期刊
NANOSCALE RESEARCH LETTERS
卷 4, 期 7, 页码 699-704出版社
SPRINGER
DOI: 10.1007/s11671-009-9302-1
关键词
Aqueous chemical growth; Vertical nanowire; Nanogenerator; NEMS; Piezoelectricity; Rod-type photonic crystal
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Hungarian Fundamental Research Found (OTKA) [77578]
Highly uniform and c-axis-aligned ZnO nanorod arrays were fabricated in predefined patterns by a low temperature homoepitaxial aqueous chemical method. The nucleation seed patterns were realized in polymer and in metal thin films, resulting in, all-ZnO and bottom-contacted structures, respectively. Both of them show excellent geometrical uniformity: the cross-sectional uniformity according to the scanning electron micrographs across the array is lower than 2%. The diameter of the hexagonal prism-shaped nanorods can be set in the range of 90-170 nm while their typical length achievable is 0.5-2.3 mu m. The effect of the surface polarity was also examined, however, no significant difference was found between the arrays grown on Zn-terminated and on O-terminated face of the ZnO single crystal. The transmission electron microscopy observation revealed the single crystalline nature of the nanorods. The current-voltage characteristics taken on an individual nanorod contacted by a Au-coated atomic force microscope tip reflected Schottky-type behavior. The geometrical uniformity, the designable pattern, and the electrical properties make the presented nanorod arrays ideal candidates to be used in ZnO-based DC nanogenerator and in next-generation integrated piezoelectric nano-electromechanical systems (NEMS).
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