Mesoporous SiO2–TiO2 nanocomposite for pH sensing

Islam, Shumaila; Bidin, Noriah; Riaz, Saira; Rahman, Rosly Abdul; Naseem, Shahzad; Marsin, Faridah Mohd

doi:10.1016/j.snb.2015.06.095

Cited by 29 publications

(16 citation statements)

References 36 publications

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“…Pt was introduced by impregnation followed by either reduction in H 2 at 400 o C or calcination at 300 o C. TEM, XRD and Raman spectroscopic measurements proved that TiO 2 existed in the form of aggregates of polycrystalline anatase with primary particle size of [15][16][17][18][19][20] nm in each of the samples. Photocatalytic hydrogen production was influenced by the combined effect of many parameters.…”

Section: Introductionmentioning

confidence: 99%

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PtOx-SnOx-TiO2 catalyst system for methanol photocatalytic reforming: Influence of cocatalysts on the hydrogen production

et al. 2018

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Abstract:Effects of modification of PtO x -TiO 2 photocatalysts by tin were elucidated by exploring relationships between the structural properties of variously prepared tin-loaded catalysts and their catalytic activity in methanol photocatalytic reforming. Tin free and amorphous tinoxide decorated TiO 2 samples were prepared by sol-gel method from titanium-isopropoxide.In other approach, Sn was loaded onto the sol-gel prepared TiO 2 by impregnation followed by calcination. Pt was introduced by impregnation followed by either reduction in H 2 at 400 o C or calcination at 300 o C. TEM, XRD and Raman spectroscopic measurements proved that TiO 2 existed in the form of aggregates of polycrystalline anatase with primary particle size of 15-20 nm in each of the samples. Photocatalytic hydrogen production was influenced by the combined effect of many parameters. Both the presence of Sn and the way of Pt co-catalyst formation played important role in the activity of these photocatalysts. The Sn introduction by both sol-gel method and impregnation clearly enhanced the photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

“…Sol-gel methods gives possibility to introduce doping elements [11][12][13][14] or their combination simultaneously [15], to prepare composite type TiO 2 -based materials [16,17]. Sol-gel method is a possible way to obtain coatings or nanocoatings [18], porous films [19] or ordered mesoporous structures [20,21].…”

Section: Introductionmentioning

confidence: 99%

PtOx-SnOx-TiO2 catalyst system for methanol photocatalytic reforming: Influence of cocatalysts on the hydrogen production

et al. 2018

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“…5IIa, b. In accordance with International Union of Pure and Applied Chemistry (IUPAC) classification, both T-phph and STphph samples possess a stepwise adsorption and desorption type IV hysteresis H 2 . Hysteresis H 2 type associated with ink-bottle pores is due to capillary condensation in the pores of the matrix [7,27]. These hysteresis loops were observed in the relative pressure P/Po range of 0-1.0, which implies the presence of mesopores with a well-defined pore structure.…”

Section: Resultsmentioning

confidence: 99%

“…Even though significant advances in technologies based on sol-gel thin film processing have been reported [1][2][3][4][5][6][7], still relatively little efforts are directed toward understanding the different pH-sensing dyes' immobilization behavior into sol-gelbased silica matrices without leaching problem [8][9][10]. These can be used for designing photocatalysts, for water detection, and also for developing the novel chemical sensor materials [11].…”

Section: Introductionmentioning

confidence: 99%

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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“…In the last decades, TiO 2 has become more relevant for the industry due to its wide range of applications in self‐cleaning surfaces, antibacterial coatings, optical filters, electrodes in solar cells, sensors, among others . Nowadays, TiO 2 films are being replaced by SiO 2 –TiO 2 mixed compositions in order to improve its performance for the applications previously mentioned …”

Section: Introductionmentioning

confidence: 99%

Engineered TiO₂ and SiO₂‐TiO₂ films on silica‐coated glass for increased thin film durability under abrasive conditions

Ramírez-García¹,

González-Rodríguez²,

Arroyo-Ortega³

et al. 2016

Int J Applied Ceramic Tech

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Thin films durability is critical to retain its performance in real life applications. For automotive glass, further factors such as haze appearance developed under abrasive conditions become relevant to ensure the driver's visibility. Macroscopic abrasion resistance tests of TiO2/SiO2 and SiO2–TiO2/SiO2 thin films on soda‐lime silica (SLS) glass were performed according to an American standard for safety grazing. The purpose of this, was to increase the top active film durability in a bilayer system by understanding how film thickness and top film composition influence abrasion performance. In order to achieve this understanding, three approaches were considered: (a) determination of the influence of TiO2 top film thickness, (b) replacement of the TiO2 top film by SiO2–TiO2 films, and (c) determination of the influence of SiO2–TiO2 film thickness. Results showed that thinner top TiO2 film thickness leads to SiO2/TiO2 bilayers with lower haze value and improved abrasion resistance. It was also found that SiO2 addition to TiO2 top film composition promotes the thin film adhesion and sample durability against abrasive wear. Friction coefficient and micro‐hardness measurements support the abrasion results. Factors contributing to the improvement of the lifetime performance of TiO2 and SiO2–TiO2 thin films were identified.

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Mesoporous SiO2–TiO2 nanocomposite for pH sensing

Cited by 29 publications

References 36 publications

PtOx-SnOx-TiO2 catalyst system for methanol photocatalytic reforming: Influence of cocatalysts on the hydrogen production

PtOx-SnOx-TiO2 catalyst system for methanol photocatalytic reforming: Influence of cocatalysts on the hydrogen production

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

Engineered TiO₂ and SiO₂‐TiO₂ films on silica‐coated glass for increased thin film durability under abrasive conditions

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Mesoporous SiO2–TiO2 nanocomposite for pH sensing

Cited by 29 publications

References 36 publications

PtOx-SnOx-TiO2 catalyst system for methanol photocatalytic reforming: Influence of cocatalysts on the hydrogen production

PtOx-SnOx-TiO2 catalyst system for methanol photocatalytic reforming: Influence of cocatalysts on the hydrogen production

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

Engineered TiO2 and SiO2‐TiO2 films on silica‐coated glass for increased thin film durability under abrasive conditions

Contact Info

Product

Resources

About

Engineered TiO₂ and SiO₂‐TiO₂ films on silica‐coated glass for increased thin film durability under abrasive conditions