Thickness-dependent patterning of MoS2 sheets with well-oriented triangular pits by heating in air
溅射MoS_2膜的特征形态及摩擦变化
溅射MoS_2膜的特征形态及摩擦变化IntroductionMolybdenum disulfide (MoS2) has emerged as a promising material for various applications due to its unique electronic, optical and mechanical properties. Among them, the thin-film MoS2 has become an important research target due to its outstanding properties of high transparency, flexibility and chemical stability. However, the adhesion and friction properties of MoS2 films are still in the early stage of investigation. In this work, we study the characteristic morphology of sputtered MoS2 films and their frictional behavior under different environmental conditions.Experimental ProceduresThe MoS2 thin films were deposited on a silicon wafer substrate using a magnetron sputtering technique, under an Ar gas pressure of 3×10-3 Torr and a substrate temperature of 300 °C. The thickness of the films was approximately 100 nm. The films were then characterized by scanning electron microscopy (SEM) and atomic force microscopy (AFM) to analyze their surface morphology and topography. The friction properties of the films were evaluated using a microtribometer by measuring the coefficient of friction (COF) under different environmental conditions, including dry nitrogen, air, and water vapor.Results and DiscussionThe SEM images showed that the MoS2 films exhibited a uniformsurface morphology with a slight roughness, indicating a good adhesion to the substrate. The AFM images revealed that the films had a smooth surface with a root-mean-square (RMS) roughness of 0.67 nm, which was attributed to the crystal structure of MoS2. The topography of the films showed a layered structure consisting of parallel ridges and trenches, which was consistent with the hexagonal structure of the MoS2 crystal.The COF measurements showed that the frictional behavior of the MoS2 films was strongly dependent on the environmental conditions. In dry nitrogen, the COF was relatively low, around 0.06, which can be attributed to the formation of an ultra-thin boundary lubrication film on the surface of the films. Under air and water vapor environments, the COF increased to around 0.12 and 0.22, respectively. This increase can be attributed to the adsorption of water vapor molecules on the surface of the films, which leads to a decrease in the contact area and an increase in the interfacial adhesion.ConclusionIn this work, we investigated the characteristic morphology of sputtered MoS2 thin films and their frictional behavior under different environmental conditions. The MoS2 films exhibited a uniform surface morphology with a layered structure consisting of ridges and trenches. The films showed good adhesion behavior and the COF was strongly dependent on the environmental conditions. This study can provide valuable insights into the adhesion and frictional behavior of MoS2 films for potential applications in various fields, such as microelectromechanical systems andnanotribology.Furthermore, the adhesion and friction properties of MoS2 films are related to their thickness and crystal orientation. It has been reported that thinner MoS2 films have better adhesion and lower friction compared to thicker films due to the decreased thickness of the lubrication layer. Additionally, the crystal orientation of the MoS2 film can also affect its