Evan L. H. Thomas
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Development of long-range conductivity mechanisms in glass-like carbon Open
The conductivity mechanisms in glass-like carbon synthesised from SU-8 3005 photoresist are explored as a function of pyrolysis temperature (between 700–750 \nC) utilising microwave dielectric spectroscopy techniques. Broadband measurement…
Monitoring of the Initial Stages of Diamond Growth on Aluminum Nitride Using In Situ Spectroscopic Ellipsometry Open
The high thermal conductivity of polycrystalline diamond makes it ideally suited for thermal management solutions for gallium nitride (GaN) devices, with a diamond layer grown on an aluminum nitride (AlN) interlayer atop the GaN stack. How…
Polycrystalline Diamond Micro‐Hotplates Open
Micro‐hotplate structures are increasingly being investigated for use in a host of applications ranging from broadband infra‐red sources within absorption‐based gas sensors to in situ heater stages for ultra‐high‐resolution imaging. With d…
In-situ monitoring of microwave plasma-enhanced chemical vapour deposition diamond growth on silicon using spectroscopic ellipsometry Open
The quality of polycrystalline diamond films is heavily dependent on the nucleation and early stages of growth, making the ability to monitor these early stages highly desirable. Spectroscopic ellipsometry (SE) allows for real-time monitor…
Mapping the effect of substrate temperature inhomogeneity during microwave plasma-enhanced chemical vapour deposition nanocrystalline diamond growth Open
It is important to account for variance in substrate temperature during microwave plasma-enhanced chemical vapour deposition (MPECVD) nanocrystalline diamond growth, as this has a significant impact on the uniformity of the grown film. In …
Microwave plasma modelling in clamshell chemical vapour deposition diamond reactors Open
A microwave plasma model of a chemical vapour deposition (CVD) reactor is\npresented for understanding spatial heteroepitaxial growth of polycrystalline\ndiamond on Si. This work is based on the TM0(n>1)p clamshell style reactor\n(Seki Dia…
Modelling microwave plasmas in Seki 6K style chemical vapour deposition diamond reactors Open
A microwave plasma model of a chemical vapour deposition (CVD) reactor is presented for understanding spatial heteroepitaxial growth of polycrystalline diamond on Si. This work is based on the TM0(n>1)p reactor (Seki Diamond 6K style) wher…
Electropositive Nanodiamond-Coated Quartz Microfiber Membranes for Virus and Dye Filtration Open
Electropositive membranes demonstrating high flux at low pressure differentials show great promise as universal separation platforms for viruses and other charged entities when centralized systems of water and power are scarce. However, th…
Air-clad suspended nanocrystalline diamond ridge waveguides Open
A hybrid group IV ridge waveguide platform is demonstrated, with potential application across the optical spectrum from ultraviolet to the far infrared wavelengths. The waveguides are fabricated by partial etching of sub-micron ridges in a…
Microwave Permittivity of Trace sp<sup>2</sup> Carbon Impurities in Sub-Micron Diamond Powders Open
Microwave dielectric loss tangent measurements \nare demonstrated as a method for quantifying trace \nsp2-hybridized carbon impurities in sub-micron diamond \npowders. Appropriate test samples are prepared by vacuum \nannealing at temperat…
Surface Zeta Potential and Diamond Seeding on Gallium Nitride Films Open
The measurement of ζ potential of Ga-face and N-face gallium nitride has been carried out as a function of pH. Both of the faces show negative ζ potential in the pH range 5.5-9. The Ga-face has an isoelectric point at pH 5.5. The N-face sh…
Spectroscopic Ellipsometry of Nanocrystalline Diamond Film Growth Open
With the retention of many of the unrivaled properties of bulk diamond but in thin-film form, nanocrystalline diamond (NCD) has applications ranging from micro-/nano-electromechanical systems to tribological coatings. However, with Young's…
Effect of slurry composition on the chemical mechanical polishing of thin diamond films Open
Nanocrystalline diamond (NCD) thin films grown by chemical vapour deposition have an intrinsic surface roughness, which hinders the development and performance of the films' various applications. Traditional methods of diamond polishing ar…