Nanomaterials
·
2019
·Vol. 9
·期 6
·840
·
IF 4.034
Xianghua Zhang,Jiangtao Wang,Hongxiang Xu,Heng Tan,Xia Ye
This paper presents the facile synthesis of two different morphologies of WS2nanomaterials—WS2hexagonal nanoplates and nanoflowers—by a sulfurization reaction. The phases and morphology of the samples were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The tribological performance of the two kinds of WS2nanomaterials as additives in paraffin oil were measured using a UMT (Universal Mechanical Tester)-2 tribotester. The results demonstrated that the friction and wear performance of paraffin oil can be greatly improved with the addition of WS2nanomaterials, and that the morphology and content of WS2nanomaterials have a significant effect on the tribological properties of paraffin oil. The tribological performance of lubricating oil was best when the concentration of the WS2nanomaterial additive was 0.5 wt %. Moreover, the paraffin oil with added WS2nanoflowers exhibited better tribological properties than paraffin oil with added WS2hexagonal nanoplates. The superior tribological properties of WS2nanoflowers can be attributed to their special morphology, which contributes to the formation of a uniform tribo-film during the sliding process.
研究领域:
材料科学
·
摩擦学
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Hengyang Liu,Yong Xu,Enzhu Hu,Kunhong Hu
Finding ways to improve the performance of additives is critical to meeting the industrial demand for high-performance lubricants. A WS 2 /MoS 2 micro-nano composite was synthesized by coating nano-MoS 2 onto activated micro-WS 2 to enhance nano-MoS 2 lubrication. The WS 2 /MoS 2 in base oil significantly reduced the wear by 65.3 % and 46.4 % compared to micro-WS 2 and nano-MoS 2 , respectively. In the WS 2 /MoS 2 , WS 2 isolates and lubricates the friction pair through its layered structure, but contributes minimally to tribofilm formation. Nano-MoS 2 , with its high reactivity, exfoliates into nanosheets that transfer to the friction surface to form the tribofilm, working alongside compounds like Fe 2 (SO 4 ) 3 and Fe 3 O 4 to enhance lubrication. This work provides a way to improve the performance of lubricants and demonstrates potential applications in lubricating oil modification.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2018
·
IF 3.246
Ziyan Lu,Zhenzhen Cao,Enzhu Hu,Kunhong Hu,Xianguo Hu
A method was developed to prepare WS 2 and WS 2 /TiO 2 nanoparticles . A blue tungsten oxide precursor was synthesized from Na 2 WO 4 , CH 3 CSNH 2 , and HCl. WS 2 nanoplatelets was produced after sulfurizing the precursor at 300 °C. Nano-TiO 2 could be activated by HCl and provide active sites for the deposition of the precursor to produce WS 2 /TiO 2 nanoparticles after sulfurization. The as-prepared two nano-additives slightly affected the friction reduction of diisooctyl sebacate (DOS), but they, especially WS 2 /TiO 2 , remarkably improved the wear resistance of DOS. Compared with the pure DOS, the 0.75% WS 2 /TiO 2 -containing DOS decreased the wear volume by ∼81%. The anti-wear performance of WS 2 /TiO 2 is ascribed to the formation of a lubricating film and the synergistic lubrication effect of WS 2 and TiO 2 .
