ACS Applied Materials & Interfaces
·
2018
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IF 8.097
Danyun Xu,Pengtao Xu,Yuanzhi Zhu,Wenchao Peng,Yang Li,Guoliang Zhang,Fengbao Zhang,Thomas E. Mallouk,Xiaobin Fan
Monolayer WS2 has interesting properties as a direct bandgap semiconductor, photocatalyst, and electrocatalyst, but it is still a significant challenge to prepare this material in colloidal form by liquid-phase exfoliation (LPE). Here, we report the preparation of 1–2 layer semiconducting WS2 nanosheets in a yield of 18–22 wt % by a modified LPE method that involves preintercalation with substoichometric quantities of n-butyllithium. The exfoliated WS2 nanosheeets are n-type, have a bandgap of ∼1.78 eV, and act as a cocatalyst with CdS nanorods in photocatalytic hydrogen evolution using lactate as a sacrificial electron donor. Up to a 26-fold increase in H2 evolution rate was observed with WS2/CdS hybrids compared with their pure CdS counterpart, and an absorbed photon quantum yield (AQE) of >60% was measured with the optimized photocatalyst.
研究领域:
材料科学
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纳米技术
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光催化
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能量转换
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半导体材料
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DOI
高影响因子
Chinese Physics B
·
2021
·Vol. 30
·期 12
·126201
·
IF 1.494
Jin-Zi Ding,Wei Ren,Ai-Ling Feng,Yao Wang,Hao-Sen Qiao,Yu-Xin Jia,Shuang-Xiong Ma,Bo-Yu Zhang
Flower-like tungsten disulfide (WS2) with a diameter of 5–10 μm is prepared by chemical vapor deposition (CVD). Scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), Raman spectroscopy, and ultraviolet-visible (UV-vis) spectroscopy are used to characterize its morphological and optical properties, and its growth mechanism is discussed. The key factors for the formation of flower-like WS2 are determined. Firstly, the cooling process causes the generation of nucleation dislocations, and then the “leaf” growth of flower-like WS2 is achieved by increasing the temperature.
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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DOI
高影响因子
Surfaces and Interfaces
·
2026
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IF 6
Yufei Yang,Leqi Chou,Zhuocheng Gan,Zhiqi Wen,Wenhao Zhang,Bo Wei,Chunyou Mao,Xiangbin Zeng
Tungsten disulfide (WS 2 ), a representative transition metal dichalcogenide (TMDC), has emerged as a pivotal material for logic, optoelectronic, and flexible electronics owing to its exceptional properties. However, cumbersome synthesis protocols and multi-step fabrication processes severely hinder its practical implementations. Herein, we report a direct, rapid, and scalable approach for synthesizing large-area WS 2 thin films utilizing an excimer laser (λ= 248 nm). By employing a machine learning (ML) framework to optimize the laser processing parameters, the controllable synthesis of WS 2 is achieved with negligible thermal accumulation. Furthermore, we successfully fabricated WS 2 -based field-effect transistors (FETs) and flexible strain sensors. Notably, the FETs exhibit a remarkable I on /I off current ratio of 10 6 and an electron mobility of 6.72 cm 2 /V∙s. This methodology not only facilitates the large-area synthesis and device integration of WS 2 but also presents a versatile pathway for developing micro/nano-devices based on a broad spectrum of TMDCs and other functional materials. Download: Download high-res image (221KB) Download: Download full-size image
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DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 12
·1835
·
IF 5.3
Min Zhang,Jinzhu Zhang
In this paper, the heterostructure of MoS2/WS2was prepared by a hydrothermal method; the n-n heterostructure was demonstrated using TEM combined with Mott-Schottky analysis. The valence and conduction band positions were further identified by the XPS valence band spectra. The NH3-sensing properties were assessed at room temperature by changing the mass ratio of the MoS2and WS2components. The 50 wt%-MoS2/WS2sample exhibited the best performance, with a peak response of 23643% to NH3at a concentration of 500 ppm, a minimum detection limit of 20 ppm, and a fast recovery time of 2.6 s. Furthermore, the composites-based sensors demonstrated an excellent humidity immune property with less than one order of magnitude in the humidity range of 11–95% RH, revealing the practical application value of these sensors. These results suggest that the MoS2/WS2heterojunction is an intriguing candidate for fabricating NH3sensors.Keywords:MoS2/WS2;anti-humidity;ammonia sensing properties;heterojunction
研究领域:
材料科学
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传感器技术
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产品关联
DOI
PubMed
高影响因子
OPTICS EXPRESS
·
2024
·Vol. 32
·期 15
·26342-26350
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IF 3.2
Hao Liu,Liping Chen,Tianhong Chen,Kaili Wang,Zhihan Jin,Chee Leong Tan,Yi Shi,Yi Shi,Shancheng Yan,Shancheng Yan
