Graphene-SiC Interface: Effect of Atomic Bonding Type on Thermal Transport

CBET - 1235852 PI：Xinwei Wang，爱荷华州州立大学在该项目中，将开发一种基于稳态焦耳加热和同步拉曼光谱的新技术，以测量和区分石墨烯及其衬底之间的温度。该技术能够在平面外方向上实现纳米分辨率，用于热映射。系统了解石墨烯和SiC之间的热传输，以及这种界面热阻如何受到两种典型界面的影响：具有货车范德华力的界面和具有共价键的界面。将进行原子建模以评估石墨烯-界面热阻并补充实验数据，以提供石墨烯-SiC界面处的热传输的交叉基准和补充的深度和全谱图。对于石墨烯基器件和系统的热设计，该项目将建立一个关于货车德瓦尔斯和共价键维持的界面热阻的重要定量知识库。更广泛的影响。研究结果将被整合到爱荷华州州立大学现有的和新的课程中。本科生参与夏季研究将通过在ISU的PERUSE计划促进。包括对K-12学生的宣传，并将涉及当地高中尖子生对独立学习项目的监督。

CBET - 1235852 PI: Xinwei Wang, Iowa State UniversityIn this project, a novel technology based on steady-state joule heating and simultaneous Raman spectroscopy will be developed to measure and distinguish the temperature between graphene and its substrate. This technology enables nanometer resolution in the out-of-plane direction for thermal mapping. Systematic knowledge will be built about thermal transport between graphene and SiC, and how this interface thermal resistance is affected by two typical interfaces: interface featuring Van der Waal force and interface with covalent bond. Atomistic modeling will be conducted to evaluate the graphene-interface thermal resistance and complement the experimental data to provide a cross-benchmarked and complemented in-depth and full-spectrum picture of the thermal transport at graphene-SiC interface. For thermal design in graphene-based devices and systems, this project will establish an important quantitative knowledge base about the interface thermal resistance sustained by Van der Waals and covalent bonds. Broader impacts. The results of the research will be integrated into existing and new courses at Iowa State University. Undergraduate participation in summer research will be facilitated through the PERUSE program at ISU. Outreach to K-12 students is included, and will involve supervision of independent study projects by top students from local high schools.