MICROCHIMICA ACTA
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2020
·Vol. 187
·期 11
·1-9
·
IF 6.232
Wang Yue,Fang Xi,Yin Huanshun,Zhou Yunlei,Yang Yue,Ai Shiyun
A novel photoelectrochemical immunosensor has been constructed for the determination of methylated RNA. MoS 2 nanosheets with large specific area were employed as photoactive material, gold nanoparticles were used as signal amplification unit and immobilization matrix of 4-mercaptophenylboronic acid, anti-m 6 A antibody was adopted as methylated RNA recognition reagent, and poly(U) polymerase–mediated RNA chain extension and Ru(NH 3 ) 6 3+ were used as assisted signal amplification unit. With the sensitization effect of Ru(NH 3 ) 6 3+ , the photoactivity of WS 2 nanosheets was improved greatly, which also improved the sensitivity. Using visible-light excitation and ascorbic acid as electron donor, the sensitive determination of methylated RNA was achieved by monitoring the photocurrent change with different concentrations of methylated RNA. This photoelectrochemical immunosensor has a wide linear relationship with methylated RNA concentration from 0.05 to 35 nM under optimal experimental conditions. The low detection limit of 14.5 pM was realized based on 3σ criterion. In addition to the good selectivity, this sensor also presents high reproducibility with a relative standard deviation of 1.4% for the photocurrent of seven electrodes. The applicability of the developed method was also investigated by detecting the level of methylated RNA in corn seedling leaves with and without sulfadiazine treatment.
Graphical abstract A novel photoelectrochemical immunosensor was developed for methylated RNA detection using the photoactive material of MoS2 and poly(U) polymerase–mediated RNA chain extension.
研究领域:
生物化学
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纳米技术
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分析化学
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分子生物学
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PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Xueyan Wang,Baoyu Huang,Xiaofang Wu,Ding Gu,Xiaogan Li
Two-dimensional reduced graphene oxide (rGO) nanosheets were pre-sulfonated and further incorporated by WS 2 nanoflakes to form S-rGO/WS 2 heterojunctions by hydrothermal synthesis. The sulfonation and WS 2 incorporation in S-rGO/WS 2 heterojunction have been confirmed by EDS, XPS and FTIR. The sensing performance of rGO-based chemiresistive-type sensor to ammonia at room temperature has been significantly improved by the sulfonation and incorporation of WS 2 nanoflakes. The chemiresistive sensor based on S-rGO/WS 2 exhibits enhanced response signals to 10∼50 ppm ammonia, while the response/recovery time is significantly shortened compared to rGO/WS 2 reported previously at room temperature. It benefits from both the extra introduced active acid centers sensitive to ammonia molecules and the better desorption-ability facilitated significantly by sulfonate groups (S O 3 H). The adsorption energy calculation of ammonia molecule on the sulfonated graphene sheet based on density functional theory (DFT) has been performed to illustrate the adsorption capacity of S O 3 H group. The selectivity and stability of gas sensor based on S-rGO/WS 2 have also been studied.
研究领域:
材料科学
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化学传感器
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纳米技术
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
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IF 5.532
Cuilian Wen,Jiamin Qian,Long Xiao,Lijin Luo,Junrong Zheng,Maojie Xie,Jing Tao,Xiaohong Wu,Baisheng Sa,Kai Luo
Mesoporous bioactive glasses (MBGs) are deemed as bone implants for inducing osteoblast differentiation and preventing bone resorption, however, the damage of peri-implantitis on soft and bone tissue has been generally overlooked. To overcome the significant antibacterial deficiency of MBGs, the tungsten disulfide (WS 2 ) nanosheets as near-infrared (NIR) photothermal agents have been integrated with MBG nanospheres to develop novel multifunctional WS 2 /MBG nanocomposites in this work. The results show that all the WS 2 /MBG nanocomposites exhibit mesoporous structures with larger specific surface area (up to 475.35 m 2 /g)) and more negative surface zeta potential (−17.4 mV) than MBG. Notably, the WS 2 /MBG nanocomposites can effectively promote the apatite forming ability, the proliferation and viability of MC3T3-E1 cells, as well as up-regulate the osteogenic related genes expression of Alp , Runx2 , Col1a1 , Opn and Bglap . Moreover, it is highlighted that the WS 2 /MBG nanocomposites exhibit excellent antibacterial efficacy toward S. aureus under NIR laser irradiation, with the antibacterial rate up to 96.13%. These results will offer an appealing strategy to develop multifunctional WS 2 /MBG nanocomposites with enhanced biological activity and additional antibacterial property for bone tissue engineering.
