CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Dongyao Lin,Yunlong Zhou,Xiaoyuan Ye,Mingyuan Zhu
The construction of sandwich structured binary composite can enlarge its specific surface and strengthen the contact of binary interface. This can enhance H 2 generation efficiency of the photocatalyst . In this study, two-step strategy for the preparation of novel sandwich-structured g-C 3 N 4 /WS 2 is proposed. Step one is hydrothermal process producing the layered WO 3 , which is used as the precursor for monolayer WS 2 . While step two involves one-pot calcination process that generates sandwich structured g-C 3 N 4 /WS 2 . X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), inductively coupled plasma optical emission spectrometry (ICP-OES), Brunauer Emmett Teller method (BET), and transmission electron microscopy (TEM) are employed to characterize the composition, structure and morphology of g-C 3 N 4 /WS 2 . Photocatalytic H 2 generation tests show that the optimal H 2 generation rate of g-C 3 N 4 /WS 2 is 599.7 μmol h -1 g -1 (20 mg of photocatalyst), which is about 25 times higher than that of bare g-C 3 N 4 . Moreover, UV–vis diffuse reflectance spectroscopy (UV–vis DRS), photoluminescence (PL) and electrochemical tests are employ to establish possible mechanism of photocatalytic H 2 evolution in sandwich-structured g-C 3 N 4 /WS 2 .
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 47
·期 30
·10046-10056
·
IF 4.099
Xiang Li,Mengyuan Su,Guifen Zhu,Kaige Zhang,Xia Zhang,Jing Fan
In this study, a novel few-layer WS2/Bi2MoO6 heterojunction with greatly enhanced visible light photocatalytic performance was synthesized via a facile hydrothermal method. The results indicated that Bi2MoO6 nanosheets were directly grown on the surface of few-layer WS2 and form plate-on-plate heterojunctions. The synthesized nanocomposites exhibited excellent photocatalytic activity under visible-light irradiation. The optimal composite with 5 wt% WS2 showed the highest photocatalytic activity, whose degradation efficiencies and TOC removal were 99.5% and 91.7% for rhodamine B (RhB), 98.9% and 89.8% for ciprofloxacin (CIP), 76.0% and 67.8% for methylene blue (MB), and 69.3% and 58.6% for methimazole (MMI), respectively. Their excellent photocatalytic performance was predominantly ascribed to the construction of a plate-on-plate heterojunction structure between WS2 and Bi2MoO6, which could promote charge separation efficiency and enhance light harvesting efficiency. The present work provides a new understanding for extending the application of transition-metal dichalcogenides in the field of photocatalysis.
研究领域:
材料科学
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环境科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2013
·Vol. 13
·期 3
·1983-1987
·
IF 1.149
Zhu Yajun,Zhang Xuebin,Ji Yi,Feng Yi,Zhang Jingcheng
This paper describes a procedure of synthesizing long WS2 nanofibers. WO3 nanofibers were prepared as precursors by electrospinning of ammonium meta-tungstate (AMT), polyvinyl alcohol (PVA) and alcohol solution followed by calcination at 550 °C in air. WS2
nanofibers were obtained by sulfurization of the WO3 nanofibres at 800 °C in an argon atmosphere, with sulfur powder acting as sulfuration reducer. The nanofibres were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron
microscopy (SEM), energy dispersive X-ray (EDX), and transmission electron microscopy (TEM). The results show that the final products are pure WS2 nanofibres, which have high aspect ratio. The WS2 nanofibers with rough surface were formed of nanoparticles, while some
nanoflakes appeared on the surface of WS2 nanofibres. The diameters of the WS2 nanofibers were between 200 and 300 nm, which is similar to WO3 nanofibers. In addition, the WS2 nanofibers were polycrystalline.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xuemu Li,Jianxin Deng,Yang Lu,Liangliang Zhang,Jie Sun,Fengfang Wu
This study demonstrated the dry friction and wear behavior of sol-gel ZrO 2 /WS 2 coatings with biomimetic shark-skin textured surfaces. The effect of added WS 2 on the microstructure and mechanical properties of ZrO 2 coatings was examined and the dry sliding wear and friction behaviors against commercial AISI1045 steel balls were investigated. After adding WS 2 , the micro hardness of ZrO 2 coating decreased by ~39% (from 23.7 GPa to 14.5 GPa), and the average steady state friction coefficient was decreased from ~0.43 to ~ 0.2. When the ZrO 2 /WS 2 coating surface was textured biomimetic shark skin, nearly 66% decrease of the average steady state friction coefficient and 82% decrease of ball wear rate were obtained as compared with the pure ZrO 2 coatings. The possible frictional mechanism of the biomimetic shark-skin structures was discussed.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 6
·065304
·
IF 1.449
Boping Wang,Qihang Gao,Bo Zhang,Xiaobing Yan
Structural color, an important functional component of many organisms, is widespread in the natural world. The value of WS2 is being gradually recognized. Inspired by these phenomena, an intelligent structural color material, with a heterogeneous striped pattern that is based on WS2 nanosheets, is presented here. When irradiated with light, the material is endowed with light-controlled, reversible, bending behavior with self-reporting color indication. Furthermore, the material has a high stability index and a small maximum bending angle. Most interestingly, because of the WS2 nanosheets' strong photoluminescence ability, the structural colors' intensity is increased. This material can be used as light-triggered, dynamic barcode labels for anti-counterfeiting different products. These features of the bioinspired structural color stripe pattern of the material indicate its potential for constructing binary information storage devices, intelligent sensors, and so on.
