Molybdenum Carbamate Nanosheets as a New Class of Potential Phase Change Materials.
basic_science · Level V
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- Record sourced from PubMed, PMID 28510441.
- Also identified by DOI 10.1021/acs.nanolett.7b01464.
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Abstract
We report for the first time the synthesis of large, free-standing, Mo<sub>2</sub>O<sub>2</sub>(μ-S)<sub>2</sub>(Et<sub>2</sub>dtc)<sub>2</sub> (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.