Advanced Photonics Nexus
·
2023
·
IF 0
Haiyang Liu,Zongnan Zhang,Yingqiu Li,Yaping Wu,Zhiming Wu,Xu Li,Chunmiao Zhang,Feiya Xu,Junyong Kang
Achieving valley pseudospin with large polarization is crucial in the implementation of quantum information applications. Transition metal dichalcogenides (TMDC) with different phase structures provide an ideal platform for valley modulation. The valley splitting has been achieved in hybrid phase WSe2, while its valley polarization remains unstudied. Magnetic field controllable valley polarization is explored in WSe2 with coexistence of H and T phases by an all-optical route. A record high valley polarization of 58.3% is acquired with a 19.9% T phase concentration under a 4-T magnetic field and nonresonant excitation. The enhanced valley polarization is dependent on the phase component and shows various increasing slopes, owing to the synergy between the T phase WSe2 and the magnetic field. The magnetic field controlled local magnetic momentums are revealed as the mechanism for the large valley polarization in H / T-WSe2. This speculation is also verified by theoretical simulations of the nonequilibrium spin density. These results display a considerable valley magnetic response in phase-engineered TMDC and provide a large-scale scheme for valley polarization applications.
研究领域:
凝聚态物理
·
材料科学
·
量子信息
·
光学调控
·
二维材料
✓ 已验证
DOI
Lubricants
·
2025
·Vol. 13
·期 2
·44
·
IF 2.9
Fulin Tu,Bin Wang,Simo Zhao,Mingrui Liu,Jiangye Zheng,Zewen Li,Chengyang Hu,Tao Jiang,Qunchao Zhang
To address the issue of high wear of polymer composites during friction, WSe2nanofillers were incorporated into the polymer matrix as a reinforcing phase to enhance heat transfer and improve the composites’ wear resistance. Tannic acid (TA) was grafted onto the surface of WSe2through high-energy ball milling, which facilitated the exfoliation of the nanofillers and improved their interfacial compatibility with the matrix material. Tribological experiments revealed that adding 5 wt% TA-WSe2reduced the friction coefficient and volumetric wear rate to 0.0065 and 8.7 × 10−4μm3/N·m, respectively, representing reductions of 98% and 94% compared to pure PEI. The TA-WSe2not only served as a reinforcing phase to enhance heat transfer but also facilitated the timely dissipation of heat generated during friction. Additionally, it formed strong interfacial bonds with both PEI and PTFE, allowing the applied load to be efficiently distributed throughout the composite material. This study offers a practical approach for the functionalization of WSe2and the development of ternary composite materials for tribological applications.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
RARE METALS
·
2023
·Vol. 42
·期 5
·1557-1569
·
IF 8.8
Liu Yan-Ru,Lei Ze-Wei,Liu Ren-Ping,Li Xin-Ye,Xiong Pei-Xun,Luo Yong-Jin,Chen Qing-Hua,Wei Ming-Deng,Zeng Ling-Xing,Qian Qing-Rong
At present, there have been some reports on the application of metal phase selenide (1T-MSe 2 ) in the field of energy storage. In this manuscript, a stable Sn-doped metal phase tungsten selenide (1T-WSe 2 -Sn) was elaborately fabricated in situ by a simple calcination technique. N-doping was introduced by employing chitosan as precursor and nanoreactor, the Sn-doping induces 1T phase of WSe 2 and enlarges the layer space to promote the electron/ion transport and structural stability. The optimized 1T-WSe 2 -Sn electrode delivers prominent cycling lifespan (285 mAh·g −1 at 1.0 A·g −1 after 900 cycles) along with decent rate capability when applied as an anode of sodium ion batteries (SIBs). The specific capacity was determined to be of 460 mAh·g −1 at 0.1 A·g −1 after 100 cycles. It also displays superior capacity of 183 mAh·g −1 at 0.5 A·g −1 for 200 cycles when paired with Na 3 V 2 (PO 4 ) 3 cathode. Applied as the anode for potassium ion batteries (PIBs), it exhibits a satisfactory specific capacity of 345 mAh·g −1 at 0.1 A·g −1 after 50 cycles. Graphical abstract
