CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
L. Yue,X.Z. Zheng,P.J. Xia,C. Wang,Y.F. Lei,M. Xu,W.B. Dai
Rare-earth (RE) and/or transition metal (TM) ions (co)doped phosphors have garnered much attention for promoting development in the fields of solid state lighting (SSL) and displays. It is a meaningful work to design high-quality phosphor via intelligent assembling from wide variety of compounds with RE/TM ions. Herein, the lanthanum borophosphate La 7 O 6 (BO 3 )(PO 4 ) 2 (LOBP) and Bi/Eu were selected as host and dopants for constructing the phosphor LOBP: Bi/Eu via solid phase synthetic method due to simple synthesis, chemical/thermal stability, rich cationic sites, appropriate bandgap, and controllable optical tuning from synergistic effect of cyan (Bi) and red (Eu) emissions, respectively. The structure and site occupations were analysed via XRD and Rietveld refinements , showing Bi 3+ ions were only resided in La 3+ sites within the monoclinic matrix (P2 1 /n) and appeared greater inclination towards the La sites with coordinate number ( CN ) = 8 as compared with CN = 7 due to the closer ion radius ratio. While Eu 3+ ions entered into the two distinct La sites with almost the same probability. The morphology and elemental mapping were obtained via SEM/EDS, exhibiting irregular particle shape with micron-level size, and the chemical composition met expectation. Through energy transfer (ET) from Bi to Eu under n -UV excitation, the adjustable photoluminescence (PL) from cyan traversing white and finally to red could be achieved. The concentration quenching for both singly- (Bi) and co-doped (Bi/Eu) phosphors were charged by the d-d interactions. Finally, the stable as-fabricated n -UV pumped w LED via coupling the composition-optimized white-emitting LOBP: 2%Bi, 7%Eu to a commercial 305 nm n -UV LED chip shows splendid performances.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2024
·Vol. 38
·期 12
·e7696
·
IF 3.7
Xueze Wang,Huawei Zhou,Xianxi Zhang
Bi-based organic halides have attracted widespread attention as potential substitutes for lead-based organic halide perovskites and have been explored and applied in many optoelectronic devices. The rational design of organic Bi-based halides is a popular research topic. In this work, we used benzylammonium (BA) cations to synthesize BA 3 Bi 2 I 9 (BBI) perovskite material and FA 3 Bi 2 I 9 (FBI, FA [formamidinium]) as control. We observe that the benzene rings in BA cations overlap with each other due to the benzene rings Π-Π conjugation in the crystal structure of BBI, which exhibits large interplanar spacing due to large BA ions. BBI has preferential orientation along the (020) crystal plane. Due to conjugation, scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) mapping images indicate that the surface of the BBI thin film is smoother and more uniform than that of the FBI thin film. We fabricated the device by growing thin films of BBI and FBI on ITO interdigital electrodes. The photodetector based on BBI SC exhibits stability and regularity with turning on/off of the light at different intensities (10, 20, 30, and 40 W m −2 ) and wavelengths (386, 397, 405, and 433 nm). The ultraviolet–visible (UV–vis) absorption and reflection spectrum analysis shows that BBI has a slightly wider bandgap than FBI. This study can provide some ideas for the design Π-Π conjugation in organic metal halides.
研究领域:
材料科学
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光电学
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化学
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物理学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
·
IF 8.1
Tingzhe Shen,Danni Zeng,Ze Liu,Yadong Hu,Yaxi Tian,Jun Song,Tao Yang,Rongfeng Guan,Changjian Zhou
Improving the efficiency of photogenerated carrier separation by designing heterojunction photocatalysts remains an important challenge. In this study, TiO 2 nanofibers were prepared by electrospinning, Bi/Bi 2 WO 6 /TiO 2 heterojunctions were constructed by hydrothermal method, and verified by characterization techniques. The heterojunction had good photodegradation activity to sulfamethoxazole (SMX) under ultraviolet and visible light irradiation (96.4 % within 60 min). The enhanced photodegradation activity of Bi/Bi 2 WO 6 /TiO 2 nanocomposites can be attributed to the synergistic effect of S-Scheme mechanism and Bi metal plasma action. In addition, Bi metals can generate a large number of electron-hole pairs under the action of surface plasmon resonance (SPR). In addition, the influence factors such as pH, SMX concentration and catalyst loading were studied. According to the detected intermediates, the photocatalytic degradation pathway of SMX was studied. The results of free radical capture experiment and ESR show that ·O 2 – and h + free radicals play an important role in the decomposition of SMX. The cyclic experiments show that Bi/Bi 2 WO 6 /TiO 2 nanocomposites have excellent stability and reuse characteristics. Finally, the mechanism of photocatalytic degradation of SMX was described. This study provides a promising perspective for the preparation and development of S-Scheme heterojunction photocatalysts based on Bi 2 WO 6 .