研究领域:
材料科学
·
光学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2019
·
IF 0.486
Deqing Zhang,Tingting Liu,Shuang Liang,Jixing Chai,Xiuying Yang,Junye Cheng,Hao Wang,Maosheng Cao
In this study, we report two-dimensional WS2 nanosheets successfully synthesized by simple hydrothermal method. The obtained WS2 nanosheets are very promising as electromagnetic wave absorbers. The phase composition, microstructure, electromagnetic properties and microwave absorption properties of the prepared WS2 nanosheets were characterized by XRD, SEM, TEM, XPS and vector network analyzers. Our results show that the real and imaginary parts of permittivity of WS2 prepared at 210 °C are higher than those of other samples, with maximum interfacial polarization and dielectric loss, a wide effective absorption band with a thinner thickness is obtained in the frequency range of 5.5–18 GHz. The effective absorption bandwidth can reach 12.5 GHz, the highest reflection loss of the sample wax containing 40% WS2 is –15.6 dB at a thickness of 5.5 mm, and the absolute value of RL is greater than 10 dB in the range of 2.0–5.5 mm. The results show that the prepared WS2 nanosheets have the advantages of wide bandwidth, strong absorption and light weight, and have potential application prospects in the application and development of microwave absorbing materials in the future.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Boxiang Gao,Yan Yan,Shuai Zhang,Zenghui Wu,You Meng,Yuxuan Zhang,Weijun Wang,Yi Shen,Siliang Hu,Bowen Li,He Shao,Pengshan Xie,SenPo Yip,Johnny C. Ho
Van der Waals (vdWs) p–n junctions assembled from 2D materials offer enhanced flexibility for creating versatile electronic and optoelectronic devices, attracting significant interest. However, the lack of reliable methods to produce high-quality p-type 2D semiconductors, especially patterned p-type channels, remains a major challenge for progress in the field. Here, a precise substitutional doping strategy for 2D semiconductors is presented, enabling the production of millimeter-scale WS 2 single-crystal thin films with tailored p-type and n-type properties. This advancement supports the fabrication of high-performance WS 2 -based p-type and n-type field-effect transistor (FET) miniaturized arrays with near-ohmic contact. Building on this progress, a WS 2 van der Waals homojunction p-n array demonstrating distinct anti-ambipolar behavior and excellent rectification characteristics is developed. In self-powered photodetection mode, leveraging the strong coupling of the vdWs homojunction interface, the device achieves an exceptional photovoltaic effect with a high specific detectivity of 3.4 × 10 10 Jones and a fast response time of 400 µs. The development of WS 2 p-n homojunction arrays presents immense potential for advancing next-generation logic electronics and optoelectronic devices, opening new avenues for large-scale industrial applications.
研究领域:
材料科学
·
电子工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2018
·Vol. 7
·期 3
·1800476
·
IF 3.175
Zimin Jiang,Tingting Xu,Shuge Dai,Congcong Yan,Caiyun Ma,Xinchang Wang,Junmin Xu,Sen Zhang,Ye Wang
3D Ni(OH) 2 /tungsten disulfide (WS 2 ) nanofibers composed of ultrathin nanoflakes are synthesized by electrospinning followed by a hydrothermal process, which have a large specific surface of 64.56 m 2 g −1 . When tested in a three-electrode configuration, the WS 2 /Ni(OH) 2 nanofiber-based electrode exhibits a high specific capacity of 354 C g −1 at a current density of 1 A g −1 . The hybrid storage device, in which WS 2 /Ni(OH) 2 nanofibers and graphene are used as the positive and negative electrodes, respectively, exhibits a high energy density of 34 Wh kg −1 at a power density of 940 W kg −1 and a high capacity retention of 83% after 4000 cycles at 4 A g −1 . The as-synthesized 3D Ni(OH) 2 /WS 2 nanofibers provide a way for the WS 2 nanostructure to optimize its viability and potential in constructing a high-performance energy storage device.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2016
·Vol. 9
·期 3
·857-865
·
IF 8.893
Zhou Liyan,Yan Shancheng,Pan Lijia,Wang Xinran,Wang Yuqiao,Shi Yi
Two-dimensional transition-metal dichalcogenides (WS 2 and SnS 2 ) have recently joined the family of energy storage materials (for lithium-ion batteries and supercapacitors) as a result of their favorable ion intercalation. So far, challenges in the synthesis of phase-pure WS 2 , restacking between WS 2 nanosheets, low electronic conductivity, and the brittle nature of WS 2 , severely limit its use Li-ion battery application. Herein, we develop a facile low temperature solution sulfuration process to improve battery performance dramatically. The sulfuration process is demonstrated to be effective in converting WO 3 impurities to WS 2 , and in repairing the sulfur vacancies, to improve cyclability and rate capability. Lithium-ion battery measurements demonstrate that the stable capacity of the WS 2 anode could be enhanced by 48.4% via sulfuration reprocessing, i.e., from 381.7 to 566.8 mAh/g at a relatively high current density of 0.8 A/g after 50 cycles. We further show that the sulfuration process can be readily extended to other dichalcogenides, and may provide a class of versatile electrode materials for lithium-ion batteries with improved electrochemical characteristics.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Chuanxu Hou,Junye Cheng,Huibin Zhang,Ziheng Lu,Xiuying Yang,Guangping Zheng,Deqing Zhang,Maosheng Cao
