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Cu-doped p-type ZnO films are grown on c-sapphire substrates by plasma-assisted molecular beam epitaxy. Photoluminescence (PL) experiments reveal a shallow acceptor state at 0.15 eV above the valence band edge. Hall effect results indicate that a growth condition window is found for the formation of p-type ZnO thin films, and the best conductivity is(More)
Electrically pumped random lasing based on an Au-ZnO nanowire Schottky junction diode is demonstrated. The device exhibits typical Schottky diode current-voltage characteristics with a turn-on voltage of 0.7 V. Electroluminescence characterization shows good random lasing behavior and the output power is about 67 nW at a drive current of 100 mA. Excitonic(More)
The chirality (n, m) of single walled carbon nanotubes (SWNTs) in the samples produced by alcohol catalytic CVD method on quartz substrate and by HiPco (High-pressure CO technique) process has been determined using the optical absorption spectra of the samples and the composition in the two samples has been compared. It has been found that, the average(More)
Understanding the flow fields at the micro-scale is key to developing methods of successfully mixing fluids for micro-scale applications. This paper investigates flow characteristics and mixing efficiency of three different geometries in micro-channels. The geometries of these channels were rectangular with a dimension of; 300 m wide, 100 m deep and 50 mm(More)
The Open University's repository of research publications and other research outputs Liquid phase pulsed laser ablation: a route to fabricate different carbon nanostructures Journal Article (2014). Liquid phase pulsed laser ablation: a route to fabricate different carbon nanostructures. Copyright and Moral Rights for the articles on this site are retained(More)
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