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Qijian Niu,Oluwafunmilola Ola,Nannan Wang,Binling Chen,Yanqiu Zhu,Yongde Xia
In this work, Co 9 S 8 and N,S co-dopped carbon encapsulated WS 2 nanocomposites (Co 9 S 8 -N,S-C@WS 2 ) has been successfully prepared through a high-temperature carbonization of the precursor ZIF-67@WS 2 nanoparticles. The obtained Co 9 S 8 -N,S-C@WS 2 nanoparticles were confirmed to have a core-shell structure and uniform element distribution by TEM and element mapping. Its crystal structure was characterized by XRD, and the high specific surface areas with porous structure was characterized by BET tests. The as-prepared Co 9 S 8 -N,S-C@WS 2 nanoparticles exhibited a better ORR/OER/HER performance than single component. In this work, a novel idea for the preparation of functional nanocomposite materials could be provided.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2016
·
IF 0
Jian Wu,Cheng Zhang,Jin Feng Xia,Dan Yu Jiang
In this study, Yttria-stabilized zirconia (YSZ) electrochemical sensors attached with the WS2 sensing electrode (SE) were fabricated and examined for NO2 sensing properties. Due to its internal stratiform structure, surface and edge of the lamella have high chemical activity, WS2 was used as a kind of highly efficient catalyst. WS2 was partial oxidated to WO3 at 400°C, and with the increment of temperature, oxidation will accelerate. The ΔEMF to 500 ppm NO2 was as high as 125mv at 400°C, while the value of WO3-based sensor was as small as 10 mv in the same condition. These WS2-attached devices gave a linear correlation between EMF and the logarithm of NO2 concentration from 30 to 500 ppm in the temperature range 350–500°C. The response time of the device is about 1 min at 400°C.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
Materials
·
2019
·Vol. 12
·期 12
·1883
·
IF 2.972
Zhuhua Xu,Yanfei Lv,Feng Huang,Cong Zhao,Shichao Zhao,Guodan Wei
Monolayer tungsten disulfide (2D WS2) films have attracted tremendous interest due to their unique electronic and optoelectronic properties. However, the controlled growth of monolayer WS2is still challenging. In this paper, we report a novel method to grow WS2through chemical vapor deposition (CVD) with ZnO crystalline whisker as a growth promoter, where partially evaporated WS2reacts with ZnO to form ZnWO4by-product. As a result, a depletion region of W atoms and S-rich region is formed which is favorable for subsequent monolayer growth of WS2, selectively positioned on the silicon oxide substrate after the CVD growth.Keywords:monolayer WS2;ZnO;CVD;controlled growth
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2016
·
IF 2.101
Liyan Zhou,Shancheng Yan,Zixia Lin,Yi Shi
Two-dimensional transition-metal dichalcogenides, such as tungsten disulfide (WS 2 ), have been actively studied as suitable candidates for anode materials used in lithium ion batteries recently, due to their remarkable ion intercalation properties. However, the difficulties in the synthesis of phase-pure WS 2 , restacking between WS 2 nanosheets, low electronic conductivity and brittle nature of WS 2 severely limit its Li-ion batteries application. Here, we adopt a one-pot method for synthesizing of WS 2 /reduced Graphene Oxide (rGO) composite to improve the battery performance dramatically. The WS 2 /rGO anode shows a stable discharge capacity of 431.2 mAh/g, at a current density of 0.1 A/g after 100 cycles, while the capacity of bare WS 2 is only 65.5 mAh/g under the same condition. The added graphene oxide is reduced to rGO in reaction process and constitute stable composite with WS 2 , not only avoiding the restacking between WS 2 nanosheets and improving the conductive properties, but also promoting the reduction of WO 3 effectively. Our work may provide a possible route to avoid oxygen impurities in transition metal dichalcogenides .
