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Non-quantum electronic responses of zinc oxide nanomaterials

机译：氧化锌纳米材料的非量子电子响应

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The influence of the high surface-to-volume ratio of ZnO nanomaterials, whose sizes are large enough to exclude the quantum effect, on electronic properties was investigated by spatially resolved valence electron energy loss spectroscopy. ZnO nanowires, nanoplates, and nanotubes with different sizes were fabricated and characterized. Both the reduced volume and the increased surface area of the large ZnO nanomaterials were found to be able to modify electronic properties significantly. Hence, a nanoplate and a nanotube with very small volumes show unique energy loss functions and dielectric functions different from those of bulk ZnO at all the probe points. On the other hand, a nanowire with a relatively large diameter (70 nm) has electronic properties similar to those of bulk ZnO at the center. However, they are dissimilar at the edge of the nanowire due to the component of surface parallel to the electron path and the reduced interaction volume. Moreover, some interband transitions shift positions and bulk plasmons change oscillator strength depending upon the size of the volume and the geometry of the surface. These empirical results demonstrate that semiconducting nanomaterials larger than the exciton Bohr radius can still behave differently from bulk materials due to the high ratio between surface area and volume.
机译：通过空间分辨价电子能量损失谱研究了高表面积体积比的ZnO纳米材料的高表面体积比对电子性能的影响。制备并表征了不同尺寸的ZnO纳米线，纳米板和纳米管。发现大型ZnO纳米材料的减小的体积和增大的表面积均能够显着改变电子性能。因此，体积很小的纳米板和纳米管在所有探针点上都具有独特的能量损失功能和介电功能，与块状ZnO不同。另一方面，具有相对较大直径（70nm）的纳米线具有与中心的块状ZnO相似的电子性质。但是，由于与电子路径平行的表面成分和减少的相互作用体积，它们在纳米线的边缘不相同。此外，一些带间过渡会改变位置，体等离子体激元会根据体积的大小和表面的几何形状改变振荡器的强度。这些经验结果表明，由于表面积和体积之比高，大于激子玻尔半径的半导体纳米材料的性能仍与块状材料不同。

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    《Nanotechnology》 |2013年第11期|共10页
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    Kim H.; Kim Y.;

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