JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Weijia Guo,Peiyao Zhao,Zhenxing Yue
Passive electronic components made from dielectric ceramics can hardly operate at extremely high temperatures, which is attributed to the sharply increasing dielectric loss and leakage conductance. In this work, the widely applicated CaTiO 3 ceramics are used as the matrix, and the high-temperature electrical properties are modified by doping Sm 3+ and Al 3+ . The Sm-doping in CaTiO 3 ceramics can significantly suppress the dielectric relaxation at low frequencies and reduce the high-temperature leakage conductance. Continued doping of Al in Ca 0.6 Sm 0.27 TiO 3 ceramics can further reduce the high-temperature dielectric loss and conductivity. These changes are associated with tighter crystal structures and fewer defects in the ceramics. With Sm and Al doping, the high-temperature dc conductivity of the ceramics is reduced by about 4 orders of magnitude, and a dielectric loss of less than 0.02 and a low temperature cofficient of capacitance (TCC) of − 25 ppm/℃ are obtained over a wide temperature range of room temperature to 530 ℃. Outstanding temperature stabilities are exhibited over a temperature range of 25 ∼ 200 ℃ in energy storage performance and charge-discharge property. Extremely fast discharge speed ( t 0.9 = 16 ns) makes it suitable for pulsed power electronic systems. Such linear dielectric materials are expected to be used in harsh environment of high temperatures.
研究领域:
材料科学
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电气工程
·
陶瓷
✓ 已验证
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Feng Li,Zhen Wu,Xiaolong Tang,Xiangwei Li,Xingqiang Liu,Shuyuan Yu,Longfu Wei,Changlin Yu
Ti-based semiconductors the eco-friendly materials. Here, using n-tetrabutyl titanate and calcium acetate as raw materials, a dual- Z -scheme TiO 2 /CaTi 4 O 9 /CaTiO 3 heterojunction was facilely constructed via the solvothermal combination with calcination route. The obtained samples were intensively characterized by some physicochemical methods such as TG, XRD, FT-IR, SEM , TEM, XPS, UV–Vis DRS, PL , N 2 physisorption-desorption, and electrochemical tests. The optimum TiO 2 /CaTi 4 O 9 /CaTiO 3 photocatalyst fabricated at a solvothermal temperature of 160 °C and calcination temperature of 700 °C shows high efficiency for H 2 production, which was 11, 5, and 1.6 times higher than that of rutile-phase TiO 2 , CaTiO 3 and commercial P25(TiO 2 ), respectively. The Cr(VI) reduction rate over TiO 2 /CaTi 4 O 9 /CaTiO 3 was 3.3, 5.2, and 3.1 times higher than those of rutile-phase TiO 2 , CaTiO 3, and commercial P25, respectively. The superior photocatalytic performance is attributed to the strong redox ability of carriers excited by wide band gap semiconductors and the unique dual- Z -scheme which largely promotes carrier separation.
研究领域:
材料科学
·
化学
·
环境科学
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·Vol. 35
·期 50
·e07124
·
IF 19
Xibei Jia,Xiaobo Wu,Long Qi,Xianggang Dai,Jian Wang,Tao Jiang,Zhanyong Hong
In the context of the ongoing development of artificial intelligence and 5G technologies, a growing number of sensors are being integrated into the daily lives. Self-powered wearable sensors based on triboelectric nanogenerator (TENG) represent an innovative solution to this trend, but the output performance of the flexible TENGs remains suboptimal. In this study, the band-matched calcium titanate (CaTiO 3 ) and zinc oxide (ZnO) nanostructures are prepared to form CaTiO 3 /ZnO (CTO/ZnO) Schottky heterojunctions. The heterojunctions are subsequently doped into organic ferroelectric polyvinylidene fluoride (PVDF) to create flexible composite film, which significantly increases the dielectric constant through space charge polarization. Then the CTO/ZnO-PVDF composite films served as triboelectric materials of the CaTiO 3 /ZnO-PVDF-based TENG (CZP-TENG). After optimizing the molar ratio of ZnO to CTO in heterojunction and weight ratio of CTO/ZnO in PVDF, both the output voltage and current density of the TENG are significantly improved, exhibiting a power density of 106.6 mW m −2 . Finally, the CZP-TENG powers light–emitting diodes and a temperature sensor, serves as a wearable sensor, and enables self-powered human body sensing, particularly in gait recognition for preventing of movement-related diseases and injury rehabilitation.
