VACUUM
·
2024
·
IF 3.8
Lianbi Li,Lihan Wang,Binbin Ding,Denghui Yan,Zelong Li,Xiaolong Ren,Yuan Zang,Song Feng,Zebin Li,Guoqing Zhang,Qinglong Fang,Caijuan Xia
Transition-metal dichalcogenides (TMDs) show great potential for next-generation semiconductor due to its atomic level thickness, tunable band gap and high carrier mobility. However, high-quality monolayer MoS 2 (ML-MoS 2 ) films require stringent growth conditions during preparation. Here, we report a face-to-face metal precursor supply approach during chemical vapor deposition (CVD) to batch production of uniform ML-MoS 2 films. Mo foils provide a stable concentration of metal precursors leading to uniform film generation with low nucleation. Comprehensive characterization techniques, including spectroscopic, surface topography and atomic scale analysis confirm the centimeter-scale homogeneity and high crystallographic quality of the monolayer films. Back-gate field effect transistors (FET) fabricated by ML-MoS 2 exhibit excellent electrical performance. This methodology provides a pathway for the growth of TMDs, which should promote their applications in high-performance electronics or other fields.
研究领域:
材料科学
·
半导体物理
·
纳米技术
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2024
·
IF 4.3
Kaiyu Liu,Hongwei Zhang,Yutong Qin,Chuntao Lan,Hao Jia
Developing high-performance electromagnetic interference (EMI) shielding materials with robust microwave attenuation capabilities and structural stability remains a formidable challenge to enhance their practical adaptability in everyday scenarios. In this study, we have successfully fabricated a gradient structured MXene-based composite film tailored for high-performance EMI shielding. Initially, a hybrid MoS 2 @MXene material featuring heterointerfaces is synthesized, which exhibits exceptional electromagnetic wave (EMW) absorption capabilities. Subsequently, a gradient structured multi-layer film is engineered using a layer-by-layer casting approach, gradually increasing the MXene content in the MoS 2 @MXene/MXene/aramid nanofiber composite. This composite film is purposefully designed to employ an “absorb-reflect-reabsorb” EMI shielding mechanism, resulting in reduced reflection power. The resultant composite film achieves an impressive EMI SE of 50.9 dB, coupled with remarkable structural stability persisting through 500 folding cycles. This study presents a viable and potent strategy for developing flexible, absorption-dominant EMI shielding materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Shiyao Yan,Shiping Shao,Yunxiang Tang,Xin Zhang,Chan Guo,Luxue Wang,Jiurong Liu,Lili Wu,Fenglong Wang
Aerogel-based composites, renowned for their three-dimensional (3D) network architecture, are gaining increasing attention as lightweight electromagnetic (EM) wave absorbers. However, attaining high reflection loss, broad effective absorption bandwidth (EAB), and ultrathin thickness concurrently presents a formidable challenge, owing to the stringent demands for precise structural regulation and incorporation of magnetic/dielectric multicomponents with synergistic loss mechanisms within the 3D networks. In this study, we successfully synthesized a 3D hierarchical porous Fe3O4/MoS2/rGO/Ti3C2Tx MXene (FMGM) composite aerogel via directional freezing and subsequent heat treatment processes. Owing to their ingenious structure and multicomponent design, the FMGM aerogels, featured with abundant heterogeneous interface structure and magnetic/dielectric synergism, show exceptional impedance matching characteristics and diverse EM wave absorption mechanisms. After optimization, the prepared ultralight (6.4 mg cm–3) FMGM-2 aerogel exhibits outstanding EM wave absorption performance, achieving a minimal reflection loss of −66.92 dB at a thickness of 3.61 mm and an EAB of 6.08 GHz corresponding to the thickness of 2.3 mm, outperforming most of the previously reported aerogel-based absorbing materials. This research presents an effective strategy for fabricating lightweight, ultrathin, highly efficient, and broad band EM wave absorption materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Bioresources and Bioproducts
·
2020
·
IF 0
Dubin Dong
MnO 2 @MoS 2 /Polypyrrole ternary composite is prepared through hydrothermal methods and a simple oxidation process by using MnO 2 @MoS 2 sheet as the substrate and polypyrrole. The ternary composite serves as an electrode for pseudocapacitor which has more superior electrochemical properties compared with the binary complex. The supercapacitor electrode consists of two dimensional MoS 2 layers as load skeleton, MnO 2 providing electrochemical performance and polypyrrole improving high electric conductivity. These three components form a compact structure and synergistic effect leads to enhancing sufficient oxidation reduction for supercapacitor performance. Hence, MnO 2 @MoS 2 / Polypyrrole structure possesses higher specific capacitance of 490 F/g at a current density of 1 A/g and excellent cycling stability of 90% after 1000 cycles at 1 A/g. Here, Polypyrrole is also used as the bender material, exhibiting mechanical flexibility for electrode. The results of this study provides a simple method to produce an effective material for flexible pseudocapacitor electrodes for higher energy storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
