MATERIALS LETTERS
·
2022
·
IF 3.574
Zhiliang Zhou,Debao Liu,Zelong Wang,Baosheng Xu
Nd 2 Zr 2 O 7 microbelts were successfully prepared by simple electrospinning paired with calcination . The composition, microstructure, and structure of the as-prepared Nd 2 Zr 2 O 7 microbelts were systematically characterized through a combination of characterisations, such as XRD , SEM, TEM, FT-IR, and TG-DSC techniques. Results indicated that the as-prepared Nd 2 Zr 2 O 7 microbelts had a pyrochlore-type crystal structure and uniform size with about 10 μm thickness. Moreover, a feasible formation mechanism of the Nd 2 Zr 2 O 7 microbelts was discussed. The present procedure can be expanded to develop other rare-earth zirconate materials with belt structure.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMPHYSCHEM
·
2020
·Vol. 21
·期 5
·397-405
·
IF 3.144
Feiyu Zhao,Xue Luo,Lixiang Liu,Jianhang Lv,Xianping Fan,Xvsheng Qiao,Yang Xu,Lorenz Kienle,Xianghua Zhang,Guodong Qian
Graphical Improved responsivity : GeSe micro-sheets and micro-belts were synthesized by a chemical orientation growth method in 1-octadecene solvent and oleic acid solvent, respectively. The photodetectors based on single micro-belt showed a broadband spectral photoresponse with high responsivity (5562 A/W) and detectivity (3.01×10 12 Jones). It demonstrates significant application potential in the visible and NIR photodetection. GeSe micro-sheets and micro-belts have been synthesized by a facile one-pot wet chemical method in 1-octadecene solvent and oleic acid solvent, respectively. The adsorption of more oleic acid molecules on the (002) plane promoted growth along [010] direction of the GeSe micro-belts and limited carrier transport in this direction, resulting in higher carrier concentration and mobility of the GeSe micro-belts. The performance of the photodetectors based on the single GeSe micro-sheet and the single GeSe micro-belt was investigated under illumination at 532 nm, 980 nm and 1319 nm. Both, photodetectors based on a single GeSe micro-sheet and a single GeSe micro-belt, exhibit a high photoresponse, short response/recovery times, and long-term durability. Moreover, the photodetector based on a single GeSe micro-belt displays a broadband response with a high responsivity (5562 A/W at 532 nm, 1546 A/W at 980 nm) and detectivity (3.01×10 12 Jones at 532 nm, 8.38×10 11 Jones at 980 nm). These excellent characteristics render single GeSe micro-belts very interesting for use as highly efficient photodetectors, especially in the NIR region.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
DOI
高影响因子
Advanced Optical Materials
·
2021
·Vol. 10
·期 4
·2102315
·
IF 9.926
Ziqing Li,Chaolei Zuo,Xinya Liu,Zhuangzhuang Ma,Zhifeng Shi,Xiaosheng Fang
Lead-free ternary copper iodide perovskite analogues demonstrate great potential in photodetector, due to their nontoxity and excellent photophysical properties. However, the fast carrier recombination limits the photoelectric conversion efficiency. Herein, a room-temperature growth strategy with the selected raw ratio is adopted to enhance carrier dynamics. The optimized-grown CsCu 2 I 3 single crystal exhibits longer carrier lifetime of 157 ns, and its switch ratio and response time are enhanced by 20 000% and 600% compared with those of stoichiometric-grown single crystal, respectively. Furthermore, space-confined method is introduced to prepare ultralong single-crystalline CsCu 2 I 3 microbelt, with the aspect ratio up to 600. The sensitivity and self-powered performance of the UV photodetector are improved through constructing heterojunction with p-CuI and asymmetric electrodes. The enhanced performance is ascribed to superior type-II band alignment between CsCu 2 I 3 and CuI, which effectively promotes the separation of photogenerated carriers. This work not only provides an efficient way to boost the photoresponse in low-dimensional metal halide perovskite analogue, but also displays 1D anisotropic growth for potential application in large-area vapor-assisted patterned devices.
