CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Haiyang Dai,Qinlong Shen,Jing Chen,Dewei Liu,Tao Li,Cui Shang,Zhenping Chen
Ceramic samples of Mn 1- x Zr x WO 4 (0.00 ≤ x ≤ 0.20) were prepared by a solid-state reaction to study changes in the structural, magnetic, and dielectric properties of multiferroic MnWO 4 caused by replacing Mn 2+ ions with Zr 4+ ions. The results indicate that Zr 4+ replacement caused lattice deformation but did not affect the monoclinic lattice structure of any of the MnWO 4 samples. The concentration of vacancies, investigated by positron annihilation lifetime spectroscopy, increased with as the Zr 4+ content x from 0.00 to 0.20. It was observed that Zr 4+ replacement enhanced the dielectric constant of Mn 1- x Zr x WO 4 but slightly increased the dielectric loss. The magnetization and transition temperatures (T AF3 and T AF2 ) of the Mn 1- x Zr x WO 4 system were increased by the Zr 4+ replacement, and the existing temperature range of the AF2 phase was extended upon the substitution of Zr 4+ for Mn 2+ . This study demonstrated that the magnetic properties of Mn 1- x Zr x WO 4 were closely related to the vacancy concentration and lattice distortion.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Wei Wang,Heng Guan,Yizhuo Fan,Jian Fang,Duo Sun,Yu Chen,Shengping Ruan
Manganese tungstate (MnWO 4 ) is a novel catalytic semiconductor metal oxide with untapped potential for acetone-sensing applications. The construction of amorphous-crystalline heterojunctions shows promising prospects for developing new high-performance gas-sensitive materials. Here, an amorphous-MoS x /crystalline-MnWO 4 composite material was constructed, and the acetone-sensing properties were explored. Due to the abundant surface hanging bonds and defects of amorphous molybdenum sulfide as gas adsorption and reaction sites, the MoS x /MnWO 4 material has a richer surface adsorption oxygen and acetone sensing properties. Combined with carrier regulation effect of the p-n heterojunction, the optimum operating temperature of the MoS x /MnWO 4 composite is reduced (120 °C) and the response towards acetone is improved, reaching a value of 10.54 (100 ppm), which is approximately 4.5 times higher than that of the pure MnWO 4 material. This work is of reference significance for the application of amorphous MoS x in the field of gas sensing and the construction of high-performance acetone sensors.
研究领域:
材料科学
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传感技术
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纳米技术
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半导体物理
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Heng Guan,Yizhuo Fan,Wei Wang,Qilin Wang,Yu Chen,Shengping Ruan
As a ternary metal oxide with a suitable band gap and double catalytic center, MnWO 4 has a broad application prospect in the fields of electrochemistry, catalysis, and gas detection. In this study, MnWO 4 @C composite was synthesized by a one-step hydrothermal method and its sensitivity property to xylene was investigated. The carbon microspheres with favorable ion adsorption ability effectively inhibit the agglomeration of the reaction ions, thus producing uniformly dispersed nanoscale MnWO 4 particles with large specific surface area, which could expose more reaction sites for the high valence W 6+ with good redox ability as well as Mn 2+ catalytic activation center with d-orbit. The MnWO 4 @C composite material possesses enhanced gas adsorption and high catalytic activity. The response of the MnWO 4 @C composite (53.4, 100 ppm) is 25 times larger than that of MnWO 4 to xylene, and the modified material shows properties of lower detection limit (2 ppm), good operating temperature (157 ℃) and significant selectivity to xylene. This work provides an effective strategy to improve the sensitive activity of MnWO 4 .
