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

Gina Prado-Prone; Guadalupe Valverde-Aguilar; Jorge García-Macedo; P. Vergara-Aragón

doi:10.1117/12.929116

15 October 2012 Photoconductivity and stabilization of dopamine embedded in sol-gel TiO₂matrix

Gina Prado-Prone, Guadalupe Valverde-Aguilar, Jorge García-Macedo, P. Vergara-Aragón

Proceedings Volume 8456, Nanophotonic Materials IX; 84560D (2012) https://doi.org/10.1117/12.929116
Event: SPIE NanoScience + Engineering, 2012, San Diego, California, United States

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.

Citation Download Citation

Gina Prado-Prone, Guadalupe Valverde-Aguilar, Jorge García-Macedo, and P. Vergara-Aragón "Photoconductivity and stabilization of dopamine embedded in sol-gel TiO₂matrix", Proc. SPIE 8456, Nanophotonic Materials IX, 84560D (15 October 2012); https://doi.org/10.1117/12.929116

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available