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Journal of materials science. Materials in electronics
Chapman and Hall
Journal of materials science. Materials in electronics

Chapman and Hall

0957-4522

Journal of materials science. Materials in electronics/Journal Journal of materials science. Materials in electronics
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    Synthesis of Li_xNa_yK_(1-x-y)YF_4: Yb~(3+), Er~(3+) by hydrothermal method and its upconversion properties

    Lu XiongHaisheng HuMeitang LiuChongji Zhang...
    2260.1-2260.9页
    查看更多>>摘要：Upconversion materials have significant application prospects in many fields due to the advantages of being excited by infrared light. However, the development of upconversion materials is constrained by low upconversion efficiency and low luminescence intensity. The aim of this work is to improve the luminescence efficiency and intensity of fluorine-based upconversion luminescent materials through ternary alkali metal doping. A series of ternary alkali metal-doped Li_xNa_yK_(1-x-y)YF_4:Yb~(3+), Er~(3+) novel upconversion luminescent materials were synthesized by a one-step facile hydrothermal method, and their mechanisms were explored. The results show that the doping of Li, Na, and K ions changes the crystal structure of Li_xNa_yK_(1-x-y)YF_4:Yb~(3+), Er~(3+), thereby affecting the spatial structural relationship between the rare-earth ions, which changes the energy transfer efficiency to them. The luminescence intensity of the prepared Li_xNa_yK_(1-x-y)YF_4:Yb~(3+), Er~(3+) was 30 times higher than that of the undoped samples when doped with Li, Na, and K ions in a molar ratio of 10:6:9. This study provides a simple and effective method for the preparation of upconversion materials with excellent luminescent properties.
      原文链接:
    • NETL
    • NSTL
    • Springer Nature

    High-performance supercapacitors anodes based on porous carbon@vanadium nitride composite modified by gold nanoparticles

    Abdalazeez Ismail Mohamed AlbashirXiaoya KangAbdalbagi Ismail Mohamed AlbashirYingxia Ma...
    2261.1-2261.11页
    查看更多>>摘要：Both porous carbon and vanadium nitride have been considered promising anode materials for supercapacitors that provide outstanding electrochemical performances. Here, porous carbon and vanadium nitride composites is fabricated and modified by gold nanoparticles using in-situ reduction method followed by hydrothermal reaction and heat-treatment. The characteristics of obtained composite material were determined through the utilization of advanced analytical techniques, including SEM, TEM, XPS, and XRD. These investigations have unambiguously verified the presence of gold nanoparticles and vanadium nitride on the surface of active carbon. The electrochemical investigations proved that the synthesized anode material possesses an impressive specific capacitance of 458.0 F/g at current density of 1.0 A/g. Furthermore, upon assembling the asymmetric device, an impressive E (18.9 Wh/kg) was achieved at P (180.0 W/kg). Even after subjecting the device to 10,000 cycles, a notable retention of 87.7% in specific capacitance was determined at a current density of 2.0 A/g.
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    • NETL
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    • Springer Nature

    Influence of orange azo dichroic dye on morphological, electro-optical, phase transition and absorption behaviour of ZnO nanoparticles-induced homeotropically aligned liquid crystal display cell

    ChinkyParul MalikPankaj Kumar
    2262.1-2262.13页
    查看更多>>摘要：In this paper, the influence of orange azo dichroic dye on morphological, electro-optical (EO), phase transition and absorption behavior of zinc oxide (ZnO) nanoparticles (NPs)-induced homeotropically aligned liquid crystal (HALC) cells have been studied. Two sample cells were prepared for experimental analysis. The NPs-induced HALC cell was prepared via doping of optimized concentration (0.3 wt/wt %) of ZnO NPs in negative anisotropic host liquid crystal (LC). Another cell was prepared with the same mixture in addition to doping of a fixed amount of orange azo dichroic dye. Experimental results revealed that the addition of dichroic dye in ZnO NPs-induced HALC cell lessens the threshold and operating voltages compared with pristine HALC cell. Comparatively higher contrast was observed for dye-doped ZnO NPs-induced HALC cell due to presence of the dye molecules which resulted in a slight trivial minute decrease in OFF state transmission. In addition, the phase behavior was also studied for prepared samples and found a shift to slightly higher transition (from nematic to isotropic) temperature for dichroic dye-doped ZnO NPs-induced HALC cell compared with NPs-induced HALC cell. Into the bargain, the order parameter (S) was also evaluated using an empirical relation among phase transition temperature and found in agreement with reported values of S (0.3-0.8) for LCs. Additionally, in analogy with solid like band theory, both cells were explored for measurement of band gap using under UV-Visible irradiations and found reduced value of same on adding the dichroic dye.
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    • Springer Nature