Energy & Environmental Materials
·
2023
·Vol. 7
·期 4
·e12682
·
IF 15
Deliang Cheng,Wenbiao Zhang,Yi Tang,Qingsheng Gao,Renzong Hu,Lichun Yang,Min Zhu
SnO 2 , with its high theoretical capacity, abundant resources, and environmental friendliness, is widely regarded as a potential anode material for lithium-ion batteries (LIBs). Nevertheless, the coarsening of the Sn nanoparticles impedes the reconversion back to SnO 2 , resulting in low coulombic efficiency and rapid capacity decay. In this study, we fabricated a heterostructure by combining SnO 2 nanoparticles with MoS 2 nanosheets via plasma-assisted milling. The heterostructure consists of in-situ exfoliated MoS 2 nanosheets predominantly in 1 T phase, which tightly encase the SnO 2 nanoparticles through strong bonding. This configuration effectively mitigates the volume change and particle aggregation upon cycling. Moreover, the strong affinity of Mo, which is the lithiation product of MoS 2 , toward Sn plays a pivotal role in inhibiting the coarsening of Sn nanograins, thus enhancing the reversibility of Sn to SnO 2 upon cycling. Consequently, the SnO 2 /MoS 2 heterostructure exhibits superb performance as an anode material for LIBs, demonstrating high capacity, rapid rate capability, and extended lifespan. Specifically, discharged/charged at a rate of 0.2 A g −1 for 300 cycles, it achieves a remarkable reversible capacity of 1173.4 mAh g −1 . Even cycled at high rates of 1.0 and 5.0 A g −1 for 800 cycles, it still retains high reversible capacities of 1005.3 and 768.8 mAh g −1 , respectively. Moreover, the heterostructure exhibits outstanding electrochemical performance in both full LIBs and sodium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Jiguo Tu,Xiang Xiao,Mingyong Wang,Shuqiang Jiao
In this work, hierarchical flower-like MoS2 microspheres synthesized through a facile hydrothermal approach are used as a cathode for aluminum-ion batteries. They exhibit an initial specific discharge capacity of 153.6 mAh g–1 at a current density of 50 mA g–1 and deliver a stable capacity of 112.2 mAh g–1 with a Coulombic efficiency of 92.4% over 100 cycles on account of the unique hierarchical structure, which provides abundant space for aluminum storage. Moreover, the characterization results confirm that Al3+ ions can be intercalated into the MoS2 phase to form AlxMoS2 during the discharge process. The density functional theory calculation results indicate that the structure of MoS2 can be stabilized during the intercalation/deintercalation process.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Zhuannian Liu,Benlong Wei,Kai Liu,Liping Wang
Molybdenum disulfide (MoS 2 ), as an appealing Faradaic material for efficient capacitive deionization (CDI), is limited by unsatisfactory electrical conductivity, inferior removal rate, and restacking. Herein, we develop a CNT/PPy/MoS 2 ternary composite using a robust 3D conductive interconnected structure CNT/PPy, constructed from multi-walled carbon nanotubes (MWCNTs) and polypyrrole (PPy) doped with dodecyl benzene sulfonate (DBS - ), as the growing substrate to mitigate the aggregation of MoS 2 nanoflakes. In this design, CNT/PPy ameliorates the wettability of the composite, provides convenient movement pathways, a fast charge transport rate, and facilitates ions diffusion process. Moreover, reinforced dispersibility and enlarged interlayer spacing of MoS 2 nanoflakes supply sufficient embedded sites for ion uptake and rapid transfer. Meanwhile, tight chemical coupling of Mo-N-C bonds can maintain the structural integrity of the composite electrode. Particularly, the symmetrical electrode configuration was established to address the kinetical unbalance of HCDI system. Consequently, the CNT/PPy/MoS 2 displays a large specific capacitance of 160.83 F g −1 at 5 mV s −1 , which is nearly 4.33 times that of MoS 2 (37.17 F g −1 ). The optimized CNT/PPy/MoS 2 cell achieves a maximum desalination capacity of 24.8 mg g −1 , ultra-high deionization rate of 5.24 mg g −1 min −1 , and superior capacity retention rate of 92.7% over 25 cycles. In addition, Na + ions were captured by the joint action of cation-exchange of DBS - -doped PPy, electrostatic adsorption of CNTs, and intercalation reaction of MoS 2 . The proposed composite structural design and electrode configuration should be a potential avenue to realize highly efficient deionization.