Two-dimensional metal-sulfur compounds have attracted much attention due to their novel physical properties, such as layered structure, ultrathin physical dimensions, and continuously tunable bandgap. The vertical stacking of different 2D semiconductors enables the heterojunction to retain the excellent properties of its constituent materials and has physical properties such as interlayer energy transfer and interlayer carrier transfer. In this paper, we utilize the carrier interlayer transfer properties of p-n heterojunctions and form heterojunctions using p-type Te and PdSe2 prepared with n-type monolayer WS2 using the microzone transfer technique. We found that the PL spectrum of monolayer WS2 is purer after heterojunction formation. The photoluminescence peaks representing exciton recombination are sharper, while the peaks represented by trions almost disappear. These phenomena indicate that we can utilize p-n junctions to capture the PL spectra of excitons in WS2, which is important for the further study of the optical properties of 2D metal-sulfur compounds.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hexuan Li,Dongdong Li,Yilin Li,Haoran Liu,Junzhi Li,Wei Han
The reaction kinetics of lithium-sulfur (Li-S) battery mainly depends on the capture and catalytic conversion efficiency of lithium polysulfide (LiPSs). The unique electron configuration of the 5d metal and the high electrical conductivity of MXene can enhance the interaction between the catalyst and LiPSs. However, the challenge of enhancing the adsorption of LiPSs by regulating the electronic structure of the catalyst with 5d metal and MXene remains unresolved and obscure. In this work, we have developed molybdenum disulfide (MoS 2 )-tungsten disulfide (WS 2 ) @MXene (MoS 2 -WS 2 @MX) heterostructure catalysts for separator coatings in Li-S batteries by introducing W and MXene for the first time. Theoretical calculations demonstrate that the 5 d metallic and conductive MXene coupling effectively modulate the orbital hybridization degree between the catalyst and LiPSs, thereby reducing the energy barrier for LiPSs conversion. Electrochemical test and in situ tests verify the effectiveness of the strategy on the adsorption and conversion of LiPSs. Consequently, the MoS 2 -WS 2 @MX based batteries exhibit high initial reversible capacity of 950.3 mAh g −1 and low capacity decay of 0.066 % per cycle over 500 cycles at 2 C, which is superior to most reported catalysts. This study provides a dual regulatory strategy for enhancing catalytic activity, offering valuable insights for the advancement of high-performance Li-S batteries.
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
VACUUM
·
2022
·
IF 4.11
Jiashuo Yan,Shuang Lian,Zhigang Cao,Yadan Du,Ping Wu,Huijuan Sun,Yukai An
In this work, tungsten disulfide (WS 2 ) nanosheets with good morphology are prepared by improved chemical vapor deposition (CVD) using a mixture of transition metal oxides and chalcogenide as precursors. By optimizing the growth conditions, the high-quality WS 2 nanosheets with different morphologies, including large triangular, hexagonal, small triangular, terraced and spiral structures are obtained as the growth temperature of 850 °C, Ar gas flow rate of 50 sccm and holding time for 15 min. The detailed structural analyses by XRD , XPS , TEM and Raman measurements suggest that that the deposited WS 2 nanosheets exhibit the 2H phase structure with high crystallization quality and uniform distribution of W and S elements. The formation of large triangular, hexagonal, and small triangular structures is related to the growth rate of different crystal planes of S atoms or W atoms. In addition, the formation of terraced and spiral stacking structures originates from the difference of supersaturation of precursors, which can be explained by the layer-by-layer stacking (LBL) growth and the spiral-dislocation-driven (SDD) mechanisms, respectively.
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DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Zeyu Wei,Yunlong Zhang,Mingrun Li,Chaozhu Shu,Dehui Deng
Sodium-ion batteries (SIBs), as the promising energy storage systems alternative to lithium-ion batteries (LIBs), are given increasing expectations and highly valued owing to the abundant reserves and low cost of sodium-containing minerals. However, further applications are still limited by the lack of anode material with high capacity and long cycle life. Herein, highly permeable foam-like tungsten disulfide/reduced graphene oxide composites with 3D interconnected hierarchical porous structure (3DHP WS 2 /RGO) are designed and studied as anode materials in SIBs. Remarkably improved battery performance is obtained, including high reversible capacity (419 mA h g −1 at 100 mA g −1 ), excellent cycling stability (1000 cycles) and superior rate capability (360 mA h g −1 at 2 A g −1 ). Electrochemical characterizations reveal that the high pseudocapacitive behavior dominates the fast ions/charge reaction kinetics, and the reversible conversion between Na 2 S generated in the first discharge process and S as evidenced by various advanced characterization techniques dominates sodium storage. The exceptional performance exhibited by 3DHP WS 2 /RGO composite sheds new light on the development of two-dimensional transition metal dichalcogenides-based materials for next-generation energy storage systems.
