APPLIED PHYSICS LETTERS
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2017
·Vol. 110
·期 12
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IF 3.411
Zhuang YuKai,Dai LiDong,Wu Lei,Li HePing,Hu HaiYing,Liu KaiXiang,Yang LinFei,Pu Chang
This report presents a pressure-induced permanent metallization for MoS 2 under non-hydrostatic conditions. Impedance and Raman spectra were measured to study the pressure-induced structural and electronic transformations of MoS 2 at up to ∼25 GPa in diamond anvil cells under both non-hydrostatic and hydrostatic conditions. The results show evidence for isostructural hexagonal distortion from 2 Hc to 2 Ha and metallization at ∼17 GPa and ∼20 GPa under non-hydrostatic and hydrostatic conditions, respectively. Interestingly, the metallization is irreversible only under non-hydrostatic compression. We attribute this phenomenon to the incorporation of molecules of pressure medium between layers, which mitigate compressed stress and reduce interlayer interaction.
研究领域:
材料科学
·
物理学
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2023
·Vol. 129
·期 10
·1-14
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IF 2.7
Shi Lin,Bi Qinling,Zhu Jiamei,Yan Shili,Chen Dongxiang
A magnetic molybdenum disulfide (Fe–Fe 2 O 3 @PDA@MoS 2 ) was prepared and evaluated as a dispersive viscosity reducing catalyst for the heavy oil. The catalysts were analyzed using a variety of characterization methods, and the effects of preparation method and oleic acid treatment on performance were also compared. The particle size of Fe–Fe 2 O 3 magnetic nanochains was about 80 nm, the saturation magnetization strength was 110 emu/g, and the components in the nanochains were mainly iron elements. The catalyst further prepared by liquid phase precipitation had unique flower-like structure and good viscosity reduction ability. The loading amount of MoS 2 was 16.7 wt% and the saturation magnetization was 36.3 emu/g, while the saturation magnetization of the oleic acid treated sample was 28.9 emu/g. The as-prepared Fe–Fe 2 O 3 @PDA@MoS 2 can reach more than viscosity reduction 99% under 10 MPa hydrogen pressure and 400 ~ 415 °C. In addition, the component analyses of four groups (saturate, aromatic, resin, and asphaltenes) for the liquid products in the heavy oil were conducted to analysis the mechanism of viscosity reduction of catalyst.
研究领域:
催化化学
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材料科学
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石油加工工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Jing Yang,Shun-Feng Jiang,Wei-Fei Hu,Hong Jiang
The efficient elimination of biotoxicity of halogenated antibiotics by electrochemical dehalogenation pretreatment is required by a subsequent biochemical treatment process. Molybdenum disulfide (MoS 2 ) has been applied as an efficient catalyst for the hydrogen evolution and water splitting, without any investigation in electrochemical dehalogenation, particularly under complex environmental conditions. In this study, ultrathin MoS 2 nanosheets are fabricated via a simple one-step hydrothermal process, and proved as a promising catalyst for enhancing electrochemical dehalogenation of halogenated antibiotics of a chlorinated antibiotic florfenicol (FLO) under relevant environmental conditions. Results showed that the reaction rate constant of the ultrathin MoS 2 electrode (0.0135 min −1 ) was 4.1- and 28- fold higher than those of commercial MoS 2 and bare carbon paper, respectively, and the biotoxicity of treated effluent could almost be neglected. Free radical scavenging experiments and electrochemical performance test suggested that the dechlorination of FLO on ultrathin MoS 2 electrode was synergistically accomplished via the direct electron transfer and indirect reduction of active H*. Environmental conditions, namely, dissolved oxygen and humic acid had only a slight effect on the dechlorination efficiency. Electrochemical dechlorination of FLO was a gradual dechlorination process and FLO-2Cl (representing the removal of two chlorine atoms from FLO) was the final main product. Besides, the ultrathin MoS 2 electrode retained a good stability and the energy consumption of the ultrathin MoS 2 cathode at −1.2 V was 0.02643 kWh g −1 , more than those of commercial MoS 2 cathode and bare carbon paper. This study develops a new application of noble-metal-free electrode material for electrochemical dechlorination in wastewater.
