Confocal Raman microscopy across the metal-insulator transition of single vanadium dioxide nanoparticles.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 19199760.
- Also identified by DOI 10.1021/nl8031839.
- No licence information is recorded for this record.
- Because redistribution is not established, this page shows the abstract only. Follow the links below for the full text.
Abstract
We present the first Raman scattering measurements on nanoparticulate vanadium dioxide (VO(2)), as well as the first observations of the temperature-induced phase transition in individual VO(2) nanoparticles (NPs). We compare the Raman response of two VO(2) NPs and a companion VO(2) film undergoing their monoclinic-tetragonal-monoclinic transformations and offer qualitative explanations for the large observed differences in hysteresis width. While bulk crystals and contiguous films contain numerous nucleation sites, individual NPs likely harbor only a few, which may make it possible to correlate detectable defects (e.g., grain boundaries and dislocations) with the "ease" of switching phases, as quantified by the width of the thermal hysteresis.