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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高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 5
·期 2
·269-278
·
IF 4.872
Xiaodan Jia,Jing Bai,Zhifang Ma,Xiue Jiang
In this study, we present the synthesis and application of a new therapeutic platform based on photosensitizer-loaded, two-dimensional layered nanomaterials of WSe2 for combined photothermal and photodynamic cancer therapy. WSe2 nanosheets are synthesized by a simple and efficient chemical exfoliation using bovine serum albumin (BSA) as an effective exfoliating agent and strong stabilizing agent, endowing the WSe2–BSA nanosheets obtained with high stability in physiological solutions and good biocompatibility without further functionalization. The WSe2–BSA nanosheets can be employed not only as an efficient photothermal agent but also as a carrier to load methylene blue (MB) as a photosensitizing agent for photodynamic therapy. Moreover, the generation of singlet oxygen can be regulated by controlling the release of MB from the WSe2 nanosheets with NIR irradiation. The therapeutic efficacy of the MB-loaded WSe2–BSA (WSe2–BSA/MB) complexes was evaluated in vitro and in vivo. It was found that dual-mode photothermal and photodynamic therapy has a significant synergistic effect and dramatically improves the therapeutic efficacy toward cancer cells compared with single mode treatment. These findings indicate that WSe2 nanosheets could be a promising therapeutic agent and smart carrier for the synergistic combination of phototherapy towards biomedical applications.
研究领域:
材料科学
·
生物医学工程
·
癌症治疗
·
纳米技术
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Nano Research
·
2023
·
IF 9.9
Zhu Yuhang,Liu Tingting,Li Lin,Cao Maosheng
Currently, as the electromagnetic (EM) environment becomes increasingly complex, single-function EM materials can hardly resist the increasing electromagnetic interference (EMI), and there is an urgent need to develop multifunctional EM materials. In this work, multifunctional WSe 2 /Co 3 C was prepared by simple hydrothermal methods. Its dielectric performance and EM response were investigated. Efficient absorption, shielding performance, and energy conversion devices were customized. By tailoring the loading content, WSe 2 /Co 3 C can switch between EM absorption and EMI shielding. The maximum shielding effectiveness (SE) of WSe 2 /Co 3 C reached 36 dB, and high reflection loss (RL) of −60.28 dB and wide effective absorption bandwidth (EAB) of 6.16 GHz can be obtained at low thickness. The multiple EM attenuation mechanisms brought by the combination of two-dimensional (2D) WSe 2 and magnetic Co 3 C are considered to be the main reason for the enhanced EM attenuation ability. The WSe 2 /Co 3 C composite provides a viable candidate for developing multifunctional EM materials in 2–18 GHz.
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ACS Applied Nano Materials
·
2024
·
IF 5.3
Jiaojiao Zhou,Yuantao Liu,Xuqin Lv,Jilai Jia,Xiaoping Du,Jiangling He,Fang Xie,Zia-ud Din,Jie Cai
Ochratoxin A (OTA) poses a great threat to human health, and its rapid detection has drawn wide concerns in agri-food product risk assessment. Herein, on the basis of the aptamer-enhanced peroxidase-mimetic property of two-dimensional few-layer tungsten diselenide (WSe2) nanosheets, a simple label-free colorimetric aptasensor is presented for OTA detection. The enzymatic mimic property of the WSe2 nanosheets could be enhanced through aptamer adsorption because of the enhanced affinity of WSe2 nanosheets to 3,3′,5,5′-tetramethylbenzidine. A good linear relationship was obtained in the range from 0.5 to 50 ng/mL, and the limit of detection for OTA was 0.16 ng/mL. The performance of this strategy was comparable to previous strategies for OTA determination. Further, this colorimetric aptasensor displayed satisfying specificity and stability in a complex food matrix including both red wine and wheat flour samples. Hence, the results of this study suggest potential applications of the aptasensor to detect mycotoxins in different agri-food products.
研究领域:
分析化学
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食品科学
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纳米技术
·
毒理学
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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
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Science China-Information Sciences
·
2019
·Vol. 62
·期 12
·1-8
·
IF 2.731
Yang Huai,Xiao Mengqi,Cui Yu,Pan Longfei,Zhao Kai,Wei Zhongming
Two-dimensional (2D) ferroelectricity is considered to have significant potential for information storage in the future. Semiconducting ferroelectrics that are stable at room temperature afford many possibilities for the assembly of various high-performance heterostructures and fabricating multifuntional devices. Herein, we report the synthesis of a stable van der Waals (vdW) single-crystal semiconductor α -In 2 Se 3 . Piezoresponse force microscopy (PFM) measurements demonstrated the out-of-plane ferroelectricity in ∼15 layers α -In 2 Se 3 at room temperature. Both ferroelectric domains with opposite polarization and the tested amplitude and phase curve proved that this semiconductor exhibits hysteresis behavior during polarization. In the α -In 2 Se 3 /WSe 2 vertical heterostructure device, the switchable diode effect and nonvolatile memory phenomenon showed a high on/off ratio and a small switching voltage. The distinct resistance switches were further analyzed by band alignment of the heterostructure under different polarizations by first principle calculations. Nonvolatile memory based on vdW ferroelectric heterostructure could provide a novel platform for developing 2D room-temperature ferroelectrics in information storage.
