Se prepararon películas delgadas de SiO2 en relación molar TEOS:H2O:EtOH 1:18:1.8 y CuCoMn en relación molar Cu:Co:Mn 1:3:3 por el método de recubrimiento por inmersión (Sol-gel), bajo condiciones fijas de velocidad de depósito y número de capas. Inicialmente se usaron sustratos de vidrios con el fin de analizar el comportamiento óptico de los recubrimientos utilizando espectroscopía UV-Vis y FTIR. Una vez depositados los recubrimientos de SiO2 se sometieron a secado a temperatura ambiente y dentro de un horno tubular a 70 °C. Por otro lado, las muestras de CuCoMn se trataron térmicamente a diferentes temperaturas de recocido (550 °C, 600 °C y 650 °C) durante 12 horas a una rampa de 1 °C/min. Los resultados parciales obtenidos muestran que las películas exhiben una absortancia entre 75% - 95 %, lo cual está acorde con lo reportado en la literatura para este material. Sin embargo, para aumentar este valor es necesario ampliar el estudio del material, con el fin de definir su estructura, composición y morfología. El objetivo es obtener recubrimientos con las propiedades ópticas y estructurales adecuadas con el fin de ser usados en la fabricación de la superficie absorbedora de calentadores de agua e instalaciones de energía solar.
We present the design, construction, and implementation of thin film deposition equipment based on the Sol/Gel dip-coating technique for the fabrication of coatings under controlled deposition conditions and working environment at ambient temperature and pressure. The deposition system includes a 304 stainless steel structure and a moving platform that holds the substrate and is transported along vertical axes at a deposition distance of up to 30 cm in height. The mechanical and electronic design was considered, using computer-aided development and dimensional validation (for the structure and the motion transmission system) and the programming of the system using the Arduino platform. The design focused on the deposition speed control for the functional equipment operations, whose operating principle is based on a PWM scheme, achieving an immersion/extraction speed parameter in ranges between 1.5 cm/s and 3.5 cm/s (with a resolution of ± 0.2 cm/s). The operation of the equipment and the reproducibility of the deposits were tested by studying the optical properties of CuCoMn coatings on glass. A substrate immersion/extraction speed of 1.5 cm/s and precursor agitation time (0.83 h - 0.98 h) were used, obtaining absorbances higher than 90%. In conclusion, the implemented prototype will allow the research group to produce reproducible thin films of better quality than those made manually, which can be produced at a low cost and offer the possibility of sustainable maintenance of the equipment.
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