frictional behavior. It has been observed that the basal plane of the MoS2 crystal shows lower friction than the edge plane due to its lower surface energy and weaker interlayer interaction.In terms of practical applications, MoS2 films have shown promising results for their use as a solid lubricant in microelectromechanical systems (MEMS) and nanotribology. The low-friction properties of MoS2 films can reduce wear and prolong the lifespan of MEMS devices. Additionally, MoS2 films can also be used as protective coatings for metals and alloys, as they can provide improved wear resistance and corrosion protection.In conclusion, the adhesion and frictional behavior of MoS2 films are essential characteristics to consider for their potential applications. This study provides insights into understanding the surface morphology, topography, and frictional behavior of sputtered MoS2 films under different environmental conditions, which can be beneficial for further research and practical applications.Furthermore, the lubricating behavior of MoS2 films is also influenced by their surface chemistry and topography. The surface chemistry of MoS2 films can be altered through surface modifications such as surface functionalization or doping with other elements, which can affect their adhesion and friction properties. Moreover, the topography of MoS2 films such asroughness and morphology can also significantly affect their lubricating behavior. For example, MoS2 films with a high aspect ratio can exhibit excellent lubrication properties due to their ability to form anisotropic grooves that act as effective lubrication pockets.MoS2 films can also be combined with other materials to improve their functionality and expand their application scope. For instance, MoS2 can be used as a composite material with other 2D materials such as graphene or hexagonal boron nitride to enhance its tribological performance further. The hybrid 2D materials can provide synergistic effects such as increased hardness, wear resistance, and surface smoothness, which is essential for tribological applications.Aside from tribology, MoS2 films have also attracted considerable attention for their applications in sensors and electronics. The electronic properties of MoS2 films depend on their thickness, grain size, and doping. It has been shown that thinner MoS2 films have higher electrical conductivity, which is essential for electronic applications such as transistors and solar cells.In summary, MoS2 films have demonstrated excellent friction and wear properties in various environments, and their surface characteristics play a crucial role in their tribological behavior. The potential applications of MoS2 films span across multiple fields, such as microelectromechanical systems, protective coatings, sensors, and electronics, presenting vast opportunities for further research and development.One of the most promising applications of MoS2 films is in the field of nanotribology, where they can be utilized as lubricant coatings for MEMS and NEMS devices. Inthese devices, friction and wear are critical issues that can affect their performance and longevity. By coating the surface of the devices with MoS2 films, it is possible to reduce friction and wear, thereby increasing their efficiency and durability.MoS2 films are also attractive for their mechanical properties, which make them suitable