研究领域:
材料科学
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纳米电子学
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铁电器件
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二维材料
·
非易失性存储
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Jiahui Qian,Zhen Li,Xiaomeng Guo,Yang Li,Wenchao Peng,Guoliang Zhang,Fengbao Zhang,Xiaobin Fan
Hydrogen (H2) is a clean and efficient energy carrier, and great efforts have been focused on developing new non-Pt electrocatalysts for the hydrogen evolution reaction (HER). In this study, CoP/WSe2 nanosheets hybrids were successfully prepared, and their potential as a new non-noble HER catalyst was evaluated. We found that all the hybrids showed higher catalytic activity than pure CoP and WSe2 nanosheets, suggesting their synergistic catalytic effect in the HER. Particularly, in 0.5 M H2SO4, the hybrid with an optimized CoP-to-WSe2 mass ratio of 1:1 has the highest current density of 102.9 mA/cm2 at 300 mV vs RHE and excellent long-term stability.
研究领域:
材料科学
·
电化学
·
能量转换
·
纳米技术
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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
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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
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SENSORS AND ACTUATORS A-PHYSICAL
·
2026
·
IF 5.1
Peicheng Han,Yunbo Shi,Canda Zheng,Bolun Tang,Qiaohua Feng
Green hydrothermal synthesis of flower-like WSe 2 using biodegradable ascorbic acid as the reducing agent. • Vacuum sintering at 450 ∘ C improved the crystallinity, surface activity, and charge transport of WSe 2 enhancing NO 2 sensing. • Optimal 3% Pd decoration enabled catalytic/interfacial sensitization, achieving a response of 2.26 toward 16 ppm NO 2 with good selectivity and stability. Although WSe 2 has shown great potential for NO 2 sensing, its development remains challenging because conventional hydrothermal synthesis often relies on hazardous reducing agents such as NaBH 4 and N 2 H 4 ⋅ H 2 O, which may cause rapid H 2 release, toxicity, and environmentally harmful byproducts. In addition, the sensing performance of WSe 2 is often limited by insufficient active sites and inefficient charge transfer. Herein, flower-like WSe 2 nanostructures were synthesized via a one-step hydrothermal route using benign, biodegradable, eco-friendly, and cost-effective C 6 H 8 O 6 as the reducing agent. The obtained WSe 2 was vacuum-sintered at the optimized temperature of 450 ∘ C and further decorated with Pd nanoparticles to enhance NO 2 sensing performance. The optimized 3% Pd-WSe 2 -450 ∘ C sensor exhibited a response ( R a / R g ) of 2.26 toward 16 ppm NO 2 at an operating temperature of 114 ∘ C, with response and recovery times of 20 and 190 s, respectively. The enhanced sensing performance is attributed to the synergistic effects of Pd decoration, improved crystallinity, abundant surface oxygen species, and efficient interfacial charge modulation. This work demonstrates a Pd-modified WSe 2 -based NO 2 gas sensor, where green synthesis, vacuum sintering, and interfacial Pd engineering synergistically enhance the sensing performance. Download: Download high-res image (368KB) Download: Download full-size image
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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
·
纳米生物技术
·
临床诊断
·
分子诊断
·
生物传感器
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高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 24
·2021
·
IF 4.4
Siyuan Wang,Pinyi Wang,Hailun Tang,Shilong Yu,Huihui Ye,Xinyu Fang,Jing Ding,Yang Yang,Hai Li
Two-dimensional WSe2nanosheets have received increasing attention due to their excellent optoelectronic properties. Solid precursors, such as WO3and Se powders, have been extensively employed to grow WSe2nanosheets by the chemical vapor deposition (CVD) method. However, the high melting point of WO3results in heterogeneous nucleation sites and nonuniform growth of the WSe2nanosheet. By dissolving WO3powder in a NaOH solution, we report a facile and uniform growth of monolayer and bilayer WSe2nanosheets on a SiO2/Si substrate at a large scale using liquid precursor by the CVD method. The size and thickness of the WSe2nanosheets were controlled by modulating the precursor concentration and growth temperature. The as-prepared monolayer and bilayer WSe2nanosheets were well characterized by optical microscopy, atomic force microscopy, and Raman and photoluminescence spectroscopy. With the increase in precursor concentration, the size of the monolayer WSe2increased up to 120 μm. Bilayer WSe2nanosheets were grown at higher temperatures. The photosensitivity of the bilayer WSe2was one order of magnitude higher than that of the monolayer WSe2. The carrier mobility, specific detectivity, photoresponsivity, and external quantum efficiency of the bilayer WSe2were about two orders of magnitude higher than those of the monolayer WSe2. Our method opens up a new avenue to grow monolayer and bilayer WSe2for optoelectronic applications.
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