CARBON
·
2018
·
IF 7.082
Jian Wu,Liwen Mu,Jiahua Zhu,Xin Feng,Xiaohua Lu,Roland Larsson,Yijun Shi
In this paper, bubble-on-plate structure is realized on hollow IF-MoS 2 /reduced graphene oxide (HIF-MoS 2 /RGO) nanocomposites . HIF-MoS 2 nanocages templated with the generated ammonia (NH 3 ) are connected to RGO through the interlayered MoS 2 . The as-prepared HIF-MoS 2 /RGO is added into an ionic grease to study the tribological behavior of HIF-MoS 2 /RGO. For comparison, commercial grade MoS 2 nanoparticles , single RGO or HIF-MoS 2 or their physical mixture are also studied. Tribological results show that, compared with other additives, HIF-MoS 2 /RGO nanocomposites have the best anti-wear properties especially under higher load of 3.0 GPa. The wear reduction of HIF-MoS 2 /RGO reinforced grease under 2.5 GPa and 3.0 GPa reached 67% and 96%, respectively. In addition, HIF-MoS 2 /RGO reinforced grease achieves much lower and stable friction coefficient (0.079, the value of neat grease is 0.098) under 3.0 GPa. HIF-MoS 2 /RGO reinforced grease maintains very low friction coefficient and wear up to 4.1 GPa, while the normal MoS 2 and RGO show high wear at the pressure up to 3.0 GPa. It is proposed that HIF-MoS 2 nanocages on RGO act as rolling balls during friction resulting in better separation of steels.
研究领域:
材料科学
·
纳米科技
·
表面工程
·
摩擦学
·
复合材料
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 40
·2203835
·
IF 15.153
Shasha Guo,Toshinari Koketsu,Zhiwei Hu,Jing Zhou,Chang-Yang Kuo,Hong-Ji Lin,Chien-Te Chen,Peter Strasser,Lijun Sui,Yu Xie,Jiwei Ma
Transition metal oxides (TMOs) as high-capacity electrodes have several drawbacks owing to their inherent poor electronic conductivity and structural instability during the multi-electron conversion reaction process. In this study, the authors use an intrinsic high-valent cation substitution approach to stabilize cation-deficient magnetite (Fe 3 O 4 ) and overcome the abovementioned issues. Herein, 5 at% of Mo 4+ -ions are incorporated into the spinel structure to substitute octahedral Fe 3+ -ions, featuring ≈1.7 at% cationic vacancies in the octahedral sites. This defective Fe 2.93 ▫ 0.017 Mo 0.053 O 4 electrode shows significant improvements in the mitigation of capacity fade and the promotion of rate performance as compared to the pristine Fe 3 O 4 . Furthermore, physical-electrochemical analyses and theoretical calculations are performed to investigate the underlying mechanisms. In Fe 2.93 ▫ 0.017 Mo 0.053 O 4 , the cationic vacancies provide active sites for storing Li + and vacancy-mediated Li + migration paths with lower energy barriers. The enlarged lattice and improved electronic conductivity induced by larger doped-Mo 4+ yield this defective oxide capable of fast lithium intercalation. This is confirmed by a combined characterization including electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), galvanostatic intermittent titration technique (GITT) and density functional theory (DFT) calculation. This study provides a valuable strategy of vacancy-mediated reaction to intrinsically modulate the defective structure in TMOs for high-performance lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固体物理
·
纳米材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
ACS Materials Letters
·
2022
·
IF 11.17
Shumin Zheng,Dan Feng,Lekai Xu,Jiang Du,Bao Li,Bao Wang
Electrodes with a high areal capacity are critical for developing high-energy-density sodium-ion batteries (SIBs). The free-standing thick electrode is a promising candidate among the state-of-art electrodes, since it has the advantages of high areal mass, binder-free, current-collector-free, and no carbon additive; thus, the whole mass of the electrode is an active material that can contribute to capacity. However, enhancing areal density by introducing thick electrodes impinges on the transport of charge carriers including ions and electrons. Here we designed and synthesized an ultrathick (1500 μm) free-standing foam, which is a carbon framework with 1T-MoS2 nanosheets embedded in the vertically aligned channel wall. To tune the areal mass and morphology of the as-obtained foam, a confined iterative self-assembly strategy was proposed. The Na+ storage behavior was studied by using the as-obtained foam as a free-standing electrode against Na metal. Consequently, it displays good cycle stability even with a high areal mass of 20.74 mg cm–2 and delivers an astonishing reversible areal capacity of 19.75 mAh cm–2 at 0.01 A g–1, which greatly exceeds that of most sodium storage materials. The proposed confined iterative self-assembly strategy for fabricating thick electrodes opens new avenues for high areal capacity batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
Advanced Electronic Materials
·
2019
·Vol. 5
·期 10
·1900552
·
IF 6.312
Li Yang,Hao Wu,Wenfeng Zhang,Xun Lou,Zijian Xie,Xu Yu,Yuan Liu,Haixin Chang
Room temperature ferromagnetic semiconductors remain one of the most puzzling issues to be solved in tens of years. Nowadays, 2D ferromagnetic transition metal dichalcogenides (TMDCs) nanosheets attract continuous interest due to their exceptional electronic structure and properties. Here, it is identified that semiconducting 2H-phase MoTe 2 few/mono-layer mixed nanosheets present a room temperature ferromagnetic property with Curie temperature above 400 K, although the MoTe 2 bulk counterpart shows diamagnetic properties. The origin of such observed room temperature ferromagnetism is attributed to the combination of their structural defects including Te vacancies, disorders, and amorphous imperfections and edge-states caused by reduced dimensionality. Moreover, a distinct enhancement of ferromagnetic properties at room temperature is revealed by a non-magnetic Ta doping strategy. Such structural defects and edge-states modulated ferromagnetism offers a feasible strategy to search for more robust room temperature ferromagnetic TMDCs nanosheets, which is essential to explore novel electronic and spintronic devices where both carrier charge and spin freedom can be controlled.
