Epitaxy-enabled vapor-liquid-solid growth of tin-doped indium oxide nanowires with controlled orientations
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Materials Science and Engineering Program
KAUST Solar Center (KSC)
Laboratory of Nano Oxides for Sustainable Energy
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AbstractControlling the morphology of nanowires in bottom-up synthesis and assembling them on planar substrates is of tremendous importance for device applications in electronics, photonics, sensing and energy conversion. To date, however, there remain challenges in reliably achieving these goals of orientation-controlled nanowire synthesis and assembly. Here we report that growth of planar, vertical and randomly oriented tin-doped indium oxide (ITO) nanowires can be realized on yttria-stabilized zirconia (YSZ) substrates via the epitaxy-assisted vapor-liquid-solid (VLS) mechanism, by simply regulating the growth conditions, in particular the growth temperature. This robust control on nanowire orientation is facilitated by the small lattice mismatch of 1.6% between ITO and YSZ. Further control of the orientation, symmetry and shape of the nanowires can be achieved by using YSZ substrates with (110) and (111), in addition to (100) surfaces. Based on these insights, we succeed in growing regular arrays of planar ITO nanowires from patterned catalyst nanoparticles. Overall, our discovery of unprecedented orientation control in ITO nanowires advances the general VLS synthesis, providing a robust epitaxy-based approach toward rational synthesis of nanowires. © 2014 American Chemical Society.
SponsorsThis work was supported in part by Singapore National Research Foundation, King Abdullah University of Science and Technology (KAUST), and European Union Seventh Framework Programme under Grant 312483 - ESTEEM2 (Integrated Infrastructure Initiative-I3). S.T. acknowledges the fund for scientific research Flanders (FWO) under the form of postdoctoral fellowship and for projects G004613N and G004413N. P.Y. is supported by SSLS via the NUS Core Support C-380-003-003-001.
PublisherAmerican Chemical Society (ACS)