Title :
Broadband microwave measurements of nanodiamond
Author :
Cuenca, Jerome Alexander ; Thomas, Evan ; Mandal, Soumen ; Williams, Oliver ; Porch, Adrian
Author_Institution :
School of Engineering, Cardiff University, CF24 3AA, Wales, UK
Abstract :
Microwave complex permittivity measurements of different nanodiamond powders were measured (in the range of 10nm to 1µm). We have developed a low resolution, high accuracy broadband measurement system using our cylindrical cavity resonator consisting of 6 transverse magnetic (TM) modes ranging from 2.49GHz to 9.43GHz. The particle sizes were also measured using scanning electron microscopy. Surface impurities were found in the powder with the smaller particle sizes using Raman spectroscopy. We observed higher dielectric losses in the powder with impurities. Our broadband measurement system shows that the frequency dependence of the losses were minimal and thus the impurity has a dielectric loss mechanism which is most likely not due to free electron conduction.
Keywords :
Astronomy; Cavity resonators; Conference proceedings; Decision support systems; Dielectric measurement; Europe; Physics; cavity perturbation methods; nanodiamond; permittivity measurement; quality control;
Conference_Titel :
Microwave Conference (APMC), 2014 Asia-Pacific