Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 9
·3967-3976
·
IF 9.931
Yu-Jie Gao,Mei-Ling Feng,Bo Zhang,Zhao-Feng Wu,Ying Song,Xiao-Ying Huang
It is of vital importance to capture 137Cs+ and 90Sr2+ from solutions for radionuclide remediation due to their hazardous nature and long half-life. Although metal organic framework (MOF) materials have been greatly developed, the studies of their application in the capture of radioactive cations remain rare. Especially, the capture mechanism has not been clarified. Here, we present a new In-MOF material with the potential for remediation of radioactive Cs+ and Sr2+ ions by ion exchange, namely, [Me2NH2][In(TDC)2]·1.5DMA·1.5H2O (FJSM-InMOF; H2TDC = 2,5-thiophenedicarboxylic acid and DMA = N,N′-dimethylacetamide). It possesses an anionic framework of [In(TDC)2]nn− charge balanced by dimethylammonium cations. It could be easily synthesized via a one-pot solvothermal route. Remarkably, it showed excellent β and α radiation-resistances, high exchange capacities (qCsm = 198.63 mg g−1; qSrm = 43.83 mg g−1), impressive selectivity (KCsd = 7.50 × 104 mL g−1; KSrd = 9.49 × 105 mL g−1), high ion-exchange efficiency (RSr = 99.89%; RCs = 99.63%) and the ability of convenient elution with low cost. In particular, the ion exchange mechanism was illuminated by an unprecedented observation of the single-crystal to single-crystal structural transformation in the Cs+-exchange process. This work paves the way to develop highly efficient and environmentally friendly MOFs for the selective capture of radionuclides.
研究领域:
环境科学
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材料科学
·
核化学与放射化学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2020
·Vol. 10
·期 8
·698
·
IF 2.404
Mengdi Fan,Guangda Wu,Fapeng Yu,Lili Li,Yanlu Li,Xiufeng Cheng,Xian Zhao
The bismuth layer-structured ferroelectrics (BLSFs) materials have potential for high-temperature piezoelectric applications. Among these piezoelectric materials, the CaBi4Ti4O15(CBT) piezoelectric ceramic with a high decomposition temperature of about 1250 °C attracts a lot of attention. Achieving a CBT single crystal is a significant way to improve its piezoelectric properties. For this purpose, the flux system for growing CBT crystal was explored in this study. The optimum flux composition ratio was found to be PbO:B2O3:CBT = 3:3:1 in mol%, where the PbO–B2O3mixtures were used as a flux system. Millimeter size flake-shaped CBT crystals were obtained using the spontaneous growth process for the first time. The relationship between the crystal structure and flake growth habit was analyzed. In addition, the bandgap was evaluated by the combination of transmittance spectrum and first-principle calculations. Besides, the piezoelectric property was predicted from the perspective of polyhedral distortion, which indicated the potential of CBT crystal for piezoelectric applications.Keywords:CaBi4Ti4O15;single crystal growth;flux method;dipole moments
研究领域:
材料科学
·
晶体学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2020
·Vol. 10
·期 9
·733
·
IF 2.404
Qixiang Wang,Hong Fang,Di Wang,Jie Wang,Nana Zhang,Bin He,Weiming Lü
The fabrication and transfer of freestanding single-crystal ferroelectric membranes deserve intensive investigations as to their potential applications in flexible wearable devices, such as flexible data storage devices and varied sensors in E-skin configurations. In this report, we have shown a comprehensive study approach to the acquisition of a large-area freestanding single-crystal ferroelectric BaTiO3by the Sr3Al2O6scarification layer method. By controlling the thickness of the BaTiO3and Sr3Al2O6, the exposed area of the Sr3Al2O6interlayer, and the utilization of an additional electrode La2/3Sr1/3MnO3layer, the crack density on the freestanding BaTiO3can be dramatically decreased from 24.53% to almost none; then, a more than 700 × 530 μm2area high-quality freestanding BaTiO3membrane can be achieved. Our results offer a clear and repeatable technology routine for the acquisition of a flexible large-area ferroelectric membrane, which should be instructive to other transition metal oxides as well. Our study can confidently boost flexible device fabrication based on single-crystal transition metal oxides.Keywords:crack density;ferroelectrics;freestanding;single crystal
