Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Jianhui Yan,Yi Wang,YuanJun Guo
Cu-WS 2 composites are being used as self-lubricating materials for various engineering applications. The poor wettability between Cu and WS 2 is a main obstacle for obtaining high-performance Cu-WS 2 . In order to improve the wettability, a thin Cu layer was deposited on the surface of the WS 2 powder through an electroless plating technology. Cu-WS 2 composites were prepared via spark plasma sintering (SPS) using the mix powders of Cu and Cu-WS 2 . Microstructure, mechanical properties and tribological properties of the Cu-WS 2 composites were investigated, and that of the Cu were also comparatively studied. Results show that the WS 2 powder coated with Cu (abbreviated as WS 2 @Cu powder) improves the poor wettability between Cu and WS 2 and meanwhile the distribution of WS 2 . Cu-WS 2 composites sintered below 750 °C could reduce the reaction between Cu and WS 2 and ensure more WS 2 in the composites. Both the coefficient of friction (COF) and the wear rate of the Cu-WS 2 are lower than that of the Cu. A lubricant film leads to the excellent tribological properties as the Cu-WS 2 composites were tested at 25−200 °C. However, the disappearance of WS 2 and the formation of Cu 2 O cause to the decreasing self-lubricating performances at 300−500 °C. With an increase in the test temperature, the dominant wear mechanisms of the Cu-WS 2 composites change from adhesive wear to a mixture of abrasive and oxidation wear, and that of the Cu change from adhesive wear to a mixture of fatigue and oxidation wear.
研究领域:
材料科学
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摩擦学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Nan Xin,Yifei Li,Guihua Tang,Tian Lan,Jimin Xu,Xin Zhao,Min Zhang,Yinan Nie,Hao Shen
Thermoelectric materials have great potential in the energy recovery and environmental protection, and thermoelectric films can also effectively achieve heat dissipation of the chip through thermoelectric refrigeration. WS 2 films show good thermoelectric performance in prediction, but the figure of merit ( ZT ) of the synthesized WS 2 films still needs improvement. In this work, Cu was doped into WS 2 films by magnetron sputtering combined with chemical vapor deposition and sulfurization annealing. Cu doping narrowed the band gap and increased the hole concentration from 5.6 × 10 19 cm −3 to 2.2 × 10 21 cm −3 , greatly improved the electrical properties of WS 2 film. At 300 K, the electrical conductivity and power factor of Cu-doped films increased by 1086 % and 575 % compared to pristine WS 2 , respectively. In addition, Cu doping reduced the grain size and introduced more grain boundaries, which decreased the in-plane thermal conductivity to as low as 0.22 W m −1 K −1 at 300 K. The coupling of the electrical and thermal properties optimization greatly improved ZT . The ZT value of Cu 5.5 -WS 2 films is as high as 0.181 at 425 K. This work provides a new idea for improving the thermoelectric performance of transition metal dichalcogenides (TMDCs) films.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 14
·5287-5296
·
IF 3.069
Xueshan Jing,Zhiguang Guo
Fabricating conductive materials based on sponges is applicable to many fields due to their outstanding performance. However, superhydrophobic conductive sponges are not only easily damaged by water but also have a complicated production process, which severely limit their working conditions and large-scale preparation. In this work, conductive sponges involving multiple superior characteristics of superhydrophobicity, excellent electrical conductivity, thermo-stability, and mechanical and chemical durability are fabricated based on WS2 nanosheets and modified Ag nanoparticles (M-AgNPs) via a one-step method. More importantly, when immersed in water, the resistance of the WS2&M-AgNPs superhydrophobic conductive sponge remained unchanged which is beneficial for adaptations in working conditions. In addition, in order to ensure the normal use of various sensors in the natural environment, WS2&M-AgNPs conductive sponges possessed the important ability of thermo-stability and the resistance had little change in the temperature range 0 °C to 40 °C. Even after suffering 2400 compressions, the superhydrophobic sponges recovered their original shape and retained outstanding hydrophobicity, which highly prolonged the lifetime of the pedometer. The conductive sponges retained excellent hydrophobicity in the pH range 1 to 14. It was noted that the superhydrophobic conductive sponges showed a linear relationship between resistance and compressed distance. According to this linear relation, a pressure sensor fabricated using this sponge can measure multiple parameters such as weight and depth of water. Herein, a simple preparation method is provided to fabricate superhydrophobic conductive sponges, which expands the working conditions and may be a breakthrough for traditional sensor preparation.
