CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Lisha Zhang,Yudong Ji,Weidong Li,Bing Zhang,Qiang Ma,Bowen Qin,Yilei Zhang,Dan Yue,Zhenling Wang
Lanthanide ions-doped fluoride nanocrystals have excellent application prospect. However, low photoluminescence quantum yield (PLQY) is usually along with lanthanide ions-doped fluoride nanocrystals owing to their low molar absorptivity and narrow absorption band . In order to increase the absorption cross section of Ln 3+ in fluoride nanocrystals, a facile synthesis strategy to enhance luminescence of AF 2 : Ln 3+ (A = Ca, Sr; Ln = Eu, Tb) by the use of carbon dots (CDs) has been developed in this work. A series of characterizations including TEM , XRD , FTIR and XPS demonstrated that the CDs have been successfully combined with the surface of AF 2 : Ln 3+ nanocrystals. The combination of CDs has little influence on the microstructure and phase structure of AF 2 : Ln 3+ , and CDs@AF 2 : Ln 3+ nanocrystals have uniform and regular shape with cubic phase. CDs are used as a broadband sensitizer and lead to the broadband excitation of Ln 3+ , resulting in the enhancement around 10-fold of Ln 3+ luminescence emission in AF 2 : Ln 3+ nanocrystals after CDs combination. The corresponding PLQY increases almost three times, and the luminescence enhancement mechanism by combining CDs is proposed. In addition, the CDs@AF 2 : Ln 3+ nanocrystals are used to prepare CDs@AF 2 : Ln 3+ /PVA films, which exhibits excellent luminescence properties under the excitation of UV light . This work provides a superior method for enhancing the luminescence properties of lanthanide ions-doped nanocomposites and demonstrates practical potential as promising candidates for light-converting thin films .
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ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Chen Wang,Xing-Jing Zhang,Li−Na Zhao,Ting Zhang,Feng-Ying Bai,Li-Xian Sun,Yong-Heng Xing
The abuse and excessive discharge of organic pollutants such as nitroaromatic compounds (NACs) have become a hot topic of concern for all humanity and society, and the development of fast, effective, and targeted technical means for detecting NACs also faces many challenges. Here, we reported a strontium-based metal–organic framework (MOF) {[Sr2(tcbpe)(H2O)4]}n (Sr-tcbpe), in which tcbpe represents deprotonated 4′,4‴,4″‴,4‴‴-(ethene-1,1,2,2-tetrayl)tetrakis(([1,1′biphenyl]-4-carboxylic acid)). In Sr-tcbpe, Sr–O polyhedron and deprotonated tcbpe4– ligand have a staggered connection to form a self-assembled three-dimensional network structure. In addition, it is found that Sr-tcbpe undergoes no luminescent color change when grinding under solvent protection, while mechanochromic fluorescence behavior is observed when grinding directly, leading to luminescent color changes from cyan to green (Sr-tcbpe-G). Additionally, Sr-tcbpe and Sr-tcbpe-G could selectively detect PNP, DNP, and TNP, and Sr-tcbpe achieves visual fluorescence sensing detection toward TNP at a limit of detection as low as 2.25 μM. Moreover, during the detection process, unexpectedly, TNP exhibits a selective etching effect on Sr-tcbpe, which could drill nano holes with different sizes on the surface area of MOF materials to a certain extent, achieving the conversion of chemical energy to mechanical energy. In addition, the successful preparation of a portable sensor Sr-tcbpe@gypsum block provides a platform for the perfect combination of mechanochromic fluorescence behavior and visualization detection toward TNP. It lays the foundation for the practical application of MOF materials in daily life.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 26
·1-18
·
IF 2.8
Liang Xiaolu,Wang Zhenyu,Chen Zihao,Jiang Jiabin,Han Jiamei,Wang Yao,Wang Haitao,Pan Zimeng,Sun Jiankun,Ma Jun,Jiang Xuexing,Peng Jubo,Liu Xiang,Gu Xin
Perovskite manganite oxides have attracted considerable attention due to their strong electronic correlation. However, their practical application is challenged by high manufacturing costs and inferior electrical properties. In this study, the sol–gel method was employed to precisely control the Sr content in La 1− x Sr x MnO 3 (LSMO, x = 0.175, 0.195, 0.215, and 0.235) polycrystalline ceramics, the relationship between doping levels and electrical transport properties was systematically investigated. The results show that substituting La 3+ with Sr 2+ can effectively tune the electrical transport properties of LSMO ceramics. X-ray diffraction analysis indicates that all samples exhibit a single-phase perovskite structure with no secondary phases detected. Scanning electron microscopy images reveal that the sample surfaces have good grain connectivity, with grain size increasing as the Sr doping level increases. The resistivity–temperature curves of the samples were measured using the standard four-probe method, and significant differences of electrical transport properties were observed within the range of Sr doping studied. Notably, when the Sr doping level is x = 0.195, the temperature coefficient of resistivity ( TCR ) value of LSMO ceramics increases significantly to 10.3% K −1 at the peak TCR temperature ( T k ) of 296.3 K. In summary, these results offer a theoretical basis and guidance for future development of highly sensitive uncooled infrared bolometers.
