Zinc oxide nanorods for the solid phase microextraction of volatile aldehydes
Zinc oxide (ZnO)
nanoparticles have been successfully employed in different application fields
due to their inherent characteristics such as wide band-gap or thermal
stability. As with other nanomaterials, zinc oxide may exist in many structural
forms depending on the synthetic process. In this sense, ZnO nanorods can be
easily obtained in the laboratory by a hydrothermal treatment using zinc
nitrate and hexamethylenetetramine as precursors. The concentrations of the
precursors, as well as the temperature and incubation time, play a key role in
the final physical characteristics of the product as it is indicated in Figure
1. Figure 1A shows a scanning electron micrograph of the ZnO nanoparticles
before the hydrothermal reaction while Figures 1B-C illustrate the final
product using different starting equimolar concentrations of the precursors
(0.1 mM, 1mM and 10 mM, respectively). The average width and length of the
nanorods increase with the initial concentration of precursors. However, the total
effective surface area increases with the concentration from 0.1 to 1 mM,
decreasing for higher concentrations since the nanorods tend to stack up (1).
Figure 1. Effect of the precursors´concentration on the structure of the ZnO nanorods. For details, see text. This image is reproduced from reference 1. |
In the article, the
readers will find the synthetic procedure, the modification of the SPME manifold
to avoid the shaving of the coating as well as the characterization and
performance of the new coating.
References:
(1) Enhanced visible
light photocatalysis through fast crystallization of zinc oxide nanorods. Link to the article
(2) ZnO nanorod array
solid phase micro-extraction fiber coating: fabrication and extraction
capability. Link to the article
(3) ZnO nanorod coating
for solid phase microextraction and its applications for the analysis of
aldehydes in instant noodle samples. Link to the article
Special
acknowledgements to: Beilstein Journal of Nanotechnology. This open access
journal permits unrestricted use, distribution, and reproduction in any medium,
of its material. Figure 1 has been reproduced from one article which is also
referenced in this post (1).
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