研究领域:
材料科学
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传感器技术
✓ 已验证
产品关联
DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2022
·
IF 12.92
Chao Ding,Chengxiao Zhao,Shi Cheng,Xiaofei Yang
Solar-powered photocatalytic hydrogen production from water using semiconductors provides an eco-friendly and promising approach for converting solar energy into hydrogen fuel. Bulk semiconductors generally suffer from certain limitations, such as poor visible-light utilization, rapid recombination of charge carriers, and low catalytic capability. The key challenge is to develop visible-light-driven heterojunction photocatalysts that are stable and highly active during the water splitting process. Here, we demonstrate the integration of one-dimensional (1D) CdS nanorods with two-dimensional (2D) 1T-phase dominated WS 2 nanosheets for constructing mixed-dimensional heterojunctions for the photocatalytic hydrogen evolution reaction (HER). The resulting 1D CdS/2D WS 2 nanoheterojunction exhibited an ultrahigh hydrogen-evolution activity of ∼70 mmol·g −1 ·h −1 that was visible to the naked eye, as well as long-term stability under visible light illumination. The results reveal that the synergy of hybrid nanoarchitectures and intimate interfacial contact between the 1D CdS nanorods and 1T-phase dominated 2D WS 2 nanosheets facilitates charge carrier transport, which is beneficial for achieving superior hydrogen evolution.
研究领域:
材料科学
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能源科学
✓ 已验证
产品关联
DOI
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
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Yunfan Lin,Donglin Han,Yuan Li,Lei Tan,Xiangmei Liu,Zhenduo Cui,Xianjin Yang,Zhaoyang Li,Yanqin Liang,Shengli Zhu,Shuilin Wu
On a global scale, bacterial infection has become a huge threat to human health. Taking into consideration the increasing drug-resistance bacteria, it is urgent to develop novel nonantibiotics strategies to kill bacteria rapidly. Herein, Ag2S@WS2 was developed as a new kind of antibacterial agent, where exfoliated WS2 nanosheets were decorated with Ag2S nanoparticles through in situ growth. Under near-infrared (NIR) light irradiation (808 nm), the tight contact between Ag2S and WS2 endowed the composite with outstanding photocatalytic property, which was attributed to effective separation of photoactivated electronics and holes. Because of the synergistic effect of photocatalytic and photothermal properties, highly effective antibacterial efficacy could be achieved for Ag2S@WS2 within 20 min NIR light irradiation, that is, 99.93% toward Staphylococcus aureus and 99.84% toward Escherichia coli. Moreover, the in vitro cell culture test showed that the synthesized Ag2S@WS2 was noncytotoxic. These results demonstrate that Ag2S@WS2 can be a promising material for rapid and highly effective disinfection under NIR irradiation.
研究领域:
材料科学
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生物医学工程
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微生物学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2019
·Vol. 11
·期 1
·1-15
·
IF 9.043
Zhang Deqing,Liu Tingting,Cheng Junye,Cao Qi,Zheng Guangping,Liang Shuang,Wang Hao,Cao Mao-Sheng
Two-dimensional (2D) nanomaterials are categorized as a new class of microwave absorption (MA) materials owing to their high specific surface area and peculiar electronic properties. In this study, 2D WS 2 –reduced graphene oxide (WS 2 –rGO) heterostructure nanosheets were synthesized via a facile hydrothermal process; moreover, their dielectric and MA properties were reported for the first time. Remarkably, the maximum reflection loss (RL) of the sample–wax composites containing 40 wt% WS 2 –rGO was − 41.5 dB at a thickness of 2.7 mm; furthermore, the bandwidth where RL < − 10 dB can reach up to 13.62 GHz (4.38–18 GHz). Synergistic mechanisms derived from the interfacial dielectric coupling and multiple-interface scattering after hybridization of WS 2 with rGO were discussed to explain the drastically enhanced microwave absorption performance. The results indicate these lightweight WS 2 –rGO nanosheets to be potential materials for practical electromagnetic wave-absorbing applications.
