Investigation of electronic structure of Nd-doped TiO2 nanoparticles using synchrotron radiation photoelectron spectroscopy

Hou, Tinghong; Mao, Jian; Pan, Haibing; Ming-jing, TU

doi:10.1007/s11051-005-9020-2

Cited by 12 publications

(4 citation statements)

References 15 publications

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“…First, the difference in ionic radii of Ti þ4 and Nd þ3 may be a contributing factor; however, there are many reports where texturing was not observed by doping Nd in TiO 2 . 8,13,16,17,19,20 Second, and more likely, reason could be the slow growth rate of sputtering, a well known technique for atomically smooth growth. In the present case, the growth rate was 0.6 Å /s, which perhaps helped the preferred orientation growth well supported by a constant substrate temperature of 500 C. This might have helped in the adatoms to find minimum energy surface sites to continue the accelerated growth of (004) planes only.…”

Section: A Scanning Electron Microscopymentioning

confidence: 99%

“…These structures are synthesized by various growth mechanisms including metallorganic chemical vapor deposition (MOCVD), chemical vapor deposition (CVD), sol gel, co-precipitation, etc. 8,[16][17][18][19][20] Nd usually forms a trivalent state in TiO 2 lattice with a rutile like local structure that causes distortion in lattice with elongation of c-axis. Nd-doped TiO 2 has shown very efficient photocatalytic degradation properties as compared to some of the other dopants.…”

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confidence: 99%

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Improvement of (004) texturing by slow growth of Nd doped TiO2 films

Ali

Yassitepe

Ruzybayev

et al. 2012

Journal of Applied Physics

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Enhancement of optical absorption by modulation of the oxygen flow of TiO2 films deposited by reactive sputteringIn this work, we present preferred (004) texturing of sputter deposited titanium dioxide (TiO 2 ) films on glass substrates as a consequence of Nd doping at very slow growth rate. Nd concentration was varied from 0.0 to 2.0 atomic percent (at. %) in TiO 2 thin films deposited under identical growth conditions, i.e., the growth rate of 0.6 Å /s and at 500 C. At 2 at. % Nd, complete texturing along (004) plane was observed, as indicated by the X-ray diffraction analyses. Morphology of the deposited TiO 2 films from pure to 2 at. % Nd doped TiO 2 films showed faceted to planar growth. Visualization of electrical and structural analysis (VESTA) software revealed that the change in the morphology was due to preferential growth in (004) orientation. Raman spectroscopy highlighted the phonon confinement in the Eg mode, and a red shift was observed due to an increase in the anti-symmetry in bonding with increased Nd concentration. XPS results confirmed the variation in oxygen vacancy concentration along with the reduction of Ti and Nd valance states with the change in the dopant concentration. Our experiments confirmed that the substitution of Nd at Ti sites was responsible for texturing in (004) orientation and this was possible by growing films at a very slow rate. V C 2012 American Institute of Physics. [http://dx.

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Section: A Scanning Electron Microscopymentioning

confidence: 99%

mentioning

confidence: 99%

Improvement of (004) texturing by slow growth of Nd doped TiO2 films

Ali

Yassitepe

Ruzybayev

et al. 2012

Journal of Applied Physics

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“…However, the investigation on Nd-doped TiO 2 photoanode in DSSC under theoretical investigation is not reported yet. At the same, it comes with difficulty to make a direct comparison and draw conclusion due to various experimental conditions and different methods for sample preparation of Nd-doped TiO 2 [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Structural, Electronic and Optical Properties of Nd-Doped Anatase TiO2 for Dye-Sensitized Solar Cells from Density Functional Theory

Samat

Hussin

Taib

et al. 2016

MSF

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The structural, electronic and optical properties of pure and neodymium (Nd) doped anatase titanium dioxide (TiO2)are investigated via first-principles calculations within density functional theory (DFT) approach. The band gap reduces to ~0.398 eV when Ti4+ is substituted with Nd3+ in TiO2 crystal structure. The presence of Nd 4f states in the conduction band of TiO2 clarifies the reducing of the band gap. The dielectric constant and refractive index of Nd-doped TiO2 increase compare to pure TiO2. Nd-doped TiO2 able to enhance light absorption to longer wavelength spectrum. The first-principles results obtained satisfy the criteria for Nd-doped TiO2 to become feasible photoanode material in dye-sensitized solar cell (DSSC) device.

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“…10 The use of Nd dopants in TiO 2 has been reported to provide photocatalysts with high activities toward organic compound degradation. Mahboob et al 11 12 investigated the properties of NdTiO 2 , which exhibits a different electronic structure and narrower band-gap of TiO 2 ; synchrotron radiation photoelectron spectroscopic analysis of Nd-TiO 2 revealed the existence of different structures and peak positions in the valence band spectrum with varying dopant concentrations. Yang et al 13 reported an enhanced and selective nitrate reduction by neodymium (Nd), N -codoped TiO 2 under visible light irradiation for the removal of aqueous nitrate.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic Performance of a Nd–SiO2–TiO2 Nanocomposite for Degradation of Rhodamine B Dye Wastewater

Li¹,

Liu²,

Sui³

et al. 2015

j nanosci nanotechnol

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The photocatalytic performance of a novel Nd-SiO2-TiO2 nanocomposite catalyst prepared by a sol-gel method was examined in the degradation of Rhodamine B (RhB), a notorious organic compound present in dye wastewaters. The prepared samples were characterized by low-temperature N2 adsorption, X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV-vis diffuse reflectance spectroscopy (DRS). Fourier-transform infrared (FT-IR) spectroscopic analysis indicated the enhanced chemical bonding of O--Ti and O--Ti--O with introduction of Nd and SiO2 dopant species into TiO2. The Nd-SiO2-TiO2 nanocomposite was found to exhibit a much higher photo- catalytic activity toward the decomposition of RhB under both UV and visible light irradiation as compared to a commercial TiO2 photocatalyst. The photodegradation efficiency of RhB (5 mg/L) was greater than 93% under visible light irradiation after 90 min. Addition of SiO2 was shown to not only inhibit crystal growth and TiO2 anatase-to-rutile phase transformation, but also enhance the adsorption of organic compounds. Nd doping has been suggested for slowing down the radiative recombination of photo-generated electrons and holes in TiO2, extending the photocatalyst light response to the visible region. The synergetic effects between Nd-SiO2 and TiO2 are described; the prepared Nd-SiO2-TiO2 represents a noteworthy contribution to the study of pollutant degradation in dye wastewaters.

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Investigation of electronic structure of Nd-doped TiO2 nanoparticles using synchrotron radiation photoelectron spectroscopy

Cited by 12 publications

References 15 publications

Improvement of (004) texturing by slow growth of Nd doped TiO2 films

Improvement of (004) texturing by slow growth of Nd doped TiO2 films

Structural, Electronic and Optical Properties of Nd-Doped Anatase TiO<sub>2</sub> for Dye-Sensitized Solar Cells from Density Functional Theory

Photocatalytic Performance of a Nd–SiO<SUB>2</SUB>–TiO<SUB>2</SUB> Nanocomposite for Degradation of Rhodamine B Dye Wastewater

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