研究领域:
材料科学
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柔性电子学
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产品关联
DOI
高影响因子
Nanoscience and Nanotechnology Letters
·
2015
·Vol. 7
·期 5
·398-401
·
IF 1.431
Wang Shanshan,Zhang Jun,Peng Feng,Shao Lexi
Micron-sized Cu2FeSnS4 single crystals were synthesized by molten salt method using CuS, FeS and SnS as raw materials and using CsCl as fluxing agent for the first time. The Cu2FeSnS4 single crystals were investigated by X-ray diffraction,
Raman, X-ray photoelectron spectroscopy and UV-vis absorbance spectroscopy. The results showed that the Cu2FeSnS4 single crystals were having stannite structure with an average size about 50–100 μm and the band gap was about 1.45 eV.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2025
·
IF 4.7
Wenzhi Su,Mengyu Zhang,Chuancheng Zhang,Yong Zou,Wenpeng Liu,Shoujun Ding
Upconversion (UC) fluorescence intensity ratio (FIR) technology has emerged as a promising approach for optical thermometry due to its ability to provide non-contact, high-precision temperature measurements. Unlike conventional UC phosphor-based systems, single-crystal UC materials offer enhanced responsiveness and sensitivity for thermal detection, thanks to their structural stability and superior thermal conductivity. In this study, we successfully synthesized an Yb 3+ , Ho 3 ⁺:NaBi(MoO 4 ) 2 (NBM) single crystal with exceptional optical quality using the Czochralski (Cz) growth technique. Comprehensive structural characterization was carried out using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). The results confirmed that Yb 3+ , Ho 3+ :NBM crystallizes in a tetragonal structure with the space group I4 1 /a. The emission of different visible light colors under various excitation wavelengths was found to be due to the multiphonon relaxation process. Systematic analysis of power-dependent up-conversion emission spectra conclusively showed that the green and red up-conversion emissions arise from two-photon excitation processes. Moreover, temperature-dependent spectral evolution in the range of 300–500 K was quantitatively analyzed, allowing the calculation of both absolute sensitivity ( S ₐ) and relative sensitivity ( S ᵣ) parameters to evaluate the material's optical thermometric performance. These findings highlight the promising potential of Yb 3+ , Ho 3+ :NBM single crystal for developing high-performance optical thermometry devices.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Progress in Natural Science-Materials International
·
2024
·
IF 4.8
Min Dong,Qingya Sun,Zhihua Wang,Zixin Rui,Zhe Zhang,He Zhu,Si Lan
Layered LiNi x Co y Mn z O 2 (NCM) cathode materials have emerged as the best choice for high-energy-density lithium-ion batteries for powering electric vehicles. Despite significant research efforts, the understanding of complex structural dynamics during lithium (de-) intercalation still remains a subject of debate, especially in scenarios where morphology and composition vary. In this study, we carried out in situ high-energy synchrotron X-ray diffraction experiments on commercial NCM523 cathode materials in both single crystal and polycrystalline forms to probe the structural changes during charging and discharging in detail. Our findings reveal that both single crystal and polycrystalline materials exhibit typical H1–H2–H3 phase transitions. However, in polycrystalline NCM532, a monoclinic intermediate phase emerges between the H1 and H2 phases. During this process, symmetry reduces from R -3 m to C 2/ m , which is attributed to a shear distortion along the ab plane. In contrast, for single crystal materials, the H1 phase directly transforms into the H2 phase without the monoclinic phase. The observed monoclinic distortion significantly impacts structural stability and material cycling performance. This study provides new insight into the structural dynamics in NCM532 cathode materials, particularly concerning morphology-dependent behaviors, which could deepen our understanding of the relationship between NCM material structures and their performance.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Jianxu Ding,Songjie Du,Xiaohua Cheng,Lin Jing,Ying Zhao,Zhiyuan Zuo,Hongzhi Cui,Xiaoyuan Zhan
