Few layer graphene (FLG) intercalated compounds form a new generation of graphene derivative systems where novel physical phenomena such as superconductivity and magnetism may emerge. Experimental realization of intercalated FLGs has been limited by harsh intercalation processes, which are often incompatible with mesoscopic device fabrication techniques. We developed a device platform to electrochemically intercalate FLGs in-situ in a controlled manner and minimize sample degradation from parasitic side reactions in the electrolyte by passivating sample surfaces using a combination of hexagonal-boron nitride (h-BN) and photoresists. By monitoring the reaction in real time via Hall measurements and Raman spectroscopy, we show that this platform not only allows for intercalation between stacked graphene layers but that lithium ions can also be inserted in the van der Waals gap between graphene and h-BN. With the advent of a number of 2D systems such as silicon carbide and transition metal dichalcogenides, this method could pave the way for a new series of intercalated heterostructures.

Lithium intercalation of graphene/hexagonal-boron nitride heterostructures

251st National Meeting (2016)

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