Growth of compact arrays of optical quality single crystalline ZnO nanorods by low temperature method

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.

Polyaniline‐Wrapped ZnO Nanorod Composite Films on Diazonium‐Modified Flexible Plastic Substrates

“…The growth process has been achieved in two steps according to the method described in references. [ 77,78 ] Typically, BOPET sheets were padded in ethanol solution containing 50 × 10 −3 M zinc acetate dihydrate for 30 min under vigorous stirring in order to ensure a prompt attachment of ZnO on para-amino benzoic acid modifi ed substrate surface. Subsequently, 100 × 10 −3 M NaOH solution in ethanol were slowly added to form Zn(OH) 2 precipitation.…”

Photovoltaic Properties Of ZnO Nanoparticle Based Solid Polymeric Photoelectrochemical Cells

“…ZnO NPs of size ~15 nm have been synthesized by acetate route described elsewhere. 8,9 Films of ZnO NP having thickness ~1.2 and ~0.25 µm are obtained by adding NP dispersion in ethanol on a pre-decided area of a commercially available conducting ITO layer supported by a glass substrate. The ZnO dispersion has been spread over the surface uniformly and dried at room temperature.…”

Enhanced ultraviolet electroluminescence from ZnO nanowires in TiO2/ZnO coaxial nanowires/poly(3,4-ethylenedioxythiophene)-poly(styrene-sulfonate) heterojunction

“…1͑d͒, several diffraction peaks can be observed at 2 = 31.74°, 34.44°, 36.26°, 47.48°, 56.66°, and 62.93°, which corresponds with ZnO ͑100͒, ͑002͒, ͑101͒, ͑102͒, ͑110͒, and ͑103͒, respectively. 17 Each peak can be indexed to hexagonal ZnO ͑Joint Committee for Powder Diffraction Standard card No. 36-1451͒.…”