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Unraveling the growth mechanism of W18O49 nanowires on W surfaces
Ist Teil von
CrystEngComm, 2021-10, Vol.23 (37), p.6559-6566
Ort / Verlag
Cambridge: Royal Society of Chemistry
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Understanding the growth mechanism is crucial for controlling the morphology and further designing efficient nanostructured materials. Non-stoichiometric tungsten oxides, in particular, W18O49 nanostructures have shown their prominence for various functional applications. This work presents the growth mechanism of W18O49 nanowires on W surfaces under H2O(v) atmosphere. The phase evolutions are unfolded in view of the detailed thermodynamic considerations. The reaction between W and H2O(v) produces WO3 along with H2 as a by-product. H2 acts as a reductant for WO3 and facilitates the W18O49 phase formation. The complete crystallographic relation of the phase transformation could be represented as W(110)//WO3(010)//W18O49(010). The oxygen vacancy-induced planar defects are responsible for the 1d [010] growth of W18O49 NWs. The hexagonal tunnels along the NW length create a passage for H2O(v) to repeat the reaction and increase the NW length.