NATURE
·
2022
·Vol. 605
·期 7908
·69-75
·
IF 69.504
Liu Lei,Li Taotao,Ma Liang,Li Weisheng,Gao Si,Sun Wenjie,Dong Ruikang,Zou Xilu,Fan Dongxu,Shao Liangwei,Gu Chenyi,Dai Ningxuan,Yu Zhihao,Chen Xiaoqing,Tu Xuecou,Nie Yuefeng,Wang Peng,Wang Jinlan,Shi Yi,Wang Xinran
Two-dimensional transition-metal dichalcogenides (TMDs) are of interest for beyond-silicon electronics 1 , 2 . It has been suggested that bilayer TMDs, which combine good electrostatic control, smaller bandgap and higher mobility than monolayers, could potentially provide improvements in the energy-delay product of transistors 3 , 4 , 5 . However, despite advances in the growth of monolayer TMDs 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , the controlled epitaxial growth of multilayers remains a challenge 15 . Here we report the uniform nucleation (>99%) of bilayer molybdenum disulfide (MoS 2 ) on c -plane sapphire. In particular, we engineer the atomic terrace height on c -plane sapphire to enable an edge-nucleation mechanism and the coalescence of MoS 2 domains into continuous, centimetre-scale films. Fabricated field-effect transistor (FET) devices based on bilayer MoS 2 channels show substantial improvements in mobility (up to 122.6 cm 2 V −1 s −1 ) and variation compared with FETs based on monolayer films. Furthermore, short-channel FETs exhibit an on-state current of 1.27 mA μm −1 , which exceeds the 2028 roadmap target for high-performance FETs 16 .
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JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 12
·120542
·
IF 4.316
Ke Qu,Yuqi Bai,Miao Deng
The ever-increasing need for small and lightweight power sources for use in portable or wearable electronic devices has spurred the development of supercapacitors as a promising energy storage and conversion system. In this work, a simple, facile and easy-to-practice method has been developed to employ carbon paper (CP) as the support to coat molybdenum disulfide (MoS2) and graphene oxide (GO), followed by electrodeposition of polyaniline (PANI) to render CP/MoS2-GO-PANI. The preparation parameters, such as amounts of MoS2, GO and number of aniline electropolymerization cycles, have been optimized to render CP/MoS2-GO-PANI the best capacitive performance. The as-prepared optimal CP/MoS2-GO-PANI is characterized by X-ray powder diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and X-ray photoelectron spectroscopy. The supercapacitive properties of CP/MoS2-GO-PANI as an electrode have been evaluated electrochemically via cyclic voltammetry, galvanostatic charge/discharge, and electrochemical impedance spectroscopy testing. CP/MoS2-GO-PANI delivers a specific capacitance of 255.1 F g−1 at 1.0 A g−1 and exhibits excellent rate capability under larger current densities. Moreover, a symmetrical supercapacitor is assembled and three are connected in series to power a light-emitting diode for ∼15 min, demonstrating the promising application potential of CP/MoS2-GO-PANI-based supercapacitor.
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MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-12
·
IF 5.833
Zhong Yaping,Zou Yibiao,Yang Xianhong,Lu Zhentan,Wang Dong
A rapid and facile method is reported for the detection of ascorbic acid using molybdenum disulfide quantum dots (MoS 2 QDs) as a fluorescence sensor. Water-soluble and biocompatible MoS 2 QDs with the maximum fluorescence emission at 506 nm have been successfully synthesized by hydrothermal method and specific detection for ascorbic acid (AA) was constructed to utilize the modulation of metal ion on the fluorescence of MoS 2 QDs and the affinity and specificity between the ligand and the metal ion. The fluorescence of MoS 2 QDs was quenched by the irreversible static quenching of Fe 3+ through the formation of a MoS 2 QDs/Fe 3+ complex, while the pre-existence of AA can retain the fluorescence of MoS 2 QDs through the redox reaction between AA and Fe 3+ . Based on this principle, a good linear relationship was obtained in the AA concentration range 1 to 150 μM with a detection limit of 50 nM. The proposed fluorescent sensing strategy was proven to be highly selective, quite simple, and rapid with a requirement of only 5 min at room temperature (RT), which is particularly useful for rapid and easy analysis. Satisfactory results were obtained when applied to AA determination in fruits, beverages, and serum samples as well as AA imaging in living cells, suggesting its great potential in constructing other fluorescence detection and imaging platforms. Graphical abstract
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 6
·7237-7248
·
IF 2.478
Hu Rong,Huang Zongyu,Wang Bo,Qiao Hui,Qi Xiang
Two-dimensional (2D) molybdenum disulfide (MoS 2 ) nanomaterials have emerged as promising candidates for constructing excellent supercapacitors, but the lack of large-scale, efficient and low-cost methods for preparing MoS 2 nanosheets severely hinders its practical application. This study demonstrates an accessible and efficient approach for electrochemical exfoliating bulk MoS 2 into high-quality MoS 2 nanosheets with size distribution in the range of 1–3 μm and a thickness of several nanometers in an easily available inorganic salt solution. Furthermore, we construct symmetric all-solid-state supercapacitors based on exfoliated MoS 2 nanosheets. The 2D structure will provide stable channels to facilitate the intercalation/desorption of ions during charge and discharge, and to a certain extent can prevent deposition and agglomeration. Therefore, compared with the unexfoliated MoS 2 , as-prepared MoS 2 nanosheets show great improvement in supercapacitor performance (the specific capacitance increases from the original 130 F g −1 to 215 F g −1 at 5 A g −1 , for instance). In detail, the electrode possesses a specific capacitance of 285 F g −1 at a current density of 2 A g −1 and maintains the great capacitance retention of 83.8% at 8 A g −1 . Moreover, the supercapacitor exhibits a high energy density of 136.8 Wh kg −1 at a power density of 2550 Wh kg −1 . This work provides basic research on the preparation of 2D nanomaterials by electrochemical exfoliation.
