Tunable TiO2 (anatase and rutile) materials manufactured by mechanical means

Savio, A.K.P.D.; Starikov, D.; Bensaoula, A.; Pillai, R.; García, L.; Hernández, Francisco C. Robles

doi:10.1016/j.ceramint.2011.12.067

Cited by 20 publications

(9 citation statements)

References 27 publications

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“…These results are in agreement with those obtained by the XRD and SEM analyses and can be attributed to the largest crystal growth caused by the increase of the quantity of supplied Table 3. All of the samples presented a band gap value of 3.3 eV, which is lower than the range of values of 3.52-3.60 reported by Yhosida et al [5] and very similar to the band gap of TiO 2 (3.2 eV), which is widely used as a photocatalyst [20][21][22]. Given that materials with low band gap values can be activated at longer wavelengths, the synthesized potassium hexatitanate fibers can exhibit photocatalytic activity when they are irradiated with UV light at a wavelength of 375.7 nm; this finding agrees with the results reported by Manyu et al [23], who stated that potassium hexatitanate is a lower band gap semiconductor.…”

Section: Samplementioning

confidence: 60%

Synthesis and characterization of potassium hexatitanate using boric acid as the flux

Ponce-Peña

González-Lozano

Escobedo-Bretado

et al. 2015

Ceramics International

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Section: Samplementioning

confidence: 60%

Synthesis and characterization of potassium hexatitanate using boric acid as the flux

Ponce-Peña

González-Lozano

Escobedo-Bretado

et al. 2015

Ceramics International

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“…The ∼20 Å thick native oxide that spontaneously forms on fresh Ti surfaces exposed to air is largely composed of TiO 2 , which is essentially an insulator since it has a band gap of 3.7 eV . Crystalline forms of this passivation layer are of interest as a dielectric material in electronic device structures .…”

Section: Resultsmentioning

confidence: 99%

Conversion of Metallic Single-Walled Carbon Nanotube Networks to Semiconducting through Electrochemical Ornamentation

2013

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Field-effect transistors (FETs) that incorporate single-walled carbon nanotube (SWNT) networks experience decreased on-off current ratios (I(on)/I(off)) due to the presence of metallic nanotubes. Herein, we describe a method to increase I(on)/I(off) without the need for either specialized SWNT growth methods or post growth processing steps to remove metallic nanotubes. SWNTs that were grown using conventional arc discharge methods were deposited from aqueous suspension. Then, the SWNTs in the network were decorated with Cu2O nanoparticles that acted as controllable valves that restricted current flow at positive gate voltages. This resulted in an unprecedented reduction in I(off), as the sub-10 nm sized nanoclusters acted as numerous tunable valves, providing greatly improved network sensitivity to gate voltages in the relatively small range of ±10 V, increasing I(on)/I(off) by up to 205-fold. Larger nanoclusters were found to increase the network conductivity but decrease I(on)/I(off). The ability to convert metallic SWNTs to semiconducting without removing them allows for enhanced I(on) and lower noise while still achieving greatly enhanced magnitudes of I(on)/I(off).

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“…Anatase and rutile contents of the titania photocatalysts were calculated using Spurr-Myers equation (Eq. 4) 28 as it has been widely found applicable 29,30 .…”

Section: Catalyst Characterization Using Xrdmentioning

confidence: 99%

SYNTHESIS OF EOSIN Y-SENSITIZED Ag-TiO2 NANO-HYBRID FOR OPTIMIZED PHOTOCATALYTIC DEGRADATION OF AQUEOUS CAFFEINE

Ibrahim

Gaya

2019

J. Chil. Chem. Soc.

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The visible light spectral response of titania nanoparticles synthesized by hybrid treatment of TiO 2 with silver dopant and Eosin Y-sensitizer was evaluated using caffeine, an emerging pollutant. The photocatalyst was characterized using scanning electron microscopy (SEM), x-ray diffraction (XRD), solid state UV/ Visible spectrometry and Fourier transform infrared spectrometry (FTIR). Upon sensitization and doping, downsizing, increase in surface area and redshift were observed without significant annihilation of the tetragonal anatase and rutile structures. Factors affecting the degradation of caffeine were studied using Taguchi orthogonal array model and optimized using a response surface methodology (RSM) based on faced-centered composite design (FCCD). Caffeine degradation under the conditions of the study was not affected significantly by temperature but pH, initial concentration and catalyst concentration. Evidence for electron injection and red shift with sensitization was corroborated using quantum calculations at DFT/B3LYP level of the theory.

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Tunable TiO2 (anatase and rutile) materials manufactured by mechanical means

Cited by 20 publications

References 27 publications

Synthesis and characterization of potassium hexatitanate using boric acid as the flux

Synthesis and characterization of potassium hexatitanate using boric acid as the flux

Conversion of Metallic Single-Walled Carbon Nanotube Networks to Semiconducting through Electrochemical Ornamentation

SYNTHESIS OF EOSIN Y-SENSITIZED Ag-TiO2 NANO-HYBRID FOR OPTIMIZED PHOTOCATALYTIC DEGRADATION OF AQUEOUS CAFFEINE

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