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Proceedings Paper

Photoconductivity and stabilization of dopamine embedded in sol-gel TiO2 matrix
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Paper Abstract

This work reports the synthesis of amorphous TiO2 matrix by sol-gel method at atmospheric conditions. DA was encapsulated in a TiO2 matrix to reduce its chemical instability. To TiO2/DA sample was added the 15C5 to diminish the oxidation process. The stabilization process was followed by absorption spectra, colour change and infrared spectroscopy. Oxidation processes of the DA were identified by the presence of DA-quinone and DA-chrome. The TiO2/DA complex retarded the oxidation process for 30 days, while the TiO2/DA/15C5 complex this period was extended for 47 days. Photoconductivity studies were performed on both kinds of samples to analyze their charge transports. The experimental data were fitted with straight lines at darkness and under illumination at 320 nm, 400 nm, and 515 nm. This indicates an ohmic behavior. Transport parameters were calculated. The conductive effect is stronger under darkness than under illumination at 320 nm because the oxidation process in the darkness is less intense than under illumination.

Paper Details

Date Published: 15 October 2012
PDF: 16 pages
Proc. SPIE 8456, Nanophotonic Materials IX, 84560D (15 October 2012); doi: 10.1117/12.929116
Show Author Affiliations
Gina Prado-Prone, Univ. Nacional Autónoma de México (Mexico)
Guadalupe Valverde-Aguilar, Instituto Politécnico Nacional (Mexico)
Jorge García-Macedo, Univ. Nacional Autónoma de México (Mexico)
P. Vergara-Aragón, Univ. Nacional Autónoma de México (Mexico)

Published in SPIE Proceedings Vol. 8456:
Nanophotonic Materials IX
Stefano Cabrini; Taleb Mokari, Editor(s)

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