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Your search keyword '"Filippin, A. Nicolas"' showing total 2 results
Start Over Author "Filippin, A. Nicolas" Publisher nature publishing group
2 results on '"Filippin, A. Nicolas"'

1. One-reactor plasma assisted fabrication of ZnO@TiO2 multishell nanotubes: assessing the impact of a full coverage on the photovoltaic performance

Author

Universidad de Sevilla. Departamento de Química Inorgánica, Filippin, A. Nicolas, Macías Montero, Manuel Jesús, Saghi, Zineb, Idígoras, Manuel Jesús, Sánchez Valencia, Juan Ramón, Barranco Quero, Ángel, Migdley, Paul.A, Anta Montalvo, Juan Antonio, Borrás Martos, Ana Isabel, Universidad de Sevilla. Departamento de Química Inorgánica, Filippin, A. Nicolas, Macías Montero, Manuel Jesús, Saghi, Zineb, Idígoras, Manuel Jesús, Sánchez Valencia, Juan Ramón, Barranco Quero, Ángel, Migdley, Paul.A, Anta Montalvo, Juan Antonio, and Borrás Martos, Ana Isabel

Abstract

This paper addresses the fabrication of vertically aligned ZnO@TiO2 multishell nanotubes by a combined full vacuum-plasma approach at mild temperatures. The growth is carried out within the premises of a one-reactor approach, i.e. minimizing the number of vacuum chambers and sample transferences. In this way, the interface between ZnO and TiO2 is fully preserved from humidity thus increasing ZnO durability and stability. These nanostructures are studied by scanning electron microscopy (SEM), scanning transmission electron microscopy (STEM) and energy dispersive X-ray spectroscopy in STEM (EDX-STEM). High density one-dimensional arrays of these nanotubes formed on FTO substrates are applied as photoanode in a dye-sensitized solar cell (DSC). The evolution of the dye adsorption capacity and solar cells parameters are explored as a function of the crystallinity and thickness of the TiO2 shell. The results show the critical effect of a full coverage by TiO2 of ZnO core to explain the mixed results found in the literature.

Published
2017

2. Vacuum template synthesis of multifunctional nanotubes with tailored nanostructured walls.

Author

Filippin AN, Macias-Montero M, Saghi Z, Idígoras J, Burdet P, Barranco A, Midgley P, Anta JA, and Borras A

Abstract

A three-step vacuum procedure for the fabrication of vertical TiO2 and ZnO nanotubes with three dimensional walls is presented. The method combines physical vapor deposition of small-molecules, plasma enhanced chemical vapor deposition of inorganic functional thin films and layers and a post-annealing process in vacuum in order to remove the organic template. As a result, an ample variety of inorganic nanotubes are made with tunable length, hole dimensions and shapes and tailored wall composition, microstructure, porosity and structure. The fabrication of multishell nanotubes combining different semiconducting oxides and metal nanoparticles is as well explored. This method provides a feasible and reproducible route for the fabrication of high density arrays of vertically alligned nanotubes on processable substrates. The emptying mechanism and microstructure of the nanotubes have been elucidated through SEM, STEM, HAADF-STEM tomography and energy dispersive X-ray spectroscopy. In this article, as a proof of concept, it is presented the straightforward integration of ZnO nanotubes as photoanode in a photovoltaic cell and as a photonic oxygen gas sensor.

Published
2016
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