Abstracts Book - IMRC 2018

• SC4-P111
THEORETICAL-EXPERIMENTAL ANALYSIS OF THE INFLUENCE OF
FUNCTIONAL ORGANIC GROUPS PRESENT IN DYE OF THE FRUIT
OF GARAMBULLO ON THIN FILMS OF TITANIUM DIOXIDE (TIO2)
Porfirio Esa㺠Martínez Muñoz 1 , Minerva Robles Agudo 2 , Patricia Durán Arenas 1 , Ruben
Velazquez Hernandez 1 , Ivo Neftali Ayala Garcia 3 , Ignacio Rojas Rodriguez 1
1
Universidad Tecnológica de Querétaro, Industrial-Nanotecnología, Mexico. 2 Cátedra
CONACYT-Universidad Tecnológica de Querétaro, Industrial-Nanotecnología, Mexico.
3 Universidad Tecnológica de Querétaro, Mecatrónica, Mexico.
Among the third generation solar cells, one of the most promising alternatives
is to use Dye Sensitized Solar Cells (DSSC), where an organic or inorganic dye, is
adsorbed by a semiconductor that acts as a collector of solar energy. The
excitation induced by the photon takes place in the dye that transfers an
electron to the semiconductor initiating the current cycle. Therefore the dye
extends the absorption range of the semiconductor to a wider range of
wavelength. According to the above, our interest arises in analyzing the
molecular interaction between organic dyes and TiO2 semiconductor. In this
work we report a theoretical-experimental analysis of the influence of the
functional groups present in the dye the fruit of garambullo (Myrtillocactus
geometrizans), typical in Mexico, on TiO2 thin films. We describe the
methodology carried out for the extraction and characterization of the dye using
the Soxhlet extraction method with ethanol (100%) and the sonication extraction
method with water (100%) and water-ethanol (50% -50%), using citric acid 1% as
stabilizer. Characterization of the dye and TiO2 thin films was carried out using
the techniques of thin layer chromatography, DRX, TEM, Raman and IR
microscopy. According to the results obtained, the presence of betalains was
detected, specifically betacyanins and betaxanthines, which are stable at low
temperatures and acid medium. The results obtained in the theoreticalexperimental
analysis describe the different molecular bonds present between
the two compounds that originate the displacement of the final absorption peak
obtained.
Acknowledgment: This work has been financed by CONACYT through the
project 256923
Keywords: GARAMBULLO, TITANIUM DIOXIDE, ABSORPTION
Presenting authors email: porfiriomartinezm2@gmail.com