LANGMUIR
·
2023
·
IF 3.9
Jinzhu Zhang,Min Zhang,Shuying Wang,Zhaofeng Wu,Ze Zhang
This study reports the synthesis of CdS/WS2 composites via a green and ultra-low-cost hydrothermal method. By controlling the relative mass ratio between WS2 and CdS, an n–n type CdS/WS2 heterostructure, with excellent NH3 gas-sensitive properties, was developed and investigated at room temperature. Compared with pristine WS2 and CdS, the CdS/WS2-40%wt composite exhibited excellent selectivity of more than 4 orders of magnitude for sensing NH3, a very short recovery time of 3 s, and ultrahigh selectivity at room temperature. The large specific surface area of the CdS/WS2 composite increased the active sites for the gas-sensitive reaction. Additionally, the 2D morphology of CdS/WS2 and the heterojunction formed between WS2 and CdS contributed to the improved performance. Anti-humidity interference tests showed that the CdS/WS2 sample remained stable under real-time monitoring of NH3 at different ambient humidity values. This study paves the way for designing high-performance gas sensors operating at room temperature.
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Li Li,Jiumao Cai,Yunhui Yan,Fengying Zhao,Jianguo Zhou
Novel flower-like direct Z-scheme WS 2 /Bi 2 O 2 CO 3 photocatalyst was fabricated via a one-pot hydrothermal method . The structure, morphology, together with the optical and photoelectrochemical properties of the photocatalysts were analyzed by various techniques. The flower-like WS 2 /Bi 2 O 2 CO 3 photocatalyst exhibited efficient removal of Lanasol Red 5B, with rate constants of 1.85 and 3.23 times higher than that of Bi 2 O 2 CO 3 under UV and simulated solar irradiation, respectively. Additionally, the flower-like WS 2 /Bi 2 O 2 CO 3 photocatalyst exhibited 95% ciprofloxacin removal efficiency within 90 min. The enhanced photocatalytic activity of optimal WS 2 /Bi 2 O 2 CO 3 could be attributed to the synergistic effect of the effective photoinduced charge carrier separation and transfer, the enhanced light harvesting ability and larger specific surface area. Furthermore, the active species trapping and ESR experiments indicated that hole (h + ), superoxide radical (•O 2 − ) and hydroxyl radical (•OH) were main reactive species in the photocatalytic process. The WS 2 /Bi 2 O 2 CO 3 heterojunction was speculated to follow a Z-scheme charge transfer mechanism. This facile method provides new possibilities for the fabrication of effective Bi 2 O 2 CO 3 -based photocatalysts for environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
WEAR
·
2021
·
IF 3.892
Tiancheng Ouyang,Wenwu Lei,Wentao Tang,Yudong Shen,Chunlan Mo
The development of eco-friendly lubricant is the requirement of the times. In this paper, the modified IF-WS 2 nanoparticles are added to castor oil as additives to prepare mixed lubricant. The lubrication performances of the mixed oil are investigated by ball-on-disc rotary friction tester, and then the surface scratches are characterized by depth of field digital microscope, scanning electron microscope and Raman spectrometer. Experiments reveal that compared with the base oil, the friction coefficient and worn volume decrease by 27.4% and 47.2% after adding modified IF-WS 2 as additives under 300 rpm and 5 N conditions, respectively. From mechanism analysis, this improvement in lubrication performance is attributed to the polarity of castor oil and the unique pressure bearing structure and dispersion stability of modified IF-WS 2 , which makes that the castor oil molecules can better adsorb around the modified IF-WS 2 to form heavy loading bearing friction oil film so as to reduce friction and wear. In summary, results indicate the mixture of modified IF-WS 2 nanoparticles and vegetable lubricating oil has an attractive prospect in the field of environmentally-friendly products.
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
·
2022
·
IF 5.62
Shifan Li,Conglin Dong,Chengqing Yuan,Xiuqin Bai
High performance materials with low friction and high vibration-absorbing properties play a vital role in stable operation of water-lubricated ship stern bearings. Therefore, a TPU composite material reinforced by WS 2 and UHMWPE was prepared. After friction and vibration tests, it was found that WS 2 reduced the coefficient of friction of TPU matrix with its excellent lubricating properties, and after adding UHMWPE, the coefficient of friction continued to drop to 0.07 and became more stable during the whole friction process . The synergistic effect of WS 2 and UHMWPE effectively reduced the friction and amplitude of the composite and made the composite present the best tribological and vibration-absorbing performance. This research provided a basis for the design of new water-lubricated ship bearing materials .