    Ionic surfactants of different dipole moments as anti-solvent additives for air-processing MAPbI_(3-x)Cl_x perovskite thin films

    Jaquelina Camacho-CaceresMario A. Millan-FrancoMelvia Carinne Mejia-VazquezCarlos Fabian Arias-Ramos...
    2263.1-2263.15页
    查看更多>>摘要：Three ionic surfactants, didodecyldimethylammonium bromide (DDABr), sodium lauryl ether sulfate (NaLES) and sodium lauryl sulfate (NaLS), with different dipole moment values: 0.907, 17 and 212 Debye, respectively, have been used as anti-solvent additives to remove the moisture from perovskite precursor solutions. The three additives impact in different ways on the crystallinity, wet-tability and morphology of perovskite thin films, as well as on the stability and efficiency of air-processed perovskite solar cells (PSCs). The hydrophobic groups of the additives at the surface of perovskite thin films help to increase the stability of PSCs, especially DDABr of the lowest dipole moment. On the other hand, NaLES, of the highest dipole moment, is the most efficient to extract moisture from the perovskite precursor coatings, increasing the average power conversion efficiency (PCE) of NaLES-based PSCs from 16.16 ± 0.94% to 17.21 ± 0.32% in comparison with that of the reference. Furthermore, the synergy between NaLES and the perovskite precursor additive, KI, achieves the best photovoltaic performance of the PSCs, leading to an average PCE of 17.42% and the best PCE of 18.75%. It is concluded that ionic surfactants of different dipole moments are good candidates as anti-solvent additives to improve the efficiency and stability of air-processed PSCs.
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    • Springer Nature

    Role of Y~(3+) on the temperature-dependent magnetic properties of Lu orthoferrite prepared by solution combustion method using a mixture of fuels

    V. Jagadeesha AngadiSambu Charan DasSouvik ChatterjeeAbdullah A. Al-Kahtani...
    2264.1-2264.8页
    查看更多>>摘要：LuFeO_3 and Lu_(0.2)Y_(0.8)FeO_3 powder were prepared by solution combustion method using urea and glucose as fuels for the first time. Samples were characterized by X-ray diffraction, and results reveal that Lu_(0.2)Y_(0.8)FeO_3 has a dual structure consisting of an orthorhombic framework and a secondary hexagonal framework. The substitution of Y~(3+) in LuFeO_3 resulted in a reduction in the crystal size. These irregularities are directly responsible for the shifts in spin polarity due to them. When Y~(3+) ions partially substitute Lu~(3+) ions, both the temperature at which the Curie transition occurs and the temperature at which the spin reorientation transition occurs rise. The magnetization profiles exhibit significant variations as a function of temperature. It is common knowledge that orthorhombic magnetic systems, such as LuFeO_3, show a bifurcation and bulge at 76 K caused by spin-reorientation transition temperatures (TSR). The applied field strength of 500 Oe brings out that data spike. Because of the diamagnetic dopant effect, the ZFC and F.C. curves of Lu_(0.2)Y_(0.8)FeO_3 display a small amount of bifurcation in their behavior. The magnetization slowed as the temperature increased, and there was no phase transition between 2 and 300 Kelvin. When heated to higher temperatures, it undergoes a phase change that changes its magnetic properties from paramagnetic to antiferromagnetic. LuFeO_3 dielectric characteristics were studied across a broad frequency spectrum, ranging from 2 to 300 K, and temperatures between those extremes. Observations made as the system got closer to the spin reorientation transition included an increase in temperature across the board, a divergence in frequency ranges, and an increase in the dielectric constant (TSR). At 150 kilo hertz, the low-frequency dispersion begins to increase, and it will keep growing until it approaches 225 kHz. Magnetoelectric interaction can be identified by a slight bump close to the transformation from antiferromagnetic to paramagnetic. The loss tangent was used as an example to demonstrate the frequency dispersion.
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    • Springer Nature

