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Energy Transfer Dynamics between Carbon Quantum Dots and Molybdenum Disulfide Revealed by Transient Absorption Spectroscopy
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作者 Ruixiang Wu Xin Liu +4 位作者 Xiaoshuai Wang Jingjing Luo Bin Li Shengzhi Wang Xiangyang Miao 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2023年第5期503-508,I0001,共7页
Zero-dimensional environmentally friendly carbon quantum dots(CQDs)combined with two-di-mensional materials have a wide range of applications in optoelec-tronic devices.We combined steady-state and transient absorp-ti... Zero-dimensional environmentally friendly carbon quantum dots(CQDs)combined with two-di-mensional materials have a wide range of applications in optoelec-tronic devices.We combined steady-state and transient absorp-tion spectroscopies to study the energy transfer dynamics between CQDs and molybdenum disulfide(MoS_(2)).Transient absorption plots showed photoinduced absorption and stimulated emission features,which involved the intrinsic and defect states of CQDs.Adding MoS_(2)to CQDs solution,the lowest unoccupied molecular orbital of CQDs transferred energy to MoS_(2),which quenched the intrinsic emission at 390 nm.With addition of MoS_(2),CQD-MoS_(2)composites quenched defect emission at 490 nm and upward absorption,which originated from another energy transfer from the defect state.Two energy transfer paths between CQDs and MoS_(2)were efficiently manipulated by changing the concentration of MoS_(2),which laid a foundation for improving device performance. 展开更多
关键词 Energy transfer Transient absorption spectroscopy Carbon quantum dot molybdenum disulfide
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Properties of a MOS Device on Single Layer Molybdenum Disulfide
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作者 Ravi Kumar Chanana 《材料科学与工程(中英文A版)》 2023年第1期26-29,共4页
The properties of a metal-oxide-semiconductor device on a single layer MoS_(2)(molybdenum disulfide)semiconductor are determined theoretically utilizing the concept of physics that the carrier effective masses in mate... The properties of a metal-oxide-semiconductor device on a single layer MoS_(2)(molybdenum disulfide)semiconductor are determined theoretically utilizing the concept of physics that the carrier effective masses in materials are related to the intrinsic Fermi energy levels in materials by the universal mass-energy equivalence equation given as dE/E=dm/m,where E is the energy and m is the mass of the free electron.The known parameters of electron effective mass of 0.48 m and the direct bandgap of 1.8 eV for monolayer MoS_(2) semiconductor are utilized to determine the properties of the MOS(metal-oxide-semiconductor)device,with the given previous research consequence that the threshold for electron heating in SiO_(2) is 2 MV/cm-eV. 展开更多
关键词 molybdenum disulfide mass-energy equivalence MOS device Fowler-Nordheim tunnelling
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Hydrothermal Synthesis of Molybdenum Disulfide for Lithium Ion Battery Applications 被引量:11
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作者 WANG Shiquan LI Guohua +4 位作者 DU Guodong JIANG Xueya FENG Chuanqi GUO Zaiping KIM Seung-Joo 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第6期910-913,共4页
