2009 review

Nucleation and growth mechanism for flame synthesis of MoO2 hollow microchannels with nanometer wall thickness

[Review of ]. MICRON, 40(8), 821–826.

co-author countries: United States of America 🇺🇸
author keywords: Microstructures; Nanostructures; Metal oxides; Flame synthesis; Growth mechanism
Source: Web Of Science
Added: August 6, 2018

The growth and morphological evolution of molybdenum-oxide microstructures formed in the high temperature environment of a counter-flow oxy-fuel flame using molybdenum probes is studied. Experiments conducted using various probe retention times show the sequence of the morphological changes. The morphological row begins with micron size objects exhibiting polygonal cubic shape, develops into elongated channels, changes to large structures with leaf-like shape, and ends in dendritic structures. Time of probe–flame interaction is found to be a governing parameter controlling the wide variety of morphological patterns; a molecular level growth mechanism is attributed to their development. This study reveals that the structures are grown in several consecutive stages: material “evaporation and transportation”, “transformation”, “nucleation”, “initial growth”, “intermediate growth”, and “final growth”. XRD analysis shows that the chemical compositions of all structures correspond to MoO2.