JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
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2017
·Vol. 55
·期 13
·997-1004
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IF 2.838
Tongzhou Wang,Congcong Liu,Xiaodong Wang,Xia Li,Fengxing Jiang,Changcun Li,Jian Hou,Jingkun Xu
Two-dimensional (2D) WS 2 nanosheets (NSs) as a promising thermoelectric (TE) material have gained great concern recently. The low electrical conductivity significantly limits its further development. Herein, we reported an effective method to enhance the TE performance of WS 2 NSs by combining poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS). The restacked WS 2 NSs thin film with 1T phase structure obtained by a common chemical lithium intercalation show a high Seebeck coefficient of 98 μV K −1 and a poor electrical conductivity of 12.5 S cm −1 . The introduction of PEDOT:PSS with different contents obviously improve the electrical conductivity of WS 2 NSs thin films. Although a declining Seebeck coefficient was observed, an optimized TE power factor of 45.2 μW m −1 k −1 was achieved for WS 2 /PEDOT:PSS composite thin film. Moreover, the as-prepared WS 2 /PEDOT:PSS thin film can be easily peeled off and transferred to other substrate leading to a more promising application. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017 , 55 , 997–1004
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Jiapeng Xu,Chaoqiang Liu,Lijuan Fu,Qingyu Liu,Seeram Ramakrishna,Wei Tang
In this work, CuO nanosheets are synthesized by one-step hydrothermal method and CuO/WS 2 heterostructures are fabricated by introducing CuO doping into WS 2 , the preparation method was employed to enhance the performance of the gas sensor. The CuO/WS 2 heterostructure nanocomposite sensor, doped with 5 % CuO, exhibited a pronounced enhancement in its response to 30 ppm of ammonia gas at ambient temperature, increasing the response value from 3.8 observed in pure WS 2 -based sensors to 4.7. Specifically, the response time of the CuO/WS 2 heterostructure-based gas sensor decreased to 180 s, whereas the WS 2 -based sensor required 350 s for NH 3 detection at room temperature. Furthermore, the CuO/WS 2 sensor demonstrated outstanding selectivity for ammonia, maintaining stability over a 90-day test with a response fluctuation of less than 5 %. The heterojunction formed by CuO and WS 2 showed superior sensitivity to NH 3 compared to pristine WS 2 , owing to a notable enhancement in the surface catalytic effect. It also displayed sensitivity to humidity, with a response value of 6.25 at a 71 % relative humidity. At last, the gas sensing and enhanced gas sensing performance mechanisms of the composites for NH 3 were elucidated. This remarkable multi-functional performance offers valuable insights for the advancement of room temperature gas sensors with diverse sensing functionalities.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2015
·
IF 5.337
M. Zirak,M. Zhao,O. Moradlou,M. Samadi,N. Sarikhani,Q. Wang,H.-L. Zhang,A.Z. Moshfegh
We report the well-controlled preparation of WS 2 nanosheets–CdS nanoparticle heterojunction for photoelectrochemical (PEC) water splitting application. The WS 2 nanosheets with an average thickness of ~5 nm and lateral dimensions of ~200 nm were synthesized via liquid phase exfoliation of bulk WS 2 in water/ethanol solution, followed by deposition onto ITO substrate via electrophoretic method. CdS nanoparticles were grown via facile successive ion layer absorption and reaction (SILAR) method. Using these two well-controlled methods, CdS/WS 2 /ITO and WS 2 /CdS/ITO systems were fabricated. The loading of WS 2 nanosheets was controlled by the deposition condition and the heterojunction was optimized for enhanced photoelectrochemical response under simulated sunlight irradiation. The fabricated electrodes were characterized by various analytical techniques as well as PEC response and electrochemical impedance spectroscopy (EIS). Our results showed that the CdS/WS 2 /ITO heterojunction exhibits a stable photo-current density which is 3 times higher than the CdS/ITO electrode. In contrast, photo-current density of the WS 2 /CdS/ITO electrode was lower than that of the bare CdS/ITO, indicating that an appropriate energy level cascade is essential for achieving enhanced PEC response. A charge transfer mechanism was proposed to explain the observed PEC enhancement. This work indicates that the exfoliated WS 2 nanosheet is a promising material for stable photoelectrochemical applications.
研究领域:
材料科学
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能源科学
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Zhang Xianghua,Xu Hongxiang,Wang Jiangtao,Ye Xia,Lei Weining,Xue Maoquan,Tang Hua,Li Changsheng
In this paper, ultrathin WS 2 nanosheets with thickness of about 5 nm were successfully prepared by a facile solid phase reaction method. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). On the basis of experimental results obtained under different reaction durations, a possible formation mechanism of WS 2 nanosheets is proposed. The tribological performance of ultrathin WS 2 nanosheets as additives in the 500SN base oil was tested by an UMT-2 ball-on-disc tribotester, and the worn surface of the steel disc was investigated by a non-contact optical profile testing instrument and SEM. The results showed that the friction coefficient and anti-wear property of base oil can be improved strikingly by adding ultrathin WS 2 nanosheets. Especially, when the concentration of WS 2 nanosheets was 1.0 wt.%, the corresponding lubricating oil exhibited the best tribological properties. Moreover, according to the investigation of the wear scar, an anti-friction and anti-wear mechanism is proposed. It is believed that the reduction of friction and wear must come from the addition of ultrathin WS 2 nanosheets which can penetrate and enter the friction interface and form a continuous tribofilm on the rubbing face.