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
RSC Advances
·
2019
·Vol. 9
·期 17
·9613-9619
·
IF 3.049
Jimin Yang,Lei Gao,Cheng Peng,Wei Zhang
In this work, a novel self-signal DNA electrochemical biosensor was constructed based on tungsten disulfide (WS2) nanosheets combined with poly(indole-6-carboxylic acid) (PIn6COOH) as the sensing interface. The WS2 nanosheets were synthesized via a simple solvent exfoliation method from bulk WS2, and then PIn6COOH was electropolymerized on the WS2 nanosheet-modified carbon paste electrode to obtain a unique nanocomposite. The electropolymerization efficiency was remarkably improved, ascribed to the physical adsorption between WS2 nanosheets and aromatic In6COOH monomers, resulting in an increase of the electrochemical response of PIn6COOH. Owing to the presence of π–π interactions between the conjugated PIn6COOH/WS2 nanocomposite and DNA bases, the probe ssDNA was noncovalently assembled on the nanocomposite substrate. After the hybridization of the probe ssDNA with the target DNA, the formation of the double-helix structure induced the resulting dsDNA to be released from the surface of the conjugated nanocomposite, accompanied with the self-signal regeneration of the nanocomposite (“signal-on”). The constructed PIn6COOH/WS2 nanocomposite was not only employed as an interface for DNA immobilization but also reflected the signal transduction stemming from DNA immobilization and hybridization without any external indicators or complex labeling processes. A detection limit of 2.3 × 10−18 mol L−1 has been estimated and a dynamic range of 1.0 × 10−17 mol L−1 to 1.0 × 10−11 mol L−1 has been shown for the detection of a PIK3CA gene related to lung cancer. Selectivity of the biosensor has been researched in the presence of noncomplementary and base mismatched DNA sequences.
研究领域:
生物传感技术
·
医学诊断
·
纳米材料科学
✓ 已验证
DOI
PubMed
高影响因子
IONICS
·
2022
·Vol. 28
·期 7
·3453-3460
·
IF 2.961
Chen Fuhua,Guo Hao,Zhao Lili,Chu Ying,Wang Xueying,Zhu Yongping
Traditional cathode materials can no longer meet the development needs of thermal batteries, and the research of new cathode materials is imminent. In this study, WS 2 was successfully prepared by a simple one-step synthesis method. X-ray photoelectron spectroscopy (XPS) showed that it has good electrical conductivity, its bandgap had been calculated by ultraviolet–visible diffuse reflectance spectroscopy (UV-visDRS), and its thermal decomposition temperature exceeded 1000 °C by thermogravimetric (TG) analysis. Due to the high decomposition temperature and high electronic conductivity of WS 2 , LiBr–LiCl–LiF electrolyte with high ionic conductivity but the high melting point was selected. The structure and composition of WS 2 and LiBr–LiCl–LiF after reaction at high temperature (500 °C) were studied, and WS 2 was found to have good compatibility with ternary lithium electrolyte. Assembling Li–B/LiBr–LiCl–LiF/WS 2 single thermal battery, the discharge specific capacity is 952As g −1 at 300 mA cm −2 and cutoff voltage of 0.97 V. And the internal resistance of the single thermal battery is 11.87 mΩ under the super large pulse current density of 5A cm −2 . This further advances the application of WS 2 in thermal batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
SYNTHETIC METALS
·
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
·
能源科学
·
光电化学
✓ 已验证
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Yajuan Li,Qiongfang Wang,Xin Zhang,Lei Dong,Cheng Peng,Min Zhang,Yulin Yuan,Pinhua Rao,Naiyun Gao,Chaoqun Tan
The residues of antibiotics in the environment posed serious threat to public health and aquatic ecosystem . This study synthesized a catalyst FeOOH@WS 2 as activator for persulfate (PS)-based advanced oxidation processes (AOPs) system, with sulfachloropyridazine (SAP) as the target pollutant. In the FeOOH@WS 2 /PS system, influence factors such as catalyst dosage, PS concentration, solution pH, inorganic anions and natural organic matter, which could affect the catalytic efficiency for SAP degradation were conducted. Results demonstrated that increasing FeOOH@WS 2 doses and PS concentrations sped up SAP’s rate of degradation. Besides, HO⋅, SO 4 •− , O 2 •− and 1 O 2 were existed by using the radicals quenching experiments and electron paramagnetic resonance spectrometry (EPR) analysis. It was found that 1 O 2 dominated the rapid SAP degradation. According to the intermediates found by analysis, the SAP degradation mechanism was postulated. Additionally, characterization and recycle results implied that the stability and durability of FeOOH@WS 2 were also outstanding.
研究领域:
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2020
·
IF 14.588
Yinzhu Jiang,Hao Wang,Shiya Wen,Huanjun Chen,Shaozhi Deng
Recently, resonance coupling between plasmonic nanocavity and two-dimensional semiconductors has attracted considerable attention. Most of the previous studies have focused on demonstrating this effect with light scattering or reflection spectroscopy, while the photoluminescence (PL) spectrum can help ascertain the underlying physics. Here, we report on the light-emitting characteristics of a monolayer WS2 flake coupled with a plasmonic gold nanorod. We construct a heterostructure by integrating an individual gold nanorod on top of a small piece of monolayer WS2, where the WS2 area is determined by the projected area of the nanorod. In such a heterostructure, the background PL from the uncoupled WS2 can be suppressed, which allows us to characterize the resonance coupling effect using correlated single-particle dark-field (DF) scattering and PL spectroscopies. Distinct mode splitting and anticrossing dispersion are observed in the scattering spectra, which originate from the resonance coupling between the excitons in the WS2 and plasmon resonance in the gold nanorod. In addition, a 1187-fold enhancement is obtained for the light emitted from the heterostructure relative to that of the pristine monolayer WS2. The emission spectra are broadened with mode-splitting features at room temperature, which can be further decomposed into two resonance modes using a coupled mode analysis. Moreover, two PL modes are polarized along the longitudinal axis of the gold nanorod. These findings show the potential of the designed individual gold nanorod–monolayer WS2 heterostructure as a platform for studying the resonance coupling effect between plasmon resonance and two-dimensional excitons.