Molybdenum disulfide nanoflakes were synthesized by a simple hydrothermal process using sodium molybdate and thiourea as reactants at a relatively low temperature. X-ray diffraction(XRD) and transmission elec-tron mic... Molybdenum disulfide nanoflakes were synthesized by a simple hydrothermal process using sodium molybdate and thiourea as reactants at a relatively low temperature. X-ray diffraction(XRD) and transmission elec-tron microscopy(TEM) indicate that the samples have the structure of 2H-MoS2 and the morphology of nanoflakes with the average thickness around 5-10 nm. The results of electrochemical properties indicate that the morphology and size of MoS2 particles have effects on their capacity when they are used as the anode for lithium ion battery. The as-prepared MoS2 samples have high reversible discharge capacity up to 994.6 mA·h·g-1 for the MoS2-1 elec-trode and 930.1 mA·h·g-1 for the MoS2-2 electrode and show excellent cycling performances. The MoS2-1 electrode has a better cycling stability than the MoS2-2 electrode due to their difference in the uniformity of the samples. 展开更多
关键词 molybdenum disulfide chemical synthesis electrochemical property electrode material
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Developing polydopamine modified molybdenum disulfide/epoxy resin powder coatings with enhanced anticorrosion performance and wear resistance on magnesium lithium alloys 被引量:4
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作者 Shibo Chen Changqing Yin +8 位作者 Yi Wang Shuang Yi Xiang Gao Xujuan Zhang Qiyu Liao Yuxin Zhang Xia Zhao Jinsong Rao Baorong Hou 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2022年第9期2534-2545,共12页
Epoxy resin powder coating has been successfully applied on the corrosion protection of magnesium lithium alloys.However,poor wear resistance and microcracks formed during the solidification have limited it extensive ... Epoxy resin powder coating has been successfully applied on the corrosion protection of magnesium lithium alloys.However,poor wear resistance and microcracks formed during the solidification have limited it extensive application.There are limited approaches to exploit such anti-corrosion and mechanical properties of magnesium lithium alloys.Herein,the epoxy resin powder coating with polydopamine modified molybdenum disulfide(MoS_(2)@PDA-EP powder coating with 0,0.1,0.2,0.5,1.0 wt.%loading)was well prepared by melt extrusion to investigate its anticorrosion performance and wear resistance.The results revealed that the addition of MoS_(2)@PDA enhanced the adhesion strength between coatings and alloys,wear resistance and corrosion protection of the powder coatings.Among them,the optimum was obtained by 0.2 wt.%MoS_(2)@PDA-EP powder coating which could be attributed to well dispersion and efficient adhesion with coating matrix.To conclude,MoS_(2)@PDA-EP powder coating is meaningfully beneficial for the anticorrosive and wear performance improvement of magnesium lithium alloys. 展开更多
关键词 Magnesium lithium alloys Epoxy resin powder coating molybdenum disulfide POLYDOPAMINE Anticorrosion performance Wear resistance
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Molybdenum disulfide(MoS2)-based electrocatalysts for hydrogen evolution reaction:From mechanism to manipulation 被引量:3
