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An investigation into the conversion of In2O3 into InN nanowires.

Papageorgiou P, Zervos M, Othonos A - Nanoscale Res Lett (2011)

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Nanostructured Materials and Devices Laboratory, Department of Mechanical Engineering, Materials Science Group, School of Engineering, University of Cyprus, P,O, Box 20537, Nicosia, 1678, Cyprus. zervos@ucy.ac.cy.

ABSTRACT
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.

No MeSH data available.


PL spectrum of In2O3 NWs as grown and after nitridation using NH3 only or NH3 and H2.
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Figure 3: PL spectrum of In2O3 NWs as grown and after nitridation using NH3 only or NH3 and H2.

Mentions: The PL spectrum following excitation at 267 nm at 300 K consisted of two broad peaks, centred at 400 and 550 nm as shown in Figure 3 Similar peaks in the PL have been observed by Yan et al. [11] who obtained a broad luminescence band centred at 395 nm from In2O3 nanorods, Liang et al. [12] who found a peak at 470 nm from In2O3 nanofibres and Wu et al. [13] who observed two distinct peaks at 416 and 435 nm from In2O3 nanowires. It is important to point out that these peaks are commonly attributed to the presence of oxygen vacancies.


An investigation into the conversion of In2O3 into InN nanowires.

Papageorgiou P, Zervos M, Othonos A - Nanoscale Res Lett (2011)

PL spectrum of In2O3 NWs as grown and after nitridation using NH3 only or NH3 and H2.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211398&req=5

Figure 3: PL spectrum of In2O3 NWs as grown and after nitridation using NH3 only or NH3 and H2.
Mentions: The PL spectrum following excitation at 267 nm at 300 K consisted of two broad peaks, centred at 400 and 550 nm as shown in Figure 3 Similar peaks in the PL have been observed by Yan et al. [11] who obtained a broad luminescence band centred at 395 nm from In2O3 nanorods, Liang et al. [12] who found a peak at 470 nm from In2O3 nanofibres and Wu et al. [13] who observed two distinct peaks at 416 and 435 nm from In2O3 nanowires. It is important to point out that these peaks are commonly attributed to the presence of oxygen vacancies.

Bottom Line: 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.

View Article: PubMed Central - HTML - PubMed

Affiliation: Nanostructured Materials and Devices Laboratory, Department of Mechanical Engineering, Materials Science Group, School of Engineering, University of Cyprus, P,O, Box 20537, Nicosia, 1678, Cyprus. zervos@ucy.ac.cy.

ABSTRACT
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.

No MeSH data available.