APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yuhang Zhu,Qiangqiang Wang,Yuhang Han,Lin Li,Maosheng Cao
CNTs, with high electrical conductivity, are considered as an excellent electromagnetic (EM) attenuation material, and have attracted the attention of countless researchers for a long time. However, there is a daunting challenge to obtain both microwave absorbing and electromagnetic interference (EMI) shielding functions in a same material. Herein, by constructing WSe 2 @CNTs heterojunction , excellent microwave absorbing and EMI shielding is obtained, which is attributed to the tunable dielectric properties. The WSe 2 @CNTs composite shows high reflection loss (RL) of −61.6 dB, broad effective absorption bandwidth (EAB) of 4.56 GHz, and efficient EMI shielding . More importantly, high green shielding index (>1) is found in the Ku band. This result confirms the WSe 2 @CNTs composite as a suitable candidate for EM bifunctional materials. Meanwhile, this strategy of constructing heterojunction provides a valuable guide for designing novel EM attenuation materials in the future.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2025
·
IF 5.1
Yingkai Liu,Lei Liu,Dafei Chen,Fan Mu,Yan Yang,Yifei Huang,Haiqiang Huang,Lujun Yang,Hui Zhang
Transition metal dichalcogenides have garnered growing attention in optoelectronic applications owing to their unique physicochemical properties and efficient carrier transport capabilities. However, their atomic-scale thickness severely limits light absorption efficiency. Herein, we fabricated a van der Waals stacked heterostructure conveniently and efficiently via transferring a CdS nanobelt onto a bilayer WSe2 nanosheet. Benefiting from the formation of a type-II band alignment between WSe2 and CdS, the CdS/WSe2 photodetector achieves a high responsivity of 643.9/1315.5 A/W and an outstanding specific detectivity of 2.89 × 1013/5.91 × 1013 Jones under weak 450 /520 nm light irradiation, respectively. Moreover, the p-n junction formed between p-type WSe2 and n-type CdS effectively suppresses dark current, leading to a 1591.5× (194.5×) enhancement in the on/off ratio compared to the pure CdS (pure WSe2 ) control devices. This work demonstrates the great potential of vdW stacked heterostructures for high-performance photodetectors and provides new insights into the development of advanced optoelectronic devices.
研究领域:
凝聚态物理
·
纳米光电子学
·
半导体器件
·
二维材料
·
光电探测技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 11
·8914-8923
·
IF 3.201
Baihong An,Yanan Liu,Chengcheng Xu,Han Wang,Jun Wan
Visible light responsive Fe3O4–WSe2/NG (nitrogen doped graphene oxide) heterojunction nanocomposites were synthesized by a hydrothermal synthesis route, in which Fe3O4 and WSe2 particles were coated on the surface of NG. The samples were characterized by XRD, SEM, TEM, XPS, VSM, UV-vis DRS, TOC, and GC-MS techniques. The results showed that the photocatalytic activity of Fe3O4–WSe2/NG photocatalysts under visible-light illumination was higher than that of WSe2/NG owing to the narrow band gap energy and delayed electron–hole recombination, and Fe3O4 can be used in advanced oxidation processes (AOPs) to degrade organic pollutants at pH 3 and 3.0 mM H2O2. Moreover, the mass fraction of Fe3O4 had a great effect on the photocatalytic activity of Fe3O4–WSe2/NG. Among the hybrid photocatalysts, 30 wt%Fe3O4–WSe2/NG (30 wt% of Fe3O4) exhibited the highest photocatalytic activity with a rate constant of 0.05589 min−1 for the degradation of MB in aqueous solution under visible light irradiation, and the removal efficiency reached 98.8% which was 1.6 times higher than that of WSe2/NG. More importantly, the magnetic properties of 30 wt%Fe3O4–WSe2/NG were analyzed and its reusability was also investigated after four successive runs by applying an external magnetic field.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2017
·Vol. 9
·期 32
·11806-11813
·
IF 7.367
T. M. Chen,X. J. Wu,J. X. Wang,G. W. Yang
As one of the transition metal dichalcogenide materials, WSe2 in the form of a few layers (nanosheets) have received much attention due to their unique physical, optical and electrical properties. Herein, we demonstrate that WSe2 nanosheets possess intrinsic enzyme mimic activity. Under acidic conditions, they exhibit pronounced peroxidase-like property. The Michaelis–Menten kinetics indicate that the catalytic activity of WSe2 nanosheets is comparable to that of horseradish peroxidase. Based on the color reaction, a platform of WSe2 nanosheets was constructed to detect glucose concentration and it showed high sensitivity and high selectivity, which means that WSe2 nanosheets with peroxidase-like property can be used to develop a highly sensitive and selective colorimetric method for glucose detection. Moreover, due to the electron-transferring and antioxidant properties of WSe2 few layers, the peroxidase-like catalysis is proposed. These findings pave the way for further application of WSe2 nanosheets in nano-biomedicine.
