Development of long-range conductivity mechanisms in glass-like carbon

verfasst von

Jaspa Stritt, Jerome A. Cuenca, Evan L.H. Thomas, Oliver A. Williams

Abstract

The conductivity mechanisms in glass-like carbon synthesised from SU-8 3005 photoresist are explored as a function of pyrolysis temperature (between 700–750 °C) utilising microwave dielectric spectroscopy techniques. Broadband measurements using an open-ended coaxial probe (BCP) are used to investigate the complex permittivity and conductivity as a function of frequency and show the development of long range conduction and sp

² carbon chain formation. Fixed frequency resonance measurements using microwave cavity perturbation (MCP) methods are shown as a way of measuring this transition and change in Q-factor without requiring contacts and therefore acting as a effective method for non-destructive and non-invasive measurements. Using these methods we show a clear change in the AC conductivity of glass-like carbon at a pyrolysis temperature of ∼730 °C and demonstrate how microwave cavity perturbation (MCP) can be used as a non-contact method of dielectric spectroscopy for determining the transition of conductivity mechanisms in glass-like carbon from short to long range and therefore as a method for non-destructive material quality control. We demonstrate that both BCP and MCP dielectric spectroscopy methods are effective at clearly detecting changes in the structure and conductivity mechanisms of glass-like carbon over a small pyrolysis temperature range.

Externe Organisation(en)

Cardiff University

Typ

Artikel

Journal

CARBON

Band

223

ISSN

0008-6223

Publikationsdatum

10.04.2024

Publikationsstatus

Veröffentlicht

Peer-reviewed

ASJC Scopus Sachgebiete

Chemie (insg.), Werkstoffwissenschaften (insg.)

Elektronische Version(en)

https://doi.org/10.1016/j.carbon.2024.119027 (Zugang: Offen)