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ACS Applied Bio Materials
·
2023
·
IF 4.7
Yuetong Kang,Yun Zhang,Xinrui Li,Xiaoyu Wang,Jingqi Zhang,Lidong Li
Molybdenum-based nanomaterials with variable oxidation states can be developed as nanozyme catalysts. In this work, we developed a one-pot method for the preparation of molybdenum disulfide assisted by protein. Protamine was used as a cationic template to link molybdate anions and form complexes. During hydrothermal synthesis, protamine can affect the nucleation process of molybdenum disulfide and inhibit their aggregation, which facilitates the fabrication of small-sized molybdenum disulfide nanoparticles. Moreover, the abundant amino/guanidyl groups of protamine could both physically adsorb and chemically bond to molybdenum disulfide and further modulate the crystal structures. The optimized size and crystalline structure enabled a higher exposure of active sites, which enhanced the peroxidase-like activity of molybdenum disulfide/protamine nanocomposites. Meanwhile, the antibacterial activity of protamine was retained in the molybdenum disulfide/protamine nanocomposites, which could synergize with the peroxidase-like activity of molybdenum disulfide to kill bacteria. Therefore, the molybdenum disulfide/protamine nanocomposites are good candidates for antibacterial agents with lower chances of antimicrobial resistance. This study establishes an easy way to design artificial nanozymes by compounding suitable components.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 4
·1-8
·
IF 5.705
Liu Xinnan,Zhang Wentao,Huang Lunjie,Hu Na,Liu Wei,Liu Yingnan,Li Sihang,Yang Chengyuan,Suo Yourui,Wang Jianlong
A method is described for the rapid fluorometric determination of dopamine (DA) by using molybdenum disulfide quantum dots (MoS 2 QDs) that were fabricated via an ammonium hydroxide etching method. The probe has a fluorescence (with excitation/emission peaks at 267/380 nm) that is quenched by DA with high selectivity over various interferences. This is attributed to a reaction that occurs between DA and the molybdate ions in pH 9 solutions of MoS 2 QDs. The formation of organic molybdate complexes and of dopamine-quinone results in strong quenching of the fluorescence of the QDs which is due to both electron transfer and an inner filter effect. Under the optimum conditions, the assay works in the 0.1–100 μM DA concentration range, with two linear ranges and a 10 nM detection limit. The method was applied to the determination of DA in spiked artificial urine samples, where it gave recoveries ranging from 97.6 to 102.2%, demonstrating that the method a promising tool for rapid and selective detection of DA.
MoS 2 QDs are facilely synthesized via the etching effect of ammonium hydroxide for highly selective fluorometric detection of dopamine.
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Energy Material Advances
·
2024
·
IF 14.8
Qinglin Li,Ping Li,Yanke Li,Saiyaer Sidike,Yueling Xu,Yuchen Wang,Zhi Hu,Mingming Guo,Hanqi Zhang,Yichuan Zhang
Earth-abundant molybdenum disulfide (MoS2) shows a high application potential in thermoelectric (TE) field owing to its high Seebeck coefficient. However, the main obstacle to achieve high TE performance for the MoS2 material is its poor electrical conductivity. In this work, the flexible MoS2/single-walled carbon nanotube (SWCNT) films with enhanced TE performance were fabricated via hydrothermal reaction, solution mixing, and subsequent vacuum filtration. The strong S–π interaction and the energy filtering effect at the MoS2/SWCNT interface produced an impressive power factor value of 107.99 ± 4.98 μW·m−1·K−2 for the MoS2/SWCNT composite films. In addition, the TE performance had high stability on bending deformation. Finally, at a temperature difference of 50 K, the assembled TE device of MoS2/SWCNT films exhibited good output performance. This work provides a feasible reference to optimize the TE performance of MoS2 materials and demonstrates a high potential of flexible MoS2-based composites in TE applications.