研究领域:
纳米技术
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能量采集
·
可穿戴传感器
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材料科学
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柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Baolin Guo,Xiaokang Li,Yiwen Wu,Qing Yao
Microwave dielectric ceramics, as a novel electronic material, had been extensively utilized in the fabrication of radio frequency components for communication systems, including filters, dielectric antennas, and radar applications. While dry pressing remained the most prevalent method for filter fabrication, this study proposed an innovative gel casting system for manufacturing ceramic waveguide filters. The developed system employed Hydantion epoxy resin (HER) as the gelling agent, polyethyleneimine (PEI) as the curing agent, and MgTiO 3 -CaTiO 3 (MCT) ceramic powder (exhibiting dielectric properties of ε r = 20.5, Q×f = 55,000 GHz, and τ f = ±10 ppm/°C) as the dielectric material. Experimental results demonstrated that incorporating 13 wt.% Hydantoin epoxy resin with 0.7 wt.% polyacrylic acid (PAA) dispersant yields a well-dispersed ceramic slurry containing 80 wt.% solid loading. After drying, the green body was sintered at 1400 °C for 3 h at air atmosphere. This process resulted in densified samples with homogeneous microstructure and optimized microwave dielectric properties. Building upon this foundation, a fourth-order waveguide filter was designed and fabricated with a center frequency of 3.5 GHz, bandwidth of 300 MHz, and return loss exceeding 15 dB. Compared to conventional dry pressing techniques, the gel casting approach demonstrated distinct advantages in simplified processing and cost-effectiveness. Its superior near-net-shape forming capability for complex geometries proved potential applications in next-generation 5G/6G microwave devices.
研究领域:
材料科学
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电气工程
·
微波技术
·
通信系统
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陶瓷工艺
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2019
·
IF 3.834
Xin Chen,Xiufang He,Xia Yang,Zhansheng Wu,Yunfeng Li
Novel binary coupled 2D/1D g-C 3 N 4 /CaTiO 3 composite photocatalysts with face-to-face contact were synthesized by a solvothermal and calcination method. The properties of g-C 3 N 4 /CaTiO 3 composites were characterized by XRD, SEM, TEM, BET, UV–vis/DRS, etc. The beneficial band position tuning via coupling g-C 3 N 4 with CaTiO 3 , and its 2D/1D face-to-face contacted pattern transfer electrons rapidly and retard photogenerated electrons-holes recombination. The photocatalytic ability was evaluated by using crystal violet (CV) and malachite green (MG). The as-prepared g-C 3 N 4 /2CTO sample shows the highest photocatalytic activity, and the degradation rate of CV and MG can reach up to 99.76% and 95.02% under simulate sunlight owing to the impressive synergic effect between 2D/1D g-C 3 N 4 /CaTiO 3 face-to-face contact pattern. The free radical scavenging experiments demonstrate that the · O 2 − and h + are the main active species. Further, the degradation intermediates of CV and MG detected by GC–MS found both containing phenol , 2,2-Methylenebis(6-Tert-Butyl-4-Methylphenol) (MTBM). Hence, they may have a similar degradation pathway, which provided a significant guideline for the degradation of triphenylmethane dyes. Our prepared novel 2D/1D face-to-face contact pattern nanocomposite is expected to be a fresh scheme for high-efficiency refractory pollutants degradation under sunlight.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Junfeng Yang,Jinsong Lu,Liangsheng Xie,Jingfeng Wu,Yu Wen,Qin Zhang
Herein, the SrTiO 3 -TiO 2 -CaTiO 3 /Cu 2 O quaternary composite has been designed and prepared via one-step hydrothermal process followed by a NaBH 4 reduction treatment. By comparing the H 2 production rate (HPR) of Sr-Ti-Ca/Cu samples prepared by different Cu sources, it is found that Sr-Ti-Ca/Cu has the best H 2 production performance when CuCl 2 is as Cu source. As expected, the highest HPR of Sr-Ti-Ca/Cu sample is up to 5.088 mmol g −1 h −1 , which is 195.7 times as higher as that of the Sr-Ti-Ca sample (0.026 mmol g −1 h −1 ) under the same conditions. Moreover, the HPR reached 0.692, 0.530 and 0.647 mmol g −1 h −1 in tap water, lake water and river water, indicating that the photocatalyst has high practicability in natural water sources. In addition, the experiment of the tap water composition effect on H 2 production performance shows that NO 3 − and SO 4 2− ions have great negative influence on the HPR. Compared with Sr-Ti-Ca, the light absorption of Sr-Ti-Ca/Cu extends over the entire visible region, the interface resistance decreases, and the photocurrent density increases. These results suggest that the well-designed dual p-n heterojunctions and dual type-II heterojunctions in Sr-Ti-Ca/Cu sample can enhance the light absorption in the ultraviolet region and realize the rapid separation and migration of photogenerated charge, thereby accelerating the production of H 2 . This work shows the strong advantage and potential of non-precious metal efficient photocatalyst system for producing H 2 from deionized water and natural fresh water.
