Chemistry

Tin Oxide Diskettes

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Science  12 Jul 2002:
Vol. 297, Issue 5579, pp. 159
DOI: 10.1126/science.297.5579.159c

The controlled synthesis of a variety of nanosized objects has been reported for several oxide materials. For tin oxide, there have been previous reports on the synthesis of nanoscale tubes, wires, and ribbons. Dai et al. report on the preparation of single-crystalline disks, starting from either SnO or SnO2; the disks formed at temperatures between 200° and 400°C and had a final composition of SnO. Two morphologies were observed: Two solid “wheels” fused together to form a drop-center rim, or a cone-like structure formed from a main disk and a series of spiral-stepped ridges. The latter morphology is thought to be produced by the presence of impurities during the growth cycle. During a subsequent annealing step, the disks oxidized through a complex transformation process, with Sn3O4 observed as an intermediate oxide material, and became polycrystalline. — MSL

J. Am. Chem. Soc., 10.1021/ja026262d (2002).

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