研究领域:
材料科学
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生物医学工程
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生物材料
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组织工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Peng Wang,Chengli Tang,Libing Zhang,Yebo Lu,Fengli Huang
Ammonia (NH 3 ) gas is regarded as a biomarker for clinical diagnosis of various diseases and a potential indicator for the spoilage of protein-rich foods. The acuate detection of the ammonia gas concentration depend on reliable gas sensor. In this paper, flexible room temperature ammonia gas sensor based on hierarchical Au/PANI/WS 2 ternary composite was successfully prepared by in-situ polymerization, reduction and drop-coating process. The Au/PANI/WS 2 -based ammonia sensor was tested for its room temperature sensing property including response value, response/recovery time, selectivity, and long-term stability. The effects of flexible state, humidity and operating temperature on the sensor response were also investigated. The 0D/1D/2D Au/PANI/WS 2 -based sensor showed significantly enhanced ammonia sensing property both in response and response/recovery time as compared to that of pristine WS 2 . Gas sensing mechanism of the prepared sensor was investigated by complex impedance spectroscopy and in-situ fourier transform infrared spectroscopy analysis. Besides, the sensor was proved for its practical usability in seafood spoilage detection and warning. The construction of multidimensional materials into hierarchical structure may provide an instructive way for the sensibilization of layered two-dimensional nanomaterial of WS 2.
研究领域:
材料科学
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纳米技术
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传感器技术
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食品科学
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分析化学
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产品关联
DOI
高影响因子
ChemSusChem
·
2021
·Vol. 14
·期 21
·4752-4763
·
IF 8.928
Zhiqiang Li,Wei Zhou,Yuan Tang,Xin Tan,Yizhong Zhang,Zikang Geng,Yuchen Guo,Lequan Liu,Tao Yu,Jinhua Ye
Graphical The schottky heterojunction is constructed based on the Fermi energy level difference between the metal phase 1T-WS 2 and Zn 0.5 Cd 0.5 S. Under visible light irradiation, the tight interfacial contact leads to strong electronic interactions and facilitates the transfer of photogenerated carriers from Zn 0.5 Cd 0.5 S to 1T-WS 2 , further enhancing photocatalytic hydrogen production. Due to inefficient charge separation and low surface catalytic conversion efficiencies, cocatalysts are required for achieving photocatalytic hydrogen evolution. Being a noble-metal-free cocatalyst, metallic 1T-WS 2 with excellent conductivity can function for this reaction. Herein, 1T-WS 2 /Zn 0.5 Cd 0.5 S is constructed via a simple and feasible grinding approach. The composite containing 7.5 % 1T-WS 2 in 1T-WS 2 /Zn 0.5 Cd 0.5 S achieves a hydrogen evolution rate of 61.65 mmol g −1 h −1 and an external quantum efficiency of 8.04 % at 420 nm, which is 37 times that of bare Zn 0.5 Cd 0.5 S (1.67 mmol g −1 h −1 ). The electrical conductivity of metallic 1T-WS 2 reduces the transfer impedance at the interface and thus accelerates the non-radiative energy transfer and electron transport rate. The different Fermi levels of 1T-WS 2 and Zn 0.5 Cd 0.5 S form a Schottky junction, which promotes the transfer of photogenerated electrons from Zn 0.5 Cd 0.5 S to 1T-WS 2 . More importantly, the close interface contact between 1T-WS 2 and Zn 0.5 Cd 0.5 S results in strong electron interactions, which is conducive to the spatial separation of photogenerated electrons and holes. This work will further expand the application of 1T-WS 2 in the photocatalytic hydrogen evolution process.