研究领域:
纳米医学
·
生物化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
2D Materials
·
2017
·Vol. 4
·期 2
·025097
·
IF 6.937
Yan Wang,Wu-Xing Zhou,Le Huang,Congxin Xia,Li-Ming Tang,Hui-Xiong Deng,Yongtao Li,Ke-Qiu Chen,Jingbo Li,Zhongming Wei
P–n junctions based on vertically stacked van der Waals (vdW) materials have attracted extensive attentions and may offer novel physical performances for the design of next-generation electronics. Here, vertically stacked p-WSe2/n-SnS2 heterostructures have been fabricated by a polymethyl methacrylate (PMMA)-assisted transfer method. The unique electronical properties and self-driven photoelectric characteristics of the heterostructures are measured. The transfer current of the heterostructures show gate-tunable 'anti-ambipolar' behavior under dark condition with the maximum of the on/off ratio exceeding 105, while under light illumination it triggers double 'on' state anti-ambipolar behavior. The 'anti-ambipolar' behavior under dark condition and the 'on' state I under light illumination is originating from the in series of p-channel in WSe2 and n-channel in SnS2, while the 'on' state II can be attributed to the gate-controlled Schottky barrier modulation between the heterostructure and the Au electrodes. The heterostructure also shows self-driven photoswitching performance under 532 nm laser, which can be attributed to the type-II band alignment and the build-in potential of p–n heterostructure.
研究领域:
材料科学
·
电子工程
·
光电器件
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Jing Xu,Zhengnan Wei,Shaokang Zhang,Xuanxuan Wang,Yihan Wang,Mengyuan He,Kejing Huang
Transition metal dichalcogenides (TMDs) have emerged as a promising material in the energy field due to their unique structural arrangement. In this work, ordered flower-like WSe 2 nanosheet was synthesized through simple one-step hydrothermal method , and its cathode application for rechargeable Mg-ion batteries was assessed. The WSe 2 cathode exhibits a high reversible capacity above 265 mAh g −1 at 50 mA g −1 , excellent cycling life of 90% initial capacitance that can be ceaselessly harvested for 100 cycles at 50 mA g −1 , and superior rate capability of 70% initial capacitance maintained even at the current density of 500 mA g −1 . This work paves the way for the application of WSe 2 cathode in Mg-ion and other rechargeable batteries.
