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  • NRN150 - Surface inititiated growth of copper using isonicotinic acid functionalized aluminum oxide surfaces

    Journal of Coatings Technology and Research

    • Materials

    Isonicotinate self-assembled monolayers (SAM) were prepared on alumina surfaces (A) using isonicotinic acid (iNA). These functionalized layers (iNA-A) were used for the seeded growth of copper films (Cu-iNA-A) by hydrazine hydrate-initiated electroless deposition. The films were characterized by scanning electron microscopy (SEM), electron-dispersive X-ray spectroscopy, atomic force microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and advancing contact angle measurements. The films are Cu0 but with surface oxidation, and show a faceted morphology, which is more textured (Rq = 460 ± 90 nm) compared to the SAM (Rq = 2.8 ± 0.5 nm). In contrast, growth of copper films by SnCl2/PdCl2 catalyzed electroless deposition, using formaldehyde (CH2O) as the reducing agent, shows a nodular morphology on top of a relatively smooth surface. No copper films are observed in the absence of the isonicotinate SAM. The binding of Cu2+ to the iNA is proposed to facilitate reduction to Cu0 and create the seed for subsequent growth. The films show good adhesion to the functionalized surface.

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  • NRN062 The separated electric and magnetic field responses of luminescent bacteria exposed to pulsed microwave irradiation

    Applied Physics Letters

    • Sensors and Devices, 
    • Knowledge Transfer

    NRN Researchers have recently discovered the effects electric fields of microwaves have upon a living organism, Vibro Fisheri. The discovery has opened up the question as to what effect these transmissions, emitted by mobile and wifi devices, could be posing to our health.

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  • NRNC20 Probabilistic wind power forecasting and its application in the scheduling of gas-fired generators

    Science Direct

    • Sensors and Devices, 
    • Modelling, 
    • Knowledge Transfer, 
    • Materials

    This paper presents a methodology for producing wind power forecast scenarios. Using historical wind power time series data and the Kernel Density Estimator (KDE), probabilistic wind power forecast scenarios were generated according to a rolling process.

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  • NRN105 - CO2 laser micromachining of nanocrystalline diamond films grown on doped silicon substrates

    The Optical Society

    • Sensors and Devices, 
    • Modelling, 
    • Knowledge Transfer, 
    • Materials

    We demonstrate that nanocrystalline diamond films grown on highly doped silicon substrates can be patterned using a CO2 laser operating at a wavelength of 10.6 μm, where both low doped silicon and diamond exhibit negligible optical absorption. The patterning is initiated by free carrier absorption in the silicon substrate and further enhanced by the thermal runaway effect, which results in surface heating in the silicon substrate and subsequent thermal ablation of the diamond film in an oxygen rich atmosphere. Using this approach, micron-scale grating and dot patterns are patterned in thin film diamond. The localized heating is simulated and analyzed using concurrent optical and thermal finite element modelling. The laser patterning method described here offers a cost effective and rapid solution for micro-structuring diamond films.

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  • NRN106-A computational framework for large strain nearly and truly incompressible electromechanics based on convex multi-variable strain energies

    Science Direct

    • Modelling, 
    • Knowledge Transfer, 
    • Materials

    The series of papers published by Gil and Ortigosa (Gil and Ortigosa, 2016; Ortigosa and Gil, 2016, 0000) introduced a new convex multi-variable variational and computational framework for the numerical simulation of Electro Active Polymers (EAPs) in scenarios characterised by extreme deformations and/or extreme electric fields. Building upon this body of work, five key novelties are incorporated in this paper.