JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 51
·期 2
·486-494
·
IF 2.047
Wang Xiaochun,Zhou Zhiwei,Lin Xuesong
In this work, we introduced two-dimensional (2D) WSe 2 with the lowest heat conductivity to enhance thermoelectric properties of the non-toxic and cost-effective SnTe. On one hand, the improved power factor can be attributed to the enhancement of Seebeck coefficient due to the decrease of low-energy carriers and minority carriers by the addition of WSe 2 -SnTe p - p -type heterojunction interface barriers. On the other hand, the thermal conductivity also decreased sharply by the heightened phonon scattering from the high-density stacking faults and multiscale hierarchical architectures. Ultimately, benefiting from the dual regulation effect of the introduction of 2D WSe 2 on the electro-acoustic decoupling, an improved figure of merit ( ZT ) of 1.0 is achieved for the composition of SnTe + 6 wt% WSe 2 at 873 K, which is enhanced by 134% in comparison with the pure SnTe sample. Moreover, the meaningful attempt represents an effective and feasible strategy for mixing SnTe with other compounds by the method of ball milling. Graphical Abstract
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2024
·
IF 8.1
Yujuan Hu,Kelin Hu,Jing Zhang,Yuxiao Jiang,Tao He,Yu He,Rujing Yan
This paper presents a hydrogen sensor made of WSe 2 modified monocrystalline SnSe 2 nanolayer . The hydrogen sensitive property of tungsten diselenide (WSe 2 ) and tin diselenide (SnSe 2 ) was found by hydrothermal adjustment of the molar ratio . The samples were characterized for their crystal structure, microstructure, morphology, and elemental composition , and the morphology and heterojunction formation of the nanocomposites were confirmed. When the optimal molar ratio is 1:1 and the optimal working temperature is 270 °C, the WSe 2 /SnSe 2 sensor have good sensing properties for hydrogen, and the sensitivity for 100 ppm hydrogen is about 7.27. Finally, the experiment proves that WSe 2 /SnSe 2 gas sensor has a unique selection of hydrogen and has a wide application prospect in hydrogen detection in the future. The gas sensing mechanism of the hydrogen sensor is discussed based on its material structure .
研究领域:
材料科学
·
传感器技术
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 6
·3715-3722
·
IF 6.895
Long Fang,Xiaoming Yuan,Kunwu Liu,Lin Li,Peng Zhou,Wei Ma,Han Huang,Jun He,Shaohua Tao
Homo-junction and multi-layer structures of transition metal chalcogenide (TMD) materials provide great flexibility for band-structure engineering and designing photoelectric devices. However, the knowledge of van der Waals epitaxy growth limits the development of these heterostructures. Herein, we employed the chemical vapor deposition (CVD) growth strategy to synthesize novel WSe2 homo-junction samples with a triangular monolayer in the center and three AA stacking bilayer flakes connected to the vertexes of the monolayer. The emitted photon energy from the bilayer near the junction showed a blueshift in energy of up to 24 meV compared with bare bilayer WSe2, confirming the charge transfer effect from monolayer to bilayer WSe2. Further growth studies revealed the shape evolution from WSe2 homo-junction to bilayer. The whole homo-junction formation and evolution process cannot be explained by the traditional layer-by-layer growth mechanism. Instead, a direct bilayer growth approach is proposed to explain the bilayer formation and evolution at the vertexes of the bottom layer of WSe2. These findings suggest that the growth of bilayer TMDs is more complex than our previous understanding. This work presents deepens insight into van der Waals epitaxy growth, and thus is valuable for guiding the fabrication of novel homo-junctions for both fundamental science and optoelectronic applications.