研究领域:
材料科学
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催化
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光催化
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能源材料
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DOI
PubMed
高影响因子
Analytical Methods
·
2024
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IF 2.7
Yunxia Yuan,Yi Di,Yuan Chen,Huichun Yu,Ruhuan Li,Songwei Yu,Fang Li,Zhaozhou Li,Yong Yin
A highly sensitive fluorescent aptasensor for carcinoembryonic antigen (CEA) was developed by employing upconversion nanoparticles (UCNPs) as an energy donor and WS2 nanosheets as an energy acceptor, respectively. Polyacrylic acid (PAA) modified NaYF4:Yb/Er UCNPs and an amine modified CEA aptamer were linked together by a covalent bond. Owing to the physical adsorption between WS2 nanosheets and the CEA aptamer, the UCNPs–aptamer was close to WS2 nanosheets, resulting in upconversion fluorescence energy transfer from UCNPs to WS2 nanosheets, and the UCNP fluorescence was quenched. With the introduction of CEA into the UCNPs–aptamer complex system, the aptamer preferentially bound to CEA resulting in a change in spatial conformation which caused UCNPs to depart from WS2 nanosheets. As a result, the energy transfer was inhibited and the fluorescence of UCNPs was observed again, and the degree of fluorescence recovery was linearly related to the concentration of CEA in a range of 0.05–10 ng mL−1 with a limit of detection of 0.008 ng mL−1. Furthermore, the aptasensor based on UCNPs and WS2 nanosheets could be competent for detecting CEA in human serum, which suggests the great application potential of the proposed aptasensor in clinical diagnosis.
研究领域:
分析化学
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生物传感器
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纳米技术
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生物医学工程
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临床诊断
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Zhongmin Geng,Qianqian Song,Xiaoming Zhang,Bing Yu,Youqing Shen,Hailin Cong
A method of introducing trifluoromethyl group (-CF 3 ) to the polymer backbone by Suzuki reaction was developed to prepare fluorinated polymers for gas separation. The CO 2 permeability increased 119% after the -CF 3 group was substituted. Tungsten disulfide (WS 2 ), a graphene-like two-dimensional material, was used for first time as an inorganic filler to prepare composite MMMs to separate CO 2 , N 2 and CH 4 . The introduction of WS 2 nanosheets increases more transport channels for gas molecules, which lead to the permeability and selectivity of MMMs obviously improved in comparison with the pristine FPPO membrane. The CO 2 /N 2 selectivity and CO 2 /CH 4 selectivity of 10 wt% WS 2 -FPPO MMMs reached a maximum about 29.6 and 39.4, respectively, with a CO 2 permeability of 472 Barrer at 10 psig and 291 K. The best performance of MMMs for CO 2 /N 2 and CO 2 /CH 4 surpasses the Robeson's upper bound line. The MMMs showed strong stability in long-term observation. The results indicated a new direction for CO 2 separation by introducing -CF 3 group to polymer and using 2D WS 2 nanosheets as nanofiller.