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
·
2017
·Vol. 55
·期 13
·997-1004
·
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
Nanoscale
·
2015
·Vol. 7
·期 42
·17771-17777
·
IF 7.394
Hui Long,Lili Tao,Chun Yin Tang,Bo Zhou,Yuda Zhao,Longhui Zeng,Siu Fung Yu,Shu Ping Lau,Yang Chai,Yuen Hong Tsang
To control the optical properties of two-dimensional (2D) materials is a long-standing goal, being of both fundamental and technological significance. Tuning nonlinear optical absorption (NOA) properties of 2D transition metal dichalcogenides in a cost effective way has emerged as an important research topic because of its possibility to custom design NOA properties, implying enormous applications including optical computers, communications, bioimaging, and so on. In this study, WS2 with different size and thickness distributions was fabricated. The results demonstrate that both NOA onset threshold, FON, and optical limiting threshold, FOL, of WS2 under the excitation of a nanosecond pulsed laser can be tuned over a wide range by controlling its size and thickness. The FON and FOL show a rapid decline with the decrease of size and thickness. Due to the edge and quantum confinement effect, WS2 quantum dots (2.35 nm) exhibit the lowest FON (0.01 J cm−2) and FOL (0.062 J cm−2) among all the samples, which are comparable to the lowest threshold achieved in graphene based materials, showing great potential as NOA materials with tunable properties.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 10
·103507
·
IF 4.316
Fuhua Chen,Hao Guo,Lili Zhao,Xin Guo,Shunchang Li,Ying Chu,Xueying Wang,Yongping Zhu
As a cathode material for thermal batteries, WS2 has high thermal decomposition temperature and large specific capacity, but it is an intermittent semiconductor, with relatively low conductivity. This low conductivity can prolong the activation time and reduce the discharge specific capacity of thermal batteries. Here, we prepared WS2 with sulfur vacancies through a simple high-temperature annealing method and used electron paramagnetic resonance spectroscopy and X-ray photoelectron spectroscopy to detect the presence of sulfur vacancies. The result shows that sulfur vacancies were successfully introduced in WS2, and the existence of sulfur vacancies can effectively improve the discharge performance of thermal batteries. While maintaining the nanostructure, the thermal decomposition temperature still exceeds 1000 °C, which is far beyond the traditional FeS2 (550 °C) and CoS2 (650 °C) cathodes. The Li-B/LiF-LiBr-LiCl/WS2 with sulfur vacancies (treated at 500 °C) couple has higher discharge specific capacity (when the cut-off voltage is 0.5 V, it is 380.58 mAh g−1, which is 14.85% higher than the original WS2) and lower total polarization (about 21% lower than original WS2). This work provides a beginning for further study of sulfur vacancies defect materials as the cathode of thermal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2019
·Vol. 6
·期 11
·115084
·
IF 1.449
Feng Huang,Yanfei Lv,Siwei Zhang,Guodan Wei,Shichao Zhao
Monolayer Tungsten disulfide (WS2) shows unique optoelectronic properties and has potential applications in nanodevices. However, the stability of the monolayer WS2 exposed in the ambient condition should be evaluated and improved before its practical application. In this paper, we investigated the shape, structure, and luminescence of the monolayer WS2 under heating and corona discharge conditions in air. We show that monolayer WS2 without any coating film is unstable under such practical condition. To protect the monolayer, we covered a layer of polymethyl methacrylate (PMMA) on the surface of the monolayer WS2 and found the stability was improved.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 53
·期 2
·899-906
·
IF 2.1
Wang Caiyun,Zhou Yanhong,Liu Zhimin
A composite of WO 3 and WS 2 has a wider wavelength range of light adsorption and light emission than WS 2 . A noble metal nanostructure can be utilized to adjust the photoluminescence (PL) of luminescent materials. In this study, WO 3 -WS 2 flakes were synthesized. A straightforward bath method has been employed to synthesize Ag nanoparticles (NPs). The average size of Ag NPs is approximately 60 nm. The Fourier transform infrared (FT-IR) peak of WO 3 -WS 2 flake at 495 cm −1 is from an alkane S–S bond stretching vibration. The PL intensity of WO 3 -WS 2 was attenuated subsequent to its integration with Ag NPs. The PL quantum yield of the WO 3 -WS 2 /Ag composite can reach 0.11%. This occurrence can be explained by the pronounced resonance absorption and diminished light extraction induced by the Ag NPs. This decreased light emission of the Ag NPs incorporated with WO 3 -WS 2 may be employed in some situations needing extinction, such as photography and projection. Graphical Abstract
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）