El Instituto Politécnico Nacional
Contribuye al desarrollo económico y social de la nación, a través de la formación integral de personas competentes; de la investigación, el desarrollo tecnológico y la innovación. Además tiene reconocimiento internacional por su calidad e impacto social.
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http://repositoriodigital.ipn.mx/handle/123456789/11590| Título : | Shifting to the red the absorption edge in TiO2 films: a photoacoustic study |
| Palabras clave : | TITANIUM DIOXIDE PHOTOACOUSTIC |
| Fecha de publicación : | 16-ene-2013 |
| Editorial : | SUPERFICIES Y VACIO |
| Descripción : | When Titanium dioxide in contact with a polluted water sample is irradiated with ultraviolet light, electronhole
pairs can be generated, which can react with oxygen and water producing free radicals that can degrade
the pollutants, changing them into harmless compounds for the environment. The ultraviolet component of the
solar radiation is around 7%. Therefore, it is convenient to modify the TiO2 films crystalline structure for
obtaining photocatalytical processes with visible light. In this work we report on the growth of TiO2 thin films
by the Sol-gel technique considering the incorporation of AgNO3 in the initial solution containing the
precursor. The concentration of the AgNO3 saline solution was changed between 5 and 30% to control the grain
size of the grown TiO2 nanocrystals, impregnating 6 layers over glass slide substrates and using a sintering
temperature of 600 °C. The obtained films were characterized structurally by means of X-ray diffraction. The
shift in the forbidden energy bandwidth value to the red part of the optical absorption spectrum was evidenced
by Photoacoustic Spectroscopy. The photocatalytic activity was tested on a solution of methylene blue using
also the Photoacoustic technique. INSTITUTO POLITECNICO NACIONAL, CONACYT |
| URI : | http://www.repositoriodigital.ipn.mx/handle/123456789/11590 |
| Otros identificadores : | http://hdl.handle.net/123456789/1127 |
| Aparece en las colecciones: | Doctorado |
Ficheros en este ítem:
| Fichero | Descripción | Tamaño | Formato | |
|---|---|---|---|---|
| SyV-Marin_2011.pdf | 72.93 kB | Adobe PDF | Visualizar/Abrir |
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