Formation and evolution of TiO2 nanotubes in alkaline synthesis

Arruda, Larisa Baldo de; Santos, C.; Orlandi, Marcelo Ornaghi; Schreiner, W. H.; Lisboa‐Filho, Paulo Noronha

doi:10.1016/j.ceramint.2014.10.113

Cited by 64 publications

(36 citation statements)

References 25 publications

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“…It was identified that the diffraction peaks at 2θ = 25.24, 37.62, 48.22, and 54.72° are ascribed to the anatase phase; however, the 2θ = 30° highest peak belongs to the brookite phase or NaO3. Similar results were reported by Arruda et al [35]. The SEM images of the TiO2-NTs are presented in Figure 3.…”

Section: Resultssupporting

confidence: 89%

Magnetoelastic Humidity Sensors with TiO2 Nanotube Sensing Layers

Atalay

İzgi

Kolat

et al. 2020

Sensors

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In this study, TiO2 nanotubes (TiO2-NTs) are coated with a drop-casting method on Fe40Ni38Mo4B18 amorphous ferromagnetic ribbons and the humidity response of the prepared magnetoelastic sensors (MES) is investigated. The synthesis of TiO2-NTs is performed using a hydrothermal process. Sample characterization is carried out using X-ray diffraction and scanning electron microscopy. The results show that the sensors can measure moisture values in the range of 5% to 95% with very high precision and very low hysteresis. The humidity variation between 5% and 95% shows a change in the sensor resonance frequency of ~3180 Hz, which is a significant change compared to many magnetoelastic humidity sensors developed so far.

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Section: Resultssupporting

confidence: 89%

Magnetoelastic Humidity Sensors with TiO2 Nanotube Sensing Layers

Atalay

İzgi

Kolat

et al. 2020

Sensors

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“…Nowadays the hydrothermal synthesis of TiO 2 nanostructures is a well-established technique and typically yields a large amount of TiO 2 nanostructures from solution [16,17]. Most of the current researches focus on the alkali-hydrothermal approaches with high alkali concentration (8-12 M), which usually produces different morphology types of 1D TiO 2 nanostructures (nanotube, nanorod, nanowire, nanofiber or nanobelt) [18,19]. Although the properties and applications of TiO 2 and nanostructures has been studied, the effect of alkali on TiO 2 morphology types, sizes and photocatalytic performance is still unavailable.…”

Section: Introductionmentioning

confidence: 99%

Effects of Particle Size on the Structure and Photocatalytic Performance by Alkali-Treated TiO2

et al. 2020

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Particle size of nanomaterials has significant impact on their photocatalyst properties. In this paper, TiO 2 nanoparticles with different crystalline sizes were prepared by adjusting the alkali-hydrothermal time (0-48 h). An annealing in N 2 atmosphere after hydrothermal treatment caused TiO 2 reduction and created defects, resulting in the visible light photocatalytic activity. The evolution of physicochemical properties along with the increase of hydrothermal time at a low alkali concentration has been revealed. Compared with other TiO 2 samples, TiO 2 -24 showed higher photocatalytic activity toward degrading Rhodamine B and Sulfadiazine under visible light. The radical trapping and ESR experiments revealed that O 2•is the main reactive specie in TiO 2 -24.Large specific surface areas and rapid transfer of photogenerated electrons are responsible for enhancing photocatalytic activity. The above findings clearly demonstrate that particle size and surface oxygen defects can be regulated by alkali-hydrothermal method. This research will deepen the understanding of particle size on the nanomaterials performance and provide new ideas for designing efficient photocatalysts.

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“…2016, 42 (12): 8039-8053. doi:10.1007/s11164-016-2577 -9 expanded the field of application of TiO 2 [8][9][10][11][12]. Recently several methods were investigated for the purpose to obtain TiO 2 in the shape of micro and nanoparticles with different morphologies such as nanotubes [13], nanofibers [14], or spheres [15]. Moreover, pure TiO 2 nanoparticles are difficult to be recycled and rapidly lose their effective surface area during their catalytic applications [16,17].…”

Section: Introductionmentioning

confidence: 99%

Structural and textural features of TiO2/SAPO-34 nanocomposite prepared by the sol–gel method

et al. 2016

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This paper focuses on the synthesis of nanocomposite materials TiO 2 /SAPO-34 using the sol-gel method, which involves preparing a mixture between as-synthesized or calcined SAPO-34 zeolite and TiO 2 gel under hydrothermal crystallization and then calcined at 400 °C for the formation of TiO 2 anatase phase. The structural and textural features of the obtained materials were determined by various physico-chemical techniques such as thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electronic microscopy (SEM), Nitrogen sorption at 77 K, energy dispersive X-ray analysis (EDX) and ultravioletvisible (UV-vis). The DRX results showed that calcination at 400 °C of the mixture between calcined SAPO-34 and TiO 2 gel led to the collapse of the original framework of zeolite but forms the anatase TiO 2 in a nano-spherical morphology, but the use of as-synthesized SAPO-34 supports provides a mixture phase between SAPO-34 and TiO 2 anatase after calcination. The photocatalytic properties of SAPO-34/TiO 2 andTiO 2 type materials were tested for the removal of methylene blue (MB) dye. The MB degradation proved to be increasing as a function of contact time, catalyst mass and the initial concentration of MB.

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Formation and evolution of TiO2 nanotubes in alkaline synthesis

Cited by 64 publications

References 25 publications

Magnetoelastic Humidity Sensors with TiO2 Nanotube Sensing Layers

Magnetoelastic Humidity Sensors with TiO2 Nanotube Sensing Layers

Effects of Particle Size on the Structure and Photocatalytic Performance by Alkali-Treated TiO2

Structural and textural features of TiO2/SAPO-34 nanocomposite prepared by the sol–gel method

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