研究领域:
材料科学
·
光电应用
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Mairman Muska,Ye Wang,Jing Yang,Lin Ma,Qian Xu,Honghe Ding,Junfa Zhu,Qing Yang
With a dual strategy of phase-interface engineering, monolayer (1L)–1T-WSe2 integrated with Ag2Se nanoparticles (NPs) is in situ fabricated as quasi-monolayer Ag2Se/1L–1T-WSe2 hybrid nanosheets via a one-pot oleylamine-colloidal reaction. The Ag2Se NPs direct the growth of 1L–1T-WSe2 nanosheets forming the quasi-monolayer hybrid nanosheets by lodging in the interlayer spaces of WSe2 while the Ag2Se NPs being in a superionic conductor state diffuse rapidly and prevent the growth of piled-up multilayered WSe2 nanosheets. Due to the formation of quasi-monolayer Ag2Se/1L–1T-WSe2 nanosheets, many more side edges are exposed. Intensive studies illustrated that the quasi-monolayer Ag2Se/1L–1T-WSe2 hybrid nanosheets provide increased surface area and active sites as compared with isolated Ag2Se and WSe2. The hybrid nanosheets demonstrated excellent catalytic properties for hydrogen evolution reaction (HER) with overpotentials (η10) of 163 and 140 mV in acidic and basic conditions, respectively, and an outstanding alkaline supercapacitance of 1674 F g–1 at 1 A g–1. Meanwhile, X-ray photoelectron spectroscopy (XPS) and ultraviolet photoelectron spectroscopy (UPS) determinations revealed that the quasi-monolayer hybrid nanosheets with enhanced electronic modulation could promote H+ adsorption/H2 desorption and accelerate the transport and separation of charge on the interface of heterostructured catalyst along with the electrode surface so as to exhibit outstanding electrochemical performances for HER and pseudocapacitance.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 18
·3089
·
IF 5.719
Li Tan,Yiming Chen,Didi Li,Shaobin Wang,Zhimin Ao
An in situ photo-Fenton system can continuously generate H2O2by photocatalysis, activating H2O2in situ to form strong oxidizing ·OH radicals and degrading organic pollutants. A WSe2/g-C3N4composite catalyst with WSe2as a co-catalyst was successfully synthesized in this work and used for in situ photo-Fenton oxidation. The WSe2/g-C3N4composite with 7% loading of WSe2(CNW2) has H2O2production of 35.04 μmol/L, which is fourteen times higher than pure g-C3N4. The degradation efficiency of CNW2 for phenol reached 67%. By constructing an in situ Fenton-system, the phenol degradation rate could be further enhanced to 90%. WSe2can enhance the catalytic activity of CNW2 by increasing electron mobility and inhibiting the recombination of photogenerated electron–hole pairs. Moreover, the addition of Fe2+activates the generated H2O2, thus increasing the amount of strong oxidative ·OH radicals for the degradation of phenol. Overall, CNW2 is a promising novel material with a high H2O2yield and can directly degrade organic pollutants using an in situ photo-Fenton reaction.Keywords:WSe2/g-C3N4;visible light;in situ photo-Fenton;phenol degradation
研究领域:
环境科学
·
材料科学
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2017
·Vol. 34
·期 6
·1700035
·
IF 4.474
Haixia Liu,Junying Wang,Yaqi Jing,Jiang Yang,Xueting Bai,Xiaoyu Mu,Fujuan Xu,Xuhui Xue,Lingfang Liu,Yuan-Ming Sun,Qiang Liu,Haitao Dai,Changlong Liu,Xiao-Dong Zhang
High-energy ionizing radiation is widely used in medical diagnosis and cancer radiation therapy. However, high-energy radiation can also impose significant damages in healthy tissues during medical treatments via direct DNA damages and indirect damages from production of reactive oxygen species (ROS). Therefore, it is urgent to develop highly effective radioprotectants with low toxicities that can meet the increasing needs for alleviating the adverse effects from cancer radiation therapy and nuclear emergency. In this work, strongly catalytic ultrasmall (sub-5 nm) cysteine-protected WSe 2 dots are employed to protect healthy tissues against radiation via diminishing radiation-induced free radicals. The WSe 2 dots with high surface activities can recover radiation-induced DNA damages and eliminate the excessive ROS generated from radiation. In vivo experiments confirm that the survival rate of mice treated with WSe 2 dots is significantly elevated with radiation damages postponed under exposure to high-dose ionizing radiation. Furthermore, the free radicals in major organs and hematological system can be appreciably omitted, suggesting their unique role as free radical scavengers. These WSe 2 dots in ultrasmall size show rapid renal clearance of ≈74% injection dose via urine excretion in 24 h and do not cause any apparent toxicity in vivo for up to 30 d.