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Advanced Therapeutics
·
2023
·
IF 4.6
Lihua Wu,Yue Luo,Hu Wei,Shuilin Wu,Yufeng Zheng,Zhaoyang Li,Zhenduo Cui,Yanqin Liang,Shengli Zhu,Jie Shen,Xiangmei Liu
Bismuth metal–organic frameworks (MOFs) as catalysts are scarce. Herein, the first MOF comprising meso- tetra(4-carboxyphenyl) porphine (TCPP) as an organic ligand and Bi ion as a metal node, denoted as Bi-TCPP, is synthesized by a convenient one-step hydrothermal method. Compared to other 2D (Cu-TCPP) or 3D (PCN-222) MOFs with TCPP as a ligand, Bi-TCPP has ultrafast singlet oxygen generation ability and a high photothermal conversion efficiency of 49.5% under the irradiation of 660 nm light. This is due to Bi-TCPP's strong ligand-to-metal charge transfer (LMCT) events that form singlet oxygen ( 1 O 2 ). Further, when the electrons and holes above the bandgap relax to the band edge, the excess energy is converted into heat. In vitro and in vivo experiments show excellent antibacterial and repair effects. Hence, the synthesis of Bi-TCPP provides new ideas for the study of rare bismuth-based MOFs, and its excellent biocompatibility provides a possibility for further application.
研究领域:
材料科学
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化学
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生物医学工程
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DOI
高影响因子
Regenerative Biomaterials
·
2024
·
IF 5.6
Ma Li,Pan Jinbin,Shu Gang,Pan Haiyan,Li Jingang,Li Dong,Sun Shaokai
Enhanced computed tomography (CT) imaging with iodinated imaging probes is widely utilized for the diagnosis and evaluation of various liver diseases. However, these iodine-based imaging probes face intractable limitations including allergic reactions and contraindications. Herein, we propose the utilization of renal-clearable iodine-free bismuth chelate (Bi-DTPA dimeglumine) for the non-invasive fast assessment of hepatic ischemia–reperfusion injury (HIRI) via CT imaging for the first time. Bi-DTPA dimeglumine offers several advantages such as simple synthesis, no purification requirement, a yield approaching 100%, large-scale production capability (laboratory synthesis > 100 g), excellent biocompatibility and superior CT imaging performance. In a normal rat model, the administration of Bi-DTPA dimeglumine resulted in a significant 63.79% increase in liver CT value within a very short time period (30 s). Furthermore, in a HIRI rat model, Bi-DTPA dimeglumine enabled the rapid differentiation between healthy and injured areas based on the notable disparity in liver CT values as early as 15 min post-reperfusion, which showed a strong correlation with the histopathological analysis results. Additionally, Bi-DTPA dimeglumine can be almost eliminated from the body via the kidneys within 24 h. As an inherently advantageous alternative to iodinated imaging probes, Bi-DTPA dimeglumine exhibits promising prospects for application in liver disease diagnosis.