    Carrier transport and thermoelectric property enhancement of polypyrrole-Nio/single-walled carbon nanotube composite system-experimental and DFT study

    Prasenjit ChakrabortyTanmoy PaulKajari KarguptaDipali Banerjee...
    2265.1-2265.17页
    查看更多>>摘要：High-efficiency and chalcogenide (sulphides, selenides, tellurides, and polonides) free green thermoelectric power generation is a reliable and sustainable way to solve environmental and energy issues. We report an investigation on a ternary composite of Polypyrrole (PPy), Nickel (NiO) and Single-walled carbon nanotube (SWCNT) nanostructure prepared by an inexpensive two-step simple chemical route. Incorporating 50 weight% of SWCNT provides heterogeneous sites for NiO grain nucleation. It indicates a homogeneous SWCNT distribution in the PPy matrix, sensitive to the crystallinity and interaction between constituents to tune thermoelectric performance. The growth of PPy along the SWCNT's surface, due to strong π-π interaction with NiO encapsulation, leads to a well-ordered packed structure of the PPy chain, promoting the carrier mobility in the composite. Thermoelectric parameters and charge carrier transport are correlated with carrier concentration and mobility. Density functional theory is analysed to investigate the details of electronic structure and charge transportability, which shows an adequate amount of density of states near the Fermi level. This offers a 279 times enhanced dimensionless figure of merit (ZT) of 0.12 for PPy-NiO/SWCNT-50% as compared to that of the PPy-NiO composite at temperature 400 K, where for PPy, it is 8.94 × 10~(-6).
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    • Springer Nature

    Effect of Fe doping on structural, morphological and electrochemical characteristics of CuS@CNTs composite electrode material to explore the Redox mechanism in supercapattery device

    Muhammad Ammar YasirHaseebul HassanNimra MuzaffarAmir Muhammad Afzal...
    2266.1-2266.13页
    查看更多>>摘要：Carbon nanotubes (CNTs), which are classified as one-dimensional (1D) materials have attracted considerable interest in the scientific community due to their extraordinary electrical conductivity, enormous surface area, and chemical stability. Supercapattery, a device that combines the advantages of supercapaci-tors and batteries, has attained substantial interest due to its impressive power and energy densities. We have synthesized the binary FeCuS and FeCuS@CNTs nanocomposite through hydrothermal technique. Due to the synergistic effect, the efficiency of the electrode is improved with CNTs doping. The composite electrode FeCuS@CNTs showed an extraordinary specific capacity of 1217 Cg~(-1), exceeding the individual capacity values of iron sulfide (807 Cg~(-1)) and copper sulfide (532 Cg~(-1)). FeCuS@CNTs nanocomposite is used as the anode and activated carbon (AC) is used as the cathode in the fabrication of a supercapattery device. We achieved an extraordinary specific capacity of 342 Cg~(-1), surpassing previously reported values. The asymmetric device showed an extraordinary performance, with a power density (P_d) of 2352 W/Kg and an energy density (E_d) of 37 Wh/Kg. To check the cyclic stability, we evaluated the hybrid device for up to 1000 cycles, and it exhibited impressive capacity retention (CR) of 84% and Coulombic efficiency (CE) of 93%. Our results represent that FeCuS, with a 50:50 weight ratio and CNT doping, may be a better electrode material for asymmetric supercapacitor applications.
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    • Springer Nature

    CdS sensitizes TiO_2 nanotubes arrays for photocatalytic degradation of water pollution