Organic-inorganic hybrid methylammonium lead iodide perovskite (MAPbI 3 ) is considered as new generation optoelectronic material. MAPbI 3 single crystal is proved more excellent than its polycrystalline film and nano state counterparts, though the discrepancy is still pending. Referring MAPbI 3 single crystal applications, physical anisotropy stands in its breach. However, it has not been drawn enough attentions till now. In this study, taking advantages of the natural exposed (100) and (112) facets of MAPbI 3 single crystal grown from γ-butyrolactone (GBL) solution, the anisotropic optoelectronic performances based on of these two lattice planes were systematically explored through planar metal-semiconductor-metal (MSM) devices. An order enhanced photocurrents , 135% increased responsivity, and 128% heightened EQE on (112) plane device than those on (100) plane device under 5 V bias with irradiation power of 1 mW, remarkably demonstrated that (112) plane was more excellent in optoelectronic performances and light harvesting capability.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 42
·8113-8118
·
IF 4.034
Liao Chen,Tao Ye,Xinyi Jin,Jie Ren,Boning Huang,Zhi-Kang Xu,Hongzheng Chen,Hanying Li
Crystallization in gel media has been occasionally found to result in single crystals with gel networks incorporated inside, extending the gel method with a long history for crystallization into a platform to design the internal composite structures of a crystal. The limited number of gel-incorporated crystals has inspired the investigation on how general gel incorporation is. Crystallization in gels through decomplexation has been widely used to grow crystals with extremely low water solubility, while whether the gel networks are incorporated inside these crystals has not been studied. In this work, crystals of AgCl, AgI and CuCl have been grown in both agarose gels and silica gels by decomplexation. The crystallographic structures of the crystals were identified by powder and/or single X-ray diffraction. The internal hybrid structures were studied by examining the residue materials after gentle etching and complete dissolution of the crystals. When grown from agarose gels containing self-assembled fibrous structures, gel networks were incorporated into single crystals of all the three compounds. In sharp contrast, the gel networks were pushed away when the crystals were grown in silica gels. The discrepancy between the crystals grown from agarose gels and those from silica gels is consistent with the effect of gel strength on gel incorporation. This work may help to harvest gel-incorporated crystals.
研究领域:
晶体学
·
材料科学
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2022
·Vol. 25
·期 1
·95-107
·
IF 3.756
Lei Wang,Xudong Liu,Jinsheng Li,Mu Zhang,Xiaoguo Bi,Zhixin Ma,Jialin Chen,Xudong Sun
High-performance dielectric materials are essential components of electronic devices. In this work, RE-doped SrTiO3 (RE = La, Nd, Yb) single crystals with excellent dielectric properties were prepared by the Verneuil method. For La-STO and Nd-STO, the RE ions are substituted for Sr2+ only, and the excellent dielectric properties are mainly caused by defect dipoles associated with oxygen vacancies including and defect dipole clusters. For Yb-STO, Yb3+ partially replaces Ti4+, forming an additional defect dipole , resulting in the best dielectric properties (ε′ = 3.6 × 104, tan δ = 0.0036 under 1 kHz). In addition, N2 atmosphere treatment promotes the production of oxygen vacancies and Ti3+ and the formation of more defect dipoles, thus further optimizing the dielectric properties of Yb-STO (ε′ = 4.9 × 104, tan δ = 0.004 under 1 kHz). This work suggests that the dielectric properties of RE-doped SrTiO3 materials are closely related to oxygen vacancies, and the simultaneous substitution of Sr2+ and Ti4+ should enable obtaining dielectric properties superior to those of the substitution of Sr2+ only. The present work provides a clearer understanding of the origin of SrTiO3 dielectric properties, which is of great significance to the development of SrTiO3-based dielectric materials.