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作者 Yao Xu Riyue Ge +7 位作者 Jack Yang Jiancheng Li Sean Li Ying Li Jiujun Zhang Jing Feng Bin Liu Wenxian Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第11期45-71,I0003,共28页
Molybdenum disulfide(MoS_(2))-based materials as the non-noble metal catalysts have displayed the potential capability to drive electrocatalytic hydrogen evolution reaction(HER)for green hydrogen production along with... Molybdenum disulfide(MoS_(2))-based materials as the non-noble metal catalysts have displayed the potential capability to drive electrocatalytic hydrogen evolution reaction(HER)for green hydrogen production along with their intrinsic activity,tunable electronic properties,low cost,and abundance reserves,which have attracted intensive attention as alternatives to the low-abundance and high-cost platinum-based catalysts.However,their insufficient catalytic HER activities and stability are the major challenges for them to become practically applicable.Hereby,the MoS_(2)-based electrocatalysts for HER are comprehensively reviewed to explain the fundamental science behind the manipulations of the crystal structure,microstructure,surface,and interface of MoS_(2) in order to enhance its catalytic performance through changing the electrical conductivity,the number of active sites,surface wettability,and the Gibbs free energy for hydrogen adsorption(ΔGH).Recent studies in surface/interface engineering,such as phase engineering,defect engineering,morphology design,and heterostructure construction,are analyzed to reveal the state-of-the-art strategies for designing and preparing the cost-effective and highperformance MoS_(2)-based catalysts through optimizing the charge transfer,surface-active sites,ΔGH,and surface hydrophilicity.Lastly,the perspectives,challenges,and future research directions of HER electrocatalysis are also given to facilitate the further research and development of HER catalysts. 展开更多
关键词 Surface/interface engineering Hydrogen evolution reaction molybdenum disulfide MECHANISMS
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Hierarchical molybdenum disulfide nanosheet arrays stemmed from nickel-cobalt layered double hydroxide/carbon cloth for highly-efficient hydrogen evolution reaction 被引量:3
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作者 Yuxuan Wei Yanlong Lv +1 位作者 Beidou Guo Jianru Gong 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第6期587-592,I0014,共7页
The hierarchical structure of molybdenum disulfide(MoS2)nanosheet arrays stemmed from nickelcobalt layered double hydroxide(NiCo-LDH)/carbon cloth was prepared by growing the MoS_(2) nanosheet arrays onto the NiCo-LDH... The hierarchical structure of molybdenum disulfide(MoS2)nanosheet arrays stemmed from nickelcobalt layered double hydroxide(NiCo-LDH)/carbon cloth was prepared by growing the MoS_(2) nanosheet arrays onto the NiCo-LDH template which was pre-deposited onto the carbon cloth substrate.In this electrode configuration,carbon cloth is the three dimensional and conductive skeleton;NiCo-LDH nanosheets,as the template,ensure the oriented growth of MoS2 nanosheet arrays.Therefore,more MoS_(2) active sites are exposed and the catalyst exhibits good hydrogen evolution reaction activity. 展开更多