研究领域:
材料科学
·
能量存储
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2018
·Vol. 165
·期 16
·A3642
·
IF 3.662
Qingzhou Wang,Yichun Wang,Xin Zhang,Gongkai Wang,Puguang Ji,Fuxing Yin
Sodium ion capacitors (SICs) represent a promising alternative of energy storage device with high energy/power densities as well as long life span. Exploration of novel anode materials with typically high rate performance is a shortcut to boost the performance of SICs. Here, we present a WSe2/reduced graphene oxide (rGO) nanocomposite synthesized by a home-made chemical vapor deposition (CVD) method. WSe2 nanoparticle is deposited uniformly at the surface of rGO nanosheets. The unique structure endows the composite with outstanding electrochemical properties. The specific capacity of 133.3 mAh g−1 at an ultrahigh current density of 60 A g−1 can be delivered. The sodium ion storage kinetics was investigated, exhibiting very high ratio of capacitive contribution during the sodium ion reaction process. The SICs based on the WSe2/rGO nanocomposite as anode show the maximum energy density of 42.8 W h kg−1 and maximum power density of 14.4 kW kg−1 as well as the superior cyclic stability, proving the promising of WSe2/rGO anode for SICs application.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Jianhong Zhang,Junjie Yan,Zhikang Ao,Wei Li,Wei Wang,Yinong Lyu,Huifang Ma
The heterostructure moiré superlattice plays a crucial role in modulating electronic and optical properties through the formation of periodic potential patterns. However, the synthesis of ultrathin 2D heterostructures remains a significant challenge. In this work, ultrathin 2D CoSe/WSe 2 heterostructures were grown via a two-step vapor deposition route. The thickness of nonlayered hexagonal CoSe nanosheets was reduced to 1.7 nm through growth on a 0.79 nm thick WSe 2 nanosheet. Raman spectroscopy analyses indicate the formation of high-quality 2D CoSe/WSe 2 heterostructures. Selected area electron diffraction studies conclusively validate the high-quality single-crystal nature of CoSe and WSe 2 nanosheets within the resultant heterostructures. Scanning transmission electron microscopy studies show that the formed heterostructure exhibits a well-defined moiré superlattice with a periodicity of ∼ 3.96 nm. Additionally, the device based on CoSe/WSe 2 heterostructures with CoSe contacts demonstrates relatively higher on-state current and field-effect mobility compared to the WSe 2 device with Cr/Au contacts. The developed synthesis method for ultrathin CoSe/WSe 2 heterostructures provides a material platform for investigating their diverse properties.
研究领域:
材料科学
·
纳米技术
·
固体物理
·
半导体器件
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Haimei Yang,Zixuan Ding,Jiayin Du,Xianlin He,Jianan Huang
Indicating and regulating intracellular redox states is crucial in interrogating their dynamic biological processes in healthy and disease states. However, this goal is subjected to dynamic changes in cellular redox. Herein, an optical invertible chiral WSe 2 QDs (L-Cys-WSe 2 QDs) for indicating and regulating the dynamic changes of intracellular redox state was developed based on ligand exchange. The L-Cys-WSe 2 QDs could respond specifically to cellular GSH with excellent anti-interference capability and high stability. This chiral probe was also applied to discriminate normal and cancerous cells on the basal of their different GSH levels. The universal application in indicating the different redox states within cells was demonstrated as well. Moreover, the as-prepared chiral WSe 2 QDs displayed good glutathione peroxidase (GPx)-like activity to regulate intracellular redox state by catalytically reducing toxic H 2 O 2 in vitro and in vivo . We anticipate that the chiroptical invertible probe should have broad applications in the dynamic analysis of the redox-based process in vivo .
研究领域:
生物化学
·
纳米医学
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2021
·
IF 7.46
Haimei Yang,Qianghong Zhao,Xian Wang,Yu Wu,Yuchen Su,Weili Wei
The monitoring of biological hypochlorous acid (HClO) in living cells is vital in clarifying its physiological functions. Generally, HClO fluorescent probes that can be used for intracellular detection are small organic molecules that require complex synthesis steps. Herein, the as-prepared WSe 2 quantum dots (QDs) without any further modification was verified to be a HClO fluorescent probe due to the unique chemical property of selenium. Compared with molecular probes, WSe 2 QDs displayed improved performance in HClO detection, such as the low limit of detection (1.1 nM), high selectivity, fast response, good aqueous solubility, friendly operation, excellent photostability, and pH-independent response. Furthermore, the most outstanding advantage of as-prepared WSe 2 QDs was their ready availability with up to the gram-large scale. WSe 2 QDs were successfully used for the detection of exogenous and endogenous HClO in living cells. Meanwhile, this probe was applied to discriminate normal cells and cancerous cells on the basal of their different HClO levels. The sensing mechanism of WSe 2 QDs to HClO was further carefully demonstrated and proposed to be HClO induced the oxidation and degradation of WSe 2 QDs into non-fluorescent products. We anticipate that the as-prepared WSe 2 QDs should have broad applications in chemical analysis and revealing the physiological function of HClO in vivo .
