Advanced Science
·
2024
·
IF 14.3
Wenhao Li,Jichuang Shen,Yaqing Ma,Xiang Xu,Han Chen,Lida Yu,Chen Ji,Menglin He,Kezhao Ma,Yiwei Duo,Li Wang,Tongbo Wei,Liping Shi,Muhong Wu,Kaihui Liu,Huaze Zhu,Wei Kong
2D stacking presents a promising avenue for creating periodic superstructures that unveil novel physical phenomena. While extensive research has focused on lateral 2D material superstructures formed through composition modulation and twisted moiré structures, the exploration of vertical periodicity in 2D material superstructures remains limited. Although weak van der Waals interfaces enable layer-by-layer vertical stacking, traditional methods struggle to control in-plane crystal orientation over large areas, and the vertical dimension is constrained by unscalable, low-throughput processes, preventing the achievement of global order structures. In this study, a supercell multiplying approach is introduced that enables high-throughput construction of 3D superstructures on a macroscopic scale, utilizing artificially stacked single-crystalline 2D multilayers as foundational repeating units. By employing wafer-scale single-crystalline 2D materials and referencing the crystal orientation of substrates, the method ensures precise alignment of crystal orientation within and across each supercell, thereby achieving controllable periodicity along all three axes. A centimeter-scale 3R-MoS₂ crystal is successfully constructed, comprising over 200 monolayers of single-crystalline MoS₂, through a bottom-up stacking process. Additionally, the approach accommodates the integration of amorphous oxide, enabling the assembly of 3D non-linear optical crystals with quasi-phase matching. This method paves the way for the bottom-up construction of macroscopic artificial 3D crystals with atomic plane precision, enabling tailored optical, electrical, and thermal properties and advancing the development of novel artificial materials and high-performance applications.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF APPLIED PHYSICS
·
2024
·Vol. 135
·期 16
·
IF 2.7
Zhao Dongpeng,Li Jun,Bai Han,Wu Huantong,Chen Xiping,Sun Guangai,Zhou Zhongxiang
Consistent c -axis orientation characteristics toward the direction of applied pressure of Y -type BaSrCo 2 Fe 11 AlO 22 (BSCFAO- θ ) were successfully prepared by the strategy of hot pressing. The samples’ magnetoelectric coupling performance was greatly enhanced by the strategy of hot pressing than that of the traditional solid reaction method. The magnetoelectric current of BSCFAO- θ ( θ = 0°) (12.06 μ A/m 2 ) was nearly 5 times higher than BSCFAO- SS (2.24 μ A/m 2 ). The magnetoelectric polarization of BSCFAO- θ ( θ = 0°) (32.82 μ C/m 2 ) was nearly 4 times higher than that of BSCFAO- SS (8.31 μ C/m 2 ). The magnetoelectric coupling coefficients of BSCFAO- θ ( θ = 0°) (1880 ps/m) were nearly 4 times higher than those of BSCFAO- SS (404 ps/m). The enhancement of magnetoelectric polarization of BSCFAO- θ ( θ = 0°) can be attributed to the uniform c -axis orientation, which reinforced magnetoelectric polarization compared with none orientation that eliminated the magnetoelectric polarization on grain boundaries. The magnetoelectric coupling performance of BSCFAO- θ presented a gradually decreasing trend with the angle changing from 0° to 90° for the changing of orientation. Compared with traditional solid reaction methods, the strategy of hot pressing inhibits grain growth and increases grain boundaries, thus facilitating the enhancement of grain boundaries’ resistivity, and the electrical resistivity of BSCFAO- θ (3.08 × 10 10 Ω cm) was nearly 10 000 times higher than that of BSCFAO- SS (2.5 × 10 6 Ω cm), which also benefits the magnetoelectric polarization performance of BSCFAO- θ . Therefore, the hot-pressing strategy can contribute to the forming of oriented ceramics and enhance the grain boundaries’ resistivity to improve magnetoelectric coupling performance.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
SURFACE REVIEW AND LETTERS
·
2014
·
IF 0.367
LING ZHU,XUMING XU,YAN WANG,SHUYI LIU,JIE LING,LACHENG LIU,SHENG WEI,FENG CAI,ZHONGPING WANG,XIAOQING LIU,LI WANG
The assembled structures of triangular symmetrically shape molecules with three functional groups, trimesic acid (TMA) and melamine, have been investigated by scanning tunneling microscopy on Highly Oriented Pyrolytic Graphite (HOPG) in ambient. Hexagonal porous structures are formed by these molecules and the cavity of the assembled structure becomes bigger when larger molecules are used as building blocks. The cavity within the assembled structure formed by TMA is bigger enough to host guest molecule.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 46
