National Science Foundation Epitaxial VO 2 /TiO 2 heterostructure Integrated with Sapphire and Si(100) Substrates for multifunctional applications Jagdish.

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National Science Foundation Epitaxial VO 2 /TiO 2 heterostructure Integrated with Sapphire and Si(100) Substrates for multifunctional applications Jagdish Narayan, North Carolina State University, DMR Outcome: Epitaxial VO 2 thin films were deposited on m-sapphire, r-sapphire, and Si(100) substrates using TiO 2 buffer layers. Manipulating the out-of-plane orientation was achieved through altering the growth direction of TiO 2 films. Fig.1. 2Theta/Theta patterns of the VO 2 /TiO 2 heteroepitaxies grown on: (a) YSZ/Si, (b) m-sapphire, and (c) r-sapphire platforms. Impact: Strain free VO 2 epilayers with (101), (200), and (002) out-of-plane orientations were deposited on TiO 2 (101)/r-sapphire, TiO 2 (002)/m-sapphire, and TiO 2 (200)/cYSZ/Si(100) platforms, respectively. Tetragonal VO 2 phase was stabilized at room temperature giving rise to an semiconductor-to-metal transition close to room temperature. Epitaxial relationship across the interfaces were established. In all cases, a cube-on-cube growth at the VO 2 /TiO 2 interface was observed. A semiconductor-to-metal transition at about 28 o C with more than 4 orders of magnitude was observed for the VO 2 /TiO 2 /cYSZ/Si heteroepitaxy where the transition width was about 4.5 o C.

National Science Foundation Epitaxial VO 2 /TiO 2 heterostructure Integrated with Sapphire and Si(100) Substrates for multifunctional applications Jagdish Narayan, North Carolina State University, DMR Fig.2. Phi patterns of the VO 2 /TiO 2 heteroepitaxies grown on: (a) m-sapphire and (b) r-sapphire substrates. Growth of high quality epitaxial VO 2 films with low mosaicity is confirmed by the phi- scan patterns

National Science Foundation Educational Activities and Outreach Jagdish Narayan, North Carolina State University, DMR In less than three years, this program has graduated two very successfully employed PhDs, trained four undergraduates, and over fifteen papers in archival journals and equal number in conference proceedings, in addition to 2010 MRS Best Paper Award and several invited talks. Under PI’s leadership, NCSU launched M.S. degree course in Nanoengineering, where students from all over the world including minority (NCA&T and Shaw) institutions, can finish their degree, held very popular ASM Camp for high-school seniors, and transferred technology to Kopin Corporation. PI has also received 2012 Holladay Medal for pioneering contributions in research, teaching and extension, this is a highest faculty honor at NCSU. The MS&T 2011 International Symposium on Advances in nanostructured Materials and Applications (October 16-21, 2011, Columbus, Ohio) was dedicated to Professor Jay Narayan, The John Fan Family Distinguished Chair Professor, N C State University