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Fundamental Investigation of Dynamic Phenomena in Atomically Thin Layered Materials

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Technical Report,01 Aug 2015,30 Apr 2019

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Virginia Polytechnic Institute and State University Blacksburg United States

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Major Goals The major goals of this research are to investigate novel thermodynamic phenomena of atomically thin layered materials, and to elucidate the interplay between local structures and dynamic behaviors as well as external field effects, by developing time-dependent in situ scanning probe techniques, combined scanning tunneling microscopy STM and atomic force microscopy AFM. The proposed research aims to provide fundamental understanding of the mechanisms governing dynamic processes in two-dimensional 2D materials. Results obtained from this project will be applied to mass transport, growth, shaping, site-specific heterogeneous catalysis, and gas sensing, and will have significant and broad impact on national security by providing predictive information regarding stability, reliability, and lifetime of devices based on 2D materials, and also for optimizing preparation of 2D materials. Accomplishments We have successfully reached these goals. During the whole report period, we have published 12 peer reviewed papers in high impact journals, such as JACS, Nano Letters, Angew. Chem, ACS Nano., etc. 1-12, presented 15 conference presentations in national and international conferences, and received 4 awards. Below are the research activities were performed during the whole period and the highlight of our remarkable accomplishments. In the first year of ARO support, we have investigated the interfaces in mono- and few-layered MoS2, TiSe2 and graphene. We have made several remarkable observations about these systems, including unique edge states of MoS2 and charge density waves in TiSe2. We have performed experiments on monolayer vacancy island growth induced by a vertical electrical field on TiSe2, which is the beginning of studying dynamic properties of atomically thin TMDs. These layered materials were prepared on various substrates, including insulating substrates such as SiO2 and sapphire.

Subject Categories:

  • Thermodynamics
  • Miscellaneous Materials
  • Physical Chemistry

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