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An investigation into the conversion of In 2 O 3 into InN nanowires

An investigation into the conversion of In 2 O 3 into InN nanowires,10.1186/1556-276X-6-311,Nanoscale Research Letters,Polina Papageorgiou,Matthew Zer

An investigation into the conversion of In 2 O 3 into InN nanowires  
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Straight In2O3 nanowires (NWs) with diameters of 50 nm and lengths ≥2 μm have been grown on Si(001) via the wet oxidation of In at 850°C using Au as a catalyst. These exhibited clear peaks in the X-ray diffraction corresponding to the body centred cubic crystal structure of In2O3 while the photoluminescence (PL) spectrum at 300 K consisted of two broad peaks, centred around 400 and 550 nm. The post-growth nitridation of In2O3 NWs was systematically investigated by varying the nitridation temperature between 500 and 900°C, flow of NH3 and nitridation times between 1 and 6 h. The NWs are eliminated above 600°C while long nitridation times at 500 and 600°C did not result into the efficient conversion of In2O3 to InN. We find that the nitridation of In2O3 is effective by using NH3 and H2 or a two-step temperature nitridation process using just NH3 and slower ramp rates. We discuss the nitridation mechanism and its effect on the PL.
Journal: Nanoscale Research Letters - NANOSCALE RES LETT , vol. 6, no. 1, pp. 1-5, 2011
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