Bibliographic Details
| Title: |
Composito nanocristalino novedoso de CuO-TiO2: inyección de electrones del CuO al TiO2 iluminando con luz visible sin voltaje de polarización. |
| Authors: |
Vigil, E.1,2, Ayllón, J.A.3, Sánchez, S.2,4, Azúa, L.1,2 |
| Source: |
Revista Cubana de Física. 2009, Vol. 26 Issue 2A, p165-168. 4p. 2 Graphs. |
| Subjects: |
OPTICAL properties of nanocrystals, PHOTOCATALYSIS, PHOTOVOLTAIC cells, OPTICAL polarization, STEREOCHEMISTRY |
| Abstract (English): |
Films of CuO-TiO2 composite were prepared at room temperature on conducting glass substrates using a novel photodeposition technique followed by temperature annealing in order to completely oxidize all copper species. Films were deposited exploiting TiO2 photocatalytic properties. Near UV radiation passed through the substrate in contact with an aqueous TiO2 suspension containing copper(II) nitrate and ethanol in solution. Structures formed by the conducting glass (ITO), the CuO-TiO2 composite, a hole conducting polymer and a silver contact were assembled. Illuminating this structure, without a bias voltage, a short-circuit photocurrent is produced. Its direction indicates that electrons are injected from the copper oxide to the TiO2. This photocurrent dependence with time is analyzed after light is shut off. [ABSTRACT FROM AUTHOR] |
| Abstract (Spanish): |
Capas del composito CuO-TiO2 fueron preparadas a temperatura ambiente sobre substratos de vidrio conductor utilizando una novedosa técnica de fotodeposición seguida por un tratamiento térmico en aire para oxidar completamente todas las especies de cobre. Las capas fueron depositadas gracias a las propiedades fotocatalíticas del TiO2. Se irradió con UV cercano a través del vidrio conductor en contacto con una suspensión acuosa de TiO2. La misma contenía en solución nitrato de cobre (II) y etanol. Se fabricaron estructuras constituidas por un vidrio conductor (ITO), el composito CuO-TiO2, un polímero conductor de huecos y un contacto de Ag. Iluminando esta estructura, sin voltaje de polarización, se obtiene una corriente de cortocircuito cuyo sentido indica que se inyectan electrones del óxido de cobre al TiO2. Se analiza la dependencia en el tiempo de esta fotocorriente de corto circuito al interrumpir la iluminación. [ABSTRACT FROM AUTHOR] |
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| Database: |
MedicLatina |