研究领域:
材料科学
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气体传感器技术
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 19
·4682
·
IF 3.1
Duo Wang,Zhaomin Wang,Chunli Wang,Dongming Yin,Yao Liang,Limin Wang,Yong Cheng,Ming Feng
Polyanionic structures, (MO4)n−,can be beneficial to the transport of lithium ions by virtue of the open three-dimensional frame structure. However, an unstable interface suppresses the life of the (MO4)n−-based anode. In this study, MnWO4@C nanorods with dense nanocavities have been synthesized through a hydrothermal route, followed by a chemical deposition method. As a result, the MnWO4@C anode exhibits better cycle and rate performance than MnWO4as a Li-ion battery; the capacity is maintained at 718 mAh g−1at 1000 mA g−1after 400 cycles because the transport of lithium ions and the contribution of pseudo-capacitance are increased. Generally, benefiting from the carbon shell and electrolyte additive (e.g., FEC), the cycle performance of the MnWO4@C electrode is also effectively improved for lithium storage.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 3
·1686-1694
·
IF 3.591
Kezhong Wu,Pengyuan Fu,Bei Ruan,Mengmeng Wu,Mingxing Wu,Ruitao Wu
Replacing the expensive Pt catalyst of counter electrodes (CEs) with a low-cost Pt-free catalyst has been regarded as one of the crucial steps for cost effectiveness of dye-sensitized solar cells (DSSCs). Herein, MnWO4 as a binary mixed oxide (MnO–WO3) has been prepared with (NH4)10H2(W2O7)6·xH2O and Mn(NO3)2·4H2O via a facile hydrothermal method. DSSCs using MnWO4 CEs show power conversion efficiency (PCE) of 4.93%. To improve the catalytic activity of MnWO4 CEs further, three proportions of MnWO4@AC mixed oxide composite catalysts have been fabricated via simple physical mixing MnWO4 with activated carbon (AC) by ball-milling. Moreover, the DSSCs with the MnWO4@AC composites CEs generate high PCE of 6.50, 6.45 and 6.12%, respectively, from MnWO4 : AC mass ratios of 1 : 2, 1 : 1 and 2 : 1 for the regeneration of traditional iodide/triiodide (I3−/I−) redox couples, which were superior to the pristine MnWO4, Pt- and AC-based counterpart 4.93%, 4.54% and 2.10% CEs under the same test conditions and method. The favorable performances make MnWO4@AC composites act as a new resource of electro-catalytic Pt-free materials for high-performance CEs in the encapsulation of DSSCs.
研究领域:
材料科学
·
可再生能源
·
光电化学
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2017
·
IF 0
Quan Zou,Ruowei Tang,Huai-xin Zhao,Jiabing Jiang,Jingli Li,Yan-yan Fu
Multimodal imaging nanoparticles that integrate different imaging modalities into one system could provide complementary and detailed imaging information to satisfy the request of precision medicine. However, most multimodal nanoparticles suffer from multistep synthesis and complicated compositions, which hinder their practical application in biomedical research. Therefore, development of a facile method to prepare a single-nanoparticle contrast agent to achieve multimodal imaging is of significance. In this paper, hyaluronic-acid-modified manganese tungstate nanoparticles (HA-MnWO4 NPs) were successfully synthesized via a facile one-step hydrothermal procedure for efficient T1/T2-weighted MR and CT trimodal imaging in vivo. In the single-nanoparticle, manganese (Mn) with five unpaired electrons offers strong relaxation for MR imaging, while tungsten (W) with high atomic number provides high X-ray attenuation coefficient for CT imaging. Furthermore, HA-template synthesis endows the HA-MnWO4 nanoparticle with good biocompatibility and active targeting ability. In vitro and in vivo experiments reveal that the HA-MnWO4 NPs possess good T1/T2 dual MRI and CT imaging ability, low cytotoxicity, and favorable active tumor homing, demonstrating that the HA-MnWO4 NPs have great potential in clinical MR/CT multimodal imaging. In addition, the liver and renal structures can be clearly displayed by HA-MnWO4-supported imaging. This work will provide technical guidance for the simple development of multifunctional nanoparticles.
研究领域:
生物医学工程
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纳米医学
·
影像学
✓ 已验证
产品关联
DOI
危险品化学品经营许可证（带存储）