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      Dielectric relaxation studies in activated carbon doped Titanium Dioxide at high temperatures Translated title: Estudios de relajación dieléctrica a altas temperaturas en dióxido de titanio modificado con carbón activado

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          Abstract

          Abstract Titanium Dioxide (TiO2) has been an object of different investigations in the recent years, principally to its applications in solar cells due to its interesting optic, electric and magnetic properties. In this work is presented the dielectric response study of activated carbon doped TiO2 in pressed pills in different Molar relations. The electric behavior of the composites is obtained by bringing the samples to a Nitrogen and Helium atmosphere and studying with complex impedance spectroscopy, in the 50Hz to 5 MHz frequency interval and from room temperature to 723 K. The experimental results showed that the Nitrogen atmosphere leads to an anionic doping, in which an nitrogen anion (A) gets into the TiO2 lattice, replacing an oxygen and forming TiO2-x Ax.

          Translated abstract

          Resumen El óxido de titanio (TiO2) ha sido objeto de diferentes investigaciones en los últimos años, debido a su aplicabilidad en celdas solares, por sus interesantes propiedades ópticas, eléctricas y magnéticas. En este trabajo se presenta el estudio de la respuesta dieléctrica de pastillas prensadas de TiO2 mezclado con carbón activado para diferentes fracciones molares. El comportamiento eléctrico de los compósitos es analizado cuando las muestras se someten en atmósfera de nitrógeno y de helio y se estudia mediante espectroscopia de impedancia compleja, en el intervalo de frecuencias de 50Hz a 5 MHz y desde temperatura ambiente hasta 723 K. Por los resultados del comportamiento dieléctrico de las muestras, se evidencia que una atmósfera de nitrógeno produce un dopaje aniónico, donde un anión (A) del nitrógeno entra en la red del TiO2 en substitución de un oxígeno y forma el TiO2-x Ax.

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          Most cited references14

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          Non-symmetrical dielectric relaxation behaviour arising from a simple empirical decay function

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            Dielectric relaxation in solids

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              Vertically aligned single crystal TiO2 nanowire arrays grown directly on transparent conducting oxide coated glass: synthesis details and applications.

              Single-crystal one-dimensional (1D) semiconductor architectures are important in materials-based applications requiring a large surface area, morphological control, and superior charge transport. Titania has widespread utility in applications including photocatalysis, photochromism, photovoltaics, and gas sensors. While considerable efforts have focused on the preparation of 1D TiO2, no methods have been available to grow crystalline nanowire arrays directly onto transparent conducting oxide (TCO) substrates, greatly limiting the performance of TiO2 photoelectrochemical devices. Herein, we present a straightforward low temperature method to prepare single crystal rutile TiO2 nanowire arrays up to 5 microm long on TCO glass via a non-polar solvent/hydrophilic substrate interfacial reaction under mild hydrothermal conditions. The as-prepared densely packed nanowires grow vertically oriented from the TCO glass substrate along the (110) crystal plane with a preferred (001) orientation. In a dye sensitized solar cell, N719 dye, using TiO2 nanowire arrays 2-3 microm long we achieve an AM 1.5 photoconversion efficiency of 5.02%.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                inco
                Ingeniería y competitividad
                Ing. compet.
                Facultad de Ingeniería, Universidad del Valle (Cali, Valle del Cauca, Colombia )
                0123-3033
                June 2017
                : 19
                : 1
                : 101-108
                Affiliations
                [1] Armenia Quindío orgnameUniversidad del Quindío orgdiv1Facultad de Ciencias Básicas y Tecnologías orgdiv2Programa de Física Colombia kacastanedamuqvirtual.edu.co, pcuellarbuqvirtual.edu.co, jhcastillo@ 123456uniquindio.edu.co
                Article
                S0123-30332017000100101
                70f7ebf0-5667-4e8e-a59e-28f462e8d9d7

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 25 November 2015
                : 19 February 2016
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 14, Pages: 8
                Product

                SciELO Colombia


                TiO2,Dielectric relaxation,solar cells,photocatalysis,Celdas solares,relajación dieléctrica,fotocatálisis

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