关键词 Hydrogen evolution reaction catalysts Hierarchical structure molybdenum disulfide Nickel-cobalt layered double hydroxide
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Strong interactions in molybdenum disulfide heterostructures boosting the catalytic performance of water splitting: A short review 被引量:1
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作者 Bo Shang Lin Jiao +2 位作者 Qiaoliang Bao Changming Li Xiaoqiang Cui 《Nano Materials Science》 CAS 2019年第4期231-245,共15页
Two-dimensional materials(2DMs) have attracted substantial attention due to their abundant active sites and their ultrahigh surface area for different catalytic applications due to the high lateral-longitudinal ratio.... Two-dimensional materials(2DMs) have attracted substantial attention due to their abundant active sites and their ultrahigh surface area for different catalytic applications due to the high lateral-longitudinal ratio. Transition metal dichalcogenides(TMDs), especially MoS2, as one of the 2DMs most often studied, have shown superior activity in electrochemical applications. Recently, combinations of different 2DMs have been widely studied, and they appear to be the most promising strategy available to develop state of the art catalysts for different reactions.In this article, we review the interactions between MoS2 and other materials as well as the novel assembly induced phase transitions of TMDs and their underlying mechanisms. Several methods for inducing the phase transition of TMDs by building MoS2-based heterostructures have been introduced. The electronic coupling between these counterparts has significantly enhanced their conductivity and optimized the energy states of the materials, thus introducing enhanced activity as compared to their original counterparts. The ideas summarized in this article may shed new light on and help to develop next-generation green energy materials by designing and constructing highly active two-dimensional catalysts for efficient water splitting. 展开更多
关键词 molybdenum disulfide HETEROSTRUCTURE Phase transition Interaction Water splitting
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Tunable terahertz acoustic-phonon emission from monolayer molybdenum disulfide
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作者 Cheng-Xiang Zhao Miao-Miao Zheng +1 位作者 Yuan Qie Fang-Wei Han 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第12期470-475,共6页
The acoustic-phonon emission from monolayer molybdenum disulfide(ML-MoS_(2))driven by a direct-current electric field is studied theoretically using the Boltzmann equation method.It is found that the Cerenkov emission... The acoustic-phonon emission from monolayer molybdenum disulfide(ML-MoS_(2))driven by a direct-current electric field is studied theoretically using the Boltzmann equation method.It is found that the Cerenkov emission of terahertz acoustic-phonons can be generated when a very weak electric field is applied to ML-MoS_(2).The physical mechanisms of acoustic-phonon emission are analyzed from the perspective of condensed matter physics.The acoustic-phonon emission from ML-MoS_(2)is also compared with those from graphene and GaAs.The results reveal that the frequencies of acousticphonons generated by ML-MoS_(2)are between the frequencies of those generated from GaAs and graphene.The results of this work suggest that the ML-MoS_(2)can make up for graphene and GaAs in respect of acoustic-phonon emission and be used in tunable hypersonic devices such as terahertz sound sources. 展开更多
