Photocatalytic TiO2 Nanorod Spheres and Arrays Compatible with Flexible ApplicationsReport as inadecuate


Photocatalytic TiO2 Nanorod Spheres and Arrays Compatible with Flexible Applications


Photocatalytic TiO2 Nanorod Spheres and Arrays Compatible with Flexible Applications - Download this document for free, or read online. Document in PDF available to download.

i3N-CENIMAT, Department of Materials Science, Faculty of Sciences and Technology, Universidade NOVA de Lisboa and CEMOP-UNINOVA, 2829-516 Campus de Caparica, Caparica, Portugal





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Academic Editors: Vladimiro Dal Santo and Alberto Naldoni

Abstract In the present study, titanium dioxide nanostructures were synthesized through microwave irradiation. In a typical microwave synthesis, nanorod spheres in the powder form were simultaneously produced with nanorod arrays grown on polyethylene terephthalate PET substrates. The syntheses were performed in water or ethanol with limited temperature at 80 °C and 200 °C. A simple and low-cost approach was used for the arrays growth, which involved a PET substrate with a zinc oxide seed layer deposited by spin-coating. X-ray diffraction XRD and Raman spectroscopy revealed that synthesis in water result in a mixture of brookite and rutile phases, while using ethanol as solvent it was only observed the rutile phase. Scanning electron microscopy SEM showed that the synthesized spheres were in the micrometer range appearing as aggregates of fine nanorods. The arrays maintained the sphere nanorod aggregate structures and the synthesis totally covered the flexible substrates. Transmission electron microscopy TEM was used to identify the brookite structure. The optical band gaps of all materials have been determined from diffuse reflectance spectroscopy. Photocatalytic activity was assessed from rhodamine B degradation with remarkable degradability performance under ultraviolet UV radiation. Reusability experiments were carried out for the best photocatalyst, which also revealed notable photocatalytic activity under solar radiation. The present study is an interesting and competitive alternative for the photocatalysts existing nowadays, as it simultaneously results in highly photoactive powders and flexible materials produced with low-cost synthesis routes such as microwave irradiation. View Full-Text

Keywords: TiO2; nanorod spheres; nanorod arrays; flexible substrates; microwave irradiation; photocatalysis TiO2; nanorod spheres; nanorod arrays; flexible substrates; microwave irradiation; photocatalysis





Author: Daniela Nunes * , Ana Pimentel, Lidia Santos, Pedro Barquinha, Elvira Fortunato * and Rodrigo Martins *

Source: http://mdpi.com/



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