Effect of pH on the morphology and optical properties of modified ZnO particles by SDS via a precipitation method

ZnO particles were synthesized directly from an aqueous solution of zinc acetate dihydrate in the presence of sodium dodecyl sulfate (SDS) and sodium hydroxide at 70 °C. The morphological changes were investigated in the range of pH 8–12. The hexagonal prism-like shape was formed at pH 8 and 10 by i...

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Bibliographic Details
Published in:Powder technology 2010-11, Vol.203 (2), p.243-247
Main Authors: Samaele, N., Amornpitoksuk, P., Suwanboon, S.
Format: Article
Language:English
Subjects:
Aqueous solutions
Morphology
Optical properties
Powder technology
Precipitation
Sodium
Sodium dodecyl sulfate
Sodium hydroxide
Zinc oxide
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Summary:ZnO particles were synthesized directly from an aqueous solution of zinc acetate dihydrate in the presence of sodium dodecyl sulfate (SDS) and sodium hydroxide at 70 °C. The morphological changes were investigated in the range of pH 8–12. The hexagonal prism-like shape was formed at pH 8 and 10 by inhibition of growth along the c direction whereas the small rod-like shape was observed at pH 12. The estimated band gap and the room temperature photoluminescence intensity in a visible region are dependent upon the geometrical shape and size of the ZnO particles. The hexagonal prism-like shape is observed at pH = 8 and 10 on the other hand the small rod structure is found at pH = 12. The changing of morphology can be explained by interaction between SDS and growth unit. The stabilized Zn(OH) 2 by SDS molecules probably inhibits the ZnO formation which can be confirmed by the FT-IR results. This evidence fulfills with the reason why the rate of ZnO formation is too slow at low pH. [Display omitted]
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2010.05.014