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CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Zhiyuan Pan,Sihan Feng,Fan Li,Xuejiao Wang,Qi Zhu,Ji-Guang Li
Near-infrared phosphor converted light-emitting diodes (NIR pc-LEDs), as a state-of-the-art type of NIR sources, are finding multifaceted applications, where phosphor is a crucial component. In hope to provide new choices for NIR lighting, we synthesized in this work the two series of Ruddlesden -Popper type layered perovskite phosphors of SrLa 2 Al 2- x O 7 : x Cr 3+ ( x = 0–0.02) and SrLa 2- y Gd y Al 1.984 O 7 :0.016Cr 3+ ( y = 0–2), followed by detailed structure and luminescence investigation. SrLa 2 Al 2- x O 7 : x Cr 3+ was found to emit ∼700–800 nm NIR light under UV excitation and be able to maintain ∼54.3 % of its room temperature intensity at 423 K, which is remarkably higher than those (∼25–30 %@423 K) of the Mn 4+ activated perovskite NIR phosphors. Luminescence regulation was achieved by substituting La 3+ with Gd 3+ , and it was revealed that Gd 3+ may act as a sensitizer to significantly enhance Cr 3+ luminescence (∼346 % at 77 K) through Gd 3+ → Cr 3+ energy transfer, which was confirmed by spectral and fluorescence lifetime analysis. The observed spectral features and the influence of Gd 3+ were rationalized by considering crystal structure, local coordination, and crystal field. Finally, an NIR pc-LED device showing strong ∼700–900 nm luminescence was fabricated to show potential application of the phosphor in night vision and plant lighting.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Lixia Chen,Nan Wang,Qiuhua Ma,Qiuling Chen
Sm 3 + /Sr 2+ -co-doped Bi 5 FeTi 3 O 15 (BFTO) nanocrystals were hydrothermally synthesized and embedded into a TeO 2 -based magneto-optical (MO) matrix using a melt-quenching technique. original BFTO nanocrystals exhibited 30–50 nm- hexagonal platelet-like morphology, which reduced to 20–35 nm after Sm 3+ /Sr 2+ doping due to lattice distortions and strain effects. The X-ray diffraction confirmed the crystal structure, while Raman and X-ray photoelectron spectra revealed charge redistribution and local asymmetry. Critically, Electron Paramagnetic Resonance analysis directly confirmed the presence of increased oxygen vacancies. These combined factors enhance the nonlinear optical (NLO) and chiroptical responses. The optimized 2 mol% Sm 3+ /Sr 2+ - Bi 5 FeTi 3 O 15 doped BFSS2 showed the highest third-order nonlinear susceptibility (χ (3) = 8.44 × 10 −11 esu), nonlinear refractive index (n₂ = 5.82 × 10 −10 m 2 /W), and nonlinear absorption coefficient (α 3 = 4.5 × 10 −11 m/W), demonstrating strong two-photon absorption (TPA) and Kerr nonlinearity. Photoluminescence spectra exhibited intense red emission at 610 nm and 645 nm, with BFSS2 achieving the highest circulary polarized luminescence (CPL) dissymmetry (g lum = −0.85) due to enhanced electric dipole –magnetic dipole interactions. Magnetic circularly polarized luminescence (MCPL) was significantly enhanced by Fe 2+ /Fe 3+ charge transfer and spin-orbit coupling. BFSS2 also exhibited the highest saturation magnetization (M s = 28 emu/g) and Verdet constant (28.3 rad/T·m at 633 nm), confirming strong magneto-chiral effects. These findings highlight the synergy of structural asymmetry, charge redistribution, and MO coupling in optimizing CPL, MCPL, and NLO properties, making BFSS2 a promising candidate for chiral photonic and magneto-optical applications.
