Synthesis of low-melting metal oxide and sulfide nanowires and nanobelts |
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Authors: | R Rao H Chandrasekaran S Gubbala M K Sunkara C Daraio S Jin A M Rao |
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Affiliation: | (1) Department of Physics and Astronomy, Clemson University, 29634 Clemson, SC;(2) Department of Chemical Engineering, University of Louisville, 40292 Louisville, KY;(3) Department of Materials Science, University of California-San Diego, 92093 La Jolla, CA |
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Abstract: | The bulk nucleation and basal growth of semiconducting nanowires from molten Ga pools has been demonstrated earlier using
oxygen/hydrogen plasma over molten Ga pools. Herein, we extend the above concept for bulk synthesis of oxide and sulfide nanowires
of low-melting metal melts such as Sn and In. Specifically, nanowires of β-Ga2O3, β-In2O3, SnO2, α-Ga2S3, and β-In2S3 were synthesized using direct reactions between respective molten metal pools and the gases such as oxygen/hydrogen mixture
for oxides and H2S for sulfides. In the case of β-Ga2O3 and SnO2, a change in the morphology from nanowires to nanobelts was observed with an increase in the synthesis temperature. No such
behavior was observed in the case of β-In2O3. Furthermore, we present evidence for α-Ga2S3 nanowires, which to our knowledge is being reported for the first time in the literature. Our studies with the sulfide nanowires
suggest that H2S reacts directly at the molten metal surface to form gallium sulfide. Finally, we discuss the role of chamber pressure and
hydrogen on the size distribution of nanostructured β-Ga2O3 and SnO2. |
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Keywords: | Nanowires nanobelts Raman |
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