Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

Investigating the broadband microwave absorption of nanodiamond impurities

Cuenca, Jerome A. ORCID:, Thomas, Evan L. H., Mandal, Soumen ORCID:, Williams, Oliver Anuerin ORCID: and Porch, Adrian ORCID: 2015. Investigating the broadband microwave absorption of nanodiamond impurities. IEEE Transactions on Microwave Theory and Techniques 63 (12) , pp. 4110-4118. 10.1109/TMTT.2015.2495156

[thumbnail of Cuenca et al. - 2015 - Investigating the Broadband Microwave Absorption of Nanodiamond Impurities.pdf]
PDF - Published Version
Available under License Creative Commons Attribution.

Download (1MB) | Preview


Broadband microwave complex permittivity measurements of nanodiamond powders are presented. Previous studies show that measurements of dielectric loss strongly correlate with the presence of nondiamond surface impurities. In this study, the frequency dependence of these losses is investigated using the microwave cavity perturbation (MCP) and broadband coaxial probe (BCP) methods. This allowed further understanding as to what mechanisms contribute to the microwave absorption (free electron conduction or dielectric loss from the disordered surfaces). A multimode MCP system is used which utilizes ${rm TM}_{0np}$ modes to provide partial spectral characterization. The MCP results revealed minimal frequency dependence, unlike any static conduction-related mechanism. The BCP measurements corroborate the MCP results with much higher spectral resolution, and further demonstrate that disorder related loss may dominate over free electron conduction from 1–10 GHz. From 0.1–1 GHz, free electron conduction has a greater influence with a characteristic $1/f$ dependence implying that conduction may dominate at lower frequencies. However, the BCP method, while repeatable, lacks in precision compared to the cavity method. Nonetheless, the major conclusion in this paper is that through simple microwave permittivity measurements, nondiamond carbon impurities in nanodiamond powders are measurable most likely because of disorder related losses as opposed to free electron conduction.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Physics and Astronomy
Publisher: IEEE
ISSN: 0018-9480
Funders: EPSRC
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 17 November 2015
Last Modified: 06 Jan 2024 02:38

Citation Data

Cited 18 times in Scopus. View in Scopus. Powered By Scopus® Data

Actions (repository staff only)

Edit Item Edit Item


Downloads per month over past year

View more statistics