研究领域:
材料科学
·
光电探测器
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Bing Liu,Ke Sha,Ying Qiang Jia,Yu Hui Huang,Cheng Chao Hu,Lei Li,Da Wei Wang,Di Zhou,Kai Xin Song
Cold sintering is adopted to pre-densify LiF ceramics, where the relative density increases significantly from 72.1 % at 125 MPa to 88.9 % at 500 MPa. The following post-annealings at 800 °C lead to further optimizations of densification, and near-full densifications with relative densities of 95.6 % and 97.6 % are achieved at 375 and 500 MPa, respectively. Qf value increased with increasing uniaxial pressure until it reaches the maximum value of 134,050 GHz at 375 MPa, which is 1.82 times higher than that via conventional sintering (73,800 GHz). ε r and τ f are mainly determined by the relative density, and the optimum microwave dielectric properties are obtained as follows: ε r = 8.45, Qf = 134,050 GHz, τ f =–135 ppm/°C. A microstrip patch antenna is designed and fabricated using the LiF ceramic as the substrate, which gives an S11 of –20.3 dB, a simulated high efficiency of 90.5 %, and a gain of 4.25 dB at the resonant frequency of 6.81 GHz.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2021
·
IF 15.881
Jin-Lin Yang,Da-Qian Cai,Xiao-Ge Hao,Ling Huang,Qiaowei Lin,Xiang-Tian Zeng,Shi-Xi Zhao,Wei Lv
The practical uses of lithium–sulfur batteries are greatly restricted by the sluggish reaction kinetics of lithium polysulfides (LiPSs), leading to low sulfur utilization and poor cyclic stability. Using the heterostructure catalysts is an effective way to solve the above problems, but how to further enhance the conversion efficiency and avoid the surface passivation by the insulative Li2S has not been well investigated. Herein, a heterostructure catalyst with rich heterointerfaces was prepared by modifying Mo2N microbelt with SnO2 nanodots. The formed rich interfaces with high accessibility act as the profitable nucleation sites guiding the Li2S 3D growth, which avoids the catalyst surface passivation and facilitates the LiPS conversion. The introduction of SnO2 nanodots also enhances the LiPS adsorption. Thus, the assembled battery with the above catalyst as the cathode additive shows a high capacity of 738.3 mAh g–1 after 550 cycles at 0.5 C with an ultralow capacity decay of 0.025% per cycle. Even with high sulfur loading of 9.0 mg cm–2, good cyclic stability is also achieved at 0.5 C with a low E/S ratio of 5 μL mgs–1. This work shows an effective way to enhance the LiPS conversion kinetics and guide Li2S deposition in Li–S batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
MEASUREMENT
·
2025
·
IF 5.6
Ruishu Zhang,Wenyi Sheng,Wenfeng Ni,Fanjia Meng,Juan D. González-Teruel,Scott B. Jones
Electromagnetic (EM) sensors are widely used to determine soil water content in agricultural, geotechnical, and ecological applications. However, devices operating at lower frequencies, typically in the tens to one hundred MHz range, are more susceptible to interference from various soil properties and mechanisms, which can impact measurement accuracy. In this study, we introduced a microstrip-line-based measurement system designed to operate at variable frequencies for soil property determination. The system leveraged a direct digital synthesizer (DDS) to generate sinusoidal signals within the 20–400 MHz range, enabling the determination of soil dielectric permittivity ( ε ) and electrical conductivity ( σ ) through phase difference ( PD ) and magnitude ratio ( MR ) measurements between test and reference signals. Both EM simulations and laboratory experiments validated the correlation between ε and PD , as well as σ and MR , for the materials under test (MUT). Results showed that higher MUT ε produced larger PD values, while increased MUT σ led to lower MR values. Quadratic polynomial fits achieved high R 2 , with root mean square errors below 3 units for ε and 0.6 dS m −1 for σ across the examined frequency range. The effect of σ on ε determination accuracy was significantly reduced at higher frequencies (200–400 MHz), with relative error below 10 % and optimal performance of 8 % observed at 250 MHz. The development of this microstrip-line-based measurement system provides a flexible and practical approach for estimating soil ε and σ across a range of frequencies within the VHF/UHF bands, with potential for adaptation to in situ applications.
