INTECINCONICETUBAFacultad de Ingenieria

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Materials Engineering | Solid Amorphous

Chalcogenide Glasses

Faculty of Engineering. Department of Physics. UBA
Paseo Colón 850. Ciudad Autónoma de Buenos Aires.C1063ACV
Phone: + 54 11 4343 0092 Internal: 279 / 232 / 244

Research Field

Amorphous materials, micro and nanostructured materials.

RESEARCH:
Chalcogenide Glass:
- Studies of structure, stability, crystallization kinetics, transport properties, magnetic, optical and sensitivity to metals in solution.
- Application to devices: battery, memory, optical devices, sensors Heavy Metals.

Members

Direction:

Arcondo, Bibiana. PhD. Profesora Asociada.

barcondo@fi.uba.ar

__

Fontana, Marcelo. PhD. Investigador Independiente de CONICET. Profesor Asociado.

mfontan@fi.uba.ar

Ureña, María Andrea. PhD. Investigadora Adjunta de CONICET. Profesora Adjunta.

murena@fi.uba.ar

Conde Garrido, Juan Manuel. M.S. Jefe Trabajo Práctico. Becario CONICET.

jumacoga@yahoo.com.ar

Rocca, Javier A.

jrocca@fi.uba.ar

Work Description

This group is dedicated to the study of chalcogenide glasses pointing to some of its many current and potential applications.

Chalcogenide glasses (base Te, Se or S) are formed very easily in volume (by air or warm water) and through various thin film deposition techniques (thermal evaporation, sputtering, laser ablation, ..).
Among its more interesting features include its unique optical properties (transparency in the infrared, photosensitivity ...) making them potential candidates for the development of compounds that work in optical telecommunication window (1.55 microns) even in the infrared up to 20 microns for Te-based glasses. It is also notable for its electrical behavior. In general are semiconductors, but with Ag or alkali metals in solution can behave as fast ion conductors, making them suitable as solid electrolytes.
Their properties, both optical and electrical are strongly dependent on the composition and structure, which may present abrupt changes particularly to a phase change. In this case could be used in the construction of phase-change memories.

The chalcogenide glasses with metals in its composition (including Ag and Sb) are among the materials most promising for use as sensitive membranes in the development of chemical sensors selective metal ions (Cu2 +, Pb2 +, Cd2 +, Hg2 +, etc.) in aqueous media.

We are currently engaged in the study of two important materials for technological applications: data storage devices and chemical sensors.

- Design and production of chalcogenide glasses in bulk or as films (PLD).
- Characterization of their morphology, structure, crystallization kinetics and products.
- Determination of electrical conductivity as a function of T, the composition and structure.
- Exploration of switching effects in the conductivity during a phase change induced by different agents, including fotodisolución.
- Testing by potentiometric measurements of electrochemical sensors in volume and in film. Analysis of their selectivity, sensitivity and stability. Taking measurements in solutions containing interfering ions and selectivity analysis of the sensors.
- Optical characterization of films targeting its potential applications in optical memories and sensors optoquímicos.