研究领域:
材料科学
·
环境科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Qianfeng Li,Jian Sun,Xiang Li,Changling Yan,Gongke Wang
Silver ion (Ag + ) is a significant metal pollutant known for its potential toxicity to aquatic life and human health. Long-term exposure to toxic heavy metals will do great harm to humans and animals. Therefore, it is urgent to develop an efficient method for detecting Ag + . Herein, we have developed a simple, sensitive, highly selective and cost-effective fluorescence “off-on” mode nanosensor based on environmentally friendly and biocompatible materials for sensitive detection of Ag + in aqueous environments. In this sensing strategy, Ag + can specifically interact with the cytosine-cytosine (C-C) mismatch in single-stranded DNA, where Ag + induces the folding of single-stranded DNA to form hairpin structures and stable metal-mediated cytosine-Ag + -cytosine (C-Ag + -C) base pairs via coordinate bonds. Massive changes to the molecular volume and fluorescence signal are brought about by the development of the C-Ag + -C complex. To reach our objective, CdTe quantum dots (CdTe QDs) with low toxicity and strong signal were prepared as fluorophores for detecting Ag + target. Using the inner filter effect (IFE) between hydrophilic CdTe QDs and MoS 2 nanosheets to achieve the fluorescence quenching of the CdTe QDs, and the subsequent fluorescence turn-on process is due to the formation of C-Ag + -C complex, which makes its probe fluorophore far away from the surface of MoS 2 nanosheets, thus realizing fluorescence “off-on” sensing strategy. The proposed nanosensor can distinguish Ag + from other interfering ions with high sensitivity and selectivity. The nanosensor proposed here possesses a quick response time of 8 min and an ultra-low detection limit of 1.1 nM.
研究领域:
环境科学
·
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2025
·
IF 9.5
Qiang Fu,Zhiling Huang,Zheming Ni,Shengjie Xia
Effectively enhancing nitrogen activation and inhibiting water splitting reactions are key factors in photocatalytic nitrogen reduction. This work integrated defect engineering and metal doping, doping transition metals Sc, Cu, and V into molybdenum sulfide (MoS2) containing sulfur vacancies (VS) to prepare TM@VS−MoS2(TM=Sc, Cu, V), applied for photocatalytic nitrogen reduction (pNRR). High angle annular dark field scanning transmission electron microscopy (HAADF-STEM) confirms the existence of S vacancies. The pNRR activity of Sc@VS−MoS2, Cu@VS−MoS2 and V@VS−MoS2 is 124.26 μmol g−1 h−1, 101.32 μmol g−1 h−1, 88.64 μmol g−1 h−1, respectively, which is much higher than that of MoS2, VS−MoS2, and TM@MoS2. This fully demonstrates that the comprehensive use of S vacancies and metal doping can significantly enhance the photocatalytic performance of MoS2 (with a maximum activity improvement of nearly 5 times). DFT calculations show that transition metal doping can further promote the activation of N2 and inhibit the production of H2 from water decomposition for vacancy MoS2. The effect of the above promotion and inhibition is consistent with the order of activity and photoelectronic properties: Sc@VS−MoS2>Cu@VS−MoS2>V@VS−MoS2. In situ infrared spectroscopy revealed the generation of −N2Hy (1≤y≤4) active species during the pNRR process, which is consistent with the most potential pathway (enzymatic mechanism) calculated by DFT.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Yating Xie,Ligang Chen,Qiu Jin,Jimmy Yun,Xin Liang
