Zao Yang et al 2008 Nanotechnology 19 035704 doi:10.1088/0957-4484/19/03/035704
Zao Yang, QuanHui Liu, HongChun Yu, Binsuo Zou, YanGuo Wang and T H Wang1
Show affiliationsZnO nanorod close-packed arrays are successfully fabricated in a substrate-free manner by a citric acid assisted annealing process at a low growth temperature of 400 °C. Each nanorod of ZnO nanorod close-packed arrays grows along the [0001] direction and is single crystalline with an average diameter of 50 nm, and an average length of 0.5 µm. The aspect ratio is 10. The ZnO nanorod close-packed arrays show a strong exciton absorption peak at 372 nm in UV–visible absorption spectra, exhibiting a blue-shift relative to the bulk exciton absorption (387 nm). Finally, a new growth mechanism is proposed for the substrate-free preparation of ZnO nanorod close-packed arrays by a citric acid assisted annealing process.
81.16.-c Methods of nanofabrication and processing
78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
81.07.-b Nanoscale materials and structures: fabrication and characterization
Condensed matter: electrical, magnetic and optical
Issue 3 (23 January 2008)
Received 16 June 2007, in final form 22 September 2007
Published 11 December 2007
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