研究领域:
材料科学
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化学工程
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Xinxin Jiang,Ye Song,Meiling Dou,Jing Ji,Feng Wang
In this work, we fabricated MoS 2 /WS 2 heterostrucutures with decoration of Bi 2 S 3 nanorods through different stacking sequences (MoS 2 /WS 2 (bottom layer) +Bi 2 S 3 (top layer) and Bi 2 S 3 (bottom layer) + MoS 2 /WS 2 (top layer), respectively). The morphology and structure were studied by scanning electron microscope (SEM), transmission electron microscope (TEM) and the X-ray powder diffraction (XRD). It was found that the hybrid structure with different stacking sequences was composed of Bi 2 S 3 nanorods and MoS 2 /WS 2 nanosheets. By UV–visible absorption spectra (UV–vis) and photoluminescence (PL) experiments, we found that the composite catalysts of both stacking sequences can promote visible-light utilization and accelerate the electron transportation. Electrochemical measurements (such as cyclic voltammetry (CV), linear sweep voltammetry (LSV) and electrochemical impedance spectroscope (EIS) under light illumination or in dark) indicated that the MoS 2 /WS 2 +Bi 2 S 3 possessed higher photoelectrocatalytic activity towards hydrogen evolution reaction (HER) than that of Bi 2 S 3 +MoS 2 /WS 2 due to its proper energy band alignment that facilitates the effective carrier separation, the lower charge transfer resistance , higher electrochemically active surface area as well as the fast electron transfer kinetics. Inspired by these observations, we believe that MoS 2 /WS 2 +Bi 2 S 3 catalyst is a potential candidate for photoelectrocatalytic production of H 2 .
研究领域:
材料科学
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纳米技术
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电化学
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光化学
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DOI
高影响因子
Nanoscale
·
2025
·Vol. 17
·期 34
·19928-19938
·
IF 5.1
Yinghao Chen,Baihui Zhang,Shunhui Zhang,Zhikang Ao,Xiang Lan,Ruofan Yang,Jianing Xie,Wenkui Wen,Yang Du,Wentao Lv,Luyao Wang,Junjie Jin,Zhengwei Zhang,Fangping Ouyang
Two-dimensional lateral heterostructures based on transition metal dichalcogenides (TMDs) are promising for optoelectronics due to their layer thickness-dependent properties. Bilayer structures, in particular, offer advantages like enhanced electron mobility and improved stability. However, precisely controlling layer growth in these heterostructures remains a challenge. We report a simple two-step chemical vapor deposition (CVD) method for growing bilayer WS2–WSe2 and WS2–MoS2 lateral heterostructures. By strategically positioning a bilayer WS2 template to create temperature gradients, we manipulate the supersaturation of the second material, enabling precise control over the epitaxial width ratio on layer growth. Raman spectroscopy, photoluminescence (PL), and transmission electron microscopy (TEM) confirm coherent lattice continuity and chemically abrupt interfaces. The resulting WS2–WSe2 heterostructure exhibits high-performance self-powered photodetection (responsivity of 30.31 mA W−1, detectivity of 2.42 × 108 Jones and fast response time <20 ms under 638 nm laser illumination, respectively). This performance is attributed to the type-II band alignment-induced built-in electric field and the high-quality interface. This work provides novel perspectives on the growth mechanism of bilayer lateral heterostructures and highlights their potential for advanced optoelectronic applications.
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PubMed
高影响因子
APPLIED CLAY SCIENCE
·
2022
·
IF 5.907
Xinlei Xie,Yulei Wang,Ming Hao,Penji Yan,Jinsheng Liang,Dongxu Wang,Hao Li,Fei Wang
Two-dimensional tungsten disulfide (WS 2 ) nanosheets with large specific surface energies usually suffer from serious aggregation, hindering their catalytic activity and potential applications. In this work, highly dispersed WS 2 nanosheets were synthesized in a cost-effective way by employing sepiolite (Sep) nanofibers as the carrier via a hydrothermal treatment followed by calcination under H 2 /N 2 atmosphere, and the mass fraction of the raw materials including ammonium metatungstate, thioacetamide, oxalate acid and sepiolite were determined as 29.3 wt%, 35.7 wt%, 25.0 wt% and 10.0 wt%, respectively. The dispersed WS 2 nanosheets were uniformly grown on the Sep, as observed by an electron microscope . First principle calculations further revealed that the favorable bonding between the tungsten of WS 2 [W(WS 2 )] and the oxygen of Sep [O(Sep)] at the WS 2 /sepiolite interface enables Sep a unique support, superior to other minerals for growing such a highly-dispersed ultrathin WS 2 architecture. Compared with pure WS 2 , the as-prepared WS 2 /sepiolite composite exhibits about 7 times the specific surface area and 7.4 times the photocatalytic efficiency toward rhodamine B (RhB) degradation due to the better dispersion of WS 2 nanosheets and synergetic effects of sepiolite. Besides, the radical trapping experiment indicates that photo-generated hole (h + ) plays the leading role, while hydroxyl radical (·OH) and superoxide radical (·O 2 − ) act as the assistants during photocatalysis . This work provides a novel strategy for the low-cost preparation of high-quality two-dimensional materials via assembly on mineral materials.
