungsten Disulfide in Anomalous Dispersion Regime

    摘要： We report a harmonic dissipative soliton 1.93 μm thulium fiber laser based on a tungsten disulfide (WS2) saturable absorber (SA) in the anomalous dispersion regime. The multilayer WS2 nanosheets were prepared by liquid phase exfoliation method and the SA was fabricated by dropping WS2 solution onto a gold mirror. The transferred WS2 SA had a modulation depth of 2.5% and a saturation intensity of 0.82 MW/cm2. By incorporating the SA into a linear Tm3+ fiber laser cavity, harmonic mode-locked dissipative soliton laser was achieved at 1930 nm with the spectral width of 8 nm, the pulse energy of 3 nJ, the pulse width of 3.6 ns, and the repetition rate of 56.3 MHz. Based on the experimental results, it is shown that with the presence of harmonic mode-locking in 2 μm wavelength region, the multilayer WS2 serving as a SA was verified to be a good candidate for broadband high-energy mode-locking. The order of the harmonic dissipative soliton mode-locked pulses remains the same along with the increasing pump power.

    关键词： 2 μm fiber laser,2D material,tungsten disulfide,Mode-locked fiber laser,Tm3+-doped fiber

    更新于2025-09-12 10:27:22

  • [IEEE 2019 IEEE/MTT-S International Microwave Symposium - IMS 2019 - Boston, MA, USA (2019.6.2-2019.6.7)] 2019 IEEE MTT-S International Microwave Symposium (IMS) - A Novel VHF Heating System to Aid Selective Laser Melting

    摘要： A novel approach is proposed for penetrative heating of metal powders for component manufacture using selective laser melting (SLM). Large volumes of metal powders have been shown to have unusual properties at higher RF frequencies, whereby magnetic fields can penetrate into them almost completely, at depths much greater than the expected skin depth. A resonant structure at VHF (100-500MHz) and a medium power VHF source (delivering up to 75 W) are described, analyzed and demonstrated, to efficiently heat tungsten carbide powdered samples of volumes of 40cm3 to above 7000C. Further development of this technique will help alleviate the thermal instability problems widely encountered in SLM which lead to large thermal stresses and mis-shaped components.

    关键词： additive manufacturing,tungsten carbide,VHF heating,selective laser melting

    更新于2025-09-12 10:27:22

  • Near infrared radiation shielding using CsxWO3 Nanoparticles for infrared mini Light-Emitting Diodes

    摘要： Recently, near infrared LEDs have been used in small electronic devices due to the trend of manufacturing compact systems. The intensity of near infrared (NIR) optical device needs to be moderated if the chip emits too much power. In tradition, color pigments are used as additives in the encapsulant of LEDs to reduce the intensity of over irradiated NIR, a strategy which results in unaesthetic appearance. Cesium doped tungsten trioxide (CsxWO3) nanoparticles (NPs) have good near infrared absorption ability. Applying very few amount of CsxWO3 NPs into the encapsulation materials of NIR optical device can decrease NIR intensity while still maintain high visible light transmittance without losing aesthetic touch of those devices such as LED transmitters. The addition of only 0.0021 wt% CsxWO3/PMA dispersion in epoxy encapsulant can drop 15.5% NIR (860 nm) intensity but barely reduce visible light (only 3.2% at 450 nm). The excellent performance of CsxWO3 NPs; i.e., good NIR absorption and visible light transmission properties, can be suitable for maintaining the moderate luminescence intensity of small optoelectronic devices like NIR mini- or micro- light-emitting diodes.

    关键词： nanoparticles,Mini-LED,Near-infrared shielding,nanocomposites,Cesium doped tungsten trioxide

    更新于2025-09-12 10:27:22

  • Improving the R&D process efficiency of the selective laser sintering industry through numerical thermal modeling

    摘要： The selective laser melting (SLS) industry is a relatively novel industry within the broad spectrum of available additive manufacturing (AM) technologies. As with most developing industries, the primary aim is to develop better quality components at reduced costs, often with a disregard towards efficiency. Resource efficiency is a key component of waste management and ties directly to sustainable manufacturing. In the SLS industry, large quantities of raw material are wasted during the machine calibration stage. Each time a new material is developed for SLS manufacturing a specific set of processing parameters need to be developed in order to ensure that high density, high strength components are produced. This paper investigates the possibility of replacing the current inefficient research and development (R&D) methods with numerical modeling. The fusion process can be simulated in a numerical thermal model using a combination of temperature dependent material properties and heat transfer principles.

    关键词： tungsten carbide,powder bed fusion,numerical modeling,Additive manufacturing,process chain

    更新于2025-09-12 10:27:22

  • Estimation of plasma density perturbation from dusty plasma injection by laser irradiation on tungsten target in DiPS

    摘要： To investigate the interaction of dusty plasma with magnetized plasmas at divertor plasma simulator (DiPS), radial profiles of plasma density (ne) and electron temperature (Te) were measured in terms of plasma discharge currents and magnetic flux intensity by using a fast scanning probes (FSP) system with triple tips. Dusty plasma with dusts (a generation rate of 3 μg/s and a size of 1–10 μm) was produced via interactions between a high-power laser beam and a full tungsten target. As ne increases due to dusty plasma injection, the result was ~ 10% at a core region of the magnetized plasma with ne of (2 – 5) × 1011 cm?3 at steady state condition.

    关键词： dusty plasma,DiPS,plasma density perturbation,tungsten dust

    更新于2025-09-12 10:27:22