研究领域:
材料科学
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摩擦学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2019
·
IF 4.197
Jian Zhang,Dong Han,Shu Wang,Xiaodi Zhang,Ruiqi Yang,Yanchen Ji,Xin Yu
In this work, a WS 2 nanosheet/graphite microfiber hybrid electrode has been fabricated by in situ synthesis of WS 2 nanosheets on the surface of graphite microfibers. The WS 2 nanosheets possess an excellent electrocatalytic oxidation response towards adenine and guanine that encourages the adsorption of nucleobases and charge transfer at the surface of the microfibers. The WS 2 nanosheet/graphite microfiber hybrid electrode shows high sensitivity and selectivity for the detection of adenine and guanine. This hybrid microfiber electrode represents an excellent candidate platform for development of an electrochemical biosensor due to its low cost, flexibility and 3D morphology.
研究领域:
生物化学
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材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
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2023
·
IF 5.3
Tao Feng,Yufan Mo,Shuo Lv,Gang Liu
Integrating polyaniline (PANI) with two-dimensional (2D) nanostructures is a promising strategy to improve electrochemical performance. In this work, 2D laminar van der Waals heterostructures of graphene and WS2 nanosheets were prepared for the enhancement of the supercapacitive performance of PANI. With well-dispersed graphene/WS2 nanosheet hybrids (G-LS/WS2-LS) as deposition supports, the in situ polymerization of aniline delivered a ternary nanocomposite PANI/G-LS/WS2-LS. Benefiting from the good electrical conductivity and chemical stability of graphene, as well as the high redox activity of WS2, the ternary nanocomposite (PANI/G-LS/WS2-LS) exhibited significantly enhanced electrochemical performance as compared with PANI. Typically, a high specific capacitance of 421.5 F/g was delivered at a current density of 1 A/g in a three-electrode system, which is more than 1.5 times that of PANI (274.1 F/g at 1 A/g). Additionally, the symmetric supercapacitor based on PANI/G-LS/WS2-LS showed good electrochemical stability with a 71.6% capacitance retention after 10,000 cycles at 5 A/g and a high specific energy of 9.96 W h/kg at a specific power of 250.04 W/kg. The study provides a facile approach to boost the electrochemical performance of conductive polymers for efficient and reliable energy storage.
研究领域:
材料科学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2021
·
IF 13.273
Xiaomin Luo,Liyun Cao,Jianfeng Huang,Jiayin Li,Penghui Guo,Yong Wang,Zhanwei Xu,Koji Kajiyoshi
Growing tungsten disulfide (WS 2 ) on self-supporting carbon fiber cloth is an effective means to enhance the sodium storage. However, it is difficult for WS 2 to exhibit high stability and fast reaction kinetics on the surface of carbon fiber cloth. Herein, we construct a composite structure that WS 2 nanosheets are grown on the surface of carbon fiber cloth with many gaps. These gaps are poured by pyrolytic carbon structure. The composite structures expose lateral (0 0 2) crystal plane of WS 2 nanosheets (WS 2 /CFC@C-P). When WS 2 /CFC@C-P is evaluated as an anode material for sodium-ion batteries (SIBs), the exposed (0 0 2) lateral edge realizes the rapid migration of Na + with fast reaction kinetics. Moreover, the poured carbon stabilizes expanded WS 2 nanosheets to maintain original structure. Under the above merits, WS 2 /CFC@C-P could provide high reversible capacity (672 mAh g −1 after 200 cycles at 100 mA g −1 ) and rate capacity (657 mAh g −1 at 0.1 A g −1 and 230 mAh g −1 at 2 A g −1 ). Furthermore, they deliver 297 mAh g −1 after 500 cycles at 2 A g −1 with a low capacity fading of 0.96% per cycle. This work provides a new insight to develop high performance SIBs by introducing the fine regulation of carbon layer.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
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2022
·
IF 4
Xiaoliang Wang,Jingkun Wang,Zhongqiang Wang,Peng Dong,Min Zhao,Yuying Hao,Hua Wang
Abstact Two-dimensional (2D) transition metal dichalcogenides (TMDs) materials have been applied in organic solar cells (OSCs), which possess excellent light transmittance, good charge carrier selectivity and high mobility. Herein, high quality 2D material of tungsten disulfide (WS 2 ) nanosheets is synthesized by liquid exfoliation method, which is used to form a double-layer hole transport layer with soluble copper(I) thiocyanate (CuSCN). The introduction of WS 2 nanosheets smooth the surface of CuSCN hole transport layers (HTL) and modify the interface between CuSCN HTL and light absorber. The cells using double-layer CuSCN/WS 2 as HTL exhibit higher light photon utilization, weaker recombination loss compared to the reference cell with pristine CuSCN HTL. More importantly, it has been proved that the WS 2 nanosheets act as intermedium between light absorbers and CuSCN, which contribute to efficient hole extraction process. As a result, a champion power conversion efficiency (PCE) of 9.00% is obtained in PTB7-Th:PC 71 BM light absorber based cell using CuSCN/WS 2 as HTL, which is > 16% higher than the PCE of 7.75% achieved in reference cell with pristine CuSCN HTL. This result proves that 2D TMDs materials are promising candidates as charge selectivity for highly efficient solar cells.