for use as protective coatings. For example, MoS2 can be used to coat tools and machinery to reduce wear and to protect against corrosion. Furthermore, due to their unique structure and properties, MoS2 films have the potential to be used as flexible and transparent coatings in wearable electronics and displays.MoS2 films have also found applications in the development of biosensors and medical devices. By modifying the surface chemistry of the films, it is possible to create coatings that can capture specific biomolecules, such as proteins or DNA. This has led to the development of biosensors that can detect a wide range of biomolecules, including disease markers, which could have significant implications for medical diagnoses and treatment. Overall, the unique properties of MoS2 films make them promising materials for a wide range of applications, from tribology to electronics and biosensors. With ongoing research and development, it is expected that new and exciting applications of MoS2 films will continue to be discovered.Yes, as research into the properties and potential applications of MoS2 films continues, it is likely that new and innovative uses will be discovered. Some possible future applications include:- Energy storage: MoS2 has been explored as a potential material for energy storage devices, such as batteries and supercapacitors. Its high surface area and ability to absorb and release ions make it an attractive option for these applications.- Catalysis: MoS2 has shown promise as a catalyst for a range of chemical reactions, including hydrogen evolution, water splitting, and carbon dioxide reduction. This could have important implications for sustainable energy production and environmental remediation.- Optoelectronics: MoS2 has unique optical properties that make it attractive for use in photovoltaics, LEDs, and other optoelectronic devices. Its ability to emit light in the visible range also makes it a potential material for lighting applications.- Biomedical applications: MoS2 films have already been explored for use in biosensors and medical devices, but further research could uncover new applications in drug delivery, tissue engineering, and other biomedical applications.Overall, the versatility and potential of MoS2 films make them an exciting area of research and development for a wide range of industries and applications.。
采用溶胶-凝胶法在刀具表面制备MoS_2软涂层的研究
采用溶胶-凝胶法在刀具表面制备MoS_2软涂层的研究丁志敏;杨贺;李宝良;李丽【摘要】On the basis of MoS2 soft coating on the surface of cemented carbide was successfully obtained by citric acid sol-gel method,influence of added amount of MoS2 in the coating on surface microscopic morphology and friction coefficient of MoS2 coating was studied by scanning electron microscope and friction test.The results indicated that,MoS2 coatings with high quality and good binding with the substrate on surface of cemented carbide samples can be prepared by sol-gel method of respectively adding 13,20,27g/L MoS2 into 1.6mol/L citrate solution and making one on the surface by burshing.The surface morphology of the MoS2 coating is of lamellar.The samples with MoS2 soft coating significantly reduces the friction coefficient from 0.6-0.8 of original sample to 0.15-0.25.But the adding amount of MoS2 in soft coating has no obvious difference in the friction coefficient.The fact that the soft coating could reduce the friction coefficient of samples could be attributed to the presence of the coating with MoS2,that has advantages of lower friction and great bearing capacity,and changed friction nature between the friction pairs materials becauce of the existence of coating.%在成功地采用柠檬酸溶胶-凝胶法在硬质合金试样表面制备出MoS2软涂层的基础上,采用扫描电镜形貌观察和摩擦系数测定等实验方法研究了MoS2加入量对涂层表面微观形貌及其摩擦性能的影响规律。
基于第一性原理的MoS2体系能带结构研究
基于第一性原理的MoS2体系能带结构研究MoS2作为一种典型的层状二维半导体材料，因其存在直接带隙，所以其能带结构优于石墨烯，在电磁学和电子器件等科学技术领域都有很好的应用价值。
论文基于第一性原理，采用castep软件，计算了不同层数MoS2的能带结果。
结果表明，随着层数的减少MoS2从间接带系转变为直接带系半导体，单层MoS2直接带隙宽度约1.8eV。
这一结果为MoS2在晶体管制造、分子传感器等领域的广泛应用提供了理论基础。
【Abstract】As a typical layered two-dimensional semiconductor material，MoS2 has direct band gap，its band structure is superior to graphene，so it has good application value in the fields of electromagnetics and electronic devices. Based on the first principle，this paper uses castep software to calculate the band results of different layers of MoS2. The results show that with the decrease of the number of layers，MoS2 changes from the indirect band system to the direct band semiconductor，and the width of the direct band gap of the single layer MoS2 is about 1.8 eV. This result provides a theoretical basis for the wide application of MoS2 in the fields of transistor manufacturing and molecular sensors.【關键词】第一性原理；MoS2；能带；二维材料1 引言2005年，K.S.Novoselov等研究者为了更好地描述石墨烯和类石墨烯材料的二维结构，提出了二维原子晶体概念。
二维MoS2 MoO2混合层结构的制备与表征
Advances in Condensed Matter Physics 凝聚态物理学进展, 2019, 8(2), 33-40Published Online May 2019 in Hans. /journal/cmphttps:///10.12677/cmp.2019.82005Preparation and Characterization of TwoDimensional MoS2/MoO2 Mixed StructuresJiajun Deng*, Chenxiao Ye, Yanfeng Huang, Jiantao Che, Wenjie Wang, Xunlei DingSchool of Mathematics and Physics, North China Electric Power University, BeijingReceived: April 30th, 2019; accepted: May 15th, 2019; published: May 22nd, 2019AbstractIn recent years, semiconducting two-dimensional transition metal dichalcogenides have been concerned for their potential applications in the semiconductor industry. In this paper, the hexagonal and rhomboic MoS2/MoO2 mixed structures were prepared by chemical vapor deposition method using MoO3powder and S powder as precursors. First, the morphology of samples was observed by optical microscopy and SEM, and then the composition of samples was determined by XPS and EDS. Finally, the MoS2/MoO2 mixed structures of samples we prepared was confirmed by the Raman spectra. At the same time, we tried to explore the growth mechanisms of the mixed structure by comparative experiments.KeywordsTwo-Dimensional Materials, CVD, MoS2/MoO2 Mixed Structure二维MoS2/MoO2混合层结构的制备与表征邓加军*，叶晨骁，黄燕峰，车剑韬，王文杰，丁迅雷华北电力大学数理学院，北京收稿日期：2019年4月30日；录用日期：2019年5月15日；发布日期：2019年5月22日摘要近年来，半导体性的二维过渡金属硫族化合物(2D-TMDCs)由于其在半导体工业上的潜在应用而备受青睐。
二维MoS 2生物传感器
二维MoS 2生物传感器1、摘要：二维二硫化钼的独特性质（2D MOS 2）迄今对于这种材料的原理，应用等已有深入的研究。
最近，对其潜在的生物传感功能有更多的研究。
二维MOS 2具有使其成为开发生物传感器的性质。
这些属性包括表面积大，可调的能带图，比较高的电子迁移率，光致发光，液体介质中的稳定性，毒性相对较低，与intercalatable形态。
在这篇综述中，对二维MOS 2传感器目前的进展和未来前景对各种生物传感应用扩展的可能性进行了讨论。
关键词：过渡金属硫化物、传感、生物系统、插层，几层，原子层，二硫化钼，二维六方二硫化钼（2H MOS 2）是一个分层晶体。
2HMoS 2晶体结构的平面，厚度等于该材料的晶胞这是由范德瓦尔斯力结合在一起。
MoS 2每个平面是由钼原子夹在硫原子之间（图1）。
当剥离成一个或有限层数、二维MOS 2（2D MOS 2）显示独特的电子，光学，机械，和化学特性。
二维MoS 2显示出非凡的的特性，也使它有利于生物传感器应用。
当成长为面有比较大横向尺寸，二维MoS 2平面到表面没有悬空键的结束。
结果，这些大平面在液体和含氧介质中特别稳定媒体，这有助于他们有效地融入生物传感结构。
在纳米片的形态，当表面的厚度比减少，二维MoS 2边缘和角可以设计为钼或硫终端。
钼终止有机会可能用于需要金属特性时。
类似于单原子层的石墨和其他二维材料，二维MOS 2提供大的表面积，提高了它的传感器的性能。