研究领域:
生物医学工程
·
纳米医学
·
放射生物学
✓ 已验证
DOI
高影响因子
NANO
·
2020
·
IF 1.566
Jieqiong Wang,Jie Yang,Jian Fang,Yuhang Li,Hongyuan Zhang,Zhenbo Zhao,Yuhui Ao
The WSe 2 /g-C 3 N 4 (graphite carbon nitride) composite with photocatalytic properties was synthesized using a hydrothermal method. This synthesis pathway can be characterized by being simple, inexpensive and nonpolluting, integrating the concept of green chemistry. The WSe 2 /g-C 3 N 4 composite could effectively degrade methyl orange solution under visible light irradiation. The decolorization experiment of methyl orange solution shows that the degradation rate of the 30 wt.% WSe 2 /g-C 3 N 4 composite can reach 98.7% after 100 min of illumination, while the degradation rate of pure g-C 3 N 4 was only 87.6% under the same conditions. This can be attributed to the fact that the combination of WSe 2 and g-C 3 N 4 nanosheets can increase the number of active binding sites, increasing the rate of charge separation and transport ability, decreasing the recombination rate of the photogenerated electron–hole pairs. Therefore, the WSe 2 /g-C 3 N 4 composite will have potential development as a new material with low cost, easy synthesis and excellent performance in photocatalytic degradation of water pollution.
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
Nanomaterials
·
2023
·Vol. 13
·期 8
·1368
·
IF 5.3
Zixuan Wang,Yecheng Nie,Haohui Ou,Dao Chen,Yingqian Cen,Jidong Liu,Di Wu,Guo Hong,Benxuan Li,Guichuan Xing,Wenjing Zhang
Monolayer transition metal dichalcogenides (TMDs) have drawn significant attention for their potential applications in electronics and optoelectronics. To achieve consistent electronic properties and high device yield, uniform large monolayer crystals are crucial. In this report, we describe the growth of high-quality and uniform monolayer WSe2film using chemical vapor deposition on polycrystalline Au substrates. This method allows for the fabrication of continuous large-area WSe2film with large-size domains. Additionally, a novel transfer-free method is used to fabricate field-effect transistors (FETs) based on the as-grown WSe2. The exceptional metal/semiconductor interfaces achieved through this fabrication method result in monolayer WSe2FETs with extraordinary electrical performance comparable to those with thermal deposition electrodes, with a high mobility of up to ≈62.95 cm2V−1s−1at room temperature. In addition, the as-fabricated transfer-free devices can maintain their original performance after weeks without obvious device decay. The transfer-free WSe2-based photodetectors exhibit prominent photoresponse with a high photoresponsivity of ~1.7 × 104A W−1at Vds= 1 V and Vg= −60 V and a maximum detectivity value of ~1.2 × 1013Jones. Our study presents a robust pathway for the growth of high-quality monolayer TMDs thin films and large-scale device fabrication.Keywords:chemical vapor deposition;monolayer WSe2;transfer-free;transistor;photodetector
研究领域:
材料科学
·
纳米技术
·
电子学
·
光电子学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Shiqi Song,Xiao Miao,Yanming Yang,Changqing Zhu,Guina Ren,Bo Ge
To solve the dilemma of water pollution and clean water shortage, an optimized interface evaporator was proposed, whose structure included a CeO 2 floating layer (CCF) and a WSe 2 hydrogel (WAH). The CCF loaded by superhydrophobic CeO 2 achieved a non-wetting state with a contact angle of 160.6°, and the selective adsorption of the floating oil was realized. In order to synchronously solve the dye-containing sewage discharged by textile factories, synthetic bismuth oxychloride/bismuth tungstate was deposited on the surface of CCF, and a Z-type heterostructure was determined by calculating the band structure. The WAH grown with a polyurethane sponge as the backbone had excellent hydrophilic properties, with water droplets spreading on the surface for less than 20 ms with a plastic deformation of less than 5 % after 10 cycles at a strain of 30 %. The WAH plays the function of photothermal conversion and water supply. The interface evaporator is designed for its versatility, which is suitable for desalination that requires salt suppression capacity, and is also applied to inland sewage to produce clean steam.