关键词 acoustic-phonon emission TERAHERTZ monolayer molybdenum disulfide
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Enhanced activation of peroxymonosulfate on layered molybdenum disulfide loaded with Co-La bimetallic oxide for efficient degradation of chloramphenicol
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作者 Yu-Ning Fan Yun-Qiu Zhang +6 位作者 San-Shuang Gao Zeng-Hui Bi Yin Wang Shu-Xing Zhou Qian Liu Tian-Ping Lv Guang-Zhi Hu 《Rare Metals》 SCIE EI CAS CSCD 2024年第9期4628-4635,共8页
The use of transition metal-activated peroxymonosulfate(PMS)as an advanced oxidation technology has gained recognition.This study developed a catalyst using cobaltDlanthanum bimetallic oxide supported on layered molyb... The use of transition metal-activated peroxymonosulfate(PMS)as an advanced oxidation technology has gained recognition.This study developed a catalyst using cobaltDlanthanum bimetallic oxide supported on layered molybdenum disulfide(Mo S_(2))as a carrier.The CoDLa/Mo S_(2)catalyst was synthesised through coprecipitation,followed by calcination with an optimised metal ratio of Co:La=2:1 to activate PMS and degrade trace chloramphenicol(CAP)in water.The chemical composition of the catalyst was confirmed using X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).At catalyst and PMS dosages of 0.1 and 0.5 g·L^(-1),respectively,the degradation rate of CAP was 95%with in 30 min.The catalyst exhibitedstrong resistance to most interfering anions and maintained a high degradation rate at p H 3D11.Liquid chromatographyDmass spectrometry analysis revealed the potential degradation pathways of CAP in the CoDLa/Mo S_(2)(2:1)/PMS system.For other pollutants,such as oxytetracycline,complete degradation was achieved within 20 min,demonstrating the broad applicability of the CoDLa/Mo S_(2)(2:1)/PMS system for the degradation and removal of antibiotic organic contaminants. 展开更多
关键词 catalyst molybdenum disulfide
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Self-dispersed molybdenum disulfide quantum dot/graphene crumpled ball as efficient high temperature lubricant additive
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作者 Guiru DU Yujuan ZHANG +3 位作者 Shuguang FAN Ningning SONG Shengmao ZHANG Pingyu ZHANG 《Friction》 SCIE EI CAS CSCD 2024年第8期1771-1784,共14页
Inorganic nanoparticles have been proved as powerful lubricant additives at elevated temperature.However,the tribological properties are inevitably impaired due to poor dispersion and insufficient high temperature res... Inorganic nanoparticles have been proved as powerful lubricant additives at elevated temperature.However,the tribological properties are inevitably impaired due to poor dispersion and insufficient high temperature resistance of organic matter modified nanoparticles.Here,we prepare a self-dispersed molybdenum disulfide quantum dot/graphene crumpled ball(MGCB)comprising molybdenum disulfide quantum dot uniformly interspersed on the wrinkled graphene ball.The crumpled ball