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Modulation of ZnO film thickness and formation of water-hyacinth nanostructure

Published online by Cambridge University Press:  12 August 2014

Ezhilarasan Gunasekaran ,
Prabakaran Shankar ,
Ganesh Kumar Mani  and
John Bosco Balaguru Rayappan
Ezhilarasan Gunasekaran
Affiliation:
Centre for Nanotechnology & Advanced Biomaterials (CeNTAB) and School of Electrical & Electronics Engineering (SEEE), SASTRA University, Thanjavur 613 401, Tamil Nadu, India
Prabakaran Shankar
Affiliation:
Centre for Nanotechnology & Advanced Biomaterials (CeNTAB) and School of Electrical & Electronics Engineering (SEEE), SASTRA University, Thanjavur 613 401, Tamil Nadu, India
Ganesh Kumar Mani
Affiliation:
Centre for Nanotechnology & Advanced Biomaterials (CeNTAB) and School of Electrical & Electronics Engineering (SEEE), SASTRA University, Thanjavur 613 401, Tamil Nadu, India
John Bosco Balaguru Rayappan*
Affiliation:
Centre for Nanotechnology & Advanced Biomaterials (CeNTAB) and School of Electrical & Electronics Engineering (SEEE), SASTRA University, Thanjavur 613 401, Tamil Nadu, India
*
ae-mail: [email protected]
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Abstract

The influence of precursor medium was investigated on the structural, morphological, optical and electrical properties of spray pyrolysis deposited nanostructured ZnO thin films. Three batches of ZnO thin films were deposited on glass substrates using three different solvents (water, water-ethanol [ratio of 1:1] and ethanol) based precursor solution of zinc nitrate hexahydrate. The substrate temperature was fixed at 523 K. The variation in film thickness from 150 to 875 nm was observed as the effect of changing solvent medium. X-ray diffraction (XRD) data confirmed the formation of polycrystalline ZnO thin films with hexagonal wurtzite crystallite structure and the estimated crystallite size was found to be ranging from 31 to 55 nm. Scanning electron micrographs revealed the formation of water-hyacinth shaped nanostructures when water-ethanol mixture was used as the solvent medium. Interestingly, UV-vis spectrophotometer revealed the formation of ZnO film with twin optical band gap of 3.15 eV and 3.56 eV when ethanol was used as the solvent medium. The modulation of film thickness and grain size by solvent medium has strongly influenced the electrical conductivity of ZnO thin films. The homogenous nano-spherical grains with uniform grain boundaries showed a good response towards 100 ppm of ammonia at room temperature.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 67 , Issue 2 , August 2014 , 20301
Copyright
© EDP Sciences, 2014

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