IBS 2DQH Seminar

December 23  2024,  10:30 AM
Sungkyunkwan University, Suwon

Universal van der Waals Printing beyond Integration

Dong Hyup Kim

Department of Chemistry, The University of Chicago, Chicago, Illinois, USA

Abstract

Van der Waals integration of two-dimensional (2D) heterostructures provides a versatile approach to assemble various materials into tailored structures without the need for lattice matching, intricate processing, or consideration of material incompatibilities. Successful integration depends on employing a reliable and efficient transfer medium and technique. In this study, we have demonstrated that the structured liquids, such as hydrogels, as efficient transfer medium for the reliable transfer of 2D materials and beyond. The hydrogel-assisted transfer method enables cleaner transfers, ensuring uniform internal strain distribution and improved transfer stability. Additionally, hydrogel serves as an ideal medium for layer-by-layer laser printing due to its transparency, allowing precise laser patterning and maintaining a clean interface between layers. Individual layers can be freely patterned by laser and also can be stacked without any additional alignment processes because the patterning position and stacking position is always identical, thus finally providing state-of-theart printing capability. We demonstrated that hydrogel-based laser printing facilitates the stacking of a wide variety of materials, extending beyond 2D systems, thereby unlocking new opportunities for hybrid van der Waals integration in device fabrication.

Brief Biography

Dr. Dong Hyup Kim is a postdoc researcher in Chemistry department at the University of Chicago(advisor: Prof. Jiwoong Park). His current

research interests is studying the hybrid van der Waals integration and hybrid 2D heterostructures. He received a B.S. degree in chemical engineering (2016) and a Ph.D. in chemical engineering from Ulsan National Institute of Science and Technology (2021; advisor: Prof. So Youn Kim). Before coming to the University of Chicago, he was a visiting scholar(2022; advisor: Prof. Zahra Fakhraai) at the University of Pennsylvania. His research encompasses 2D heterostructures, van der Waals integration, soft materials, polymer physics, self-assembly, and

glassesto integrate fundamental understandings of nanoscience into potential applications.