研究领域:
材料科学
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化学
·
环境科学
·
能源
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 20
·9148-9161
·
IF 6.7
Zheng Liu,Hong Ding,Miaomiao He,Yulin Jiang,Lin Qi,Meixuan Du,Jing Wang,Yubao Li,Limin Liu,Ganjun Feng,Li Zhang
Desirable antibacterial and osseointegration abilities are essentially important for long-term survival of a Ti-orthopedic implant. Herein, a near-infrared light (NIR) excited antibacterial platform with excellent osseointegration composed of perovskite calcium titanate/nickel hydroxide on a Ti implant (Ni(OH)2@CaTiO3/Ti) was designed and successfully fabricated. The construction of the heterostructure efficiently separated the photogenerated electron–hole pairs to produce sufficient reactive oxygen species (ROS), which enabled the photoactivated bacterial inactivation (PBI) of Ti implants. The results showed that the surface-modified Ti implant displayed remarkable antibacterial ability with bacterial inhibition rates of 95.5% for E. coli and 93.8% for S. aureus under NIR excitation. Also, the intervention of Ni(OH)2 could create a slightly alkaline surface on the Ti implant, which synchronized with Ca-rich CaTiO3 to regulate the osteogenic microenvironment in favor of the adhesion, proliferation and differentiation of MC3T3-E1 cells as well as the up-regulation of osteogenesis-related gene expressions. The in vivo implantation experiments further confirmed that the heterostructured coating prominently accelerated the formation of new bone and promoted the osseointegration of Ti implants. Our work may provide a novel concept for improving the antibacterial and osseointegration abilities of Ti implants in orthopedic and dental applications.
研究领域:
材料科学
·
生物材料
·
骨科
·
牙科科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Horizons
·
2022
·Vol. 10
·期 2
·454-465
·
IF 15.717
Jianbo Li,Yanxia Wang,Xue Jiang,Zhen Tian,Huijun Kang,Zongning Chen,Enyu Guo,Zhiqiang Cao,Tongmin Wang
The thermal conductivity of superlattices is strongly reduced as compared to that of the parent materials due to phonon-scattering and thermal boundary resistances at the superlattice period interfaces. Herein, homogenous superlattices consisting of homogenous structural CeδCa1−δTiO3 and CaTi1−δCeδO3 alternate layers were obtained through a variable-valence Ce doping, providing multi-quantum well interfaces between the alternate layers due to Ce-substitution at Ca and Ti sites, respectively. This material comprising these homogenous superlattices displayed a significantly reduced lattice thermal conductivity of 1.82 W m−1 K−1 and a record high zT value of 0.405 at 1031 K in CaTiO3-based thermoelectric materials. This strategy of synthesizing homogeneous superlattices provides a cost advantage over heterogeneous superlattices prepared by the molecular beam epitaxy method and paves a route for preparing bulk superlattices with unique thermoelectric properties rooting in the quantum domain limiting effect.
研究领域:
材料科学
·
热电学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2014
·
IF 4.258
Xiao-Shui Li,Xi Chen,Huan Sun,Bi-Feng Yuan,Yu-Qi Feng
Selective and effective enrichment of phosphopeptides from complex samples is essential in phosphoproteome study by mass spectrometry (MS). In this work, we compared perovskites (MgTiO 3 , CaTiO 3 , SrTiO 3 , BaTiO 3 and CaZrO 3 ) with metal oxides (ZrO 2 and TiO 2 ) in their capability for the selective enrichment of phosphopeptides. It was found here that perovskites exhibited higher selectivity towards phosphopeptides than commonly used ZrO 2 and TiO 2 , even though they all have high affinity to phosphopeptides. As for perovskites, CaTiO 3 exhibited better selectivity for enrichment of phosphopeptides than SrTiO 3 , MgTiO 3 , BaTiO 3 and CaZrO 3 , which might be ascribed to their crystal structures and electrophilic abilities. Moreover, to further confirm the performance of CaTiO 3 , CaTiO 3 and TiO 2 were applied to the enrichment of phosphopeptides from tryptic digest of proteins of human Jurkat-T cell lysate, respectively. The results showed CaTiO 3 has much higher selectivity than TiO 2 in the enrichment of phosphopeptides from the complex biological sample. Taken together, here we show that CaTiO 3 is an excellent material for the highly selective enrichment of phosphopeptides and it could be potentially used in the large-scale phosphoproteome study.