研究领域:
农业科学
·
环境科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 21
·12969-12975
·
IF 3.269
Yue Zhang,Yudai Huang,Yakun Tang,Hongyang Zhao,Yanjun Cai,Xingchao Wang,Yong Guo,Dianzeng Jia,Jun Zong
Bicontinuous hierarchical mesoporous LiFePO4/C (BHM-LFP/C) microbelts have been synthesized using a simple dual-solvent electrospinning method for the first time. The use of a dual-solvent is beneficial for the electrospinning synthesis, which increases the salt solubility, as well as decreases the surface tension to improve the spinnability. The sample exhibits a high reversible capacity (153 mA h g−1 at 0.5C), and achieves an excellent high rate cycling performance. The enhanced electrochemical performance can be attributed to the unique microbelts providing bicontinuous electron/ion pathways, and the thoroughly mesoporous structure facilitating electrolyte penetration, especially for hierarchical architectures, which have three-dimensional diffusion channels for Li+. This method can be extended to fabricate other electrospun multi-element oxide cathode materials for advanced lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 33
·期 3
·1183-1191
·
IF 2.478
Dong Yanchen,Peng Haiyi,Xue Yulei,Xing Jianping,Gu Zhongyuan,Yao Xiaogang,Lin Huixing
Polyphenylene oxide (PPO)-based microwave composite substrates filled with different volume fractions (10, 20, 30, 40, 50 vol%) of MgTiO 3 -Ca 0.7 La 0.2 TiO 3 (MTCLT) ceramics were prepared by injection-molding process. The microstructure, thermal, mechanical, and dielectric properties of the PPO/MTCLT substrates were fully studied. The results showed that PPO/MTCLT substrates with dense microstructure and uniform filler distribution were obtained when the filler fraction didn’t exceed 30vol%. Further increase of the filler fraction brought about agglomeration of ceramics and weakened interfacial bonding, producing more pores in the substrates. With increasing volume fraction of ceramics, the coefficient of thermal expansion (CTE) of the substrates decreased significantly, while the bending strength increased first and then decreased, reaching a maximum at 30 vol%. Moreover, the dielectric constant of the substrates increased remarkably, while the dissipation factor decreased first and then increased. Increasing the testing frequency had little effect on the dielectric constant but increased the dissipation factor gradually. PPO/MTCLT composite substrate with filler fraction near 30 vol% exhibited the best performance and was used to fabricate a microstrip antenna. The antenna showed good performance with antenna gain over 3.54 dB and low axial ratio below 1.24 dB. The PPO/MTCLT microwave composite substrates prepared by injection-molding process exhibited good comprehensive properties, being important candidates for microwave and millimeter-wave applications.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 27
·21737-21745
·
IF 2.779
Lin Feng Li,Liu Bing,Song Kai Xin
NaLaMgWO 6 microwave dielectric ceramics have been synthesized via the standard solid-state reaction method. The Rietveld refinement of the X-ray diffraction patterns indicates that NaLaMgWO 6 crystallizes in a monoclinic crystal structure with a C 2/ m space group. Raman spectrum of the NaLaMgWO 6 ceramic is collected, and the correlations between the Raman active modes and chemical bond vibrations are systematically identified. The optimum microwave dielectric properties are obtained when sintered at 1550 °C, with ε r = 17.1, Q f = 26,150 GHz, and τ f = − 83.4 ppm/°C. A microstrip patch antenna operating at the sub-6 GHz band is fabricated using the NaLaMgWO 6 ceramic as the substrate. The fabricated antenna resonates at 3.82 GHz, which exhibits an excellent S 11 value of − 26 dB, a minimum VSWR value of 1.07, and a satisfactory simulated efficiency of 72.2%. The good antenna performance demonstrates the great application potential of NaLaMgWO 6 ceramic in the sub-6 GHz band antennas.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2020
·Vol. 104
·期 5
·2125-2133
·
IF 3.502
Naichao Chen,Bin Xiao,Xinwei Xu,Tao Sun,Fei Jin,Meiyu Chen,Xianqiang Chen,Hong Wang
(1- x )Na 2 WO 4 – x Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 O 4 (NWO-NCZO) ceramic composites ( x = 0–0.6) were successfully prepared by the cold sintering method under a uniaxial pressure of 200 MPa at 150°C for 30 min. The microstructures and electromagnetic properties of (1- x )NWO- x NCZO ceramic composites with different NCZO contents have been systematically investigated. The obtained biphasic NWO-NCZO ceramic composites possess dense microstructures. The 0.4NWO–0.6NCZO ceramic composite exhibits a matched relative permittivity and relative permeability of around 8 in the frequency range from 10 to 200 MHz, which is beneficial for impedance matching between antenna and free space. A prototype of microstrip antenna based on the developed NWO-NCZO ceramic composite is designed and to demonstrate its application in miniaturized antennas. The simulation results revealed that the size of the radiation patch of the antenna can be reduced by 60% yet with bandwidth being enhanced 26.5 times when the 0.4NWO–0.6NCZO ceramic composite is selected as the substrate instead of pure NWO ceramic.