研究领域:
凝聚态物理
·
材料科学
·
纳米科技
·
自旋电子学
·
半导体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2020
·
IF 4.65
Zhixin Yao,Yuandong Peng,Chao Xia,Xuwu Yi,Shenghua Mao,Miantuan Zhang
The effect of calcination temperature on the coating layer and the phase of the alloy matrix is the main problem to improve the heat treatment process of SMCs and obtain excellent magnetic properties . In this study, FeNiMo@Al 2 O 3 powders which were coated by sol-gel and calcined at 900–1300 °C were prepared and these powders were pressed into SMCs. The results showed that the surface of the powder was uniformly coated with Al 2 O 3 . As the heat treatment temperature increases, the phase of the coating changed from AlOOH to γ-Al 2 O 3 , δ-Al 2 O 3 , θ-Al 2 O 3 , and α-Al 2 O 3 . Meanwhile, the new phase γ-Fe, Ni appeared in the alloy matrix. The magnetic permeability of the sample is very stable in the frequency range of 10–500 kHz. The magnetic loss decreases first and then increases, with a minimum at 1100 °C. The permeability and magnetic loss of the sample pressed from the powder obtained by calcination at 1100 °C are 321.78 mw/cm 3 and 87.61 (50 kHz, 100 mT) at the typical industrial application conditions of Iron–Nickel SMCs. The microstructure and the magnetic properties show that the obtained α-Al 2 O 3 have excellent insulation and heat resistance. This resulted in a significant reduction in core losses of FeNiMo SMCs.
研究领域:
材料科学
·
磁性材料
·
无机非金属材料
·
粉末冶金
·
功能材料
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Fei Huang,Sikun Zhou,Ziyang Yan,Sha Wang,Hong Zhang,Shutong Wang,Shouhuan Zhou
Electrode materials significantly impact supercapacitor performance and developing high-performance electrode materials is crucial in energy storage. Commonly used laser-induced electrode materials are currently limited by severe contamination and hard-to-change intrinsic properties. This paper proposes a method for fabricating high-performance supercapacitors by laser carbonizing the lignin composite fiber membranes with heating treatment. Lignin fiber can achieve superior tensile strength, stiffness, and carbonization degree under suitable heat treatment temperatures. Heat treatment at 450 °C has been proven to be the ideal temperature for supercapacitor performance. At a current density of 1 A/g, the supercapacitor can reach the highest specific capacitance of ∼391.2F/g. In addition, doping MoS 2 boosted the device's performance to a specific capacitance of ∼527.8F/g, a power density of ∼500 W/kg, and an energy density of ∼73 Wh/kg at the same current density. In addition, lignin fibers are ideal materials in electronic textiles due to their soft, thin, and breathable properties. This study provides supportive evidence and technical guidance for improving the performance of flexible wearable supercapacitors.
