Journal
NANOMATERIALS
Volume 13, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/nano13101627
Keywords
gamma alumina; nonthermal plasma; size-control
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Here, we report a single-step synthesis of size-controlled and monodisperse, facetted ?-Al2O3 nanocrystals in an inductively coupled nonthermal plasma reactor using trimethylaluminum and oxygen as precursors, achieving phase-pure, cuboctahedral ?-Al2O3 nanocrystals with defined surface facets. Nuclear magnetic resonance studies revealed that nanocrystal surfaces are populated with AlO6, AlO5 and AlO4 units with clusters of hydroxyl groups. Nanocrystal size tuning was achieved by varying the total reactor pressure yielding particles as small as 3.5 nm, below the predicted thermodynamic stability limit for ?-Al2O3.
Gamma alumina (?-Al2O3) is widely used as a catalyst and catalytic support due to its high specific surface area and porosity. However, synthesis of ?-Al2O3 nanocrystals is often a complicated process requiring high temperatures or additional post-synthetic steps. Here, we report a single-step synthesis of size-controlled and monodisperse, facetted ?-Al2O3 nanocrystals in an inductively coupled nonthermal plasma reactor using trimethylaluminum and oxygen as precursors. Under optimized conditions, we observed phase-pure, cuboctahedral ?-Al2O3 nanocrystals with defined surface facets. Nuclear magnetic resonance studies revealed that nanocrystal surfaces are populated with AlO6, AlO5 and AlO4 units with clusters of hydroxyl groups. Nanocrystal size tuning was achieved by varying the total reactor pressure yielding particles as small as 3.5 nm, below the predicted thermodynamic stability limit for ?-Al2O3.
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