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Falcão, A.N.; Sousa, J. Santos; Carrapico, M.; Margaça, F.M.A.; Carvalho, F. G.; Salvado, Isabel M. Miranda; Teixeira, J.

doi:10.1023/a:1020796409659

Cited by 11 publications

(2 citation statements)

References 3 publications

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“…2a, b shows that the dried films are porous, dense, and homogeneous nanoclusters. However, agglomeration of nanoparticles is observed in both samples probably due to the hydroxyl ions and adsorbed water molecules on the surface of the films as observed by other researchers [19]. In case of T-phph, the surface was less porous and nanoparticle size was found to be 79-118 nm.…”

Section: Resultssupporting

confidence: 59%

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

Islam

Bidin

Riaz

et al. 2016

J Sol-Gel Sci Technol

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In this work, synthesis and characterization of phenolphthalein-immobilized titania (T-phph) and silicatitania (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.

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Section: Resultssupporting

confidence: 59%

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

Islam

Bidin

Riaz

et al. 2016

J Sol-Gel Sci Technol

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show abstract

“…Hence, there is continuity in developing new pH detection techniques with modified materials. Furthermore, high surface area silica-titania hybrid matrix with unique properties obtained by the sol-gel synthesis assigned for various applications like microelectronics, optical coatings, optochemical sensors, host matrices for sensing analysts and environmental monitoring 2,3 . The sol-gel method possesses an advantage to synthesize the densified, homogeneous and porous material at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

STRUCTURAL AND OPTICAL PROPERTIES OF SURFACTANT ASSISTED SiO2-TiO2 HYBRID MATRIX FOR PH SENSING: SOL-GEL APPROACH

et al. 2016

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Structural and optical properties of surfactant-assisted SiO2-TiO2 hybrid matrix as a highly responsive optical sensing material by sol-gel method are investigated. Microscopic results indicate the uniform morphology with large pores without any cracks. Matrices have a high surface area (489–342 m2/g), which has more capability to sense the broader pH range. From UV–visible spectroscopy, it is found that after encapsulation, matrix has ~ 78 % optical transparency with low refractive index of 1.44 corresponding to thickness 138.7 nm. Sensing analysis revealed that the prepared coating has good sensitivity at pH 12 and fast response time. Low refractive index and highly porous matrix, combined for achieving a good responsive optical chemical sensors. This research also opens an aveanue for ths material to be considered as a functional coating.

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In Situ‐Generated Fillers: Bicontinuous Phase Nanocomposites

Mascia

2010

Functional Fillers for Plastics

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Untitled

Cited by 11 publications

References 3 publications

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

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

STRUCTURAL AND OPTICAL PROPERTIES OF SURFACTANT ASSISTED SiO2-TiO2 HYBRID MATRIX FOR PH SENSING: SOL-GEL APPROACH

In Situ‐Generated Fillers: Bicontinuous Phase Nanocomposites

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