研究领域:
环境科学
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催化材料
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DOI
高影响因子
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
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2016
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IF 1.904
Song Hao,Bingchu Yang,Yongli Gao
Monolayer MoS 2 is an emerging two-dimensional semiconductor with wide-ranging potential applications in novel electronic and optoelectronic devices. Here, we reported controlled vapor phase growth of hybrid spiral-like MoS 2 crystals investigated by multiple means of X-Ray photoemission spectroscopy, scanning electron microscopy, atomic force microscopy , kelvin probe force microscopy, Raman and Photoluminescence techniques. Morphological characterizations reveal an intriguing hybrid spiral-like MoS 2 feature whose lower planes are AB Bernal stacking and upper structure is spiral. We ascribe the hybrid spiral-like structure to a screw dislocation drive growth mechanism owing to lower supersaturation and layer-by-layer growth mode. In addition, the electrostatic properties of MoS 2 microflakes with hybrid spiral structures are obvious inhomogeneous and dependent on morphology manifested by kelvin probe force microscopy. Our work deepens the understanding of growth mechanisms of CVD-grown MoS 2 , which is also adoptable to other TMDC materials.
研究领域:
材料科学
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纳米技术
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半导体物理
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DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2024
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IF 5.7
Chuanlin Huang,Wenjuan Zhou,Weijiang Guan,Nengsheng Ye
Background Luminol chemiluminescence (CL) sensing system remains an excellent candidate for application in bioanalysis due to its good water solubility. However, traditional luminol CL system usually requires the addition of oxidizing agents and sensitizers to obtain high efficiency for the improvement of detection sensitivity. Although numerous studies on the nanomaterial-enhanced luminol CL systems have been carried out, there is still great potential to develop inexpensive, readily available and easily handled catalysts to construct simple and effective CL platform for biomolecular sensing. Results Few-layered MoS 2 nanosheets (NS) prepared by sonication-assisted exfoliation of commercially available bulk MoS 2 were found to significantly enhance the CL of luminol‒dissolved oxygen in the absence of additional oxidants. The mechanism study demonstrated that exfoliated MoS 2 NS could catalyze the decomposition of dissolved oxygen by virtue of its exposed active sites on the surface, generating increased reactive oxygen intermediates, which then oxidize luminol and produce intense CL emission. The proposed high-efficiency luminol CL system was then employed for the extremely sensitive identification of dopamine based on the quenching of CL by dopamine. The limit of detection (LOD) for dopamine can be as low as 2.07 nM. Besides, it also works well in the actual urine sample with good recoveries (99.6–100.6 %), confirming the practicability of the method. Significance As a new type of CL catalyst, MoS 2 NS developed in this work are easy to obtain, simple to prepare and can be produced in large quantities, which lays a foundation for extending applicability of MoS 2 NS in the CL field, and provides a new idea for developing simple and highly sensitive CL sensing system.
研究领域:
分析化学
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生物化学
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材料科学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 11
·1-10
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IF 5.3
Wang Qian,Hu Rongjing,Zhao Huifang,He Xiaojing,Zhang Ruiping,Dong Yongqiang
Coin-metal@semiconductor nanohybrids have attracted extensive attention in surface-enhanced Raman scattering (SERS) detection, aiming to achieve the synergistic effect of electromagnetic enhancement mechanism (EM) and chemical enhancement mechanism (CM). In this work, positively charged thin-layered molybdenum disulfide nanosheets (MoS 2 NSs) and negatively charged gold nanoparticles (AuNPs) were synthesized, which were further fabricated into MoS 2 NSs@AuNPs via electrostatic interactions and Au–S bonding. The approach is quite rapid, cost-effective, and environmentally friendly, and the resulting MoS 2 NSs@AuNPs exhibited an outstanding SERS enhancement factor of up to 2.33 × 10 8 for crystal violet due to the synergistic effect of EM and CM. Furthermore, the fabricated SERS substrate demonstrated long-term stability, maintaining about 80% of SERS activity even after storage for two months, and excellent reproducibility, with a relative standard deviation of 5.20%. Remarkably, this SERS-active nanohybrid enabled rapid and highly sensitive detection of thiram residues in apple juice, achieving satisfactory recoveries of 82.6–110.7% and an impressively low limit of quantification of 50 µg/L. This work not only presents a novel strategy for designing high-performance SERS nanomaterials but also highlights their promising applications in food safety monitoring and environmental analysis. Graphical
