Influence of Ammonia Solution on Zinc Oxide Nanostructures by Hydrothermal Growth

Abstract

In previous work, ZnO nanorods and nanoflowers were synthesized on indium-tin-oxide (ITO) substrates by hydrothermal growth at low temperature ,using the different concentrations of equimolar (1:1) zinc nitrate Zn (NO3)26H2O and methenamine (C6H12N4) mixed as precursors solution, and adding ammonia solution to control the pH levels. In this paper, for comparison, the same experiment without ammonia solution was also discussed. SEM, XRD were utilized to characterize morphologies and crystal structures of ZnO. It was indicated that the pH of precursor solution leads to the significantly changes in the nanostructured ZnO. Besides, a hierarchical structure of some of the micro/nanotubes was obtained .The possible growth mechanism is discussed in this work.

The effect of Cu doping on the mechanical and optical properties of zinc oxide nanowires synthesized by hydrothermal route

“…The PEI content was fixed to be 0.37 g on 100 ml of the growth solution. The results, presented in figure 2, confirmed that increasing pH of the growth solution causes nanowires to be smaller in diameter which corresponds to the results reported before [2,24,31]. However obtained nanostructures grew in different pH and temperature ranges than reported previously in literature [24,25].…”

“…In the end a new and stable protocol of synthesis of ZnO nanostructures has been established. Those results contrast and expand upon other works [24,25]. Furthermore, ZnO NWs were doped with copper [15,26,27] and its effect on the functional properties of ZnO NWs have been discussed.…”

“…While the concentration of zinc nitrate hexahydrate and HMTA remained constant in all experiments, different content of polyethyleneimine (PEI, Sigma-Aldrich, branched, average M w ∼800 g mol −1 ) and ammonium solution (NH 3 , POCH, 25%) were added to the growth solution to investigate their impact on the morphology of ZnO nanostructures. It is important to remark that by controlling the precursors concentration, as well as the temperature of the reaction, one can obtain ZnO nanostructures with different morphologies [2,24,31].…”

Efficient photocatalytic degradation of dyes using photo-deposited Ag nanoparticles on ZnO structures: simple morphological control of ZnO

“…ZnO (egg noodle and 2D plate-like) structures were obtained by sodium citrate and urea. [22][23][24] NaOH is the most popular base since NaOH is easily ionized to Na + and OH À in an aqueous solution and increases the solubility of Zn(OH) 2 related to the formation [Zn(OH 4 )] 2À complex leading to a high yield of ZnO product. 21,25 Aer all, dening the correlation between the morphology and photocatalytic behavior of catalysts remains a challenge.…”