Ordering to two dimensional strained films

订购二维应变薄膜

• 批准号: 1506634
• 负责人: Kenneth Elder
• 金额: $ 30万
• 依托单位: Oakland University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-15 至 2020-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1506634&HistoricalAwards=false
• 关键词: Ordering; two; dimensional; strained; films

NONTECHNICAL SUMMARYThis award supports theoretical research and education devoted to the study of ultra-thin coatings or films on metallic surfaces with emphasis on novel materials with a particular honeycomb crystalline symmetry. Examples include graphene and hexagonal boron nitride. These films have been shown to possess unusual electronic and mechanical properties that many researchers are working toward exploiting for technological applications. The award addresses the development of new theoretical methods for predicting the growth and properties of such films under different experimental conditions. This award supports training graduate students in sophisticated mathematical and computational techniques and the PI's broader educational activities through summer schools, tutorials, and workshops. This project involves international collaborations with researchers in Europe, South America, and Africa. TECHNICAL SUMMARYThis award supports theoretical research and education in materials physics with specific applications to the growth of two-dimensional or quasi two-dimensional films on metallic substrates. The coupling between the film and substrate gives rise to strain induced patterning and interesting commensurate/incommensurate phase transitions. Modeling such systems is complicated by the many possible length scales involved as the size of the patterns is inversely proportional to the film/substrate misfit strain in the weak adhesion limit and can diverge near the commensurate/incommensurate transition. To overcome this difficultly the PI plans to develop a model based on the phase field crystal model that can be used to study micron sized systems and incorporates atomistic details of the film/substrate interaction, elasticity and dislocations. The PI will examine the ordering of honeycomb monolayers on triangular and honeycomb substrates. The results of this work will be applicable to materials systems such as graphene, hexagonal boron nitride and molybdenum disulphide. The goal of this research is to predict the nature of the patterns that form as a function of misfit strain, adhesion strength and external conditions such as temperature. This award supports training graduate students in sophisticated mathematical and computational techniques and the PI's broader educational activities through summer schools, tutorials, and workshops. This project involves international collaborations with researchers in Europe, South America, and Africa.

非技术总结该奖项支持致力于金属表面超薄涂层或薄膜研究的理论研究和教育，重点是具有特定蜂窝晶体对称性的新型材料。 实例包括石墨烯和六方氮化硼。这些薄膜已被证明具有不寻常的电子和机械性能，许多研究人员正在努力开发技术应用。 该奖项致力于开发新的理论方法，用于预测在不同实验条件下此类薄膜的生长和性能。 该奖项支持培训研究生在复杂的数学和计算技术和PI的更广泛的教育活动，通过暑期学校，辅导和研讨会。该项目涉及与欧洲，南美和非洲研究人员的国际合作。该奖项支持材料物理学的理论研究和教育，具体应用于在金属基底上生长二维或准二维薄膜。 膜和衬底之间的耦合引起应变诱导的图案化和有趣的相称/不相称的相变。 由于涉及许多可能的长度尺度，对此类系统进行建模变得复杂，因为图案的尺寸与弱粘附极限中的薄膜/衬底失配应变成正比，并且可能在相称/不相称转变附近发散。 为了克服这一困难，PI计划开发一种基于相场晶体模型的模型，该模型可用于研究微米尺寸的系统，并结合膜/衬底相互作用、弹性和位错的原子细节。PI将检查三角形和蜂窝状基底上的蜂窝状单层的有序性。这项工作的结果将适用于材料系统，如石墨烯，六方氮化硼和二硫化钼。 这项研究的目的是预测形成的图案的性质作为失配应变，粘合强度和外部条件，如温度的函数。该奖项支持培训研究生在复杂的数学和计算技术和PI的更广泛的教育活动，通过暑期学校，辅导和研讨会。该项目涉及与欧洲，南美和非洲研究人员的国际合作。