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高影响因子
Nature Nanotechnology
·
2021
·Vol. 16
·期 11
·1201-1207
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IF 39.213
Li Taotao,Guo Wei,Ma Liang,Li Weisheng,Yu Zhihao,Han Zhen,Gao Si,Liu Lei,Fan Dongxu,Wang Zixuan,Yang Yang,Lin Weiyi,Luo Zhongzhong,Chen Xiaoqing,Dai Ningxuan,Tu Xuecou,Pan Danfeng,Yao Yagang,Wang Peng,Nie Yuefeng,Wang Jinlan,Shi Yi,Wang Xinran
Two-dimensional (2D) semiconductors, in particular transition metal dichalcogenides (TMDCs), have attracted great interest in extending Moore’s law beyond silicon 1 , 2 , 3 . However, despite extensive efforts 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , the growth of wafer-scale TMDC single crystals on scalable and industry-compatible substrates has not been well demonstrated. Here we demonstrate the epitaxial growth of 2 inch (~50 mm) monolayer molybdenum disulfide (MoS 2 ) single crystals on a C-plane sapphire. We designed the miscut orientation towards the A axis (C/A) of sapphire, which is perpendicular to the standard substrates. Although the change of miscut orientation does not affect the epitaxial relationship, the resulting step edges break the degeneracy of nucleation energy for the antiparallel MoS 2 domains and lead to more than a 99% unidirectional alignment. A set of microscopies, spectroscopies and electrical measurements consistently showed that the MoS 2 is single crystalline and has an excellent wafer-scale uniformity. We fabricated field-effect transistors and obtained a mobility of 102.6 cm 2 V −1 s −1 and a saturation current of 450 μA μm –1 , which are among the highest for monolayer MoS 2 . A statistical analysis of 160 field-effect transistors over a centimetre scale showed a >94% device yield and a 15% variation in mobility. We further demonstrated the single-crystalline MoSe 2 on C/A sapphire. Our method offers a general and scalable route to produce TMDC single crystals towards future electronics.
研究领域:
材料科学
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半导体物理
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纳米技术
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电子学
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DOI
高影响因子
Applied Sciences-Basel
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2020
·Vol. 10
·期 14
·4758
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IF 2.474
Xujing Ji,Manjunath Nallappagari Krishnamurthy,Danhui Lv,Jixue Li,Chuanhong Jin
Mirror twin boundaries (MTBs) have brought intriguing one-dimensional physics into the host 2D crystal. In this letter, we reported a chalcogen atom exchange route to induce MTBs into as-formed MoS2monolayers via post-synthesis tellurium doping. Results from annular dark-field scanning transition electron microscope (ADF-STEM) characterizations revealed that tellurium substituted the sulfur sublattices of MoS2preferentially around the edge areas. A large number of MTBs in a configuration of 4|4P-Te was induced therein. Analysis of the lattice structures around MTBs revealed that such a tellurium-substitution-induced MTB formation is an energy-favored process to reduce the strain upon a high ratio of tellurium doping.
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Nano Research
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2018
·Vol. 11
·期 11
·5849-5857
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IF 7.994
Huang Wei,Wang Xiaowei,Ji Xujing,Zhang Ze,Jin Chuanhong
Edge structures are highly relevant to the electronic, magnetic, and catalytic properties of two-dimensional (2D) transition metal dichalcogenides (TMDs) and their one-dimensional (1D) counterparts, i.e., nanoribbons, and should be precisely tailored for the desired application. In this work, we report the formation of novel Mo 6 S 6 nanowire (NW)-terminated edges in monolayer molybdenum disulfide (MoS 2 ) via an e–beam irradiation process combined with high temperature heating. The atomic structures of the NW-terminated edges and the dynamic formation process were observed experimentally using scanning transmission electron microscopy. Further analysis showed that the NW-terminated edge could be formed on both the Mo-zigzag (ZZ) edge and S-ZZ edge and could exhibit a stability superior to that of the pristine ZZ and armchair (AC) edges. In addition, analogous edge structures could also be formed in MoS 2 nanoribbons and other TMD materials such as Mo x W 1− x Se 2 . We believe that these novel edge structures may impart novel properties to the 2D and 1D TMD materials and provide new opportunities for their applications in catalytic, spintronic, and electronic devices.
