Electrical conductivity-morphology relationships of liquid-exfoliated graphite

Harrison Loh; Sunil Gyawali; Konstantinos A. Sierros; Alan D. Bristow

doi:10.1117/12.3001934

8 March 2024 Electrical conductivity-morphology relationships of liquid-exfoliated graphite

Harrison Loh, Sunil Gyawali, Konstantinos A. Sierros, Alan D. Bristow

Proceedings Volume 12884, Ultrafast Phenomena and Nanophotonics XXVIII; 128840B (2024) https://doi.org/10.1117/12.3001934
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Liquid phase exfoliation (LPE) is a frequently employed technique for the scalable production of dispersible graphene and graphite nanosheets for electronic, optoelectronic, and photonic applications. Fundamental information on how the liquid exfoliation process and resulting size-distribution of these nanoflakes affects their electrical properties is lacking. To address this gap, terahertz time-domain spectroscopy (THz-TDS) is employed as a non-contact optical approach for determining the AC conductivity behavior and charge transport dynamics of these materials. Cascade centrifugation is employed to separate exfoliated flakes into a range of sizes as confirmed by profilometry measurements. Correlations between the flake area and carrier concentration/scattering time are observed and related to flake morphology through changes to carrier mean free paths and edge defects. A lack of control to the flake chemistry leaves open questions regarding the influence of doping levels on the charge carrier dynamics, which will be the focus of future work.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Harrison Loh, Sunil Gyawali, Konstantinos A. Sierros, and Alan D. Bristow "Electrical conductivity-morphology relationships of liquid-exfoliated graphite", Proc. SPIE 12884, Ultrafast Phenomena and Nanophotonics XXVIII, 128840B (8 March 2024); https://doi.org/10.1117/12.3001934

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