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Scientific Reports
·
2018
·Vol. 8
·期 1
·1-8
·
IF 4.122
Asokan Vijayshankar,Zhu Dancheng,Huang Wei,Wang Hulian,Gao Wandong,Zhang Ze,Jin Chuanhong
In the present study, a novel method has been carried out to grow tungsten (W) doped molybdenum disulfide (MoS 2 ) on the graphene transferred TEM grid in a chemical vapor deposition (CVD) setup. Tungsten trioxide (WO 3 ) has been used as a source for ‘W’ while ‘Mo’ has been derived from Mo based substrate. Different experimental parameters were used in this experiment. Higher gas flow rate decreases the size of the sample flake and on other side increases the dopant concentrations. The interaction mechanism between Mo, S, W and oxygen (O) have been explored. The influence of oxygen seems to be not avoidable completely which also imposes effective growth condition for the reaction of Mo with incoming sulfur atoms. The difference in the migration energies of Mo, WO 3 , S clusters on the graphene and the higher reactivity of Mo clusters over other possibly formed atomic clusters on the graphene leads to the growth of W doped MoS 2 monolayers. Formation of MoS 2 monolayer and the nature of edge doping of ‘W’ is explained well with the crystal model using underlying nucleation principles. We believe our result provide a special route to prepare W doped MoS 2 on graphene substrate in the future.
研究领域:
材料科学
·
纳米技术
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Ming-Xiao Zhu,Zhi-Hao Xing,Yi-Fei Li,Bing Xia,Hai-Long He,Xue-Kai Xu,Ji-Ming Chen
Epoxy-based materials are widely utilized in electrical and electronic equipment due to their favorable insulation and mechanical properties. However, high-voltage stress and compact design in these apparatuses impose strict requirements for higher dielectric strength. In this work, a novel promising nanofiller, namely, nano-diodes of molybdenum sulfide (MoS 2 ), was introduced to enhance the electrical properties of epoxy, and five groups of MoS 2 -doped epoxy composites with varying concentrations were prepared. A series of electrical insulation properties, including dielectric parameters, breakdown strength, and trap characteristics, were tested. The results indicated that the breakdown strength of the composite with 0.3% MoS 2 increased by 34.93% compared to pure epoxy resin. In addition, the insulation performance of the composite materials showed an initially increasing and then decreasing trend with MoS 2 concentration. The enhancement of insulation properties can be attributed to the charge traps introduced by the MoS 2 fillers. The results proved that the comprehensive performances of EP-based nanocomposites were effectively improved by MoS 2 nanoparticles, showing great application potential in high-voltage insulated power equipment.
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RSC Advances
·
2016
·Vol. 6
·期 64
·59816-59822
·
IF 3.289
Song Hao,Bingchu Yang,Yongli Gao
The fracture behavior of two-dimensional polycrystalline molybdenum disulfide (MoS2) films is essential to device performance and has attracted tremendous attention in recent years. Here, we investigate the mixed intergranular and transgranular fracture behaviors of CVD-grown polycrystalline MoS2 atomic layers using multiple techniques. The underlying mechanism is proposed to be that micro-cracks initially nucleate at grain boundary junctions and propagate along with the grain boundaries, resulting in intergranular fracture behavior. On the other hand, as-existed sulfur vacancies serve as crack nuclei and propagate along energy preference directions through Mo–S bond breaking, resulting in transgranular fracture behavior. Lattice shrinking induced compressive, rather than tensile strain is residual in fractured MoS2 microflakes, which enlarges the corresponding bandgap by ∼200 meV. Our work deepens the understanding of the fracture behaviors of polycrystalline MoS2 atomic layers and demonstrates a promising method to engineer the strain in MoS2-like atomically-thin materials to further tune their physical properties.
研究领域:
材料科学
·
物理学
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ACS Biomaterials Science & Engineering
·
2022
·
IF 5.395
Qin Liu,Ping Song,Weiwei Zhang,Zhenyu Wang,Kai Yang,Jianquan Luo,Longbao Zhu,Lin Gui,Yugui Tao,Fei Ge
The combination of multiple treatments has recently been investigated for tumor treatment. In this study, molybdenum disulfide (MoS2) with excellent photothermal conversion performance was used as the core, and manganese dioxide (MnO2), which responds to the tumor microenvironment, was loaded on its surface by liquid deposition to form a mesoporous core–shell structure. Then, the chemotherapeutic drug Adriamycin (DOX) was loaded into the hole. To further enhance its water solubility and stability, the surface of MnO2 was modified with mPEG-NH2 to prepare the combined antitumor nanocomposite MoS2@DOX/MnO2-PEG (MDMP). The results showed that MDMP had a diameter of about 236 nm, its photothermal conversion efficiency was 33.7%, and the loading and release rates of DOX were 13 and 65%, respectively. During in vivo and in vitro studies, MDMP showed excellent antitumor activity. Under the combined treatment, the tumor cell viability rate was only 11.8%. This nanocomposite exhibits considerable potential for chemo-photothermal combined antitumor therapy.
研究领域:
纳米技术
·
癌症研究
·
材料科学
·
药学
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高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2023
·Vol. 129
·期 10
·1-14
·
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.
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