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Start Over Author "Schaak, Raymond E." Journal angewandte chemie
19 results on '"Schaak, Raymond E."'

4. Low‐Temperature Solution Synthesis of Few‐Layer 1T ′‐MoTe 2 Nanostructures Exhibiting Lattice Compression

Author

Sun, Yifan, primary, Wang, Yuanxi, additional, Sun, Du, additional, Carvalho, Bruno R., additional, Read, Carlos G., additional, Lee, Chia‐hui, additional, Lin, Zhong, additional, Fujisawa, Kazunori, additional, Robinson, Joshua A., additional, Crespi, Vincent H., additional, Terrones, Mauricio, additional, and Schaak, Raymond E., additional

Published
2016
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5. Size- and Interface-Modulated Metal-Insulator Transition in Solution-Synthesized Nanoscale VO2-TiO2-VO2 Heterostructures.

Author

Li, Xuefei and Schaak, Raymond E.

Subjects
*METAL-insulator transitions, *SOLUTION (Chemistry), *NANOSTRUCTURED materials synthesis, *VANADIUM oxide, *TITANIUM dioxide, *HETEROSTRUCTURES
Abstract

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. [ABSTRACT FROM AUTHOR]

Published
2017
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10. Low-Temperature Solution Synthesis of Few-Layer 1T ′-MoTe2 Nanostructures Exhibiting Lattice Compression.

Author

Sun, Yifan, Wang, Yuanxi, Sun, Du, Carvalho, Bruno R., Read, Carlos G., Lee, Chia ‐ hui, Lin, Zhong, Fujisawa, Kazunori, Robinson, Joshua A., Crespi, Vincent H., Terrones, Mauricio, and Schaak, Raymond E.

Subjects
NANOSTRUCTURES, TRANSITION metals, CRYSTAL grain boundaries, RAMAN spectra, PHOTOVOLTAIC power generation, OPTOELECTRONIC devices
Abstract

Molybdenum ditelluride, MoTe2, is emerging as an important transition-metal dichalcogenide (TMD) material because of its favorable properties relative to other TMDs. The 1T ′ polymorph of MoTe2 is particularly interesting because it is semimetallic with bands that overlap near the Fermi level, but semiconducting 2H-MoTe2 is more stable and therefore more accessible synthetically. Metastable 1T ′-MoTe2 forms directly in solution at 300 °C as uniform colloidal nanostructures that consist of few-layer nanosheets, which appear to exhibit an approx. 1 % lateral lattice compression relative to the bulk analogue. Density functional theory calculations suggest that small grain sizes and polycrystallinity stabilize the 1T ′ phase in the MoTe2 nanostructures and suppress its transformation back to the more stable 2H polymorph through grain boundary pinning. Raman spectra of the 1T ′-MoTe2 nanostructures exhibit a laser energy dependence, which could be caused by electronic transitions. [ABSTRACT FROM AUTHOR]

Published
2016
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19. Hybrid CuO‐TiO2−xNxHollow Nanocubes for Photocatalytic Conversion of CO2into Methane under Solar Irradiation

Author

In, Su‐Il, Vaughn, Dimitri D., and Schaak, Raymond E.

Abstract

Kubische Methanproduzenten: Hohle CuO‐TiO2−xNx‐Hybridnanowürfel wurden durch Abscheidung von TiO2auf Cu3N‐Nanowürfeltemplaten und anschließendes Erhitzen an Luft synthetisiert, um Cu3N zu CuO zu oxidieren und zugleich Stickstoff in TiO2zu inkorporieren. Das nanostrukturierte CuO‐TiO2−xNx‐Material wirkt unter Sonnenbestrahlung als Photokatalysator für die Umwandlung von CO2in Methan.

Published
2012
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