·23388-23395
·
IF 9.931
Qihao Sun,Yadong Xu,Hongjian Zhang,Bao Xiao,Xin Liu,Jiangpeng Dong,Yuanbo Cheng,Binbin Zhang,Wanqi Jie,Mercouri G. Kanatzidis
The halide perovskitoid compound Cs3Bi2I9 (CBI) has attracted considerable interest as a semiconductor because of its outstanding stability and reduced toxicity compared with lead-based halide perovskites. Here, we report the growth of nuclear radiation detection grade CBI bulk crystals (Φ 15 × 60 mm3) with a high resistivity of over 1010 Ω cm using a modified vertical Bridgman method. Because of their layered crystal structures we investigated the anisotropy in the optical and electrical properties using different crystal orientations. The CBI(001) sample exhibits a resistivity of ∼1012 Ω cm compared to ∼1010 Ω cm for the CBI(100) sample. This is due to the anisotropic mobility in the two crystallographic directions. Using 425 nm LED (∼200 mW cm−2) illumination CBI(001) possesses a superior optical response with a switching ratio of over 40, which is critically higher than that of CBI(100) (<2). Detectors of 2 mm thickness show a capability of detecting 241Am@5.49 MeV α particles, with good peak discrimination. A full width at half maximum (FWHM) of 32% was obtained under a bias of 560 V. Simultaneously, the electron mobility and mobility lifetime (μτ) were calculated to be 6.10 cm2 V−1 s−1 and 2.03 × 10−5 cm V−1, respectively. First-principles density functional theory calculations confirm the crystallographic anisotropy of the carrier effective masses. In addition, a significant X-ray sensitivity of 111.9 μC Gy−1 cm−2 for a CBI detector was observed, under 80 kVp X-rays at an electrical field of 450 V cm−1.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2758
·
IF 3.1
Guang Xian,Tongxin Zheng,Yaqiu Tao,Zhigang Pan
LaFeO3thin films were successfully epitaxially grown on single-crystalline SrTiO3substrates by the one-step hydrothermal method at a temperature of 320 °C in a 10 mol/L KOH aqueous solution using La(NO3)3and Fe(NO3)3as the raw materials. The growth of the films was consistent with the island growth mode. Scanning electronic microscopy, elemental mapping, and atomic force microscopy demonstrate that the LaFeO3thin films cover the SrTiO3substrate thoroughly. The film subjected to hydrothermal treatment for 4 h exhibits a relatively smooth surface, with an average surface roughness of 10.1 nm. X-ray diffraction in conventional Bragg–Brentano mode shows that the LaFeO3thin films show the same out-of-plane orientation as that of the substrate (i.e., (001)LaFeO3||(001)SrTiO3). The in-plane orientation of the films was analyzed by φ-scanning, revealing that the orientational relationship is [001]LaFeO3||[001]SrTiO3. The ω-rocking curve indicates that the prepared LaFeO3films are of high quality with no significant mosaic defects.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 46
·期 10
·5877-5883
·
IF 1.579
Wang Yan,Han Jing,Guo Fu,Ke Xiaoxing
Grain orientations are a significant factor under high-density current stressing, but there are few literature reports about the influence of grain orientation on electromigration in composite solder joints. Most research relating to the electromigration behavior of composite solders have been carried out by adding different kinds of reinforced particles in order to relieve the electromigration phenomena, while the impacts of grain orientation on the electromigration have been neglected. In this paper, Sn-3.5Ag composite solder joints reinforced by 2 vol.% Cu were fabricated to investigate the effects of Sn grain orientation on electromigration. The one-dimensional single-grained solder joints were stressed under a constant current density of 10 4 A/cm 2 for different times at room temperature. The samples, of which the c -axis of the Sn grains was nearly parallel to the electron flow direction, exhibited serious electromigration-induced phenomena after current stressing for 528 h. However, electromigration was not observed in the samples where the Sn grains had their c -axis perpendicular to the electron flow direction. Therefore, the grain orientations have a great influence on the electromigration behavior in composite solders and Cu atoms moved faster along the c -axis of the Sn grains than along the a - and b -axes during current stressing.
