tailieunhanh - Báo cáo hóa học: " Highly Uniform Epitaxial ZnO Nanorod Arrays for Nanopiezotronics"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Highly Uniform Epitaxial ZnO Nanorod Arrays for Nanopiezotronics | Nanoscale Res Lett 2009 4 699-704 DOI S11671-009-9302-1 NANO EXPRESS Highly Uniform Epitaxial ZnO Nanorod Arrays for Nanopiezotronics J. Volk T. Nagata R. Erdelyi I. Barsony A. L. Tilth I. E. Lukacs Zs. Czigany H. Tomimoto Y. Shingaya T. Chikyow Received 14 January 2009 Accepted 24 March 2009 Published online 7 April 2009 to the authors 2009 Abstract 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 90170 nm while their typical length achievable is 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 . J. Volk H R. Erdelyi I. Barsony A. L. Toth I. E. Lukács Zs. Czigany Research Institute for Technical Physics and Materials Science Konkoly Thege Miklos tit 29-33 1121 Budapest Hungary e-mail volk@ J. Volk T. Nagata H. Tomimoto Y. Shingaya T. Chikyow National Institute for Materials Science 1-1 Namiki Tsukuba Ibaraki .