1. Molybdenum Carbamate Nanosheets as a New Class of Potential Phase Change Materials.
- Author
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Zhukovskyi, Maksym, Plashnitsa, Vladimir, Petchsang, Nattasamon, Anthony Ruth, Bajpai, Anshumaan, Vietmeyer, Felix, Yuanxing Wang, Brennan, Michael, Yunsong Pang, Werellapatha, Kalpani, Bunker, Bruce, Chattopadhyay, Soma, Tengfei Luo, Janko, Boldizsar, Patrick Fay, and Masaru Kuno
- Subjects
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MOLYBDENUM compounds , *PHASE change materials , *ELECTRON beams , *CHEMICAL potential , *FEMTOSECOND lasers - Abstract
We report for the first time the synthesis of large, free-standing, Mo2O2(μ-S)2(Et2dtc)2 (MoDTC) nanosheets (NSs), which exhibit an electron-beam induced crystalline-to-amorphous phase transition. Both electron beam ionization and femtosecond (fs) optical excitation induce the phase transition, which is size-, morphology-, and composition-preserving. Resulting NSs are the largest, free-standing regularly shaped two-dimensional amorphous nanostructures made to date. More importantly, amorphization is accompanied by dramatic changes to the NS electrical and optical response wherein resulting amorphous species exhibit room-temperature conductivities 5 orders of magnitude larger than those of their crystalline counterparts. This enhancement likely stems from the amorphization-induced formation of sulfur vacancy-related defects and is supported by temperature-dependent transport measurements, which reveal efficient variable range hopping. MoDTC NSs represent one instance of a broader class of transition metal carbamates likely having applications because of their intriguing electrical properties as well as demonstrated ability to toggle metal oxidation states. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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