研究领域:
医学成像
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肝病学
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放射学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Energy Materials
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2025
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IF 5.5
Huanjun Su,Weili Shi,Yumeng Zhang,Ying Lin,Yani Liu
Mg3Sb2 Zintl compounds have emerged as promising thermoelectric materials due to their favorable electronic structures and low lattice thermal conductivity. However, strong carrier scattering, including ionized impurity and grain boundary scattering, suppresses mobility and limits the power factor. This study reveals that Zn doping plays a crucial role in tuning carrier scattering mechanisms in n-type Mg3(Sb,Bi)2. The substitution of Mg with Zn weakens ionized impurity scattering, facilitating charge transport and increasing carrier mobility from ∼72 to ∼135 cm2 V–1 s–1. As a result, a high power factor of ∼2089 μW m–1 K–2 is achieved at 573 K in Mg3.155Zn0.045Sb1.5Bi0.49Te0.01. Furthermore, Zn incorporation introduces localized lattice distortions and promotes the formation of high-density dislocations, which intensify phonon scattering and significantly suppress lattice thermal conductivity to ∼0.54 W m–1 K–1 at 773 K. These synergistic enhancements contribute to an optimized thermoelectric performance, yielding a peak ZT of 1.71 at 773 K and an average ZT of 1.21. The estimated conversion efficiency reaches 13% under a 470 K temperature gradient, highlighting Zn doping as an effective strategy for advancing Mg3(Sb,Bi)2-based thermoelectric materials toward high-temperature energy harvesting applications.
研究领域:
材料科学
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能源材料
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物理化学
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2023
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IF 6.2
Z.C. Yao,W.B. Dai,J. Luo,K. Nie,M. Xu
Several series of novel broad band white light emitting Bi/Tb/Eu tridoped in multiple lattice sites of single-phase Sr 3 YB 3 O 9 (SYBO) borate phosphors, which covered almost all visible range through mixing the separate blue, green and red emissions from dopants of Bi, Tb and Eu, respectively, were successfully obtained by using the facile and conventional solid-state reaction method under air condition. Rietveld refinements based on XRD data together with the combination match of charge and ion radius for dopants of Bi, Tb, Eu and lattice cations of Sr, Y and B show that Bi is more inclined to replace the Sr site while Tb/Eu are more likely to enter the Y site, respectively. Through spectrum analysis of photoluminescence excitation (PLE), PL and decay lifetime, the efficient energy transfer (ET) from the Bi to both Tb and Eu, and from Tb to Eu are all testified via the dipole-dipole interactions, indicating that the non-rare-earth activator Bi is acting both as the blue luminescence center and ET sensitizer, while the Tb contributes both as ET bridge and green luminescence center to better connect the Bi and Eu. The optimal tridoped white emission SYBO phosphor appears good thermal stability, which could continue to have its PL intensity above 75% at 150 °C as compared with the original room temperature PL intensity. Altogether, the single-component SYBO:Bi/Tb/Eu phosphor could be well served as potential white light phosphor for n -UV pumped w LED devices.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 23
·9395-9408
·
IF 4.5
Lin Yixuan,Qi Xiaoquan,Niu Guoqiang,Sun Qin,Ji Hongjun,Li Mingyu,Li Yufeng
Si 3 N 4 is a promising material for heat dissipation substrate due to its excellent thermal conductivity and mechanical properties. However, its application is limited by the difficulties in surface metallization. In this work, surface metallization of Si 3 N 4 ceramic substrate is realized by thick film method for the first time. Conductive silver paste containing Bi 2 O 3 -B 2 O 3 -ZnO glass frit as glass binder was prepared, and high-performance silver thick films were formed on Si 3 N 4 ceramic surface. The mechanical and electrical properties of silver films were significantly promoted with increasing sintering temperature, and silver films with high shear strength of 23.35 MPa and low resistivity of 3.41 μΩ·cm were obtained when sintered at 600 °C. In the meanwhile, the silver films exist high reliability under thermal cycles. The bonding between the silver thick film and Si 3 N 4 ceramic substrate was considerably enhanced as a result of interfacial reaction, forming Bi 2 Si 2 O 5 phase at the interface during sintering process. The formation mechanism was discussed and it is of great significance for the interfacial design in future studies. The results suggest that thick film method is a promising technology for obtaining high-quality surface metallization for Si 3 N 4 ceramic substrate. Graphical abstract
研究领域:
材料科学
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电子工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2022
·
IF 7.139
Tao Zhang,Hongzheng Pu,Hanlu Zeng,Ying Zhou,Xiangnan Gong,Qian Ye,Chuanyao Yang,Dingfeng Yang,Yuanyuan Li
Orbital engineering is an important strategy for modulating light absorption in photocatalysis . Here, Bi doping of the oxide photocatalyst Li 2 SnO 3 to enhance light absorption was rationally designed by orbital engineering. Based on density functional theory, owing to the lower Bi 6s energy level compared with that of Sn 5s, a deep impurity energy level induced by ionic Bi–O bonds is generated in the middle band gap of Li 2 SnO 3 . The impurity energy level can facilitate the utilization efficiency of light absorption, leading to remarkably enhanced photocatalytic performance. For Li 2 Sn 0.9 Bi 0.1 O 3 , the photodegradation rate of tetracycline solution reached 76% within 30 min, which was approximately 2.6 times higher than that for Li 2 SnO 3 . A radical trapping experiment revealed that the holes (h + ) play a dominant role in the elimination reaction . Finally, liquid chromatography–mass spectrometry was performed to monitor the photocatalytic process. This study lays a foundation for rational design of photocatalysts with excellent light absorption for photocatalysis .