composite possesses excellent dispersity in polyalkylene glycol base oil without depending on surface modifiers.Compared with the conventional phosphate esters lubricant,our results indicate MGCB could vastly improve the lubrication performance of polyalkylene glycol with an extremely low concentration(0.05 wt%)at elevated temperature(150°C),showing a friction reduction of 47%and a wear reduction of 30%compared with the conventional phosphate esters lubricant(tricresyl phosphate,TCP).This is because crumpled ball potentiates synergistic lubrication effect within the boundary lubrication.Overall,we envision our designed self-dispersed MGCB has significant potential in tribological application at elevated temperature. 展开更多
关键词 self-dispersed crumpled ball GRAPHENE molybdenum disulfide quantum dot high temperature tribological properties
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Advanced 2D molybdenum disulfide for green hydrogen production: Recent progress and future perspectives
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作者 Meng FANG Yuqin PENG +8 位作者 Puwei WU Huan WANG Lixin XING Ning WANG Chunmei TANG Ling MENG Yuekuan ZHOU Lei DU Siyu YE 《Frontiers in Energy》 SCIE EI CSCD 2024年第3期308-329,共22页
The development of renewable and affordable energy is crucial for building a sustainable society. In this context, establishing a sustainable infrastructure for renewable energy requires the integration of energy stor... The development of renewable and affordable energy is crucial for building a sustainable society. In this context, establishing a sustainable infrastructure for renewable energy requires the integration of energy storage, specifically use of renewable hydrogen. The hydrogen evolution reaction (HER) of electrochemical water splitting is a promising method for producing green hydrogen. Recently, two-dimensional nanomaterials have shown great promise in promoting the HER in terms of both fundamental research and practical applications due to their high specific surface areas and tunable electronic properties. Among them, molybdenum disulfide (MoS2), a non-noble metal catalyst, has emerged as a promising alternative to replace expensive platinum-based catalysts for the HER because MoS_(2)has a high inherent activity, low cost, and abundant reserves. At present, greatly improved activity and stability are urgently needed for MoS_(2)to enable wide deployment of water electrolysis devices. In this regard, efficient strategies for precisely modifying MoS_(2)are of interest. Herein, the progress made with MoS_(2)as an HER catalyst is reviewed, with a focus on modification strategies, including phase engineering, morphology design, defect engineering, heteroatom doping, and heterostructure construction. It is believed that these strategies will be helpful in designing and developing high-performance and low-cost MoS2-based catalysts by lowering the charge transfer barrier, increasing the active site density, and optimizing the surface hydrophilicity. In addition, the challenges of MoS_(2)electrocatalysts and perspectives for future research and development of these catalysts are discussed. 展开更多
关键词 molybdenum disulfide(MoS_(2)) hydrogen evolution reaction(HER) active site ELECTROCATALYST modification strategie