研究领域:
材料科学
·
电化学
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2019
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IF 3.019
Shengnan Guo,Hao Guo,Xueying Wang,Yongping Zhu,Ming Yang,Qing Zhang,Ying Chu,Jianyong Wang
Cathode materials that have better thermal stability, larger specific capacity and higher conductivity can efficiently improve the electrochemical performance of the batteries. In this work, we synthesized tungsten disulfide (WS 2 ) nanosheet and investigated its applicability as cathode material for thermal battery. The WS 2 is thermally stable up to 1200 °C. The open-circuit voltage is 1.43 V versus Li-B anode. At a current density of 150 mA cm −2 , the Li-B/WS 2 single cell exhibits a specific capacity of 334.7 mA h g −1 with a cut-off voltage of 1.0 V. The end discharge products are proved to be W and Li 2 S. This work provides a beginning for further applying WS 2 as a promising cathode material for long-life thermal batteries.
研究领域:
材料科学
·
电化学
·
储能
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DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 4
·959-966
·
IF 8.183
Wang Lin,Yue Qiuyan,Pei Chengjie,Fan Huacheng,Dai Jie,Huang Xiao,Li Hai,Huang Wei
Recently, transition metal dichalcogenides (TMDCs) nanoscrolls have exhibited unique electronic and optical properties due to their spiral tubular structures, which are formed by rolling up monolayer TMDCs nanosheets. Inspired by the excellent physical and chemical properties of TMDCs van der Waals heterostructures (vdWHs), it is highly desirable to scroll TMDCs vdWHs for potential optoelectronic applications. In this work, WS 2 /MoS 2 vdWHs nanoscrolls were massively prepared by dropping aqueous alkaline droplet on chemical vapor deposition (CVD)-grown bilayer WS 2 /MoS 2 vdWHs, which were formed by growing monolayer WS 2 islands on top of monolayer MoS 2 nanosheets simultaneously. The optical microscopy (OM), atomic force microscopy (AFM), ultralow frequency (ULF) Raman spectroscopy and transmission electron microscopy (TEM) were utilized to characterize the WS 2 /MoS 2 vdWHs nanoscrolls. As-obtained WS 2 /MoS 2 vdWHs nanoscrolls exhibited new ULF breathing mode as well as shear mode peaks due to the strong interlayer interaction. Notably, the photosensitivities of WS 2 /MoS 2 vdWHs nanoscrolls-based devices were about ten times higher than those of WS 2 /MoS 2 vdWHs-based devices under blue, green and red lasers, respectively, which could be attributed to the ultrafast charge transfer at alternative WS 2 /MoS 2 and MoS 2 /WS 2 multi-interfaces in scrolled structure. Our work suggested that TMDCs vdWHs scrolls could be promising candidates for optoelectronic applications.
研究领域:
材料科学
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光学
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2017
·
IF 2.686
A. Bayat,E. Saievar-Iranizad
Blue photoluminescent WS 2 quantum dots (QDs) were synthesized using a simple top-down method from natural raw mineral tungsten disulfide via tip ultrasonication followed by centrifugation in a water-ethanol (0.7/0.3 ratio) as eco-friendly solvent. Cavitation process at a high power (300 W) led to the breaking of bulk WS 2 flakes to its quantum dots. The as synthesized WS 2 QDs showed blue photoluminescence upon UV excitation. The synthesized WS 2 QDs were analysed by UV–vis and photoluminescence spectrophotometry , transmission electron microscopy , atomic force microscopy and X-ray diffraction. According to the transmission electron microscopy images, the size of WS 2 QDs was obtained as 5 nm in average.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
Catalysts
·
2017
·Vol. 7
·期 1
·18
·
IF 3.082
Liyan Zhou,Shancheng Yan,Han Wu,Haizeng Song,Yi Shi
Two-dimensional transition metal dichalcogenides, such as tungsten disulfide (WS2), have been actively studied as suitable candidates for photocatalysts due to their unique structural and electronic properties. The presence of active sites at the edges and the higher specific surface area of these materials are crucial to the photocatalytic activity of the hydrogen evolution reaction. Here, WS2quantum dots (QDs) have been successfully synthesized by using a combination of grinding and sonication techniques. The morphology of the QDs was observed, using transmission electron microscopy and an atomic force microscope, to have uniform sizes of less than 5 nm. Photoelectrochemical (PEC) measurements show that the current density of WS2QDs under illumination is almost two times higher than that of pristine WS2. Furthermore, these high-quality WS2QDs may have various applications in optoelectronics, solar cells, and biomedicine.Keywords:tungsten disulfide;quantum dots;sonication;photocatalysis
研究领域:
材料科学
·
能源科学
·
光电化学
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）