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ADVANCED POWDER TECHNOLOGY
·
2017
·
IF 2.659
Qing Hu,Weihui Jiang,Xiaofeng Chen,Yuli Li,Qiming Liang
We synthetized a series of strontium-substituted submicron bioactive glasses spheres (Sr-SBG, SiO 2 -P 2 O 5 -CaO-SrO) in which strontium was substituted for calcium on a mole percentage basis, then investigated the effect of strontium-substituted amount on morphologies, physicochemical properties, apatite-forming bioactivity of SBG and evaluated the proliferation, differentiation and mineralization of Sr-SBG with different strontium substitution amounts by co-cultured with human dental pulp cells (HDPCs). Results showed that Sr-SBG with different strontium substitution amounts were successfully fabricated and substituting different strontium amounts did not affect the morphology and particle size of SBG. All the Sr-SBG possessed good apatite-forming ability, but substituting a certain amount of strontium for calcium would weaken the apatite-forming ability of SBG. Additionally, all the Sr-SBG extractions promoted proliferation, early odontogenic differentiation and mineralization of HDPCs, however, the cell proliferation, differentiation and mineralization abilities would be reduced when the substituted amount of strontium was excess (15 mol%). This study suggests that Sr-SBG with moderate strontium substitution amounts can be used as a more promising biomaterial for dental repair.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 25
·1-8
·
IF 2.8
Hu Zhilong,Liu Hongbo,Tang Jian Guo,Lee Soo Wohn,Li Jun
NaNbO 3 (NN) has potential applications in energy storage devices due to its antiferroelectricity and environmentally friendly characteristics, but its low dielectric breakdown field strength ( E b ) and energy storage efficiency ( ƞ ) limit practical applications. In this study, the structure and electrical characteristics of NaNbO 3 were modulated by introducing Sr(Mg 1/3 Nb 2/3 )O 3 (SMN) to optimize its energy storage performance. The (1- x )NN- x SMN solid solution was synthesized using a classic solid-state reaction approach. According to X-ray diffraction analysis results, the prepared ceramics exhibit a pure phase when x is less than or equal to 0.15. With the increment of x , SMN disturbs the long-range polar order, induces pronounced relaxation ferroelectric phase (RFE) with reduced remnant polarization ( P r ), and enhances E b , leading to significant increases in recoverable energy storage density ( W rec ) and η . The optimized composition 0.875NN-0.125SMN has the best dielectric energy storage properties with a W rec of 1.28 J/cm 3 and an η of 88%.
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SOLID STATE IONICS
·
2022
·
IF 3.699
Tianxiang Ning,Yanzhi Zhang,Qian Zhang,Xuefeng Shen,Yinyi Luo,Taoyong Liu,Piao Liu,Zhiwei Luo,Anxian Lu
In this study, Ta single-doped Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (Ta 0.6 ) and a series of Ta, Sr co-doped Li 6.4+x La 3-x Sr x Zr 1.4 Ta 0.6 O 12 (Ta 0.6 Sr x , x = 0.1, 0.2, 0.3, and 0.4) electrolytes are synthesized via a two-step process. The XRD result reveals that all samples have a pure cubic phase, which indicates that Ta 5+ and Sr 2+ can enter the lattice of LLZO and stabilize the cubic phase. The SEM images exhibit that all samples have a dense microstructure and tight grain boundary without obvious holes. The excellent properties are achieved when the doping amount of Sr reaches 0.2 mol. Among all designed samples, the Ta 0.6 Sr 0.2 has the highest Li + conductivity and relative density of 8.54 × 10 −4 S cm −1 and 98.79%, respectively, as well as the lowest activation energy roughly 0.302 eV. Additionally, the symmetrical cell's galvanostatic cycling data show that it has excellent cycling performance and extremely low overpotentials even after 350 cycles, indicating that it can be successfully applied to next-generation all-solid-state lithium-ion batteries (ASSLIBs).
