Fabrication of Optically Enhanced ZnO Nanorods and Microrods Using Novel Biocatalysts
Authors: Kumar, Nitin; Dorfman, Adam; Hahm, Jong-in
Source: Journal of Nanoscience and Nanotechnology, Volume 5, Number 11, November 2005 , pp. 1915-1918(4)
Publisher: American Scientific Publishers
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Abstract:
We developed a straightforward method to produce hexagonal ZnO nanorods and microrods using a novel biocatalyst, Magnetospirillum magnetotacticum. ZnO nanorods were synthesized homogeneously on growth substrates when the bacterial catalysts were deposited uniformly on substrates whereas ZnO microrods were formed when the catalysts were introduced to selective areas of growth substrates using microcontact printing. X-ray diffraction measurements reveal that these ZnO structures exhibit Wurtzite structures with preferential growth along [0001] direction. Room-temperature photoluminescence spectra of the as-synthesized ZnO nanorods and microrods show extremely strong and sharp UV emission at 390nm and negligible green emission at 510nm. Our results demonstrate that Magnetospirillum magnetotacticum is an effective catalyst for the growth of nanometerand micrometer-sized ZnO structures with exceptionally high-quality optical properties. These defect-free ZnO nano-and micro-materials, when combined with microcontact printing techniques to achieve patterned growth over large areas of substrates, can facilitate their photonic-based applications as optoelectronic devices and chemical/biological sensors.Keywords: ZINC OXIDE NANOROD; ZINC OXIDE MICROROD; MAGNETOSPIRILLUM MAGNETOTACTICUM; MICROPATTERNING; SEMICONDUCTOR NANOMATERIAL
Document Type: Short communication
DOI: 10.1166/jnn.2005.422
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