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ZnO Nanostructures – Nanorods and Flower-Like on Si/Au Substrates by Solution-Immersion Method in Different pH of Precursor

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Abstract:

Low-temperature solution immersion growth of low-dimensional ZnO nanostructures on gold-seeded Si substrate has been demonstrated. pH environment of the precursor solution, Zn(NO3)2.6H2O (zinc nitrate hexahydrate) and C6H12N4 (HMTA) was found to have considerable effect to ZnO morphology and photoluminescence. Structural, morphological and photoluminescence (PL) properties of the samples were obtained from XRD, SEM and PL-Raman characterisation. A near neutral (pH = 6.8) and acidic (pH = 5) precursor solution aided a dense near-aligned ZnO nanorods growth with smallest rods diameter of 30 and 20 nm respectively. Whereas alkaline precursor solution (pH = 9) gave rise to flower-like structures of ZnO. Chemical equations for the reactions and the role of H+ and OH- ions role in affecting the XRD diffraction peaks and morphology, are suggested. Room temperature PL emission spectra of ZnO were collected after excitation at 325 nm. UV and visible emission distinctive of ZnO were formed and the rationale for significant shifts of the visible emission was also discussed.

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Periodical:

Advanced Materials Research (Volume 667)

Pages:

86-92

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.667.86

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Online since:

March 2013

Authors:

Zuraida Khusaimi, Mohamad Hafiz Mamat, Norbani Abdullah, Mohamad Rusop

Keywords:

pH, Solution-Immersion Method, ZnO Flower-Like Structure, ZnO Nanorod

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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