研究领域:
材料科学
·
电子封装技术
·
金属材料学
·
微电子可靠性
·
物理冶金
✓ 已验证
DOI
高影响因子
Polymers
·
2017
·Vol. 9
·期 1
·1
·
IF 3.364
Yanhua Song,Zhaoyang Sun,Lan Xu,Zhongbiao Shao
In the electrospinning process, a modified parallel electrode method (MPEM), conducted by placing a positively charged ring between the needle and the parallel electrode collector, was used to fabricate highly aligned carbon nanotubes/polyacrylonitrile (CNTs/PAN) composite nanofibers. Characterizations of the samples—such as morphology, the degree of alignment, and mechanical and conductive properties—were investigated by a combination of scanning electron microscopy (SEM), transmission electron microscopy (TEM), universal testing machine, high-resistance meter, and other methods. The results showed the MPEM could improve the alignment and uniformity of electrospun CNTs/PAN composite nanofibers, and enhance their mechanical and conductive properties. This meant the successful preparation of highly aligned CNT-reinforced PAN nanofibers with enhanced physical properties, suggesting their potential application in appliances and communication areas.Keywords:carbon nanotubes;highly aligned;composite nanofibers;electrospinning
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Na Sun,Jiajia Sun,Xiaoliang Zeng,Peng Chen,Jiasheng Qian,Ru Xia,Rong Sun
Thermally conductive polymer composites are commonly used in thermal management field because of their wide range of utilization, ease of processing and low cost. However, conventional polymer composites usually suffer from an undesired enhancement of thermal conductivity . Herein, we report on boron nitride (BN) plates/polycarbonate composites in which BN plates are aligned via hot-pressing. Since the orderly arrangement of BN plates can provide pathways for phonon transport, the obtained composites possess a maximum thermal conductivity of 3.09 W m −1 K −1 along the aligned direction as the BN loading reaching 18.5 vol%. The thermal infrared characterization also indicates that BN/polycarbonate composites perform higher heating or cooling rate due to the good heat conduction capacity. This strategy can potentially pave the way for the design and preparation of highly thermally conductive and mechanically strong materials for thermal-management applications.
研究领域:
材料科学
·
热管理工程
✓ 已验证
产品关联
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2025
·
IF 5.1
Kang Ren,Juanqin Xue,Bin Liu,Heping Wang,Yongqiang Tian,Xue Han,Changbin Tang
Despite Ti 3 C 2 T x- based filler has gained enormous application in improving the anti-corrosion of epoxy coatings, it is still insufficient to achieve the quality standard to face long-term service conditions. In this work, a composite coating integrated with Ti 3 C 2 T x and epoxy resin was prepared, which was fabricated by functionalizing Ti 3 C 2 T x through a strong cationic poly (diallyl dimethyl ammonium) chloride (PDDA) electrostatic adsorption and ionic liquids (ILs) to improve the chemical stability, and then the functionalized Ti 3 C 2 T x was controlled to parallelly distributed in epoxy under the external electric field. Results showed that Ti 3 C 2 T x nanosheets fillers in the prepared epoxy coating exhibit a flat arrangement for resisting infiltration. After immersion in 3.5 wt% NaCl solution for 28 days, the low-frequency impedance modulus of the prepared PDDA-ILs@Ti 3 C 2 T x /EP coating was about 1–2 orders of magnitude compared to that of epoxy coating and was maintained above 10 8 Ω. cm 2 . Integrating the triple effect of the interfacial interaction, directional-aligned barrier effect and intelligent effect formed by ILs, it can provide new idea for developing MXene-based smart coating for the corrosion protection of oil and gas field pipelines steel.
研究领域:
材料科学
·
腐蚀防护
·
纳米复合涂层
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2014
·Vol. 26
·期 1
·369-376
·
IF 1.966
Wang Hongguang,Xiong Xinqian,Xu Jinbao,Wang Lei,Bian Liang,Ren Wei,Chang Aimin
Preferred (100)-oriented and complete (100)-oriented LaMn 0.6 Al 0.4 O 3 thin films were deposited on (100)-LaNiO 3 -coated silicon substrates by spin-coating method. Complex impedance spectroscopy was used to provide a convincing evidence for the existence of grain and grain boundary that were separated in the frequency domain in impedance spectrum. It suggests that the better grain orientation is effective in lowering the resistivity and activation energy but with little influenced on grain boundary. The analysis of impedance dependent on frequency, reveals that the relaxation is a thermally activation process. The grain and grain boundary conduction obey the Arrhenius behavior with activation energy 1.2294–1.3273 eV. The mechanism associated with the change of the electrical properties of the thin films is discussed.