研究领域:
材料科学
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纳米技术
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凝聚态物理
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电子显微学
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催化
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自旋电子学
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二维材料
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DOI
高影响因子
CHINESE CHEMICAL LETTERS
·
2019
·Vol. 31
·期 8
·2099-2102
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IF 3.839
Xin Yu,Ding Wang,Yuqiu Wang,Ji Yan,Xianying Wang
In this work, the two-dimensional MoS 2 film was prepared by sulfuring the molybdenum atomic layer on SiO 2 /Si substrate. The reaction temperature, heating rate, holding time and carrier gas flow rate were investigated comprehensively. The quality of MoS 2 film was characterized by optical microscopy, atomic force microscopy, Raman and photoluminescence spectroscopy. The characterization results showed that the optimum synthesis parameters were heating rate of 25 °C/min, reaction temperature of 750 °C, holding time of 30 min and carrier gas velocity of 100 sccm. The MoS 2 gas sensor was fabricated and its gas sensing performance was tested. The test results indicated that the sensor had a good response to both reducing gas (NH 3 ) and oxidizing gas (NO 2 ) at room temperature. The sensitivity to 100 ppm of NO 2 was 31.3%, and the response/recovery times were 4 s and 5 s, respectively. In addition, the limit of detection could be as low as 1 ppm. This work helps us to develop low power and integrable room temperature NO 2 sensors.
研究领域:
材料科学
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纳米科技
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传感器技术
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环境监测
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半导体物理
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DOI
高影响因子
ACS Applied Nano Materials
·
2021
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IF 5.097
Wei Cai,Yulu Zhu,Xiaowei Mu,Zhaoxin Li,Junling Wang,Yuan Hu,Xin Wang,Lei Song
The heterolayered architecture design is capable of assembling different nanomaterials into a multifunctional nanohybrid. Herein, based on an electrostatic-driven self-assembly process, polyaniline-modified boron nitride (BN/PANI) nanosheets are fixated onto the surface of molybdenum disulfide (MoS2) nanosheets, thus forming a multifunctional heterolayered architecture nanohybrid. Based on the barrier effect of BN nanosheets and the Lewis acid catalysis effect and the chain rearrangement effect of MoS2, the prepared BN/PANI/MoS2 presents a desirable enhancement effect in the flame retardancy and toxic smoke suppression of epoxy resins. Meanwhile, in a high-temperature environment, the charge carrier produced by MoS2 nanosheets is rapidly transferred by electric BN/PANI, thus accelerating the formation of a protective char layer. It was found that 5.0 wt % addition of BN/PANI/MoS2, respectively, leads to decreases of 23.7, 9.1, 11.1, and 29.9% to the peak heat release rate, total heat release, peak smoke release rate, and total smoke release. In this work, in terms of the design of heterolayered architecture, the unique function of solo nanomaterial is effectively integrated to obtain the optimal effect, thus promoting the application of nanohybrids in polymer composites.
研究领域:
材料科学
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化学工程
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高影响因子
Biomaterials Science
·
2020
·Vol. 9
·期 9
·3306-3318
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IF 6.183
Shuguang Yang,Dejian Li,Liang Chen,Xiaojun Zhou,Liwen Fu,Yanling You,Zhengwei You,Li Kang,Maoquan Li,Chuanglong He
The superior properties of metal organic frameworks (MOF) can provide great opportunities for merging functional nanoparticles to construct smart and versatile cancer theranostic agents. In this study, on the basis of non-mesoporous nanoparticles (molybdenum disulfide, MoS2), the structure of the MOF shell layer with an adjustable structure can be constructed through the natural coordination interaction between polydopamine (PDA) and iron ion, and the tumor cell target ligand was modified on the surface of the nanocomposite after loading the anticancer drug doxorubicin hydrochloride (DOX) to form a multifunctional cancer theranostics nanoplatform (DOX@MoS2-PMA). Benefiting from the excellent properties of MoS2 and MOF, the favorable photothermal properties and pH/near-infrared (NIR) laser-triggered DOX release behavior of composite nanoparticles were demonstrated. Its well-defined nanostructure, adequate colloidal stability, and satisfactory biocompatibility were further evidenced. Furthermore, the selective tumor cell targeting ability of DOX@MoS2-PMA can improve the cellular uptake efficacy and the photothermal-chemotherapy combination therapy can significantly enhance the killing effect on cancer cells both in vitro and in vivo. In addition, fluorescence imaging results show that nanoparticles can efficiently accumulate inside tumors. The photoacoustic (PA) and magnetic resonance (MR) imaging capabilities derived from different components of nanoparticles can perform better imaging effects. To the best of our knowledge, this is the first attempt to merge the performance of MoS2 with MOF for PA/MR dual-modality imaging-guided photothermal-chemotherapy combination therapy. Our work presented herein proves that MOF can be combined with non-mesoporous nanoparticles and exhibits excellent performance, thus opening a new avenue for endowing non-mesoporous nanoparticles with an efficient drug loading capacity and practical applications of MOFs in nanomedicine.
研究领域:
纳米医学
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癌症研究
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材料科学
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生物医学工程
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）