Kolibal, M, Novak, L, Shanley, T, Toth, M & Sikola, T 2016, 'Silicon oxide nanowire growth mechanisms revealed by real-time electron microscopy', NANOSCALE, vol. 8, no. 1, pp. 266-275.View/Download from: Publisher's site
Shanley, TW, Bonnie, F, Scott, J & Toth, M 2016, 'Role of gas molecule complexity in environmental electron microscopy and photoelectron yield spectroscopy.', ACS applied materials & interfaces, vol. 8, pp. 27305-27310.View/Download from: Publisher's site
Environmental scanning electron microscopy (ESEM) and environmental photoelectron yield spectroscopy (EPYS) enable electron imaging and spectroscopy of surfaces and interfaces in low vacuum, gaseous environments. The techniques are both appealing and limited by the range of gases that can be used to amplify electrons emitted from a sample, and used to form images/spectra. However, to date, only H2O and NH3 gases have been identified as highly favorable electron amplification media. Here we demonstrate that ethanol vapor (CH3CH2OH) is superior to both of these, and attribute its performance to molecular complexity and valence orbital structure. Our findings improve present understanding of what constitutes a favorable electron amplification gas, and will help expand the applicability and usefulness of the ESEM and EPYS techniques.
Shanley, TW, Martin, AA, Aharonovich, I & Toth, M 2014, 'Localized chemical switching of the charge state of nitrogen-vacancy luminescence centers in diamond', APPLIED PHYSICS LETTERS, vol. 105, no. 6.View/Download from: Publisher's site
Lanthanides are vital components in lighting, imaging technologies and future quantum memory applications owing to their narrow optical transitions and long spin coherence times. Recently, diamond has become a pre-eminent platform for the realisation of many experiments in quantum information science. Here we demonstrate a promising approach to incorporate Eu ions into diamond, providing a means to harness the exceptional characteristics of both lanthanides and diamond in a single material. Polyelectrolytes are used to electrostatically assemble Eu(III) chelate molecules on diamond and subsequently chemical vapour deposition is employed for the diamond growth. Fluorescence measurements show that the Eu atoms retain the characteristic optical signature of Eu(III) upon incorporation into the diamond lattice. Computational modelling supports the experimental findings, corroborating that Eu(III) in diamond is a stable configuration. The formed defects demonstrate the outstanding chemical control over the incorporation of impurities into diamond enabled by the electrostatic assembly together with chemical vapour deposition growth.