研究领域:
材料科学
·
固体物理
✓ 已验证
DOI
高影响因子
Polymers
·
2024
·Vol. 16
·期 8
·1176
·
IF 4.7
Diansong Gan,Yuejun Liu,Tianhui Hu,Shuhong Fan,Lingna Cui,Guangkai Liao,Zhenyan Xie,Xiaoyu Zhu,Kejian Yang
The biaxially-oriented PA56/512 has excellent mechanical strength, extensibility and water–oxygen barrier properties and has broad application prospects in green packaging, lithium battery diaphragm and medical equipment materials. The correlation between the aggregation structure evolution and macroscopic comprehensive properties of copolymer PA56/512 under biaxial stretching has been demonstrated in this work. The structure of the random copolymerization sequence was characterized by13C Nuclear magnetic resonance (NMR). The typical isodimorphism behavior of the co-crystallization system of PA56/512 and its BOPA-56/512 films was revealed by differential scanning calorimetry (DSC) and X-ray diffraction (XRD) tests. And the aggregation structure, including the hydrogen bond arrangement, crystal structure and crystal morphology of PA56/512 before and after biaxial stretching, was investigated by XRD, Fourier-transform infrared spectroscopy (FTIR) and polarized optical microscopy (POM) tests. Furthermore, the effect of the biaxially-oriented stretching process on the mechanical properties of PA56/512 has been demonstrated. In addition, a deep insight into the influence of the structure on the crystallization process and physical–mechanical performance has been presented. The lowest melting point at a 512 content of 60 mol% is regarded as a “eutectic” point of the isodimorphism system. Due to the high disorder of the structural units in the polymer chain, the transition degree of the folded chain (gauche conformation) is relatively lowest when it is straightened to form an extended chain (trans conformation) during biaxially-oriented stretching, and part of the folded chain can be retained. This explains why biaxially stretched PA56/512 has high strength, outstanding toughness and excellent barrier properties at the pseudo-eutectic point. In this study, using the unique multi-scale aggregation structure characteristics of a heterohomodymite polyamide at the pseudo-eutectic point, combined with the new material design scheme and the idea of biaxial-stretching processing, a new idea for customized design of high-performance multifunctional polyamide synthetic materials is provided.
研究领域:
材料科学
·
高分子化学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Wenfang Cui,Mei Ma,Yongmei Sun,Qingwen Fan,KeYu Zhang,Chengcheng Shi
TiP 2 O 7 is a lithium-ion batteries anode material with outstanding stability and high safety due to its strong polyanion three-dimensional frame structure. However, poor electrical conductivity severely represses the rate capability of TiP 2 O 7 anode. Herein, a porous TiP 2 O 7 /nitrogen-doped carbon (CN) composite with tailored (6 3 0) and (6 0 0) preferential crystallographic orientation is achieved by the ball-milling and thermal treatment strategy. The TiP 2 O 7 /CN (6 3 0) anode retains specific capacities of 194.3 and 128.9 mA h/g at high current densities of 5 and 10 A/g, respectively, superior than that of the TiP 2 O 7 /CN (6 0 0). Remarkably, kinetic analysis reveals that the charge storage process in the TiP 2 O 7 /CN (6 3 0) anode is predominantly diffusion-controlled, with the diffusion-controlled capacity contributing up to 52 % even at a high scan rate of 2 mV/s. Density functional theory calculation confirms the lower lithium ions migration energy barrier of (6 3 0) crystallographic orientation of TiP 2 O 7 . In addition, due to the homogeneity of porous structure and composition, the TiP 2 O 7 /CN (6 3 0) anode maintains a capacity of 389mA h/g after 1000 cycles at 1 A/g. Thereby, the synthesis strategy for preferred orientation TiP 2 O 7 -based anode is instructive for the structural design of high-rate metal-based composite oxides for lithium-ion batteries.
研究领域:
材料科学
·
电化学
✓ 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）