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In this contribution, an effective method has been proposed to modulate the band gap of ZnO single-wall nanotube (SWNT). By adjusting the doping Cu concentration and the concentration gradient, the band gap can vary from 4.5eV of the perfect ZnO SWNT to 1.95eV. When the Cu concentration is fixed, the band gap decreases as concentration gradient decreases. Similarly, with the fixed concentration gradient,...
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