With the continuous advances in detection and early-warning technologies, stealth technologies have widely integrated in modern combat systems and armament research. The development of high-performance electromagnetic wave absorbing materials is important for electromagnetic stealth and shielding applications. Herein, biomass-derived carbon (BDC) from glucose is coated on the surface of folded and stacked WS 2 nanosheets, forming WS 2 @BDC via a simple hydrothermal method and subsequent annealing carbonization. The amount of the BDC coating on the WS 2 nanosheets is effectively controlled by the glucose solution concentration, and the electromagnetic wave (EMW) absorption performance in the low-frequency bands can be adjusted by the regulation of annealing temperature. The effective absorption band of WS 2 @BDC is shifted to a lower frequency region and the absorption performance is substantially enhanced, compared to those of pure WS 2 nanosheets. The minimum reflection loss of WS 2 @BDC corresponding to 14 mL of glucose and a carbonization temperature of 800 °C can reach up to −51.40 dB at 5.52 GHz. The study provides a novel and facile method for improving the EMW absorption performance of WS 2 in the low-frequency bands.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Bijiang Geng,Hua Qin,Wenwen Shen,Ping Li,Fuling Fang,Xiaokai Li,Dengyu Pan,Longxiang Shen
Osteosarcoma as an aggressive malignant neoplasm is commonly treated by surgical resection, chemotherapy, and radiotherapy, but surgery induces bone defects and chemo/radiotherapy causes severe systemic toxicity. We have designed a novel low-toxic bifunctional 0D/2D heterojunction (HJ) that can be used to generate effective photothermal effects in the second NIR window (NIR-II, 1000–1350 nm) for simultaneous osteosarcoma treatment and bone regeneration. To construct this 0D/2D nanostructure, biocompatible, positively charged NIR-II-responsive carbon dots (CDs) were synthesized by an ultrafast microwave-assisted hydrothermal method, followed by electrostatically driven assembly on both sides of negatively charged WS 2 nanosheets. We found that the HJs exhibited enhanced NIR-II absorption and photothermal conversion efficiency. Due to the deep-tissue penetration ability of 1064 nm laser, complete osteosarcoma ablation was realized at a low power density even when being covered by a 10-mm-thick additional tissue. Furthermore, osteogenic differentiation was remarkably enhanced by mild photothermal effects of CD/WS 2 HJs, which significantly up-regulated bone-related gene expressions, particularly, heat shock protein expression. Designed CD/WS 2 HJs can be used in osteosarcoma treatment and bone-tissue engineering.
研究领域:
生物医学工程
·
纳米技术
·
癌症治疗
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2018
·Vol. 20
·期 16
·2324-2330
·
IF 3.304
Haiting Yan,Jianhui Li,Daomeng Liu,Xunan Jing,Daquan Wang,Lingjie Meng
Thin-layered WS2 nanostructures have attracted great attention owing to their superior structures and properties when compared to MoS2, including larger layer-spacing, higher energy gap and better photothermal and lubrication properties. However, it is still challenging to prepare high-quality WS2 nanosheets and assemble them into large quantities. In this work, we report a facile and efficient microwave-assisted solvothermal method for the synthesis of WS2 nanostructures in N-methyl-2-pyrrolidone (NMP) using cheap tungsten hexachloride (WCl6) and elemental sulfur (S) as starting materials. The formation of WS2 nanosheets and their controlled assembly into different morphologies (such as nanocones and nanoworms) were studied by adjusting the reactant concentration and reaction temperature. This method has also been successfully applied for preparation of other transition-metal dichalcogenides such as MoS2. The resulting WS2 and MoS2 nanomaterials were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The photothermal properties of WS2 nanostructures have been investigated and it was found that the WS2 nanosheets have the best photothermal efficiency and stable photothermal capacity, exhibiting great potential for photothermal therapy and other fields.
研究领域:
材料科学
·
纳米技术
·
光热治疗
✓ 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）