Co–Mo–S based catalysts have promising applications in both hydrogen evolution reaction (HER) and hydrodesulfurization (HDS). Herein, MoS 2 –Co 3 S 4 hollow polyhedrons have been successfully synthesized by the vulcanization of Mo doped ZIF-67. MoS 2 –Co 3 S 4 hollow polyhedrons show the superior HER and HDS catalytic activities to pure MoS 2 , Co 3 S 4 and MoS 2 –Co 3 S 4 nanoparticles prepared by the traditional coprecipitation methods, owing to the both morphology effect and synergistic effect between Co 3 S 4 and MoS 2 . DFT calculation studied the activation energies needed by MoS 2 and Co–Mo–S for HER and HDS, respectively. The required activation energies for C–S bond fracture and H 2 generation on Co–Mo–S structure are both obviously lower than that of MoS 2 structure. Our work reported a new method to synthesize Co–Mo–S catalysts with large surface area and numerous active sites, and further experimentally and theoretically proved Co–Mo–S structure had better catalytic activities for both HER and HDS.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Xiangyang Zhu,Wenjie Wang,Huifang Xing,Qinling Bi,Li Wang,Meng Rong,Shan Ni,Menglei Yuan,Liangrong Yang,Huizhou Liu
Magnetic nanocomposites provide manifold perspectives for sustainable development. However, the cumbersome operation process and energy consumption after treatment limit its application in the practical industry. Herein, we present a simple and universal strategy to synthesize Fe 3 O 4 @PDA@shell nanoparticles via in-situ homogeneous hydrolysis reaction growth different nanomaterials on the PDA modified Fe 3 O 4 nanospheres , which can avoid multistep repetitive washing, redispersing, and drying. As an example, we introduced the synthesis process of Fe 3 O 4 @PDA@MoS 2 catalyst used for heavy oil hydrocracking in detail. The synthesis processes were significantly simplified and the dispersity and stability of the nanosized MoS 2 were improved due to the copious functional groups and strong adhesion properties of polydopamine. The as-prepared Fe 3 O 4 @PDA@MoS 2 nanoparticle catalysts showed high activity and excellent stability. The viscosity of residue was decreased by 99.8% and the recovery of the catalyst reached 90% under harsh conditions (405 ℃ at 13 MPa H 2 ). We also demonstrate the versatility of this strategy for other shell materials, such as WS 2 , VS 2 , Pd, and Rh components, which is promising for designing multifunctional core−shell−shell materials for various applications.
研究领域:
化学工程
·
纳米材料科学
·
能源催化
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Kequn Sun,Yinghui Dong,Lulu Yao,Mausumi Mahapatra,Yufu Xu
In this investigation, the surface tribological behavior of YG8/TC4 contacts under microgel lubrication was explored, utilizing thermal- and pH-sensitive PNIPAM-co-PAA-(IF-MoS 2 /GO) composite microgels as lubricant additives. Through the application of a ball-on-disk reciprocating tribometer, the study demonstrated the outstanding lubrication capabilities of the composite microgels. The lubrication process involving PNIPAM-co-PAA-(IF-MoS 2 /GO) composite microgels initiated a tribo-chemical reaction, leading to the generation of a larger quantity of TiS 2 with exceptional lubricating properties on the friction surface compared to alternative lubrication conditions. The effective isolation of the friction pair by PNIPAM-co-PAA composite microgels contributed to the reduction in tribo-oxidation of the sliding surfaces , while the presence of IF-MoS 2 facilitated the formation of TiS 2 . Furthermore, the facile sliding property of GO nanosheets played a crucial role in achieving overall excellent lubrication performance. The synergistic effects arising from the components in PNIPAM-co-PAA-(IF-MoS 2 /GO) composite microgels introduce a novel and effective strategy for controlling the friction and wear of YG8/TC4 contacts.
研究领域:
材料科学
·
表面工程学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）