    Xudong XiongZhenkun DuanYang LiuXiaobo Xiong...
    2267.1-2267.13页
    查看更多>>摘要：Titanium dioxide nanotube arrays (TNAs) has shown great potential for applications in environmental pollution treatment and solar chemical energy conversion. Cadmium sulfide (CdS), also as a typical photocatalytically active semiconductor material, has a narrow forbidden bandgap energy of only 2.42 eV. The unique hollow tubular structure of titanium dioxide nanotubes, on the other hand, offers the possibility of CdS composite TNAs. In this study, TNAs were first prepared by a one-step anodic oxidation method under optimized conditions, and then the prepared TNAs were used as cathodes to deposit CdS on TNAs substrates by electrodeposition in an electrolyte containing sodium thiosulfate and cadmium chloride. The effects of electrochemical deposition voltage, reaction time, and the relationship between the ratios of S and Cd sources on the properties of CdS/TNAs composite structures were systematically investigated. The CdS/ TNAs with the best characterization performance were selected for photocatalytic degradation, and methylene blue was used to simulate organic pollutants. The results showed that CdS/TNAs had better photocatalytic activity compared with conventional TNAs. Based on this, the composite structure of CdS/TNAs by physical adsorption was also selected as a reference, and the results showed that the CdS/TNAs produced by electrochemical deposition had better photocatalytic performance and chemical stability. It provides a feasible way in water pollution treatment.
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    • NETL
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    • Springer Nature

    Facile construction of BiOI/Nb_2O_5 heterojunction films and their excellent photocatalytic activity

    Rong JiaLiang HaoTe HuYiqiang He...
    2268.1-2268.10页
    查看更多>>摘要：A conventional hydrothermal method followed by a facile immersion method is used to prepare BiOI/Nb_2O_5 heterojunction films on the wire mesh made of stainless steel. The results show that sea urchin-like Nb_2O_5 nanospheres of orthorhom-bic structure and hierarchical flower-like BiOI with a tetragonal crystal type were formed in the preparation. BiOI and Nb_2O_5 combined firmly at the micron and nanoscale. They have formed heterojunctions. The optical measurements show that the heterojunction formation markedly extended the visible light absorption wavelength range even to 600 nm. The optical band gap values of the BiOI/ Nb_2O_5 heterojunction films were decreased from 3.05 to ～ 1.63 eV. PL spectra revealed the heterojunction formation significantly inhibited the recombination of photogenerated electron-hole pairs. The electrochemical testing suggests that the photocurrent density of the BiOI/Nb_2O_5 heterojunction films is nine times that of the individual Nb_2O_5 film at most. It means that the heterojunction observably improved the separation efficiency of photogenerated charges. Based on the above strategy, the photocatalytic activity in degrading RhB dye in an aqueous solution was enhanced by 6.2 times at most. When the immersion number was 12, the heterojunction film exhibited the most excellent photocatalytic activity. A possible mechanism of photocatalytic performance improvement was also discussed.
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    • Springer Nature

    Investigating the impact of Cs doping on physical properties and unveiling its potential as a UV detector on ZnO thin films

    Faeza AlkorbiSherif M. MostafaMoustafa M. AhmedAhmed A. Aboud...
    2269.1-2269.14页
    查看更多>>摘要：Herein, we present a study on the influence of Cs doping concentration on the physical properties of ZnO films. The films were deposited using the spray pyrol-ysis technique with consistent deposition parameters, while varying the Cs concentration from 1 to 5 weight percentages (wt%). X-ray diffraction (XRD) analysis revealed the presence of mixed phases in the ZnO films, including Zinc blende (ZB) and Wurtzite (WU) phases. To determine the crystallite size, two methods were employed: Scherrer's equation and Williamson-Hall equation. Scherrer's equation demonstrated inconsistent changes in the crystallite size of the cubic and hexagonal phases with varying Cs content. Notably, the Cs-lwt% film exhibited the smallest crystallite size, with an average value of 29.4 nm. Conversely, Williamson-Hall analysis showed a reduction in crystallite size from 42 nm for pure film to 17.2 nm for Cs-5wt% film. Scanning electron microscopy (SEM) images indicated that the grain size exceeded the crystallite size. The elemental composition analysis using energy-dispersive X-ray spectroscopy (EDX) confirmed the successful incorporation of Cs into the deposited films. Moreover, investigations into the optical band gap values revealed a decrease in both pure and Cs-doped films as Cs concentration increased. Lastly, we evaluated the sensing performance of all films under 365nm UV light at different applied voltages (10, 20, and 30V). Remarkably, the Cs-lwt% film displayed minimal rise and decay times compared to other films which exhibited higher values for both parameters.
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    • NETL
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    • Springer Nature