研究领域:
化学
·
生物学
·
材料科学
·
分析化学
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL SCIENCES
·
2023
·Vol. 39
·期 8
·1391-1403
·
IF 1.6
Zhu Leijing,Ma Jing,Jin Danli,Zhang Yongjian,Wu Siyu,Xu Ajing,Gu Yingying,An Yarui,Miao Yuqing
The abnormal concentrations of human immunoglobulin G (hIgG) refers to many kinds of diseases. Analytical methods with the characteristics of rapid response, easy operation and high sensitivity should be designed to accurately determinate the hIgG levels in human serum. In this work, a label-free electrochemical immunosensor based on WSe 2 /rGO was developed to sensitively detect human immunoglobulin G. First, the flower-like transition metal dichalcogenides (TMDCs) Tungsten Diselenide (WSe 2 ) with large effective specific surface area and porous structure was synthesized by hydrothermal synthesis. As a bio-matrix, the flower-like WSe 2 efficiently increased the active sites for loading antibodies. Meanwhile, reduced graphene oxide (rGO) obtained by tannic acid reduction was used to improve the current response of the sensing interface. WSe 2 was combined with rGO and the electrochemical active surface area (ECSA) of the sensing interface was enlarged to 2.1 times that of GCE. Finally, the combination of flower-like WSe 2 and rGO broadened the detection range and reduced the detection limit of the sensing platform. The immunosensor exhibited a high sensitivity with a wide linear range of 0.01–1000 ng/mL and low detection limit of 4.72 pg/mL. The real sample analysis of hIgG were conducted under optimal conditions, and the spiked recovery rates were between 95.5 and 104.1%. Moreover, satisfactory results were obtained by testing the stability, specificity and reproducibility of the immunosensor. Therefore, it can be concluded that the as-proposed immunosensor has the application potential of clinical analyze of hIgG in human serum. Graphical abstract
研究领域:
分析化学
·
生物传感器
·
材料科学
·
电化学
·
免疫学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 11
·1-7
·
IF 5.705
Wang Yi-Han,Xia Huan,Huang Ke-Jing,Wu Xu,Ma Ying-Ying,Deng Rui,Lu Yun-Fei,Han Zi-Wei
A sensitive aptamer/protein binding-triggered sandwich assay for thrombin is described. It is based on electrochemical-chemical-chemical redox cycling using a glassy carbon electrode (GCE) that was modified with WSe 2 and gold nanoparticles (AuNPs). The AuNPs are linked to thrombin aptamer 1 via Au-S bonds. Thrombin is first captured by aptamer 1 and then sandwiched through the simultaneous interaction with AuNPs modified with thrombin-specific aptamer 2 and signalling probe. Subsequently, the DNA-linked AuNP hybrids result in the capture of streptavidin-conjugated alkaline phosphatase onto the modified GCE through the specific affinity reaction for further signal enhancement. As a result, a linear range of 0–1 ng mL −1 and a detection limit as low as 190 fg mL −1 are accomplished. The specificity for thrombin is excellent. Conceivably, this strategy can be easily expanded to other proteins by using the appropriate aptamer.
Schematic presentation of an electrochemical biosensor for thrombin based on WSe 2 and gold nanoparticles, aptamer-thrombin-aptamer sandwiching, redox cycling, and signal enhancement by alkaline phosphatase.
研究领域:
生物化学
·
纳米技术
·
分析化学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）