Synthesis and characterization of hybrid matrix with encapsulated organic sensing dyes for pH sensing application

• Main Authors: Islam, Shumaila, Abdul Rahman, Rosly, Othaman, Zulkafli, Riaz, Saira, Naseem, Shahzad
• Format: Article
• Published: Elsevier 2014
• Subjects: Q Science
• Online Access: http://eprints.utm.my/id/eprint/62771/; https://doi.org/10.1016/j.jiec.2014.02.008
• Institution: Universiti Teknologi Malaysia

Films of multi-organic indicators, encapsulated in silica-titania hybrid matrix with CTAB, have been synthesized using sol-gel dip coating method. Two types of stable,dense and uniform matrices were annealed at a 150 degrees C within two time intervals 1 h and 2 h by using 0.1 M and 0.5 M indicator concentrations. Nanoparticles are uniformly distributed with size in the range from 15-28 nm. Matrices have high surface area (418.18-441.30 m(2)/g), which has more capability to sense the broader pH range. Spectroscopic studies showed the establishment of heterogeneous chemical bonding which indicative of stability of matrices with 69% porosity. The response of the sensor is optimum at pH 9. (C) 2014 The Korean Society of Industrial and Engineering Chemistry.