研究领域:
材料科学
·
光催化
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DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2023
·
IF 3.7
Chen Li,Li Sun,Jinan Niu,Arianit A. Reka,Peizhong Feng,Hermenegildo Garcia
Improving the efficiency/cost ratio is the key to the practical application of photocatalysts. Using cheap minerals as carriers is an effective means to improve the efficiency/cost ratio of photocatalysts. Here, kaolinite was used to co-load TiO 2 nanoparticles and Bi containing core-shell spheres forming the composites with excellent photocatalytic performance. The rate constant per unit mass of TiO 2 in the optimal sample reached 18 times that of TiO 2 . Kaolinite plays important roles in promoting photocatalytic activity by improving the dispersion of TiO 2 and the adsorption of O 2 molecules and MO anions, besides the type-II energy band alignment of TiO 2 and Bi x O y .
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Bo Wang,Wenhui Feng,Lulu Zhang,Yan Zhang,Xueyan Huang,Zhibin Fang,Ping Liu
A novel Bi/CdS nanocomposite is obtained via an in-situ chemical reduction method under mild conditions. The incorporation of Bi nanostructure can significantly enhance the photocatalytic performance for methyl orange (MO) and salicylic acid (SA) degradation compared with pristine CdS under visible light irradiation. The dramatically improved photoactivity can be attributed to the enhanced light absorption and optimized charge separation. In addition, the photocatalysis mechanism upon Bi/CdS for MO degradation is also investigated. This study is hoped to provide a new inspiration for the construction of high-efficiency semimetal/semiconductor photocatalysts, especially for non-noble metal/M x S y nanocomposites.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 3
·1817-1822
·
IF 2.019
Wang Zixing,Yuan Changlai,Zhu Baohua,Feng Qin,Liu Fei,Miao Lei,Zhou Changrong,Chen Guohua
A novel microwave dielectric ceramics Bi(Sc 1/3 Mo 2/3 )O 4 with low firing temperature were prepared via the solid reaction method. The specimens have been characterized using scanning electron microscopy, X-ray diffraction, Raman spectroscopy and DC conductivity. The Bi(Sc 1/3 Mo 2/3 )O 4 ceramics showed B-site ordered Scheelite-type structure with space group C2/c. Raman analysis indicated that prominent bands were attributed to the normal modes of vibration of MoO 4
2− tetrahedra. The dielectric loss of Bi(Sc 1/3 Mo 2/3 )O 4 ceramics can be depended strongly the bulk conductivity by DC measurement. The superior microwave dielectric properties are achieved in the Bi(Sc 1/3 Mo 2/3 )O 4 ceramic sintered at 875 °C/4 h, with dielectric constant ~ 25, Q × f ~ 51,716 GHz at 6.4522 GHz and temperature coefficient of resonance frequency ~ − 70.4 ppm/°C. It is a promising microwave dielectric material for low-temperature co-fired ceramics technology.
研究领域:
材料科学
·
电子工程
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DOI
高影响因子
危险品化学品经营许可证（带存储）