Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session B39: 2D Materials: Formation Pathways and Mechanisms, Heterostructures and Defects I
11:30 AM–2:18 PM,
Monday, March 6, 2023
Room: Room 231
Sponsoring
Unit:
DMP
Chair: Stephan Hofmann, University of Cambridge; Ageeth Bol, University of Michigan
Abstract: B39.00001 : Formation Pathways in Intercalated 2D Materials and Heterostructures*
11:30 AM–12:06 PM
Presenter:
Judy J Cha
(Cornell University)
Author:
Judy J Cha
(Cornell University)
Presently, new 2D material systems, nanoscale confinement, construction of heterostructures using dissimilar 2D materials, and twist-angle induced Moiré physics, combined with multi-modal, in situ probes, provide exciting opportunities to revisit the intercalation studies in 2D systems to look for novel effects and to establish mechanistic understandings of the intercalation pathways and formation pathways of intercalation-induced emergent phases.
In this talk, I will discuss electrochemically controlled lithium intercalation into nanoflakes of graphene, MoS2, WTe2, and their heterostructures using nanodevice electrochemical cells that allow structural characterization and magneto-transport property measurements as a function of lithium intercalation, in situ. We discover drastic changes in the thermodynamics of lithium staging in graphite due to bending-induced strain; large interfacial effects in the nucleation of the metallic 1T’-MoS2 from 2H-MoS2 via lithium intercalation; and a new, insulating phase in semimetallic Td-WTe2 via lithium intercalation. Our studies present intercalation as an effective post-synthesis design knobs to control and form new 2D materials.
*NSF CAREER 1749742Moore Foundation EPiQS Synthesis Investigator
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