Universiti Teknologi Malaysia Institutional Repository

Sol-gel based optically active phenolphthalein encapsulated nanomatrices for sensing application

Islam, S. and Bidin, N. and Riaz, S. and Krishnan, G. and Daud, S. and Naseem, S. and Marsin, F. M. (2016) Sol-gel based optically active phenolphthalein encapsulated nanomatrices for sensing application. Journal of Sol-Gel Science and Technology, 79 (3). pp. 616-627. ISSN 0928-0707

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In this work, synthesis and characterization of phenolphthalein-immobilized titania (T-phph) and silica–titania (ST-phph) nanomatrix is reported. The thin films are deposited by sol–gel method at low temperature. The effect of host–guest chemistry in matrices, on the surface structures, optical and sensing activity of the resultant thin films is studied. The phenolphthalein-immobilized fabricated nanoparticles/nanomatrices are analyzed by field emission scanning electron microscope, energy-dispersive X-ray spectroscopy, atomic-force microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, surface analysis, thermogravimetric analysis, and UV–Vis spectroscopy. Thermally stable and high surface area homogeneous nanoparticles, containing nanocrystalline anatase phase with low refractive index (1.58), low roughness (5.5 nm), and high transparency (95 %) are obtained for phenolphthalein-immobilized ST-phph nanomatrix. Moreover, smaller nanoparticles (56–121 nm) with good incorporation of dye and good response of sensing are obtained. The sensor response is optimized at pH 12 with 10.1 pKa value at 555 nm. Graphical Abstract: [Figure not available: see fulltext.

Item Type:Article
Uncontrolled Keywords:Atomic force microscopy, Energy dispersive spectroscopy, Fourier transform infrared spectroscopy, Nanocrystals, Nanoparticles, pH sensors, Refractive index, Scanning electron microscopy, Silica, Sols, Spectrum analysis, Surface analysis, Temperature, Thin films, Titanium dioxide, X ray diffraction, X ray spectroscopy, Energy dispersive X ray spectroscopy, Field emission scanning electron microscopes, Homogeneous nanoparticles, Low refractive index, Nanocrystalline anatase, Sensing applications, Synthesis and characterizations, Titania, Thermogravimetric analysis
Subjects:Q Science > QC Physics
ID Code:72153
Deposited By: Fazli Masari
Deposited On:23 Nov 2017 01:37
Last Modified:23 Nov 2017 01:37

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