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 Materials Chemistry C
·
2022
·Vol. 10
·期 48
·18164-18173
·
IF 8.067
Weifeng Kong,Zipeng Xing,Hang Zhang,Bin Fang,Yongqian Cui,Zhenzi Li,Peng Chen,Wei Zhou
A hollow polyhedral structure can effectively capture light and facilitate carrier separation, thus enhancing photocatalytic performance. Herein, hollow cubic CdS@CoS/WS2 dual S-scheme heterojunction superstructure photocatalysts are fabricated using a simple sulfidation and hydrothermal method. CdS@CoS/WS2 with a band gap of 1.59 eV and a relatively narrow band gap broadens the photoreaction to the near-infrared region and shows a good photothermal effect, which can promote photocatalytic reactions. It shows a relative specific surface area of 91.58 m2 g−1, which provides abundant surface-active sites to enhance the photocatalytic reaction. Under light conditions, the photocatalytic degradation ratios of CdS@CoS/WS2 for tetracycline and bisphenol A are up to 98.9 and 99.1%, and the hydrogen evolution efficiency is also up to 10.62 mmol h−1 g−1. The enhanced photothermal–photocatalytic performance could be due to the formation of a dual S-scheme heterojunction superstructure that facilitates space charge separation, a narrow band gap and a mesoporous hollow structure promoting solar light utilization, providing abundant surface-active sites and enhanced mass transfer. This simple strategy provides a new idea for the construction of high-performance hollow superstructure photocatalysts.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Ziyu Qin,Xiaoxiao Song,Junyong Wang,Xiang Li,Congyi Wu,Xiaoxia Wang,Xueqiong Yin,Dawen Zeng
For the important applications of gas identification related to specific diseases in healthcare, flexible gas sensors have attracted more attention. Among them, two-dimensional transition metal dichalcogenides (2D TMDs) have been known as good promising flexible gas-sensitive materials. While how to tightly attach 2D materials on flexible substrates is still challenging. Here, we propose an enhanced room-temperature flexible paper-substrate sensors based on 2D tungsten disulfide (WS 2 ) with S defects, which are facilely synthesized by chemical exfoliation and vacuum filtration method. Structure characterization shows that most of the as-prepared 2D WS 2 are within 3 layers. Spectroscopic characterization proves the existence of S defects on the surface of 2D WS 2 produced by chemical exfoliation. The room-temperature (25 °C) NH 3 gas sensitivity results show that the response intensity of 2D WS 2 with rich S defects is nearly three times higher than the highly crystalline 2D WS 2 . The results of the flexible gas sensitivity indicate the fast response and high stability of our devices in breathing detection and bending experiments. Furthermore, the devices can effectively distinguish bending stress changes and gas-sensitive response signals at the same time, realizing multifunctional sensing detection. Our work will be a reference for fabricating flexible sensors based on 2D materials.
研究领域:
材料科学
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生物医学工程
·
气体传感技术
✓ 已验证
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Huihui Yu,Yunan Wang,Haoran Zeng,Zhihong Cao,Qinghua Zhang,Li Gao,Mengyu Hong,Xiaofu Wei,Yue Zheng,Zheng Zhang,Xiankun Zhang,Yue Zhang
Two-dimensional (2D) van der Waals (vdWs) heterojunctions have been actively investigated in low-power-consumption and fast-response photodiodes owing to their atomically smooth interfaces and ultrafast interfacial charge transfer. However, achieving ultralow dark current and ultrafast photoresponse in the reported photovoltaic devices remains a challenge as the large built-in electric field in a heterojunction can not only speed up photocarrier transport but also increase the minority-carrier dark current. Here, we propose a high-spike barrier photodiode that can achieve both an ultralow dark current and an ultrafast response. The device is fabricated by the Te/WS2 heterojunction, while the band alignment can transition from type-II to type-I with a high electron barrier and a large hole built-in electronic field. The high electron barrier can greatly reduce the drift current of minority carriers and the generation current of the thermal carriers, while the large built-in electronic field can still speed up the photocarrier transport. The designed Te/WS2 vdWs photodiode yields an ultralow dark current of 8 × 10–14 A and an ultrafast photoresponse of 10/13 μs. Furthermore, a high-performance visible-light imager with a pixel resolution of 100 × 40 is demonstrated using the Te/WS2 vdWs photodiode. This work provides a comprehensive understanding of designing 2D-material-based photovoltaics with excellent overall performance.
研究领域:
材料科学
·
光子学
·
纳米技术
✓ 已验证
DOI
高影响因子
ChemElectroChem
·
2020
·Vol. 7
·期 14
·3082-3088
·
IF 4.154
Jinzhou Yang,Zong-Bao Yu,Wei Sun,Yue Li,Hongda Wu,Zhongxing Geng,Zhanxu Yang
Graphical One for both : A composite catalyst consisting of WP nanorods, WS 2 , and carbon is presented here. It demonstrates hydrogen evolution reaction (HER) activity and long-term chronopotentiometric stability as well as suitability in both acid electrolyte and alkaline electrolyte. Thorough characterization is performed to uncover the reasons behind uncover the enhanced HER. Through a stepwise synthesis, intercalation followed by chemical vapor deposition (CVD) method, WP nanorods have been grown on the surface of WS 2 /C composite. Compared to WS 2 /C, WP nanorods@WS 2 /C demonstrate better hydrogen evolution reaction (HER) activity and long-term chronopotentiometric stability as well as suitability in both acid electrolyte and alkaline electrolyte. In order to uncover the enhanced HER property reason, systematic characterizations were applied to assist analyzing. The characterizations used include X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), electrochemical active surface area (ECSA), Raman, and BET. Based on the analysis, it points that improved ECSA, synergy between WS 2 and WP nanorods, and enhanced degree of graphitization as well, leads to better HER activities of WP nanorods@WS 2 /C over WS 2 /C. This work highlights significant role of WP nanorods in WP/WS 2 /C three-phase composite in electrocatalytic hydrogen evolution and may evoke new interest in related nanostructure study.
研究领域:
材料科学
·
电化学
·
纳米技术
✓ 已验证
产品关联
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
·
光电子学
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）