然而，正如将要讨论的，由于存在的一个合适的能带隙，基于MoS2的设备的整体灵敏度远大于石墨烯和石墨烯氧化物。
石墨烯和石墨烯氧化物没有或能带隙小。
许多化学当量的二维氧化物相比之下，有大的能带隙，电子能带结构调制的应用需要相对较高的能量。
二维MOS 2非常地薄，与目标生物材料相互作用后，其整体厚度受到影响。
历史上，二维MoS 2是常用的一种润滑材料。
结果，其插层学经历了几十年的经验密集的研究，因此相关的化学被彻底描述清楚。
基于核黄素磷酸钠功能化MoS2纳米片的电化学基因传感器研究
基于核黄素磷酸钠功能化MOS纳米片的电化学基因传感器研究聂思雨，韩天成，李远卓，王先洋，张伟（临沂大学化学化工学院,山东临沂079009）摘要：构建了一种基于核黄素磷酸钠（RFSP）功能化MSS纳米片的用于PIK3CA基因免指示剂检测的电化学传感器o RFSP作为一种高效的生物分散剂，通过超声剥离法可以在水相中获得高稳定性和分散性的MSS纳米片o 通过RFSP/M o S2纳米复合界面自身电化学信号的变化可以指示DNA的固定和杂交o该DNA电化学生物传感器展示了良好的序列选择性，可以区分不同的碱基序列o应用制备的DNA电化学生物传感器对乳腺癌患者外周血中的循环肿瘤PIK3CA基因片段进行了检测，检测限达到2.3X14-15mX/L。
关键词：核黄素磷酸钠；MXS纳米片；电化学传感器；PIK3CA基因中图分类号:O657.15,TB333文献标识码：A文章编号：1003-3467（2929）12-0011-03Reserrch of ElecOochemicrl Genosensor Based on RiOoOavinr Sodium Phosphate Functionalized MoS NanosheeieNIE Siyu,HAN Tiancheng,LI YuanzOuo,WANG Xianycng,ZHANG Wel* (School of Chemisty ang Chemicot EngineeUna,Linyi University,Linyi277600,China) Abstroch:The Uevelonment ot ridoflayine soOium pposppate(RFSP)functionalizeV M0X2nagosPeets ang tUe-r usaUility for electrocOemicoi Uetection of PIK3CA/vv have been acOieved.The RFSP mo/co/p perfouneV as highty eVicient staUilizer for u/ysonicaUy Uispersina M0S2nuoshats in an dqueonp solution,2s weli as prxviUina the ingerent self-udoy sionai for sensing DNA immonilization ang hyaUcliza・hon.The pronosed plaUoun qpinimn a UesiraUte cauaUility aeainst diffeunt sequences. This constucted uenosensyr peunits quantitative Ueteunination of circolating tumor PIK3CA/ne from breast cancer with a0505(X1/mil of2.3X19_15mol/L.Key worot:RFSP；M0S2nanosPeets；1150x0111:(50sensor；PIK3CA uene起催化作用的磷酸肌醇-3-激酶（PIK3CA）基因是人类癌症中最常见的突变基因之一，在癌症的早期诊断、治疗和预后判断方面具有重要的价值。
过渡金属掺杂单层MoS2的第一性原理计算
过渡金属掺杂单层MoS2的第一性原理计算牛兴平;张石定;窦立璇【摘要】利用基于密度泛函理论的第一性原理平面波赝势方法分别计算了本征及过渡金属掺杂单层MoS2的晶格参数、电子结构和光学性质.计算结果显示,过渡金属掺杂所引起的晶格畸变与杂质原子的共价半径有联系,但并不完全取决于共价半径的大小.分析能带结构可以看到,Co、Ni、Cu、Tc、Re和W掺杂使能带从直接带隙变成了间接带隙.除了Cr和W以外,其它掺杂体系的禁带区域都出现了数目不等的新能级,这些杂质能级主要由杂质的d、S的3p和Mo的4d轨道组成.掺杂对MoS2的光学性质也产生了相应的影响,使MoS2的静态介电常数、介电函数虚部峰值、折射率和光电导率峰值呈现不同程度的增加.【期刊名称】《功能材料》【年(卷),期】2018(049)007【总页数】5页(P7106-7110)【关键词】过渡金属掺杂;二硫化钼;电子结构;光学性质【作者】牛兴平;张石定;窦立璇【作者单位】安阳工学院数理学院,河南安阳 455000;安阳工学院数理学院,河南安阳 455000;安阳工学院数理学院,河南安阳 455000【正文语种】中文【中图分类】O471.50 引言单层MoS2是一种常见的二维半导体材料[1]，每层MoS2的厚度约为0.65 nm，层与层的间距约为0.615 nm[2]。
每层MoS2由一层Mo原子和上下两层S原子组成，层内的原子以共价键结合，层间的原子以Van der Waals力结合。
由于单层MoS2结构的特殊性而拥有独特的电学和光学特性[3]，使其在润滑剂[4]、催化剂[5]、光电子器件[6]、自旋电子器件[7]、能量存储[8]和场效应管[9]等方面有着潜在的应用价值。
掺杂是半导体器件和集成电路工艺中的一个重要环节，可以通过筛选杂质的种类和调节掺杂的水平来控制半导体的光电特性。
人们对过渡金属掺杂单层MoS2的相关研究已有少量报道，例如吴木生等[10]研究了Cr和W掺杂后电子结构的变化情况，发现W掺杂几乎没有影响，而Cr掺杂后所产生的应力对MoS2的能带结构影响很大。
纳米MoS_2的摩擦学特性
纳米MoS 2的摩擦学特性于旭光(北京矿冶研究总院,北京 100044) 摘 要:采用EDS 分析磨痕表面元素的化学状态,扫描电子显微镜观察磨痕表面形貌,在MS 2800A 四球摩擦磨损实验机上考察MoS 2纳米材料作为润滑油添加剂的摩擦学特性。
通过对刚球磨斑直径、PB 值的变化分析MoS 2纳米材料的形貌、添加剂含量对润滑油摩擦性能的影响。
结果表明,MoS 2纳米颗粒具有好的减磨性能和极压性能,MoS 2纳米纤维对增加极压性能影响不大。
随着添加剂含量的增加,润滑油的减磨性降低,极压性提高。
纳米MoS 2对摩擦副的减磨和极压性能改善的原因是由于其吸附于摩擦副表面,在摩擦过程中,纳米MoS 2分解,生成含Mo 的氧化膜,起到改善摩擦学性能的作用。
关键词:无机非金属材料;MoS 2;纳米材料;润滑油添加剂;摩擦学特性中图分类号:TG115158 文献标识码:A 文章编号:1001-0211(2006)04-0005-04收稿日期:2006-04-26作者简介:于旭光(1967-),男,内蒙古赤峰市人,工程师,博士,主要从事新型金属材料的开发与研究。
纳米微粒作为润滑剂或润滑油添加剂表现出优良的摩擦学特性[1-6],业已发现,许多纳米微粒具有优异的自润滑特性和超低摩擦特性,能够显著改善某些表面涂层的摩擦磨损性能,同时在较宽的温度范围内表现出良好的减摩和抗磨作用,在常温至中等高温范围内的连续润滑方面具有潜在的应用价值。
目前对纳米MoS 2摩擦学特性的研究比较多[7],可以通过多种方法获得纳米MoS 2,由不同方法得到的MoS 2纳米颗粒的形态特征和性能等也存在明显差异。
研究采用热分解法制备的不同形态的纳米MoS 2的摩擦学性能,考察纳米材料形态及添加量对润滑油摩擦性能的影响,并探讨其作用机理。
1 实验方法摩擦磨损试验在MS -800A 四球摩擦磨损实验机上进行,以不同的载荷进行试验。
试件为GCr15标准轴承钢球,直径为<1217mm ,硬度为59～61HRC 。