研究领域:
材料科学
·
凝聚态物理
·
电子器件
✓ 已验证
DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2022
·
IF 4.01
Zeyu Cheng,Hao Ren,Yazhao Wang,Shengdi Ta,Peng Zhang,Yuhua Yang,Shoulei Xu,Bernard Albert Goodman,Wen Deng
Large-size and high-quality stable ZrO2 single crystals containing x mol % Yb2O3 (x = 7, 8, 9, 10) (denoted as xYbSZ), and 8YbSZ crystals doped with 0.5 mol % Er2O3 were grown by the optical floating zone (OFZ) method. Yb3+ was indicated by XRD and Raman spectroscopy to have successfully entered into the ZrO2 lattice, which was stabilized in the cubic phase when the concentration of Yb2O3 was ≥8 mol %. Er3+ successfully entered the 8YbSZ lattice, and its spectral absorption intensity was enhanced compared to Er3+ in the corresponding yttria-stabilized zirconia (8YSZ), thus demonstrating that the Yb3+ ion has an excellent sensitizing effect on the up-conversion luminescence of Er3+. Fluorescence decay curves show that the up-conversion luminescence excited state lifetime of Er3+ is significantly enhanced in 8YbSZ compared to 8YSZ. Thus, these results demonstrate that Yb3+ ions not only successfully stabilize ZrO2 in the cubic phase structure but also maintain their role as an up-conversion luminescence sensitizer for Er3+ ions.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
HIGH PRESSURE RESEARCH
·
2018
·
IF 1.925
Yunxia Han,Shanmin Wang,Yinjuan Liu,Dejiang Ma,Duanwei He,Yusheng Zhao
As a new member in the family of Mott system, perovskite PbCrO3 has recently been uncovered to exhibit fantastic structural transition under pressure, coupled with magnetic, electronic, and ferromagnetic transitions, which provide many opportunities for understanding of correlated system. However, it is still challenging to synthesize high-quality single-crystal PbCrO3, leading to the limited exploration of this Mott compound. In this work, we formulate a new high-pressure reaction route for preparation of high-quality PbCrO3 crystals between PbCl2 and Na2CrO4 at high pressure of 5–10 GPa and at high temperature of 750–1500°C. Because of the formation of reaction byproduct NaCl, the final product can readily be separated by washing with water. The obtained sample is in the form of single crystal with crystallite size up to 200 μm. In addition, combined with X-ray diffraction measurement, a tentative pressure-temperature synthesis diagram of PbCrO3 is mapped out from the reaction between PbCl2 and Na2CrO4 and the reaction mechanism is also explored in detail.
研究领域:
材料科学
·
凝聚态物理
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2017
·
IF 4.536
Zhan Zhang,Lixia Ren,Hong Yan,Shujin Guo,Shuanhu Wang,Min Wang,Kexin Jin
Single crystals of heterovalent Bi-doped CH3NH3PbCl3 perovskite have been successfully grown through the inverse temperature crystallization method. Bandgap narrowing of 300 meV (a 55 nm red-shifting absorption edge) is obtained for the nominal 20% Bi-doped crystal with the host structure and the energy at the top of the valence band invariable. It is observed that the contact between the Au electrodes and single crystals transforms from Ohmic to Schottky, and the conductivity increases with increasing Bi doping level. By contrast, the Bi-doped CH3NH3PbCl3 thin films are also prepared, and the similar bandgap narrowing is found, although the narrowing degree is less than that in single crystals. This work has a comprehensive understanding of Bi-doped single crystals and thin films, providing further optoelectronic applications for these promising solution-processed hybrid perovskite semiconductor materials.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）