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O: Fachverband Oberflächenphysik

O 90: 2D Materials VI: Growth, Structure and Substrate Interaction

O 90.5: Talk

Thursday, March 21, 2024, 16:00–16:15, MA 005

Real-Time Multiscale Monitoring and Tailoring of Graphene Growth on Liquid Copper — Valentina Rein¹, Mehdi Saedi², Maciej Jankowski¹, Anastasios Manikas³, Francesco La Porta¹, Christos Tsakonas³, Costas Galiotis³, Gilles Renaud⁴, Oleg Konovalov¹, and •Irene Groot² — ¹ESRF — ²Leiden University — ³University of Patras — ⁴CEA

The synthesis of large, defect-free two-dimensional materials such as graphene is a major challenge toward industrial applications. Chemical vapor deposition on liquid metal catalysts is a recently developed process for the fast synthesis of high-quality single crystals of graphene. However, up to now, the lack of in situ techniques enabling direct feedback on the growth has limited our understanding of the process dynamics and primarily led to empirical growth recipes. Thus, an in situ multi-scale monitoring of the graphene structure, coupled with a real-time control of the growth parameters, is necessary for efficient synthesis. Here we report real-time monitoring of graphene growth on liquid copper (at 1370 K under atmospheric pressure conditions) via four complementary in situ methods: synchrotron X-ray diffraction and reflectivity, Raman spectroscopy, and radiation-mode optical microscopy. This has allowed us to control graphene growth parameters such as shape, dispersion, and the hexagonal supra-organization with very high accuracy. The presented results have far-reaching consequences for studying and tailoring 2D material formation processes on liquid metals during chemical vapor deposition.

Keywords: Graphene growth; Liquid metal catalyst; Chemical vapor deposition; Real-time monitoring