In comparison with that of the bulk Ge crystals, the nanocrystalline Ge show a blue shift of energy and the optical band gap increases with decreasing of the particle size of the nanocrystallites.
研究表明：镶嵌在绝缘介质薄膜中的纳米锗颗粒的能带是量子化的，随着纳米锗粒子平均尺寸的减小，其吸收带隙增加，吸收带边蓝移的程度相应增大。
The optical band gap between nano-TiO 2 energy band and conduction band is3.
纳米二氧化钛能带和导带之间的带隙能为3。
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