研究领域:
蛋白质组学
·
分析化学
·
生物医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 4
·1261-1273
·
IF 8.8
Li Yang,Tang Ming-Yang,Zhang Zhong-Gang,Li Qi,Li Jing-Lei,Xu Zhuo,Liu Gang,Li Fei
BaTiO 3 ceramics are difficult to withstand high electric fields, so the energy storage density is relatively low, inhabiting their applications for miniaturized and lightweight power electronic devices. To address this issue, we added Sr 0.7 Bi 0.2 TiO 3 (SBT) into BaTiO 3 (BT) to destroy the long-range ferroelectric domains. Ca 2+ was introduced into BT-SBT in the form of CaTiO 3 (CT), which has the effect of inhibiting the movement of A-site defects to reduce dielectric loss and refining the grains to increase the breakdown field strength. In addition, we have increased the density and grain uniformity of ceramics by repeated rolling of the green samples through the viscous polymer processing (VPP), to further increase the breakdown electric field. The BT-SBT-CT ceramics exhibit the high recoverable energy storage density of 4.0 J·cm −3 under electric field of 480 kV·cm −1 . Its recoverable energy storage density varies by less than 8% in the temperature range of 30–150 °C, indicating good temperature stability of the energy storage performance. In this work, the energy storage performance of barium titanate-based ceramics was greatly improved by transforming ferroelectrics into relaxor ferroelectrics and VPP method, which can bring new inspiration for the research of energy storage ceramics. Graphical abstract
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
ADVANCED MATERIALS
·
2026
·
IF 29.1
Jianbo Li,Jinghan Zhao,Manliu Du,Zhang Chen,Ying Fu,Guibing Zhang,Yaqian Du,Junjie Liu,Jun Wang
Photothermoelectric (PTE) detectors have attracted extensive attention due to the advantages of no external bias, negligible 1/f noise, and low fabrication cost for arrayed and miniaturized devices, and they circumvent the bandgap limitation of traditional photon detectors. However, the practical application of current mainstream PTE materials remains severely hindered by their poor high-temperature stability, especially in harsh scenarios including high-temperature monitoring and industrial waste-heat detection. In this work, CaTiO 3 is selected as the PTE material owing to its outstanding high-temperature stability, excellent chemical stability, non-toxicity, and low cost. Nevertheless, intrinsic insulating CaTiO 3 possesses neither efficient optical absorption nor favorable thermoelectric properties. Herein, abundant oxygen vacancies are introduced to endow CaTiO 3 with broad-spectrum optical absorption via the formation of defect energy levels within the bandgap. Meanwhile, La doping was employed to improve its thermoelectric performance. As a result, the La 0.2 Ca 0.8 TiO 3 sample achieves a responsivity of ≈300 mA W −1 and a noise level below 5 × 10 −9 W Hz −1/2 across a broad spectral range when only intrinsic resistance is considered. It well meets the application needs of harsh civilian environments with no strict requirement for response speed. This work offers a feasible strategy for developing high-performance PTE detectors applicable to high-temperature and harsh working conditions.
✓ 已验证
DOI
PubMed
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 27
·4532-4538
·
IF 2.942
Qiuhong Zhang,Xiang Li,Zhaohui Ren,Gaorong Han,Chuanbin Mao
Graphical Calcium titanate (CaTiO 3 ) nanofibers with controlled microstructure were fabricated by electrospinning. The nanofibers synthesized without F127 surfactant, which are of markedly increased surface area and pore volume, present the highest drug-loading capacity and the most sustained release kinetics. Calcium titanate (CaTiO 3 ) nanofibers with controlled microstructure were fabricated by a combination of sol–gel and electrospinning approaches. The fiber morphology has been found to rely significantly on the precursor composition. Altering the volume ratio of ethanol to acetic acid from 3.5 to 1.25 enables the morphology of the CaTiO 3 nanofibers to be transformed from fibers with a circular cross section to curved ribbon-like structures. Ibuprofen (IBU) was used as a model drug to investigate the drug-loading capacity and drug-release profile of the nanofibers. It was found that the BET surface area and the pore volume decrease markedly with the utilization of F127 surfactant. The nanofibers synthesized without F127 surfactant present the highest drug-loading capacity and the most sustained release kinetics. This study suggests that calcium titanate nanofibers can offer a promising platform for localized drug delivery.
研究领域:
材料科学
·
药学
·
生物医学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）