Journal
CRYSTAL GROWTH & DESIGN
Volume 5, Issue 3, Pages 1079-1083Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cg049644z
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Hierarchically structured porous particles and films consisting of nanocrystalline SnO2 were spontaneously grown by gradual oxidation of tin(II) in a simple aqueous system at a low temperature. The nanoscale shape and macroscopically assembled architecture of SnO2 crystallites were totally controlled by preparation conditions for crystal growth. Spherical and prickly particles exhibiting a high specific surface area in the range of 120-230 m(2)/g were produced by organized growth of nanoscale SnO2 grains and flakes, respectively. Porous SnO2 films consisting of the nanograins and nanoflakes were directly grown on a glass substrate through heterogeneous nucleation promoted by addition of urea. Cellular aggregates and films composed of platy subunits were constructed in the solutions under an oxygen-deficient condition. Amorphous and monoxide phases contained in as-deposited particles and films were easily transformed into SnO2 crystals without deformation of the macroscopic architecture by subsequent hydrothermal treatment at 150 degrees C in water and calcination at 500 degrees C in air, respectively. The easyto-handle nanocrystalline SnO2 with hierarchical and porous architectures would be utilized for various practical applications.
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