Aluminum-doped TiO2 nano-powders for gas sensors

Choi, Young Jin; Seeley, Zachary M.; Bandyopadhyay, Amit; Bose, Susmita; Akbar, Sheikh A.

doi:10.1016/j.snb.2006.12.005

Cited by 128 publications

(71 citation statements)

References 24 publications

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“…Choi et al (1994) reported that metal ion dopants in the TiO 2 crystalline matrix influence photoreactivity, charge carrier recombination rates, and interfacial electron-transfer rates. Other studies doped TiO 2 with metals such as Fe (Oh et al, 2003), Al (Choi et al, 2007), and Cu (Chiang et al, 2002;Zhang et al, 2004;Slamet et al, 2005;Colón et al, 2006;Park et al, 2006;Araña et al, 2008;Xin et al, 2008;Yoong et al, 2009) to improve the reactivity and kinetics of the catalyst. These results support that only select transition metals, including Cu 2+ , can virtually inhibit electron-hole recombination to improve the catalyst (Butler and Davis, 1993;Araña et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Tsai

Hsi

Kuo

et al. 2013

Aerosol Air Qual. Res.

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A high-quality, Cu-doped TiO 2 photocatalyst was prepared via a single-step process using an atmospheric-pressure plasma torch system. Degussa P-25 was thermally doped with Cu at Cu/(Cu + TiO 2 ) ratios of 0-5 wt.%. The raw and resulting nanoparticles were characterized using TEM, XRD, UV-Vis, and XPS. TEM showed that the particle size of plasma-treated TiO 2 was generally < 50 nm. 67-75% of the resulting particles, by number were between 10 and 20 nm. The remaining particles were < 10 nm (~10%) and between 20 and 30 nm (~10%). The XRD results showed that Cu doping decreased the anatase/rutile crystalline ratio compared to untreated P-25. Nevertheless, the greater the amount of Cu added, the greater the anatase/rutile ratio was for the Cu-doped TiO 2 . The UV-Vis results showed that the absorption wavelength for plasma-treated TiO 2 extended to the visible light range, especially for TiO 2 doped with 5 wt.% Cu.

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Section: Introductionmentioning

confidence: 99%

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Tsai

Hsi

Kuo

et al. 2013

Aerosol Air Qual. Res.

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“…This was because the ionic radius of Fe 3+ was 0.64Ǻ, and it was possible for Fe 3+ to diffuse through 0.77Ǻ channels along the c-axis to substitute Ti 4+ in the TiO 2 lattice (Deng et al 2009). The doped ions could have been highly dispersed in the TNTs (Choi et al 2007; Pang and Abdullah 2012b). As a result, broadening diffraction peaks and decreasing peak intensities were observed.…”

Section: Morphologies Of the Catalystsmentioning

confidence: 99%

Photocatalytic degradation of humic acids using substrate-supported Fe3+-doped TiO2 nanotubes under UV/O3 for water purification

Yuan

Zhou

Zhang

et al. 2015

Environ Sci Pollut Res

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In this paper, Fe 3+ -doped TiO 2 nanotubes (FeTNTs) were successfully synthesized using hydrothermal method. Four different types of substrates, more specifically, ceramsite, zeolite, activated alumina, and activated carbon (AC), have been investigated in the study. The substratesupported Fe-TNTs were used to effectively decompose humic acids (HAs) in water under O 3 /UV conditions. The experiment results show that the highest photocatalytic activity was obtained in the presence of AC-supported 1.0 atomic percent (at.%) Fe-TNTs calcined at 500°C, as HAs was removed by 97.4 %, with a pseudo-first-order rate constant of 0.126/min. The removal efficiencies of HAs reduced when the catalysts was repeatedly used, since the amount of adsorption sites of the supporting substrates decreased. However, even after the catalyst was repeatedly used for five times, the removal efficiency of HAs in the presence of AC-supported catalyst, which was 78.5 %, was still sufficient in water treatment. The enhanced photocatalytic activity of AC-supported Fe-TNTs was related to a synergistic effect of AC adsorption and Fe-TNT photocatalytic ozonation.

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“…Among these synthesis methods, the solution combustion synthesis (SCS), a redox reaction between an oxidant and a fuel, is self-sustained by its own exothermic reaction in solutions of metal nitrates and different fuels, which have proven to be very efficient and rapid for the synthesis of nanocrystalline ZnO powders. Many organic compounds such as citric acid [22], urea [23], glycine [24], chitosan [25], L-alanine [26] and polyethylene glycol [27] added in the reaction not only act as a fuel but also have a great influence on the growth, nucleation and morphology of nanoparticles. However, the main drawbacks of the nanopowders produced by 3 SCS are poor dispersion, agglomeration, and inadequate combustion.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO nanoparticles with a novel combustion method and their C2H5OH gas sensing properties

Guo

Peng

2015

Ceramics International

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Aluminum-doped TiO2 nano-powders for gas sensors

Cited by 128 publications

References 24 publications

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Preparation of Cu-Doped TiO2 Photocatalyst with Thermal Plasma Torch for Low-Concentration Mercury Removal

Photocatalytic degradation of humic acids using substrate-supported Fe3+-doped TiO2 nanotubes under UV/O3 for water purification

Synthesis of ZnO nanoparticles with a novel combustion method and their C2H5OH gas sensing properties

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