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Improving gas sensing by CdTe decoration of individual aerographite microtubes
摘要： Novel gas sensors have been realized by decorating clusters of tubular Aerographite with CdTe using magnetron sputtering techniques. Subsequently, individual microtubes were separated and electrically contacted on a SiO2/Si substrate with pre-patterned electrodes. Cathodoluminescence, electron microscopy and electrical characterization prove the successful formation of a polycrystalline CdTe thin film on Aerographite enabling an excellent gas response to ammonia. Furthermore, the dynamical response to ammonia exposure has been investigated, highlighting the quick response and recovery times of the sensor, which is highly beneficial for extremely short on/off cycles. Therefore, this gas sensor reveals a large potential for cheap, highly selective, reliable and low-power gas sensors, which are especially important for hazardous gases such as ammonia.
关键词： ammonia,electron microscopy,nanocomposite,hybrid material,gas sensing
更新于2025-09-09 09:28:46
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New organic dye/anionic clay hybrid pigments: Preparation, optical properties and structural stability
摘要： Encapsulation and subsequent stabilization of organic dye into layered double hydroxides (LDHs) are investigated. Three commercialized dye molecules such as: acid orange 6, acid yellow 50 and acid green 25, were intercalated in Zn2-Al-LDH by co-precipitation method, analyzed by ICP and UV–Visible, and characterized by XRD at di?erent temperatures. Functionalized organic molecules have been interleaved for the synthesized hybrid LDH materials. It is shown that the e?ect of encapsulation is revealed by the di?erent interactions according to the molecule size and stacking of dye molecules. Thermal behavior of hybrid materials showed a clear enhancement of the structural stability in temperature over the chloride-Zn2Al LDH, indicating that the assembly may appear as a mutual bene?t.
关键词： LDHs,Hybrid materials,Acid yellow 50,Acid orange 6,Acid green 25,Anionic dye
更新于2025-09-09 09:28:46
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Tunable multi-color luminescence and white emission in lanthanide ion functionalized polyoxometalate-based metal–organic frameworks hybrids and fabricated thin films
摘要： In this paper, luminescent hybrid material systems are prepared with porous polyoxometalate-based metal-organic framework (POM-based MOF)[La(H2O)4(pdc)]4}[SiMo12O40]$2H2O (1) through the introduction of lanthanide ions (Ln3+, Ln = Eu, Tb, Sm, Dy, Eu/Tb, Dy/Eu) by a solvothermal approach. The POM-based MOF serves as a host for protecting the luminescence of Ln3+ cations. The structure, thermal stability, ultraviolet absorption and visible light emission of the target hybrid materials are determined with powder X-rays diffraction patterns (PXRD), Fourier transform infrared spectra (FTIR), thermal-gravimetric analysis (TGA), inductively coupled plasma-mass spectrometry (ICP-MS) analysis, energy dispersive spectrometer (EDS), ultraviolet visible diffusion reflections spectra (UV-vis DRS) and especially luminescence spectra. The final luminescence of the Ln3+ hybrids can be adjusted by changing the composition of Ln3+ cations or converting the excitation wavelengths of them. Among [La0.95Dy0.045Eu0.005(H2O)4(pdc)]4}[SiMo12O40]$2H2O (Dy3+/Eu3+@1) emits white luminescence under the excitation at 295 nm and the Commission Internationale de L'Eclairage (CIE) chromaticity coordinate of it is (0.361, 0.3408). Moreover, we manufacture POM-based MOF thin films by using ethyl methacrylate (EMA) to assemble the POM-based MOF on a quartz plate as substrate. The hybrid thin films based on {La0.95Eu0.05(H2O)4(pdc)]4}[SiMo12O40]$2H2O (Eu3+@1) and La0.95Eu0.04Tb0.01(H2O)4(pdc)]4}[SiMo12O40]$2H2O (Eu3+/Tb3+@1) can also achieve white-light. The CIE chromaticity coordinates of them are (0.3425, 0.2548) and (0.3857, 0.3377), respectively.
