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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
Published on: May 2, 2014
Ajuste de tamaño de nanoestructuras de óxido de zinc mediante nanopartículas de TiO 2 ultrapequeñas
Geovanne Lemos de Assis1, Artur Luis Hennemann1, Helton Pereira Nogueira1
1Laboratory of Supramolecular Chemistry and Nanotechnology, Department of Fundamental Chemistry, Institute of Chemistry, University of Sao Paulo. São Paulo, SP 05508-000, Brazil.
Abstract:
The interaction of positively charged ZnO nanorods (nr-ZnO) with negatively charged ultrasmall amorphous titanium dioxide (am-TiO2) nanoparticles (NPs) induced a decrease in the nr-ZnO particle size while forming nanostructured core@shell xZT materials (Zn/Ti molar ratios of 16, 8, 4, 2, and 1). Such an unexpected outcome was assigned to the high affinity and Zn-(II) ion adsorption capacity of am-TiO2 NP, as confirmed by the amount of Zn-(II) ion in equilibrium in solution with am-TiO2 determined by ICP-OES and the respective adsorption isotherm profile. The changes in size, morphology, and crystallinity compared to pure nr-ZnO were monitored by FTIR and UV-vis spectroscopy, dynamic light scattering (DLS), and X-ray diffractometry (XRD) and confirmed by transmission electron microscopy (TEM), suggesting a promising strategy to explore size-dependent nanoscale phenomena in ZnO-based nanomaterials.
