Abstract
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 m2/g were produced by organized growth of nanoscale SnO 2 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°C in water and calcination at 500°C in air, respectively. The easy-to-handle nanocrystalline SnO 2 with hierarchical and porous architectures would be utilized for various practical applications.
| Original language | English |
|---|---|
| Pages (from-to) | 1079-1083 |
| Number of pages | 5 |
| Journal | Crystal Growth and Design |
| Volume | 5 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2005 May 1 |
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics