Controllable synthesis of SnO2 nanowires and nanobelts by Ga catalysts

We report the morphology control of one-dimensional (1D) SnO2 nanostructures by Ga catalysts using thermal evaporation method. Gallium (Ga), either from decomposition of GaN powder or from Ga metal, is adopted as a catalyst for the growth of long SnO2 nanowires and nanobelts. At similar experimental conditions, quantities of nanobelts are formed instead of nanowires when the temperature and reaction time are increased. Such approach enables us to synthesize various morphologies of SnO2 nanobelts with different side facets. Novel nanobelts with [0 0 1] growth direction with high energy side facets are obtained for the first time, which is attributed to the large amount of oxygen vacancies introduced in the nanobelts by the Ga catalysts.

Graphical abstractMorphology control of one-dimensional SnO2 nanostructures are realized via a thermal evaporation method. Novel nanobelts along [0 0 1] direction having high energy side facets were fabricated for the first time.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Morphology control of one-dimensional SnO2 nanostructures are realized by Ga catalysts using thermal evaporation method. ► Oxygen vacancies influenced the growth directions in order to neutralize thermodynamic instability. ► Novel nanobelts with [0 0 1] growth direction with high energy side facets are obtained for the first time.