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2025
·
IF 3.8
Wang Sikai,Liu Weiping,Wang Lei,Lv Lin,Liu Xiangqin,Luo Xiaojun,Zhang Guoqi,Zhao Yan
d -Galactose (D-Gal), an essential monosaccharide, plays multiple physiological roles in living organisms. Abnormal fluctuations in its concentration are closely associated with various genetic metabolic disorders, such as galactosemia and galactose deficiency. Therefore, the development of an efficient, sensitive, and accurate method for D-Gal detection is critical for disease diagnosis and treatment. In this study, a ratiometric fluorescence-based sensing platform was constructed for the quantitative detection of D-Gal. Galactose oxidase can catalyze the oxidation of D-Gal, resulting in the generation of hydrogen peroxide (H 2 O 2 ). When combined with WSe 2 nanosheets prepared via liquid-phase exfoliation and functioning as nanozymes, in the presence of H 2 O 2 , the substrate o -phenylenediamine (OPD) undergoes oxidation to generate 2,3-diaminophenazine (DAP), which exhibits a fluorescence peak at 570 nm. Simultaneously, DAP quenches the fluorescence of carbon dots (CDs) at 430 nm via an inner filter effect, thereby enabling ratiometric detection with enhanced accuracy and sensitivity. The method exhibits a Limit of detection of 0.004 mM, Linear ranges spanning from 0.01 to 1 mM and from 1 to 300 mM, with recoveries ranging between 91.0 and 100.4%. Furthermore, the proposed method was effectively utilized for the detection of D-Gal in human serum specimens, demonstrating excellent selectivity and reliability. This research presents a novel method for D-Gal detection based on WSe 2 nanosheets and CDs, offering potential applications in the biomedical and biosensing fields. Graphical abstract
研究领域:
生物分析化学
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纳米生物技术
·
临床诊断
·
分子诊断
·
生物传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2019
·Vol. 6
·期 6
·1382-1387
·
IF 5.934
Yuanmeng Zhao,Guixiang Mao,Chaozhang Huang,Ping Cai,Gongzhen Cheng,Wei Luo
Searching for highly efficient and stable electrocatalysts applied for the hydrogen evolution reaction (HER) in an alkaline solution is highly desirable, but still remains a challenge due to the sluggish water dissociation kinetics. Herein, in this work, ultrafine Ru nanoparticle (NP) decorated WSe2 nanosheets have been successfully prepared by a colloidal synthetic approach. Benefiting from the interfacial synergy effect between WSe2 nanosheets and Ru NPs, the rate-determining water dissociation step for the alkaline HER and the subsequent hydrogen generation step are speeded up. As expected, the resultant Ru–WSe2 hybrid with 1.93 wt% Ru loading exhibits excellent catalytic performance for HER media, with an overpotential of 87 mV to achieve a current density of 10 mA cm−2, and superior long-term stability.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jun Wan,Baihong An,Zhibeng Chen,Jingwei Zhang,William W. Yu
Nitrogen doped graphene oxide (NG) modified WSe 2 nanorod composites (WSe 2 /NG) were prepared by a hydrothermal synthesis route. The synthesized samples were characterized by scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), transmission electron microscopy (TEM), UV–vis diffuse reflectance spectroscopy(DRS) and elemental analysis . Using methylene blue (MB) as a target organic dye, WSe 2 /NG nanocomposites exhibited significant enhancement in photocatalytic degradation of MB under visible light irradiation compared with WSe 2 . That was mainly attributed to the strong adsorption of MB, excellent electrical conductivity and charge separation features of the NG, leading to effectively restrained electron-hole pair recombination of WSe 2 nanorods. Among the hybrid photocatalysts , WSe 2 /50NG (50 wt% of NG) exhibited the highest photocatalytic activity with a rate constant of 0.0572 min −1 for the degradation of the MB in aqueous solution under visible light irradiation, and the removal efficiency reached 99.3% which was 2.4 times higher than that of WSe 2 . In addition, WSe 2 /NG also showed higher stability and good reusability.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2016
