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NM2: 2D Layers and Heterostructures beyond Graphene—Theory, Preparation, Properties and Devices

Mauricio Terrones, The Pennsylvania State University

Defect Engineering in 2-Dimensional Materials—Graphene, Doped-Graphene and Beyond

Written by Yuanyuan Zhu

Mauricio Terrones at The Pennsylvania State University presented an overview on one of the most important current topics in the research area of two-dimensional (2D) functional nanomaterials on their defect engineering. Terrones’ research group concentrates on challenging synthesis of high-quality graphene and doped graphene on copper substrates by chemical vapor deposition. With the combined capability of both synthesis and characterization, the research team was able to study the correlation between deposition condition and defects type and density in graphene and nitrogen-doped graphene, as well as assemble 2D chalcogenides with different heterogeneous structures. Using scanning tunneling microscopy, Raman spectroscopy, and density functional theory calculations, the researchers suggested that the structural origin for doped graphene working as highly sensitive gas sensors could stem from promoted charge transfer because of band structure modification with the presence of nitrogen dopants. Despite the continuous progress in recent research, fabrication of the 2D electron device with well-controlled defects remains a challenge.

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