3 years ago

Size- and Interface-Modulated Metal–Insulator Transition in Solution-Synthesized Nanoscale VO2-TiO2-VO2 Heterostructures

Size- and Interface-Modulated Metal–Insulator Transition in Solution-Synthesized Nanoscale VO2-TiO2-VO2 Heterostructures
Xuefei Li, Raymond E. Schaak
The M1 form of vanadium dioxide, which exhibits a reversible insulator–metal transition above room temperature, has been incorporated into nanoscale heterostructures through solution-phase epitaxial growth on the tips of rutile TiO2 nanorods. Four distinct classes of VO2-TiO2-VO2 nanorod heterostructures are accessible by modulating the growth conditions. Each type of VO2-TiO2-VO2 nanostructure has a different insulator–metal transition temperature that depends on the VO2 domain sizes and the TiO2-VO2 interfacial strain characteristics. And then there were four! Four distinct classes of VO2-TiO2-VO2 heterostructures were synthesized by epitaxial solution-phase deposition of VO2 on the tips of TiO2 nanorods. Upon heating, the VO2 domains exhibit insulator–metal transitions, with temperatures that depend on the VO2 domain sizes and interfacial strain characteristics.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201706599

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