研究领域:
储能技术
·
材料科学
·
纳米技术
·
电化学
·
柔性电子学
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 4
·1-13
·
IF 5.3
Li Guiyin,Yan Ruijie,Chen Wei,Wu Runqiang,Liang Jintao,Chen Jiejing,Zhou Zhide
Golgi protein 73 (GP73) is a new serum marker associated with early diagnosis and postoperative assessment of hepatocellular carcinoma (HCC). Herein, an electrochemical/fluorescence dual-signal biosensor was designed for determination of GP73 based on molybdenum disulfide/ferrocene/palladium nanoparticles (MoS 2 -Fc-PdNPs) and nitrogen-doped graphene quantum dots (NGQDs). GP73 aptamer (Apt) was labeled with NGQDs to form the NGQDs-Apt fluorescence probe. MoS 2 -Fc-PdNPs served not only as the fluorescence quencher but also as electrochemical enhancer. The sensing platform (NGQDs-Apt/MoS 2 -Fc-PdNPs) was formed based on the fluorescence resonance energy transfer (FRET) mechanism. In the presence of GP73, the specific binding of NGQDs-Apt to GP73 interrupted FRET, restoring the fluorescence of NGQDs-Apt at λ ex/em = 348/438 nm and enhancing the oxidation current of Fc in MoS 2 -Fc-PdNPs at 0.04 V through differential pulse voltammetry (DPV). Under the optimal conditions, the DPV current change and fluorescence recovery have a good linear relationship with GP73 concentration from 1.00 to 10.0 ng/mL. The calibration equation for the fluorescence mode was Y 1 = (0.0213 ± 0.00127) X + (0.0641 ± 0.00448) and LOD was 0.812 ng/mL (S/N = 3). The calibration equation of the electrochemical mode was Y 2 = (3.41 ± 0.111) X + (1.62 ± 0.731), and LOD of 0.0425 ng/mL (S/N = 3). The RSDs of fluorescence mode and electrochemical mode after serum detection were 1.62 to 5.21% and 0.180 to 6.62%, respectively. By combining the electrochemical and fluorescence assay, more comprehensive and valuable information for GP73 was provided. Such dual-mode detection platform shows excellent reproducibility, stability, and selectivity and has great application potential. Graphical Abstract
研究领域:
生物医学工程
·
肿瘤学
✓ 已验证
DOI
PubMed
高影响因子
Materials Horizons
·
2017
·Vol. 4
·期 2
·274-280
·
IF 10.706
Ke Zhang,Mingzeng Peng,Wei Wu,Junmeng Guo,Guoyun Gao,Yudong Liu,Jinzong Kou,Rongmei Wen,Ying Lei,Aifang Yu,Yang Zhang,Junyi Zhai,Zhong Lin Wang
Flexible functional devices based on two dimensional (2D) materials are extremely suitable for malleable, portable and sustainable applications, such as health monitoring, electronic skin and optoelectronics. In this work, we developed a flexible photodetector based on a p-CuO/n-MoS2 heterojunction with an enhancement in photocurrent and detection sensitivity. Because of the non-centrosymmetric structure in monolayer MoS2, the piezo-potential induced by applied strain adjusts the band structure at the heterojunction interface and broadens the depletion region based on the piezo-phototronic effect. The border depletion can be discreetly used to improve the photo-generated carrier separation and transport to enhance photoresponse performance. When illuminated by a 532 nm laser, the photocurrent of the heterojunction can be enhanced 27 times under a tensile strain of 0.65% compared to strain free conditions and the detection sensitivity can reach up to 3.27 × 108 Jones. As a result, our research provides a new strategy for novel design and performance optimization of 2D material heterostructures in the application of optoelectronics.
研究领域:
材料科学
·
纳米科技
·
光电子学
·
凝聚态物理
·
功能器件
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yang-Yang Hu,Yu-Lin Bai,Xue-Yan Wu,Xiao Wei,Kai-Xue Wang,Jie-Sheng Chen
Molybdenum disulfide (MoS 2 ), employed for rechargeable sodium-ion batteries (SIBs) as an anode material , has attracted considerable attention attributing to its high Na + intercalation capability. Nevertheless, MoS 2 suffers from low conductivity and large volume expansion upon the discharging/charging. In this work, MoS 2 nanoflakes were dispersed into a three-dimensional (3D) porous carbon framework by utilizing salt as hard template, obtaining a 3D porous MoS 2 /carbon composite. When employed as an anode material for SIBs, the composite shows large specific capacity, good rate capability and cycling stability. A large capacity of 361 mAh g −1 is achieved at 5.0 A g −1 and a capacity of 372 mAh g −1 is still well maintained at 0.5 A g −1 after 200 cycles. The 3D interconnected porous carbon framework is believed to improve the electrochemical performance through accelerating the transportation of electrons and ions, as well as suppressing the volume expansion upon the Na + insertion and preventing the active materials aggregation.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 26
·8697-8705
·
IF 4.099
Yang Ding,Jie Liu,Ming Zeng,Xishu Wang,Junli Shi,Weili Wang,Yanru Miao,Xibin Yu