研究领域:
材料科学
·
环境科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-10
·
IF 3.159
Fang Long,Chen Haitao,Yuan Xiaoming,Huang Han,Chen Gen,Li Lin,Ding Junnan,He Jun,Tao Shaohua
Bottom-up epitaxy has been widely applied for transition metal dichalcogenides (TMDCs) growth. However, this method usually leads to a high density of defects in the crystal, which limits its optoelectronic performance. Here, we show the effect of growth temperature on the defect formation, optical performance, and crystal stability in monolayer WSe 2 via a combination of Raman and photoluminescence (PL) spectroscopy study. We found that the defect formation and distribution in monolayer WSe 2 are closely related to the growth temperature. These defect density and distribution can be controlled by adjusting the growth temperature. Aging experiments directly demonstrate that these defects are an active center for the decomposition process. Instead, monolayer WSe 2 grown under optimal conditions shows a strong and uniform emission dominated by neutral exciton at room temperature. The results provide an effective approach to optimize TMDCs growth.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 43
·21605-21617
·
IF 9.931
Yichun Wang,Xin Zhang,Peixun Xiong,Fuxing Yin,Yunhua Xu,Biao Wan,Qingzhou Wang,Gongkai Wang,Puguang Ji,Huiyang Gou
WSe2 onions were synthesized using a homemade chemical vapor deposition (CVD) method. The formation of a very fine particle size and spherical microstructure was attributed to the fast cooling rate and reduction of the surface energy of two-dimensional (2D) WSe2 after nucleation and growth during the synthesis process. A specific capacity of 205 mA h g−1 at 10 A g−1vs. sodium ions can be reached, representing the best sodium ion rate capability ever reported for WSe2. An exceptionally high capacitive contribution showed that fast intercalation kinetics were present, which were attributed to the intrinsic properties and the unique microstructure of WSe2. Sodium ions could be stored faster than lithium ions throughout WSe2 due to the different intercalation mechanisms, as concluded from electrochemical investigations and simulation. The sodium ion capacitors (SICs) delivered superior energy/power densities (the maximum energy density is 123.1 W h kg−1 and the maximum power density is 14.1 kW kg−1), demonstrating that WSe2 is a promising alternative for SICs that could rival lithium ion capacitors (LICs) and shedding new light on novel 2D material design of SICs with high energy/power densities.
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
·
2017
·
IF 3.133
Hongchao Li,Jianpeng Zou,Senlin Xie,Xian Leng,Di Gao,Hongzhi Yang,Xu Mao
Inexpensive graphite substrate is applied to grow WSe 2 nanofilms for catalytic application in the hydrogen evolution reaction . W nanofilms with a thickness of about 10 nm were deposited onto the graphite substrate by direct-current magnetron sputtering . The graphite with 10 nm W nanofilms was rapidly selenized at 600 °C in horizontal tube furnace to form WSe 2 nanofilms. Scanning electron microscopy, Raman spectroscopy , high-resolution transmission electron microscopy, and X-ray photoelectron spectroscopy indicated that graphite surface was covered by nano-sized vertically aligned WSe 2 platelets. The effects of the N 2 pressure in the selenization process on the HER performance have been studied in details. Turning of the selenization parameters can optimize the HER performance of the WSe 2 nanofilms, which has been evaluated via linear sweep voltammetry and Tafel slope. WSe 2 nanofilms prepared at the highest N 2 pressure of 0.08 MPa behave optimal performance. The current density reaches 10 mA cm −2 at an over potential around −189 mV vs reversible hydrogen electrode and corresponding Tafel slopes is ∼72 mV dec −1 . WSe 2 nanofilms electrodes exhibit high stability in acidic solution which shows no degradation after 10000 continuous cycles. Thus, WSe 2 nanofilms exhibit superior electrocatalytic performance which is much better than those recently reported grown on carbon paper substrate and W foil.
研究领域:
材料科学
·
电化学
✓ 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）