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

Stritt, Jaspa, Cuenca, Jerome A. ORCID: https://orcid.org/0000-0003-1370-1167, Thomas, Evan L.H. and Williams, Oliver A. ORCID: https://orcid.org/0000-0002-7210-3004 2024. Development of long-range conductivity mechanisms in glass-like carbon. Carbon 223 , 119027. 10.1016/j.carbon.2024.119027

Preview

PDF - Published Version Available under License Creative Commons Attribution. Download (2MB) | Preview

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 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.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Publisher:	Elsevier
ISSN:	0008-6223
Funders:	EPSRC
Date of First Compliant Deposit:	7 June 2024
Date of Acceptance:	7 March 2024
Last Modified:	17 Jun 2024 10:29
URI:	https://orca.cardiff.ac.uk/id/eprint/169599

Actions (repository staff only)

Edit Item