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ECS Journal of Solid State Science and Technology
·
2018
·Vol. 7
·期 6
·N96
·
IF 1.808
Xiao Liu,Huiling Du,Jing Shi,Huicong Hu,Xingchen Hao
Recently, ferroelectrics of Bi0.5Na0.5TiO3 (BNT) based perovskite-structured oxides that exhibit ionic conductive grain have attracted great attention, and been proved to be highly dependent on the chemical composition. Herein, effects of Sr and Ga acceptors co-doping on the impedance characteristics and electric properties of non-stoichiometric BNT ceramics were studied. It indicates that the conductivity of BNT ceramics is significantly improved after introducing a certain amount of Sr and Ga, where the grain conductivity and grain boundary conductivity can be clearly distinguished. The inhomogeneity is reflected in which the acceptors preferentially diffuse along the grain boundaries with the change in activation energy. The conductivity could be influenced associated with dopant-vacancy defect complexes as the increasing of dopant content and sintering time. Ionic dominated conductive properties easily mixed with electronic contribution can be derived at different atmospheres. The degree of diffuseness and relaxation are enhanced monotonically with dopant concentration that revealed by a modified Curie-Weiss law at the high frequency.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Feihu Li,Ying Tang,Jie Li,Weishuang Fang,Laiyuan Ao,Yu Wang,Xiangguang Zhao,Liang Fang
AGe 4 O 9 (A = Ba, Sr) ceramics with hexagonal structure were fabricated by solid-phase reaction. BaGe 4 O 9 sintered at 1060 °C had low ε r ∼9.8, high Q × f ∼78,400 GHz and τ f ∼ -44.2 ppm/°C, whilst SrGe 4 O 9 sintered at 1100 °C exhibited relatively high ε r ∼11.2, low Q × f ∼62,500 GHz and near-zero τ f ∼ -11.7 ppm/°C. The τ f of SrGe 4 O 9 was nearer to zero than that of BaGe 4 O 9 due to the smaller τ ε value and the smaller distortion of the [GeO 6 ] octahedrons. The ‘rattling’ cations at A-site contribute to comparatively high ε r , low Q × f and near-zero τ f values in Sr 1- x Ba x Ge 4 O 9 ceramics. This work presents a new idea of adjusting the microwave dielectric performance (MDP) of ceramics by changing the strength of the rattling effect at A-site.
研究领域:
材料科学
·
无机化学
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2026
·
IF 5.9
Han-jun Qin,Si-ying He,Shu-bi Zhao,Ting-hui Xiao,Feng-ting Cui,Ling-Yu Zhang,Gao-yang Chen,Jing-yu Chen,Da-mao Dai,Xue-yan Liu,Xin-jia Hu
Infectious bone defects (IBD), characterized by persistent bacterial infection and impaired bone regeneration, remain a major clinical challenge. Although numerous biomaterials have been developed, most fail to simultaneously achieve antibacterial efficacy and osteogenic promotion. Here, we innovatively designed a strontium ion (Sr²⁺)-coordinated asiatic acid/silk fibroin (AA-Sr/SF) composite hydrogel that synergistically integrates a natural bioactive compound, inorganic ions, and a protein matrix. This unique strategy endows the hydrogel with dual antibacterial and osteoinductive functions. Systematic characterization demonstrated its excellent mechanical stability, controlled degradability, and sustained release behavior. Functional assays revealed that AA-Sr/SF effectively inhibited Staphylococcus aureus while significantly enhancing osteoblast differentiation. In vivo, the hydrogel reduced bacterial burden in infected defects, facilitated new bone formation, and restored bone mass. Transcriptomic analysis further suggested that AA-Sr/SF promotes osteogenesis via activation of the BMP4–ID2/ID3 axis and calcium signaling pathway. Collectively, this study introduces a multifunctional hydrogel integrating antibacterial, osteogenic, and translational advantages, offering a promising material-based strategy for the precise treatment of infectious bone defects.
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高影响因子
INORGANIC CHEMISTRY
·
2026
·
IF 4.6
Yu Qiu,Haonan Liu,Yujie Zhang,Hongping Wu,Hongwei Yu
The rational design of noncentrosymmetric (NCS) borates remains challenging because subtle variations in the arrangement of microscopic functional units can profoundly influence macroscopic symmetry and nonlinear optical (NLO) behavior. Herein, we report two new alkaline-earth borate fluorides, Sr2Mg3(BO3)2F4 and Ba2Mg3(BO3)2F4, featuring identical [BO3] triangles and Mg-O/F polyhedra, but crystallizing in distinct space groups, namely P1̅ for Sr2Mg3(BO3)2F4 and Fdd2 for Ba2Mg3(BO3)2F4. Structural analysis indicates that replacing Sr2+ with the larger Ba2+ cation modifies the local coordination environment around the alkaline-earth cation and the distortion of the Mg-O/F framework, which results in the reorganization of [BO3] units from an antiparallel arrangement to a cooperative polar alignment. Property measurements indicate that Ba2Mg3(BO3)2F4 exhibits a significant second-harmonic generation response, suitable birefringence, and a short UV cutoff edge down to 190 nm. A structure-property relationship study confirms that the [BO3] units are the primary source of the optical response. This work not only provides a promising deep-ultraviolet NLO crystal but also reveals a cation-mediated symmetry engineering strategy to design NCS borates.
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