Neodymium ion dopant effects on the phase transformation in sol–gel derived titania nanostructures

Burns, Andrew; Hayes, G.H.; Li, W; Hirvonen, James K.; Demaree, J. D.; Shah, S. İsmat

doi:10.1016/j.mseb.2004.04.008

Cited by 121 publications

(96 citation statements)

References 30 publications

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“…The changes in lattice parameter on doping were reflected in the slight elongation of 'c' axis while 'a' and 'b' remained almost constant. Since only 'c' parameter was changing marginally, it can be concluded that the dopants occupied bcc and fcc positions in the anatase structure [14].…”

Section: Resultsmentioning

confidence: 94%

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Devi

Murthy

Kumar

2010

Materials Science and Engineering: B

148

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a b s t r a c tAnatase TiO 2 was prepared by sol-gel method through the hydrolysis of titanium tetrachloride and doped with transition metal ions like V 5+ and Zn 2+ . The photocatalysts were characterized by various analytical techniques. Powder X-ray diffraction studies revealed only anatase phase for the doped samples. The band gap absorption for the doped samples showed red shift to the visible region (∼456 nm) as confirmed by UV-vis absorption spectroscopy and diffuse reflectance spectral studies. The surface area of the Zn 2+ doped samples were higher than the V 5+ doped samples as observed by BET surface area measurements due to their smaller crystallite size. Scanning electron microscopy showed almost similar morphology, while energy dispersive X-ray analysis confirmed the presence of dopant in the TiO 2 matrix. The photocatalytic activities of these catalysts were tested for the degradation of Congo Red under solar light. Although both the doped samples showed similar red shift in the band gap, Zn 2+ (0.06 at.%) doped TiO 2 showed enhanced activity and its efficiency was five fold higher compared to Degussa P-25 TiO 2 . This enhanced activity was attributed to smaller crystallite size and larger surface area. Further completely filled stable electronic configuration (d 10 ) of Zn 2+ shallowly traps the charge carriers and detraps the same to the surface adsorbed species thereby accelerating the interfacial charge transfer process.

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Section: Resultsmentioning

confidence: 94%

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Devi

Murthy

Kumar

2010

Materials Science and Engineering: B

148

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“…The X-ray diffraction spectrums (XRD) were illustrated in Figure 1 for the doped and undoped samples after annealing process, which show that prepared samples have polycrystalline structure in Anatas phase [10][11][12].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Yb3+ Doped TiO2 Nano Particles Powder as IR Filter via Sol-Gel

Hamza¹,

Khalil²,

Yaseen³

2013

AMPC

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Ytterbium doped TiO 2 nano-particles were prepared via Sol-Gel Technique under varying conditions to investigate the effects of Ytterbium ion doping on the Titania optical properties in MID IR range. X-ray diffraction analyses show that prepared Yb 3+ doped TiO 2 samples have polycrystalline structure in Anatas phase. FTIR spectrums for pure and doped samples after annealing process show a single transmission peak at wave number around 1145 cm −1 . Transmission rate of this peak depends on Yb 3+ concentrations and its value rises from 1.82% (for pure TiO 2 ) to 58.1% (for doped with 1.13 wt% Yb 3+ ). Slightly peak shift occurs at a lower doping rate with no further response to higher concentration rate. FTIR spectra gives a good indication in direction of preparation of optical band-pass filter at a wavelength around 8.733 µm (~1145 cm ).

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“…All these valves are much lower than the reported activation energy value for the bulk, which is 350-700 kJ/mol. 38 This is expected as the nanosize grains cause higher surface area to volume ratios compared to the bulk, which increases the total surface energy and effectively reduces the E a for anatase to rutile transformation. The lowering of the activation energy with the increase in the Co concentration leads to a decrease in the transformation temperature of anatase to rutile.…”

Section: Resultsmentioning

confidence: 99%

Effect of Cobalt Doping on the Phase Transformation of TiO2 Nanoparticles

Barakat

Hayes²,

Shah³

2005

J. Nanosci. Nanotech.

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Co-doped TiO 2 nanoparticles containing 0.0085, 0.017, 0.0255, 0.034, and 0.085 mol % Co(III) ion dopant were synthesized via sol-gel and dip-coating techniques. The effects of metal ion doping on the transformation of anatase to the rutile phase have been investigated. Several analytical tools, such as X-ray diffraction (XRD), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), and energy dispersive X-ray analysis (EDAX) were used to investigate the nanoparticle structure, size distribution, and composition. Results obtained revealed that the rutile to anatase concentration ratio increases with increase of the cobalt dopant concentration and annealing temperature. The typical composition of Co-doped TiO 2 was Ti 1−x Co x O 2 , where x values ranged from 0.0085 to 0.085. The activation energy for the phase transformation from anatase to rutile was measured to be 229, 222, 211, and 195 kJ/mole for 0.0085, 0.017, 0.0255, and 0.034 mol % Co in TiO 2 , respectively.

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Neodymium ion dopant effects on the phase transformation in sol–gel derived titania nanostructures

Cited by 121 publications

References 30 publications

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Synthesis of Yb<sup>3+</sup> Doped TiO<sub>2</sub> Nano Particles Powder as IR Filter via Sol-Gel

Effect of Cobalt Doping on the Phase Transformation of TiO<SUB>2</SUB> Nanoparticles

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Neodymium ion dopant effects on the phase transformation in sol–gel derived titania nanostructures

Cited by 121 publications

References 30 publications

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Synthesis of Yb&lt;sup&gt;3+&lt;/sup&gt; Doped TiO&lt;sub&gt;2&lt;/sub&gt; Nano Particles Powder as IR Filter via Sol-Gel

Effect of Cobalt Doping on the Phase Transformation of TiO<SUB>2</SUB> Nanoparticles

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Synthesis of Yb<sup>3+</sup> Doped TiO<sub>2</sub> Nano Particles Powder as IR Filter via Sol-Gel