研究领域:
材料科学
·
电磁工程
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Kuo Lun,Qianli Ma,Ming Yang,Xiangting Dong,Ying Yang,Jinxian Wang,Wensheng Yu,Guixia Liu
For the purpose of developing new-typed multifunctional composite microbelts, novel color-tunable composite microbelts endowed with simultaneously tuned electricity–magnetism performance have been successfully fabricated via facile one-pot electrospinning technology. The obtained trifunctional composite microbelts are composed of polymethyl methacrylate (PMMA) as the matrix, Tb(BA) 3 phen and Eu(BA) 3 phen (BA = benzoic acid, phen = phenanthroline) complex as luminescence materials, Fe 3 O 4 nanoparticles (NPs) as magnetic materials and polyaniline (PANI) as electrically conductive material. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), vibrating sample magnetometry (VSM), fluorescence spectroscopy and Hall effect measurement system are used to characterize the morphology, structure and properties of the [Tb(BA) 3 phen + Eu(BA) 3 phen]/PANI/Fe 3 O 4 /PMMA composite microbelts. The results indicate that the trifunctional composite microbelts possess excellent fluorescence, saturation magnetization and electrical conduction. The emitting color of the composite microbelts can be tuned by adjusting the mass ratios of Tb(BA) 3 phen, Eu(BA) 3 phen, Fe 3 O 4 and PANI in a wide color range of red–yellow–green under the excitation of 306-nm single-wavelength ultraviolet light. The electrical conductivity and saturation magnetization of the composite microbelts can be respectively tunable by adding various amounts of PANI and Fe 3 O 4 NPs. The trifunctional composite microbelts are expected to possess many potential applications in areas such as full-color display, electromagnetic shielding, molecular electronics, anti-counterfeit materials and biomedicine.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2023
·
IF 17.1
Kailian Dong,Hai Zhou,Wenlong Shao,Zheng Gao,Fang Yao,Meng Xiao,Jiashuai Li,Yongjie Liu,Shuxin Wang,Shun Zhou,Hongsen Cui,Minchao Qin,Xinhui Lu,Chen Tao,Weijun Ke,Guojia Fang
Lead halide perovskite single crystals have attracted wide interest in the field of X-ray detection due to their excellent photophysical properties. However, their inherent toxicity and high thickness restrict their applications in flexible devices. In this paper, designing a micronanometer-scale X-ray detector based on all-inorganic lead-free CsAg2I3 (CAI) single crystal microbelts (MBs) has addressed the above issues. These CAI single crystal MBs can be synthesized on various substrates with high crystal quality and excellent stability. Based on their excellent characteristics of the CAI MBs, we fabricate single CAI MB devices with an Au/CAI/Au structure, which shows not only good ultraviolet photoresponse characteristics, but also excellent X-ray detection performance. The optimized CAI photodetectors exhibit a responsivity of 23.59 mA/W, a high detectivity of 1010 Jones, and a fast response speed. For X-ray detection performance, a sensitivity of up to 515.49 μC Gyair–1 cm–2 and a detection limit of as low as 14.65 μGyair s–1 are achieved with outstanding operation stability and excellent long-term stability. Furthermore, our devices also showed excellent applicability for X-ray imaging, which is promising for their use in X-ray detection and imaging. Finally, flexible X-ray detectors are fabricated by using thin CAI single-crystal MBs and demonstrate good flexibility under different bending radii and bending cycles. Our work shows the potential for developing highly sensitive flexible integrated micro/nano optoelectronic devices by using lead-free perovskite analogue single crystals.
研究领域:
材料科学
·
光电子学
·
辐射探测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）