·
IF 3.15
Hongchao Li,Di Gao,Kun Li,Mengde Pang,Senlin Xie,Rutie Liu,Jianpeng Zou
The tungsten diselenide (WSe 2 ) films with different orientation present unique properties suitable for specific applications, such as WSe 2 with a C-axis⊥substrate for optoelectronics and WSe 2 with a C-axis // substrate for electrocatalysts. Orientation control of WSe 2 is essential for realizing the practical applications. In this letter, a WSe 2 film has been prepared via rapid selenization of a magnetron-sputtered tungsten (W) film. The influence of the magnetron-sputtered W film on WSe 2 film growth was studied systematically. Scanning electron microscopy, X-ray diffractometry and high-resolution transmission electron microscopy were used to evaluate the morphology, microstructure and phase composition of the W and WSe 2 films. The substrate temperature has a significant effect on the W film phase composition, but little effect on the WSe 2 film orientation. The WSe 2 orientation can be controlled by changing the W film microstructure. A dense W film that is deposited at low pressure is conducive to the formation of WSe 2 with a C-axis⊥substrate, whereas a porous W film deposited at high pressure favors the formation of WSe 2 with a C-axis // substrate. A growth model for the WSe 2 film with different texture has been proposed based on the experimental results. The direction of selenium (Se) vapor diffusion differs at the top and side surfaces. This is a key factor for the preparation of anisotropic WSe 2 films. Highly oriented WSe 2 films with a C-axis⊥substrate grow from the dense W film deposited at low pressure because Se vapor can only diffuse into the W film from the top surface where it is converted into selenide. Highly oriented WSe 2 with a C-axis // substrate can be achieved for the porous W film that is deposited at high pressure because the nanopores provide a fast transmission tunnel for Se vapor diffusion. These findings will contribute to the controlled fabrication of WSe 2 film and provide a theoretical basis for its application.
研究领域:
材料科学
·
无机非金属材料
·
薄膜制备
·
纳米材料
·
表面科学
·
半导体材料
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Rensong Guo,Yutong Han,Chen Su,Xinwei Chen,Min Zeng,Nantao Hu,Yanjie Su,Zhihua Zhou,Hao Wei,Zhi Yang
Semiconducting two-dimensional (2D) transition metal dichalcogenides (TMDs) are promising gas-sensing materials due to their large surface-to-volume ratio, layered structures, susceptible surfaces, and excellent conductivities. Herein, a simple and effective method has been developed to exfoliate tungsten diselenide (WSe 2 ) into few-layered nanosheets with N- methyl-2-pyrrolidone (NMP) as a dispersant. The gas sensor based on the as-synthesized WSe 2 nanosheets shows an extremely high response (50 ppb, 5.06) under a low detection concentration of nitrogen dioxide (NO 2 ) at room temperature (25 °C), which is much higher than many other reports for 2D TMDs-based gas sensors. Additionally, our sensor also exhibits a response of 11.01 to 10 ppm NO 2 , an excellent selectivity, and a reliable long-term stability within 8 weeks. It is expected that the outstanding performances of the gas sensors based on WSe 2 nanosheets reported in the present work will make WSe 2 a promising candidate for ultrasensitive NO 2 sensing applications.