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二硫化钼自润滑涂层性能及制备工艺的研究进展
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作者 于凯 王静静 +4 位作者 刘平 马迅 张柯 马凤仓 李伟 《材料导报》 EI CAS CSCD 北大核心 2024年第7期46-55,共10页
MoS_(2)是过渡族金属二硫化物中的一员,其涂层材料因独特的层状结构而表现出优异的摩擦学性能。MoS_(2)自润滑涂层在刀具以及空间部件材料的表面减磨和保护上发挥着重要作用,但是MoS_(2)涂层对湿度的敏感性、附着力差以及耐磨寿命有限... MoS_(2)是过渡族金属二硫化物中的一员,其涂层材料因独特的层状结构而表现出优异的摩擦学性能。MoS_(2)自润滑涂层在刀具以及空间部件材料的表面减磨和保护上发挥着重要作用,但是MoS_(2)涂层对湿度的敏感性、附着力差以及耐磨寿命有限等问题限制了其应用。国内外学者在MoS_(2)涂层的摩擦学研究上做了大量工作,目前的研究重点主要是不同温度、湿度、气体介质的多环境下的摩擦学行为分析,以及通过纳米多层体系的设计实现对晶体结构的可控。本文概述了2010年以来有关MoS_(2)自润滑涂层材料的研究进展,主要综述了MoS_(2)自润滑涂层的摩擦学性能以及不同元素掺杂对其性能和结构的影响。总结了MoS_(2)涂层的组成结构、性能、制备工艺,并对其在表面润滑领域的研究和应用前景进行了展望。本文对MoS_(2)自润滑涂层的研究和工程应用具有参考意义。 展开更多
关键词 二硫化钼自润滑涂层 摩擦学性能 微观结构 制备工艺 元素掺杂
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改性碳纤维-MoS_(2)复合涂层的高温摩擦学性能研究
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作者 高阳 刘思思 +2 位作者 廖君慧 赵鼎元 刘金刚 《摩擦学学报(中英文)》 EI CAS CSCD 北大核心 2024年第4期482-493,共12页
为了改善高温下固体润滑复合涂层的稳定性,选择经过化学改性的纳米碳纤维对MoS_(2)涂料进行性能优化,制备添加不同比例的改性粉末的涂料.通过对粉末进行XPS、红外和形貌分析,表明碳纤维已经改性.借助CFT-I型高速往复摩擦磨损试验机分别... 为了改善高温下固体润滑复合涂层的稳定性,选择经过化学改性的纳米碳纤维对MoS_(2)涂料进行性能优化,制备添加不同比例的改性粉末的涂料.通过对粉末进行XPS、红外和形貌分析,表明碳纤维已经改性.借助CFT-I型高速往复摩擦磨损试验机分别在不同温度条件下进行摩擦试验,利用超景深显微系统对不同条件涂层表面磨损的形貌进行观测,对磨损机理进行分析,探究添加量的最优比例.试验结果表明:在试验温度分别为20、50和100℃时,添加质量分数1.5%CF-GO(氧化石墨烯改性碳纤维)涂料制备的涂层耐磨性能均优于其他的添加比例的涂层.在干摩擦5 N载荷,试验温度为200℃时,添加质量分数1.5%CF-GO的涂层比未改性的涂层的磨痕深度、宽度分别减少66.1%、29.2%,涂层的耐磨性能有了很大的提高,进一步采用扫描电子显微镜(SEM)分析涂层的内部形貌可知,添加质量分数1.5%的CF-GO时,涂层内部形成清晰的网状结构,从而使得该比例下的涂层同时具有抗高温变形、耐磨以及耐热等优异的性能. 展开更多
关键词 改性碳纤维 二硫化钼 复合涂层 高温变形 摩擦学性能
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空间滚动轴承MoS_(2)薄膜润滑分子动力学模拟
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作者 董绍江 程伟伦 +1 位作者 汤宝平 胡小林 《重庆大学学报》 CAS CSCD 北大核心 2024年第7期43-52,共10页
针对空间滚动轴承往复运动状态下二硫化钼薄膜润滑失效机理不明的难题,提出了采用分子动力学对薄膜润滑过程进行分析的方法。建立了单层二硫化钼薄膜摩擦原子模型,针对载荷和环境温度这2个空间滚动轴承的重要影响因素展开了二硫化钼薄... 针对空间滚动轴承往复运动状态下二硫化钼薄膜润滑失效机理不明的难题,提出了采用分子动力学对薄膜润滑过程进行分析的方法。建立了单层二硫化钼薄膜摩擦原子模型,针对载荷和环境温度这2个空间滚动轴承的重要影响因素展开了二硫化钼薄膜的往复摆动模拟,得到了摩擦过程中二硫化钼薄膜的摩擦力、粘附力和磨损情况。模拟结果表明:Fe-Ni-Cr合金探针在单层二硫化钼薄膜上的摩擦为黏滑运动,载荷在20~100 nN范围内探针的摩擦过程不会对薄膜造成磨损,但在往复运动过程中润滑性能有所提高;载荷从200 nN开始探针的摩擦过程会对薄膜造成磨损,往复运动过程中摩擦系数不断提高,润滑性能下降;400 nN为单层薄膜的载荷极限,在该载荷下探针会刺穿薄膜与基底接触此时薄膜迅速磨损失去润滑作用。环境温度在1 773.15 K以下对薄膜的润滑作用影响不明显,但达到该温度后薄膜边界处开始缓慢熔化,当环境温度达到二硫化钼熔点时薄膜的熔化速度加快并失去润滑作用。从这些发现得到如下结论:二硫化钼单层薄膜在接触载荷8 GPa以下拥有优异的耐磨性和润滑性;在薄膜未破损的条件下,反复摩擦过程提升了润滑性能;二维层状结构对单层二硫化钼薄膜润滑性能有重要的影响,高温和重载都会对薄膜层状结构造成破坏。 展开更多
关键词 二硫化钼 Fe-Ni-Cr合金 分子动力学仿真 微观摩擦 空间滚动轴承
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二硫化钼在棉织物表面的沉积及其光动力抗菌性能的研究
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作者 廖师琴 王清清 《化工新型材料》 CAS CSCD 北大核心 2024年第11期226-230,234,共6页
采用一步水热法制备了基于二硫化钼(MoS_(2))的棉织物(CFs)和废旧棉织物(WFs)复合材料用于光动力抗菌灭活,并探究了复合材料的微观结构、元素分布、热稳定性、机械性能、光动力抗菌性能(灭活金黄色葡萄球菌和大肠杆菌)以及光催化性能(... 采用一步水热法制备了基于二硫化钼(MoS_(2))的棉织物(CFs)和废旧棉织物(WFs)复合材料用于光动力抗菌灭活,并探究了复合材料的微观结构、元素分布、热稳定性、机械性能、光动力抗菌性能(灭活金黄色葡萄球菌和大肠杆菌)以及光催化性能(降解孔雀石绿染料)。结果表明:CFs/MoS与WFs/MoS_(2)复合材料均具有优异的光动力抗菌效应,5min内光照条件下对金黄色葡萄球菌和大肠杆菌的抗菌率高达99.999%(最低检测限度),并具有显著的光催化降解染料能力(>60%),为光触媒抗菌环保材料开发提供了新方向。 展开更多
关键词 光动力抗菌 水热合成 二硫化钼 染料降解 棉织物
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MoS_(2)的制备及其超声催化性能
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作者 马占营 王钰 +1 位作者 兰月丽 全华清 《咸阳师范学院学报》 2024年第2期20-24,共5页
