We report the success of controlled synthesis of freestanding ZnO nanobelts whose surfaces are dominated by the large polar surfaces. The nanobelts grow along the - axis, their large top/bottom surfaces are the /spl plusmn/(0001) polar planes, and the side surfaces are (01 | 0). Owing to the positive and negative ionic charges on the zinc- and oxygen-terminated /spl plusmn/(0001) surfaces, respectively, the nanobelts form multi-loops of nanohelixes/nanosprings for the sake of reducing electrostatic energy introduced by the polar surfaces. The polar surface dominated ZnO nanobelts/nanohelixes are likely to be useful building blocks for nanodevices in MHMS/NEMS or biosensors.
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