关键词： Thin film,Lanthanide functionalization,Photofunctional hybrid material,Polyoxometallate based metal-organic frameworks,Luminescence
更新于2025-09-09 09:28:46
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Research on a novel power quality conditioner with PV for electrified railway
摘要： With the fast development of electric railway, harmonics and reactive power problems caused by electric locomotive load remains to be further improved. This paper presents a novel power quality conditioner based on multiple H-bridges with photovoltaic power. The proposed structure utilizes a hybrid cascaded 81-level converter in series with a PWM converter to achieve a high-voltage and large-capacity power quality conditioner, and photovoltaic power connects with the DC bus side of the hybrid cascaded 81-level converter to reduce active consumption for electric railway. The fundamental voltage of the hybrid cascaded 81-level converter is controlled by the traction network. The active component of the PWM converter output current is controlled by DC link voltage of the hybrid cascaded 81-level converter, and its reactive and harmonic components are controlled by reactive and harmonic currents from the load. The system structure, working principle and control method of the novel power quality regulator are analysed. A single-phase traction system simulation model is built in MATLAB/Simulink. Simulation results are presented to verify the feasibility and effectiveness of the proposed PQC.
关键词： PWM converter,power quality conditioner,electrified railway,photovoltaic power,hybrid cascaded 81-level converter
更新于2025-09-09 09:28:46
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Molecularly imprinted polymer based hybrid structure SiO2@MPS-CdTe/CdS: A novel fluorescence probe for Hepatitis A Virus
摘要： A novel designed fluorescence molecularly imprinted polymer (MIP) probe made from CdTe/CdS quantum dot (QD)-based silica nanoparticles (SiO2@MPS-CdTe/CdS) was successfully created via a sol?gel process. The target virus - hepatitis A virus (HAV) was selectively captured by imprinted polymer layer, resulting in the fluorescence quenching of the QDs within 20 min, which could be explained by the energy transfer mechanism. Under optimized conditions, the limit of detection for the SiO2@MPS-CdTe/CdS MIP was as low as 88 pmol?L?1, and excellent linearity was obtained from 0.2 to 1.4 nM. Additionally, the nanosensor was successfully used to detect the HAV from a dilution of human serum, in which recoveries were in the range of 96.7%-103.8%. Overall, the current work proposes a novel and cost-effective method to synthesize SiO2@MPS-CdTe/CdS MIPs for use as a tool to rapidly and efficiently detect HAV, and it also provides promising perspectives to further advance virus imprinting research.
关键词： Hepatitis A Virus (HAV),Virus Molecularly Imprinted Polymer,Fluorescence Detection,Quantum Dots,Hybrid Structure
更新于2025-09-09 09:28:46
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Effects of Rare-Gas Matrices on the Optical Response of Silver Nanoclusters
摘要： The optical response of silver clusters, Agn with n = 8, 20, 35, 58, 92, embedded in a rare-gas matrix are calculated in the framework of the Time-Dependent Density Functional Theory (TDDFT). We present a methodology able to reproduce with unprecedented accuracy the experimental spectra measured on metal clusters embedded in neon, argon, krypton and xenon solid matrices. In our approach, the metal cluster is surrounded by explicit rare-gas atoms and embedded in a polarizable continuum medium. Interactions with the surrounding medium affects both the position and the width of the surface plasmon absorption band of metal clusters. The size dependent shift of the surface plasmon band is evaluated in the case of a neon matrix. While the band shifts to lower energies (red shift) for large clusters, it shifts to higher energies (blue shift) for very small clusters.
关键词： Silver Nanoclusters,Optical,TDDFT,Plasmonics,Magnetic,Hybrid Materials,Rare-Gas Matrices
更新于2025-09-09 09:28:46
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Engineering SrSnO <sub/>3</sub> Phases and Electron Mobility at Room Temperature Using Epitaxial Strain
摘要： High-speed electronics require epitaxial films with exceptionally high carrier mobility at room temperature. Alkaline-earth stannates with high room-temperature mobility show outstanding prospects for oxide electronics operating at ambient temperatures. However, despite significant progress over the last few years, mobility in stannate films has been limited by dislocations due to the inability to grow fully coherent films. Here, we demonstrate the growth of coherent, strain-engineered phases of epitaxial SrSnO3 (SSO) films using a radical-based molecular beam epitaxy approach. Compressive strain stabilized the high-symmetry tetragonal phase of SSO at room temperature (RT), which, in bulk, exists only at temperatures between 1062 K and 1295 K. We achieved a mobility enhancement of over 300% in doped films compared with the low temperature orthorhombic polymorph. Using comprehensive temperature-dependent synchrotron-based X-ray measurements, electronic transport and first principles calculations, crystal and electronic structures of SSO films were investigated as a function of strain. We argue that strain-engineered films of stannate will enable high mobility oxide electronics operating at RT with the added advantage of being optically transparent.
关键词： phase transition,Hybrid molecular beam epitaxy,half-order diffraction,strain engineering,density functional theory,high mobility,Octahedral rotations
更新于2025-09-09 09:28:46
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Solvothermal Syntheses, Crystal Structures, and Photocatalytic Properties of Iodoplumbate Hybrids with Ni(II) Complex Templates
摘要： Organic–inorganic iodoplumbate hybrids [Ni(en)2]2Pb3I10 (1), [Ni(en)3]Pb2I6 (2) (en = ethylenediamine), [Ni(dien)2]Pb2I6?H2O (3) (dien = diethylenetriamine), [Ni(14-TMC)][PbI3]2?DMF (4) and [Ni(14-TMC)]2[Pb5I14(DMSO)2] (5) (14-TMC = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane) were prepared using different Ni(II) complex cation as structural directing agents under solvothermal conditions. Compounds 1?4 consist of 1-D [Pb3I10 4–]n and [Pb2I6 2–]n polymeric anions constructed by PbI6 octahedra via corner-, edge- or face-sharing, respectively. The novel organic hybrid iodoplumbate anion [Pb5I14(DMSO)2 4–]n in 5 is composed of PbI6 and PbI5O octahedra via edge- and face-sharing. The formation of polymeric iodoplumbate anions in 1?5 indicates different structure-directing effect of the Ni(II) complex cations with various polyamino ligands under appropriate reaction and crystallization conditions. Compounds 1?5 exhibit tunable band gaps varying in the range of 2.18?2.61 eV. Compounds 4 and 5 are more effective than 1 and 3 in the photocatalytic degradation of methylene blue.
关键词： Photocatalytic property,Organic-inorganic hybrid,Nickel,Iodoplumbate,Templating synthesis
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 5G World Forum (5GWF) - Silicon Valley, CA (2018.7.9-2018.7.11)] 2018 IEEE 5G World Forum (5GWF) - Millimeter Wave Massive MIMO with Alamouti Code and Imperfect Channel State Information
摘要： Massive MIMO is one of the technologies considered in 5G to provide a much higher capacity without requiring more wireless spectrum. Because of the congestion in the radio frequency spectrum below 6 GHz, the millimeter Wave (mmWave) band has increasingly become more attractive to researchers since it offers a much larger unused bandwidth. However, the higher path loss at mmWave frequencies and the poor scattering nature of the mmWave channel (fewer paths exist) represent a challenge for communications. A hybrid beamforming technique with large antenna arrays and the Alamouti coding scheme are used in this paper to improve the performance of a single-user mmWave massive MIMO system. When perfect Channel State Information (CSI) is not available at the Base Station (BS), computer simulations have shown that a gain of 20 dB or more can be achieved by using the Alamouti code compared to the system with hybrid beamforming only, and more importantly, the error probability does not level off.
关键词： hybrid precoding and combining,mmWave communication,Massive MIMO,Alamouti Code
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE 5G World Forum (5GWF) - Silicon Valley, CA (2018.7.9-2018.7.11)] 2018 IEEE 5G World Forum (5GWF) - First Commercial Hybrid Massive MIMO System for Sub-6Hz Bands
摘要： Massive multiple-input and multiple-output (MIMO) has been the subject of interest in both industry and academia for the past few years. Massive MIMO refers to the use of a large number of antennas typically at the base station (BS) to serve multiple user equipment (UE) simultaneously to deliver reliable and high data throughput. Two basic architectures have been considered in the literature. First is a full digital massive MIMO where all the beamforming and precoding is performed digitally in baseband and a radio frequency (RF) chain is required for every antenna element. In the second architecture referred to as hybrid massive MIMO, beamforming and precoding are done in two stages, digital precoding over fewer digital ports followed by analog beamforming across large number of antenna elements. In this paper, we provide a comparison of implementation challenges for each approach. We introduce the High Definition Active Antenna System (HDAAS), a novel scalable architecture to implement a hybrid Massive MIMO system. This design philosophy is used to build BeamCraft500, which we believe is a first commercial hybrid 3D beamforming system operating at 2 GHz. We also present results from one of the field trials in a live LTE network that validate the stability and performance of the system under real world conditions.
关键词： 3D beamforming,HDAAS,Hybrid Massive MIMO,LTE,Massive MIMO,BeamCraft500
更新于2025-09-09 09:28:46