以钼酸钠和硫脲为原料,用水热法制备了系列MoS_(2)催化剂,采用XRD、SEM、TEM等技术,对MoS_(2)催化剂的晶相结构及表面形貌尺寸等进行了表征,以染料亚甲基蓝探究了MoS_(2)样品的超声催化性能。结果表明,所得MoS_(2)催化剂粒径分布范围为0... 以钼酸钠和硫脲为原料,用水热法制备了系列MoS_(2)催化剂,采用XRD、SEM、TEM等技术,对MoS_(2)催化剂的晶相结构及表面形貌尺寸等进行了表征,以染料亚甲基蓝探究了MoS_(2)样品的超声催化性能。结果表明,所得MoS_(2)催化剂粒径分布范围为0.5~5μm,当钼酸钠与硫脲摩尔比小于等于1∶9时,所得MoS_(2)样品具有六方晶相结构及结晶度相对较好;超声催化实验结果表明,钼硫摩尔比为1∶3时,所得MoS_(2)的超声催化性能最佳,超声12 min时,对亚甲基蓝的降解率可达94.08%。 展开更多
关键词 二硫化钼 超声催化 制备 水热法
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高温溶胀下二硫化钼/丁腈橡胶力学和摩擦性能分子动力学模拟 被引量:1
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作者 钱程 赵晶 +2 位作者 李云龙 刘中强 王世杰 《润滑与密封》 CAS CSCD 北大核心 2024年第9期42-51,共10页
为研究高温环己烷(C_(6)H_(12))溶胀下,二硫化钼(MoS_(2))对丁腈橡胶(NBR)复合材料力学及摩擦学性能的影响,使用蒙特卡洛法和Forcite模块分别建立纯NBR、溶胀NBR、NBR/MoS_(2)和溶胀NBR/MoS_(2)复合材料模型,研究MoS_(2)对NBR高温溶胀... 为研究高温环己烷(C_(6)H_(12))溶胀下,二硫化钼(MoS_(2))对丁腈橡胶(NBR)复合材料力学及摩擦学性能的影响,使用蒙特卡洛法和Forcite模块分别建立纯NBR、溶胀NBR、NBR/MoS_(2)和溶胀NBR/MoS_(2)复合材料模型,研究MoS_(2)对NBR高温溶胀、力学和摩擦学性能的影响,并探讨MoS_(2)改善高温溶胀NBR的机制。结果表明:C_(6)H_(12)溶胀使NBR的力学性能下降,但在添加MoS_(2)后,复合材料的力学性能得到提高;C_(6)H_(12)溶胀使NBR内部分子链迁移、运动速率加快,但在添加MoS_(2)后,有效地抑制了C_(6)H_(12)溶胀;C_(6)H_(12)溶胀会使NBR复合材料表面分子链增加,导致NBR摩擦学性能下降,但添加MoS_(2)后,复合材料的摩擦学性能也有所提升。由于MoS_(2)较大的比表面积以及较强的范德华力和静电力吸附作用,添加MoS_(2)能改善高温C_(6)H_(12)溶胀下NBR复合材料的力学与摩擦学性能。 展开更多
关键词 丁腈橡胶 环己烷溶胀 二硫化钼 摩擦学性能 分子动力学
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金属氧/硫化物修饰石墨烯复合纤维及其柔性超级电容器 被引量:1
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作者 李文娜 谢帆钰 +3 位作者 杜苑 贾潇雨 李宏伟 张梅 《北京服装学院学报(自然科学版)》 CAS 2024年第1期28-35,共8页
纤维型柔性超级电容器由于其高功率密度、长循环寿命、微型化、优异柔韧性等特点,在可穿戴电子产品、智能织物领域备受关注。以氧化石墨烯和片状二硫化钼为混合纺丝液,通过限域水热法组装制备二硫化钼/石墨烯复合纤维,并在纤维表面原位... 纤维型柔性超级电容器由于其高功率密度、长循环寿命、微型化、优异柔韧性等特点,在可穿戴电子产品、智能织物领域备受关注。以氧化石墨烯和片状二硫化钼为混合纺丝液,通过限域水热法组装制备二硫化钼/石墨烯复合纤维,并在纤维表面原位均匀沉积二氧化钌,制备二氧化钌@二硫化钼/石墨烯复合纤维(RuO_(2)@MoS_(2)/GF)。采用SEM、TEM、XPS、XRD等测试方法对复合纤维进行结构形貌表征,并组装纤维型超级电容器,评价其在凝胶电解质体系的电化学性能。结果表明:在电流密度为0.2 mA/cm^(2)时,RuO_(2)@MoS_(2)/GF的比电容为685 mF/cm^(2),同时具有良好的循环稳定性,充放电循环6000次后,比电容保持率80%;通过将纤维型超级电容器串联,实现为电子计时器实际供能,促进石墨烯纤维在智能可穿戴领域的应用。 展开更多
关键词 石墨烯纤维 二硫化钼 二氧化钌 柔性超级电容器
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2D/3D MoS_(2)/HTCN异质结制备及光催化固氮综合实验 被引量:1
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作者 温福山 黄晓栗 +1 位作者 李亚杰 王有和 《实验技术与管理》 CAS 北大核心 2024年第1期44-51,共8页
光催化固氮是目前光催化领域的一个重要研究方向。该文利用自组装法合成了2D/3D MoS_(2)/HTCN光催化剂,并通过XRD、XPS、SEM、TEM、UV-vis DRS、PL和EIS等技术对催化剂进行了表征。在模拟太阳光的条件下,进行了光催化固氮的测试,通过控... 光催化固氮是目前光催化领域的一个重要研究方向。该文利用自组装法合成了2D/3D MoS_(2)/HTCN光催化剂,并通过XRD、XPS、SEM、TEM、UV-vis DRS、PL和EIS等技术对催化剂进行了表征。在模拟太阳光的条件下,进行了光催化固氮的测试,通过控制变量法对合成氨的氮源进行了研究,并对光催化固氮的机理进行了探讨。该实验包含了多种材料的制备以及测试工作,综合性强、新颖性高,不仅能培养学生在催化剂合成和表征方面的能力,同时注重培养学生的科研思维,全面提高学生的科研素养。 展开更多
关键词 石墨相氮化碳 二硫化钼 形貌调控 光催化固氮 综合实验
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原子尺度钼系加氢脱硫催化剂的研究进展与展望
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作者 丁禹 杨昌泽 +2 位作者 李军 孙会东 商辉 《化工学报》 EI CSCD 北大核心 2024年第5期1735-1749,共15页
深入探讨了原子尺度钼系加氢脱硫催化剂在加氢脱硫反应中的研究进展。重点关注了MoS_(2)和Co(Ni)MoS微观结构对催化性能的影响,以及活性氢原子生成、硫化条件对催化剂结构和活性的影响。探讨了不同类型MoS_(2)和Co(Ni)MoS边缘结构与加... 深入探讨了原子尺度钼系加氢脱硫催化剂在加氢脱硫反应中的研究进展。重点关注了MoS_(2)和Co(Ni)MoS微观结构对催化性能的影响,以及活性氢原子生成、硫化条件对催化剂结构和活性的影响。探讨了不同类型MoS_(2)和Co(Ni)MoS边缘结构与加氢脱硫性能的构效关系,强调了MoS_(2)边缘的硫-氢基团在反应中的关键作用。此外,详细讨论了噻吩分子在催化剂表面的吸附方式,加深了对噻吩的加氢脱硫机理的了解。最后,强调了载体Al_(2)O_(3)表面氢溢流效应的重要性,通过调控氧化铝载体表面的羟基基团与钼酸根的相互作用,提高了催化活性。总体而言,这些研究结果突显了微观结构在催化活性调控中的关键作用,为提高工业加氢脱硫反应速率提供了有力的支持。 展开更多
关键词 加氢脱硫 催化剂 催化剂载体 密度泛函理论 二硫化钼
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