Rare earth (RE3+)-doped NaY(MoO4)2 nanocrystals are efficient materials for realizing multicolor emission, which plays an important role in displays, W-LEDs, solar cells and biolabeling. Up to now, research on the multicolor tuning properties of RE3+-doped NaY(MoO4)2 nanoparticles has mostly focused on traditional preparation routes such as the hydrothermal method and sol–gel process. However, the products obtained using these methods are usually large in size (on the micron/submicron scale) and agglomeration problems are inevitable. With the development of nano optoelectronic devices and bioluminescence labeling, there is an urgent need to find an efficient method to prepare nanoscale, monodispersed and NaY(MoO4)2:RE3+ nanocrystals (NCs) with good crystallinity and stronger emission properties. In this work, we demonstrate a simple, fast, reproducible and one-step synthesis of NaY(MoO4)2:Eu3+ NCs with sizes varying from 1–20 nm via a ligand-assisted reprecipitation strategy. The reaction mechanism and emission intensities of NaY(MoO4)2:Eu3+ NCs with various morphologies have been discussed in detail. Furthermore, Tb3+ and Eu3+ ion co-doped NaY(MoO4)2 NCs were also prepared, and various emission colors were obtained and tuned from red, orange-red, yellow and yellow-green to green. Energy transfer between the Tb3+ and Eu3+ ions in the NaY(MoO4)2 host matrix has also been demonstrated. Finally, a highly efficient and stable NaY(MoO4)2:0.05Tb,0.04Eu NC-based W-LED device was built, which indicates the promising future application for this material in the field of lighting. The tunable multicolour emission, ease of preparation and nanosize reveal that NaY(MoO4)2:RE3+ NCs have a potential application in full color displays and W-LEDs.
研究领域:
材料科学
·
纳米技术
·
光学材料
·
无机化学
·
光电子学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2018
·
IF 5.667
Xiang Qin,Wenlin Feng,Xiaozhan Yang,Jianwei Wei,Guojia Huang
A molybdenum sulfide/citric acid composite membrane-coated long period fiber grating (LPFG) sensor was demonstrated and applied to detect the trace hydrogen sulfide gas. The sensor was fabricated by growing molybdenum sulfide/citric acid composite film on the surface of optical fiber grating by using the sol-gel and dip-coating techniques. The sensor measures the hydrogen sulfide concentration by monitoring the molecular adsorption-induced resonant wavelength shift of LPFG in near infrared (∼1555 nm) region. Experimental results show that with the increasing concentration of hydrogen sulfide, the transmission spectrum appears blue shift with time response of 89 s. In addition, a high sensitivity of 10.52 pm/ppm and a good linear relationship are achieved within a measurement range from 0 to 70 ppm. Furthermore, there is an excellent selectivity for H 2 S, which has also been confirmed by the surface adsorption energy results of molybdenum sulfide with five common gases in the air (H 2 S, N 2 , CO 2 , O 2 and Ar) based on the density functional theory calculations. The proposed sensor has an excellent detection limit of hydrogen sulfide which is as low as 0.5 ppm. This sensor has the advantages of simple structure, easy manufacture, high sensitivity and low cost, and can be used in hydrogen sulfide gas sensing places such as factories, sewers, and so on.
研究领域:
传感技术
·
材料科学
·
环境监测
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2016
·Vol. 40
·期 11
·9211-9222
·
IF 3.277
Bei Zhao,Li Yuan,Shanshan Hu,Xuemei Zhang,Xianju Zhou,Jianfeng Tang,Jun Yang
Novel Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors have been synthesized via a one-step hydrothermal route using glycine (Gly) as a surfactant. The phosphors were characterized using X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), photoluminescence (PL), and luminescence decays. It was found that various surfactants had a profound influence on the crystal phase, morphology and emission intensity of the final products. Furthermore, the photoluminescence of Ln3+-doped Sc2Mo3O12 phosphors (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) was studied in detail. The energy transfer of MoO42− → Tb3+ (Dy3+) → Eu3+ and multicolor tunable emission occurred by changing the ratio of Tb3+/Eu3+ or Dy3+/Eu3+ under single wavelength excitation. Moreover, the energy transfer mechanism from Tb3+ (Dy3+) to Eu3+ was ascribed to dipole–dipole interactions and the energy transfer efficiency from Tb3+ to Eu3+ (95.3%) was higher than that from Dy3+ to Eu3+ (87.5%). Their tunable multicolor luminescence properties make Sc2Mo3O12:Ln3+ (Ln = Eu, Tb, Dy, Tb/Eu, Dy/Eu) phosphors suitable for many potential applications in the fields of color displays and fluorescent lamps.
研究领域:
材料科学
·
无机化学
·
纳米材料
·
发光材料
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）