Growth of compact arrays of optical quality single crystalline ZnO nanorods by low temperature method |
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Authors: | Manoranjan Ghosh Ritwik Bhattacharyya A K Raychaudhuri |
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Affiliation: | (1) DST Unit for Nanoscience, S.N. Bose National Centre for Basic Sciences, Kolkata, 700 098, India |
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Abstract: | We report the synthesis and optical properties of compact and aligned ZnO nanorod arrays (dia, ∼ 50–200 nm) grown on a glass
substrate with varying seed particle density. The suspension of ZnO nanoparticles (size, ∼ 15 nm) of various concentrations
are used as seed layer for the growth of nanorod arrays via selfassembly of ZnO from solution. We studied the effect of various
growth parameters (such as seeding density, microstructure of the seed layer) as well as the growth time on the growth and
alignment of the nanorods. We find that the growth, areal density and alignment of the nanorods depend on the density of seed
particles which can be controlled. It is observed that there is a critical density of the seed particles at which nanorod
arrays show maximum preferred orientation along 002] direction. The minimum and maximum radius of the aligned nanorods synthesized
by this method lie in the range 50–220 nm which depend on the seeding density and time of growth. These nanorods have a bandgap
of 3.3 eV as in the case of bulk crystals and show emission in the UV region of the spectrum (∼ 400 nm) due to excitonic recombination
and defect related emission in the visible region. |
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Keywords: | ZnO nanorods density controlled growth preferred orientation |
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