研究领域:
材料科学
·
纳米科技
·
传感器技术
·
表面化学
·
环境监测
✓ 已验证
DOI
高影响因子
Advanced Science
·
2021
·Vol. 8
·期 6
·2003387
·
IF 16.806
Tie Chang,Oyawale Adetunji Moses,Conghui Tian,Hai Wang,Li Song,Gang Zhao
Despite recent advances in controlling ice formation and growth, it remains a challenge to design anti-icing materials in various fields from atmospheric to biological cryopreservation. Herein, tungsten diselenide (WSe 2 )-polyvinyl pyrrolidone (PVP) nanoparticles (NPs) are synthesized through one-step solvothermal route. The WSe 2 -PVP NPs show synergetic ice regulation ability both in the freezing and thawing processes. Molecularly speaking, PVP containing amides group can form hydrogen bonds with water molecules. At a macro level, the WSe 2 -PVP NPs show adsorption-inhibition and photothermal conversation effects to synergistically restrict ice growth. Meanwhile, WSe 2 -PVP NPs are for the first time used for the cryopreservation of human umbilical vein endothelial cell (HUVEC)-laden constructs based on rapid freezing with low concentrations of cryoprotectants (CPAs), the experimental results indicate that a minimal concentration (0.5 mg mL −1 ) of WSe 2 -PVP NPs can increase the viabilities of HUVECs in the constructs post cryopreservation (from 55.8% to 83.4%) and the cryopreserved constructs can also keep good condition in vivo within 7 days. Therefore, this work provides a novel strategy to synergistically suppress the formation and growth of the ice crystalsfor the cryopreservation of cells, tissues, or organs.
研究领域:
材料科学
·
生物技术
·
低温生物学
✓ 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
ANALYST
·
2017
·Vol. 142
·期 24
·4843-4851
·
IF 3.885
Ying-Xu Chen,Wen-Jing Zhang,Ke-Jing Huang,Mingbo Zheng,Ya-Cen Mao
In this work, we report an ultrasensitive electrochemical biosensor for microRNA-21 (miRNA-21) detection by using a competitive RNA–RNA hybridization configuration. A biotinylated miRNA of the self-same sequence with the target miRNA is mixed with the samples, and allowed competition with the target miRNA for a thiolated RNA probe immobilized onto a tungsten diselenide (WSe2) nanosheet modified electrode. Thereafter the current response is obtained by forming the hybridized biotinylated miRNA with streptavidin–horseradish peroxidase (HRP) conjugates to catalyze the H2O2 + hydroquinone (HQ) system. Benefiting from the high specific surface area of WSe2 nanosheets, the competitive hybridization configuration and the signal amplification of the H2O2 + HQ detection system, the proposed assay exhibits a wide linear range of 0.0001–100 pM towards target miRNA with a detection limit of 0.06 fM (S/N = 3), and shows excellent discrimination ability for base-mismatched miRNA sequences. Therefore, the designed platform has promising prospects for the detection of miRNA in biomedical research and early clinical diagnosis.
研究领域:
生物化学
·
纳米技术
·
生物医学工程
·
分子诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 29
·2400712
·
IF 18.5
Haoran Zeng,Huihui Yu,Baishan Liu,Shucao Lu,Xiaofu Wei,Li Gao,Mengyu Hong,Xiankun Zhang,Zheng Zhang,Yue Zhang
Maximizing light-to-electricity conversion efficiency is a crucial challenge for the practical applications of 2D material photodetectors. However, due to the lack of stable and precise electronic structure control methods for 2D materials, the driving force of photogenerated carriers is insufficient that severely hinders the efficiency of separation and transport. Herein, a gradient-modulated, stable and precise strain applied strategy for 2D materials is designed and constructed, which results in a significant improvement in the detect efficiency of ZnO/WSe 2 /graphene van der Waals heterojunction photodetectors. Different from the overall strain of all-component materials in typical photodetectors, biaxial tensile strain is applied to WSe 2 that can be precisely modulated by controlling the height of ZnO nanorods, while the strain is nearly unaffected to ZnO. As the strain modulation increases from 1.3% to 4.0%, the external quantum efficiency ( EQE ) of the heterojunction increases from 11.4% to 35.3%, representing a threefold increase. Furthermore, with increasing strain, the EQE can reach higher levels. Moreover, the strain-enhanced conversion efficiency mechanism is elucidated that results from the synergistic effect of the strain-induced WSe 2 exciton convergence and the strain-increased ZnO/WSe 2 interface barrier, which enhances the carrier interface separation efficiency.
研究领域:
纳米电子学
·
光子学
·
二维材料
·
光电子学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）