研究领域:
材料科学
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环境科学
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高影响因子
PHYSICAL REVIEW B
·
2023
·Vol. 107
·期 8
·085304
·
IF 3.7
Weiqing Tang,Zongnan Zhang,Hao Zeng,Yaping Wu,Zhiming Wu,Xu Li,Chunmiao Zhang,Junyong Kang
Controlling over the electronic structure of two-dimensional (2D) semiconductors is crucial to unlock their full potential in the applications in future nanodevices. Here, we demonstrate a layer-dependent dielectric modulation of electronic structures in multilayer ${\mathrm{WS}}_{2}/\mathrm{GaN}$ heterostructures. The results investigated by means of in situ scanning tunneling microscopy/spectroscopy and photoluminescence spectroscopy show that the fluctuations of the dielectric environment induced by local corrugation of the GaN surface dramatically tune the band structure of monolayer ${\mathrm{WS}}_{2}$ with a large downshift of the valence band maximum by about 1.12 eV. Under the shielding effect of the first-layer ${\mathrm{WS}}_{2}$, the dielectric environment shows a weak modulation effect on the second-layer, and even has negligible influence on the third- and fourth-layer ${\mathrm{WS}}_{2}$. The relationship between dielectric environment and interfacial distance is further simulated through first-principles calculations. The electrostatic potential energy, differential charge densities, and charge transfer of the ${\mathrm{WS}}_{2}/\mathrm{GaN}$ heterostructure under different interfacial distances reveal that the differences of charge redistributions between the ${\mathrm{WS}}_{2}/\mathrm{GaN}$ interface and ${\mathrm{WS}}_{2}$ interlayer are responsible for the layer-dependent dielectric modulation. This work offers some references for the design and fabrication of novel 2D optoelectronic devices.
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高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2022
·
IF 4.804
Jiakun Wu,Haikuo Wang,Zhicai Zhang,Chao Wang,Zhiqiang Hou,Shun Wan,Dazhuan Wu,Xiaoping Ouyang
WC-cBN-MoS 2 self-lubricating ceramics were synthesized by using high pressure and high temperature sintering method. An analytical model of the self-lubricating properties has been developed to reveal the interrelationship between mechanical and self-lubricating properties. The influence of mechanical and self-lubricating properties of ceramics on the wear rate were analyzed. Self-lubricating performance optimization criterion are proposed accordingly. It was found that MoC, WS 2 can be formed during sintering, which can ensure self-lubricating and low temperature sintering properties. Adhesive wear is the main wear mechanism, the extent of which varies with the content of self-lubricating components. The high modulus of elasticity is the main reason for the excellent self-lubricating and mechanical properties of composites. The well-sintered WC-cBN-MoS 2 bulks present an excellent self-lubricating property with a hardness of 26.3 GPa and fracture toughness of 10.5 MPa·m 1/2 , which is improved at least by 52% and 46% respectively compared with the traditional self-lubricating ceramics.
研究领域:
材料科学
·
机械工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）