研究领域:
光学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Hongwei Luo,Chenyang Liu,Ying Cheng,Yifeng Zeng,Dongqin He,Xiangliang Pan
The biggest problem with Fe/PMS (peroxymonosulfate) system is the slow generation rate of SO 4 − due to inefficient Fe 3+ /Fe 2+ cycle and the low decomposition efficiency of PMS . Here, we report the Fe 3+ -enhanced decomposition of PMS by a two-dimensional transition metal dichalcogenide WS 2 for pollutant degradation and E. coli disinfection. Experimental results showed that the removal rates of six representative pollutants were all above 90% under various pH conditions. Over a wide range of pH values (2–9), the removal rate of carbamazepine (CBZ) in PMS/WS 2 /Fe 3+ system almost reached 100% within 10 min, and E. coli could be inactivated by 97.3% within 1 min. WS 2 in the system accelerated the Fe 3+ /Fe 2+ cycle and participated in the activation of PMS. Electron paramagnetic resonance (EPR) measurements and scavenging experiments demonstrated that the SO 4 − and HO radicals were the main active oxidative species. The degradation pathway of CBZ was revealed based on its intermediates as determined by liquid chromatograph-mass spectrometer (LC-MS). The presence of common anions such as Cl − and HCO 3 − in PMS/WS 2 /Fe 3+ system noticeably affected the CBZ degradation. The characterization results verified the structural stability and the reusability of WS 2 . These research findings suggest that the combination of Fe 3+ and WS 2 is a promising method for PMS activation to remove organic pollutants and inactivate pathogenic bacteria during the process of wastewater treatment .
研究领域:
环境科学
·
水处理技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Deqing Zhang,Yingfei Xiong,Junye Cheng,Hassan Raza,Chuanxu Hou,Tingting Liu,Xuewei Ba,Ping Zhang,Maosheng Cao
As a novel 2D transition metal sulfide material, WS 2 has been proven to possess potential electromagnetic wave absorption (EMWA) property due to its peculiar electronic structure. However, the intrinsic weak impedance match and single dielectric loss domination of this material only produce high-frequency electromagnetic absorption (EMA), which is seemingly futile for the prevalent low-band 4G and 5G EMW. In this study, efforts have been made to effectively texture rod-like TiO 2 semiconductor with different mass ratios on the a few layers of WS 2 nanosheets via a simple step-by-step hydrothermal method. It is found that the WS 2 /TiO 2 hybrids loaded with 10% TiO 2 at a sample thickness of 5.30 mm, the minimum RL is −43.90 dB at 5.12 GHz. When the thickness of the sample is 2.00 mm, the bandwidth with RL value less than −10 dB can reach 4.70 GHz, and the effective EMA band could be adjusted in a range of 13.84 GHz (4.16–18 GHz) by increasing the thickness from 1.0 mm to 5.5 mm. It was found that the introduction of TiO 2 nanosheets with high dielectric loss into the dielectric WS 2 nanosheets can produce a synergistic effect. The benefits of such synergestic effect include, optimization of the EMA strength and bandwidth, and a reduction of the effective EMA frequency band from high frequency to low frequency. This study paves a new avenue for the future design of low-frequency EMA materials with high efficiency.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·
IF 4.084
Shanhu Liu,Yinxi Xu,Debabrata Chanda,Lei Tan,Ruimin Xing,Xiying Li,Liqun Mao,Nakata Kazuya,Akira Fujishima
Highly efficient and durable non-noble metal-based hydrogen evolution electrocatalysts are critical to advance the production of hydrogen energy via alkaline water electrolysis . Herein, we prepared a novel TiO 2 @WS 2 hybrid via a facile and scalable two-step hydrothermal strategy combined with selective etching. Benefited from acid-etched TiO 2 nanobelts with rough surface as substrate, ultrathin WS 2 nanosheets nucleated and vertically grew into few layers in the confined configuration with more exposed active edges. Furthermore, the partial incorporation of oxygen in WS 2 inherited from the remaining O–W bonds of tungsten precursor enhanced the electrical conductivity of the hybrid. Therefore, TiO 2 @WS 2 hybrid was proved to be efficient and durable electrocatalyst for hydrogen evolution in alkaline medium . Upon optimal conditions, the hybrid only required a small onset overpotential of 95 mV and a low overpotential of 142 mV at 10 mA cm −2 , superior to pristine WS 2 and TiO 2 . In addition, better cycling stability during the alkaline HER process was also obtained, indicating its capability in future practical application. The synthesis strategy presents a cost-effective approach to produce efficient WS 2 -based HER electrocatalyst for electrochemical water splitting.
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
危险品化学品经营许可证（带存储）