Obtención de nano-estructuras bi-dimensionales de SnO 2 utilizando el método pechini: estudio de la conformación de la resina

Abstract

Pechini method has been widely used in the synthesis of oxides, but the physicochemical process that happens during this one have not been discussed in detail, for example the resin conformation that is obtained in one of the stages of the process. Knowing the resin evolution and since the most important parameter of this one are modified, it could determinate the most appropriate conditions to conform thin films though the Pechini method. In this work the resin evolution of the tin system considering parameters like pH, viscosity, time and temperature of heating were studied. Infrared spectroscopy (FTIR) and viscosity measures in differents steps of the process were used. The IR spectroscopy results shows that as it advances the aging time of the resin, to a temperature between 80 and 100°C and a pH of 6,5, Sn-O bonds are strengthen. Films were conformed with the resin obtained during the pechini process, it being defined a value of 110cP as the most appropriate to favor the homogeneity and adherence of this ones. The grain size film was of ∼110nm what indicates that the realized process allows to obtain bidimensional nano-structures.