Chemiresistors Based on SnO2, TiO2 and SnO2/TiO2 Films for Possible Sensing of Na+ and Ca2+ ions

• Main Authors: Hurboda, Denniell Ann, Macaraig, Lea, Limpoco, Ted, Enriquez, Erwin
• Format: text
• Published: Archīum Ateneo 2019
• Subjects: SnO2; TiO2 and composite SnO2/TiO2 chemiresistors; solution-processed; sol-gel; ion sensing; Chemistry
• Online Access: https://archium.ateneo.edu/chemistry-faculty-pubs/156; https://ieeexplore.ieee.org/document/8906507/
• Institution: Ateneo De Manila University

Semiconductor metal oxide films have been used in sensing-based applications, and they are typically prepared by vacuum deposition techniques. In this study, we used solution-processed semiconductor metal oxides to investigate their sensitivity for cations in aqueous solution. Specifically, solution-processed tin(IV) oxide (SnO 2 ), titanium dioxide (TiO 2 ) and a composite of SnO 2 /TiO 2 were deposited on fluorine-doped tin oxide (FTO) glass and these were tested for their chemiresistive properties when exposed to cationic species in solution. Techniques such as grazing incidence X-ray diffraction (GIXRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and the surface profiler were utilized to characterize the metal oxide films.