研究领域:
材料科学
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能源科学
·
光电化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 24
·2201175
·
IF 6.389
Qiuguo Li,Hao Rao,Haijuan Mei,Zhengting Zhao,Weiping Gong,Andrea Camposeo,Dario Pisignano,Xianguang Yang
The integration of 2D nanomaterials with silicon is expected to enrich the applications of 2D functional nanomaterials and pave the way for next-generation, nanoscale optoelectronics with enhanced performances. Herein, a strategy for rare earth element doping is utilized for the synthesis of 2D WS 2 :Er nanosheets to achieve up-conversion and down-conversion emissions ranging from visible to near-infrared regions. Moreover, the potential integration of the synthesized 2D nanosheets in silicon platforms is demonstrated by the realization of an infrared photodetector based on a WS 2 :Er/Si heterojunction. These devices operate at room temperature and show a high photoresponsivity of ≈39.8 mA W −1 (at 980 nm) and a detectivity of 2.79 × 10 10 cm Hz 1/2 W −1 . Moreover, the dark current and noise power density are suppressed effectively by van der Waals-assisted p–n heterojunction. This work fundamentally contributes to establishing infrared detection by rare element doping of 2D materials in heterojunctions with Si, at the forefront of infrared 2DMs-based photonics.
研究领域:
材料科学
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光电子学
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纳米技术
✓ 已验证
DOI
高影响因子
DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 28
·9804-9810
·
IF 4.174
Guoteng Zhang,Zaitao Hao,Jie Yin,Chen Wang,Jinghao Zhang,Zhiyu Zhao,Denghu Wei,Huawei Zhou,Zhongcheng Li
The control of surface elements and nanostructures is one of the effective ways to design and synthesize high performance catalysts. Herein, we, for the first time, prepare FeS2 crystal lattices on WS2 nanosheets (FeS2 CL@WS2 NS) by solvothermal methods for the oxygen evolution reaction (OER). The FeS2 CLs effectively prevent the oxidation and aggregation of WS2 nanosheets and increase the electrochemically active surface area. The abundant surface defect in the FeS2 CL@WS2 NS electrocatalyst reduces the stress between the crystal lattices of FeS2 and that of WS2. The overpotential (260 mV) of the FeS2 CL@WS2 NS electrocatalyst for the OER at a current density of 10 mA cm−2 is superior to those of WS2 NS/Ni foam (310 mV) and IrO2/Ni foam (300 mV) in 1.0 M KOH solution. An electrochemical–kinetic study shows that the Tafel slope of 54 mV per decade for the FeS2 CL@WS2 NS electrocatalyst is lower than those of WS2 NS (102 mV per decade) and IrO2/Ni foam (77 mV per decade). In addition, the charge transport resistor (2.3 Ω) of the FeS2 CL@WS2 NS electrocatalyst for the OER is smaller than that of WS2 NS. These faster kinetic properties, in turn, explain the high catalytic activity of the FeS2 CL@WS2 NS electrocatalyst for the OER. The XPS and HRTEM results of the post stability sample confirm that Fe2+ and W4+ are oxidized after durability measurement. Thus, we think that the FeS2 CL@WS2 NS electrocatalyst is a promising candidate for efficient, low-cost, and stable non-noble-metal-based OER electrocatalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xiao Shang,Kai-Li Yan,Zi-Zhang Liu,Shan-Shan Lu,Bin Dong,Jing-Qi Chi,Xiao Li,Yan-Ru Liu,Yong-Ming Chai,Chen-Guang Liu
Oxidized carbon fiber (oCF) as support successfully realizes the vertical growth of uniform WS 2 nanosheets arrays for efficient hydrogen evolution reaction (HER) via a facile hydrothermal process. Thanks to oxygen functional groups on oCF, vertical WS 2 nanosheets structures have grown more easily on oCF, which can provide better dispersion, short charge transfer distance and more exposed active sites for HER in comparison with bulk WS 2 and WS 2 nanosheets on bare carbon fiber (CF) fabricated at the same condition. The electrochemical measurements confirmed that WS 2 /oCF possesses better HER activity than bulk WS 2 and WS 2 /CF. Especially, the 10-h stability with unchanged vertical WS 2 nanosheets morphology further demonstrate the positive effect of oxygen functional groups on the enhanced vertical structure and close combination between WS 2 and oCF. It may offer a facile way to realize more exposed active sites from stable electrocatalyst hybrids of transition metal sulfides by surface oxidization of carbon supports.
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
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）