BECAS
PERALTA Carlos Adolfo
congresos y reuniones científicas
Título:
Titanium dioxide films deposited by cathodic arc for water treatment and microelectronics
Autor/es:
ADRIANA MÁRQUEZ; ARIEL KLEIMAN; STEPHAN MÄNDL; DARINA MANOVA; MARTA LITTER; MARTÍN MEICHTRY; DANIEL VEGA; IGNACIO ABINZANO; CARLOS PERALTA; CARLOS ACHA
Lugar:
Shangái
Reunión:
Conferencia; 14th International Conference on Plasma Based Ion Implantation & Deposition; 2017
Institución organizadora:
Chinese Academy of Sciences (SIC CAS)
Resumen:
Titanium dioxide is a material known to be non-toxic and to have excellent chemical and physical properties which make it very attractive for a wide variety of applications. One of the most active researches on titania film sis linked to its highhydropilicity and excellent photocatalytic activity under UV irradiation, with applications that include purification of wastewaters, disinfection based on the bactericidal properties, and its use as self-cleaning coating. Among the different TiO2 structures, anatase is considered the most photoactive phase. Recently, the use of titania films in a metal-insulator-metal device configuration has been evaluated as an alternative for the development of resistive non-volatile memories(Re-RAM) based on the resistive switching of the insulator placed in between two-terminal electrodes.Low and high resistive states can be programmed by application of voltage pulses to the metal electrodes. Stoichiometry and crystallinity of the TiO2 films influence on the switching behavior.Cathodic arc deposition (CAD) has demonstrated to be an efficient method for the deposition of TiO2films with good adhesion to the substrate. The structure of the films can be controlled through different deposition conditions, among them the substrate bias and temperature employed during the process. In this work, TiO2 films deposited by CAD were studied toward their use as photocatalyst in water decontamination treatments and as oxide layer in Re-RAM devices. The photocatalytic activity of anatase films grown on glass substrate was evaluated through their efficiency in Cr(VI) reduction in an aqueous solution under UV irradiation. The activity and the kinetic behavior were systematically studied as a function of the film thickness.The reaction efficiency increased as the thickness increased,achieving better performance than TiO2 P25 films synthesized by dip-coating. TiO2 films with a Ti interlayer deposited by CAD on glass substrates combined with a sputtered top platinum layer were tested asresistive memories of capacitive type. The resistive switching was studied by applying current?voltage cycles. The devices exhibited a bipolar resistive switching without the need for an electroforming step.