Stimulated by the excellent colossal permittivity (CP) behavior achieved in In+Nb co-doped rutile TiO 2, in this work we investigate the CP behavior of Ga and Nb co-doped rutile TiO 2, i.e., (Ga 0.5 Nb 0.5) x Ti 1–x O 2, where Ga 3+ is from the same group as In 3+ but with a much smaller ionic radius. Colossal permittivity of up to 10 4 –10 5 with an acceptably …
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The observations show that the R-TiO 2 NR@CNTs exhibit typical rutile TiO 2 electrochemical behavior for LIB anode materials. ... As shown in Fig. 4a, rutile TiO 2 showed a small absorbance for visible light with a wavelength (λ) close to 400 nm, which was consistent with the absorbance calculated based on the energy band gap of rutile ...
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Anatase/rutile mixed-phase TiO 2 nanoparticles were synthesized through a simple sol-gel route with further calcination using inexpensive titanium tetrachloride as a titanium source, which effectively reduces the production cost. The structural and optical properties of the prepared materials were characterized by X-ray diffraction (XRD), …
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Abstract. The behavior of electrons in the conduction band of TiO 2 and other transition-metal oxides is key to the many applications of these materials. …
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For the rutile TiO 2 (110) surfaces ... (110) surface. 68,69 Thus, we have performed the wetting behavior simulation of the rutile TiO 2 (110) surface with 5% and 10% covering ratios of –OH groups, by randomly planting the –OH groups on the solid surfaces. The contact angle of the water droplet on the water bilayer decreased to 19° at a ...
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Abstract. This work investigates the synthesis, chemical composition, defect structures and associated dielectric properties of (Mg 2+, Ta 5+) co-doped rutile TiO 2 …
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The adsorption behavior of 9-anthracenecarboxylic acid (AnCA) on a rutile TiO 2 (110) surface has been investigated with scanning tunneling microscopy (STM) at room temperature. Upon deposition, the molecules adsorb, resulting in a commensurate herringbone c-(2 × 2) structure, as confirmed by low-energy electron diffraction (LEED).
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In this study, TiO 2 was synthesized by a sol-gel method and the change in its crystal structure with increasing calcination temperature was analyzed by XRD. The crystal structure of TiO 2 was started to change from anatase phase to rutile phase as calcined at above 550 °C, and was rutile phase at 800 °C.
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Rutile TiO 2 nanoparticles with aspect ratio of 0.2 ... Although the same perovskite material was used for both rutile and anatase TiO 2, the difference in electronic behavior indicates that photo-excited electrons …
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Colossal permittivity (CP) materials have many important applications in electronics but their development has generally been hindered due to the difficulty in achieving a relatively low dielectric loss. In this work, we report an In + Ta co-doped TiO2 material system that manifests high dielectric permittiv
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In this work, (Ho, Ta) co-doped rutile TiO 2 ceramics with various dopant concentrations were prepared by solid-state reaction method. The effect of (Ho, Ta) co …
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The planar spacing calculated from the diffraction peak is 0.2958 nm. Based on the Powder Diffraction File (PDF) of TiO 2 (rutile (PDF#21-1276), anatase (PDF#21-1272), and brookite (PDF#39-1360)), the diffraction peak of the film can be indexed as the (002) plane of rutile TiO 2, the (213) plane of anatase TiO 2, or the (502) plane of …
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Titanium dioxide (TiO 2) with rutile structure is a wide-gap (E g ∼ 3.0 eV), n-type semiconductor, transparent in the optical (visible) wavelength range and diamagnetic [].In the last decades, thin films of TiO 2 were extensively studied because of their excellent photocatalytic properties [].Considerable effort has been made to enhance photocatalytic …
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The complex permittivity ( ε *) plot of 0.5% Mg + Ta co-doped rutile TiO 2 fitted with the Debye model and the Havriliak-Negami (H-N) model. Full size image. In addition to the main relaxation ...
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At pH 12, the degradation increased to 60%, while the lowest degradation was 11% at pH 3. This phenomenon is explained by the amphoteric behaviour of the rutile-phase TiO 2 film during the reaction. Jalil et al. reported that for rutile-phase TiO 2, the point of zero charge (pH zpc) is pH 6 .
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behavior achieved in In+Nb co-doped rutile TiO 2, in this work we investigate the CP behavior of Ga and Nb co-doped rutile TiO 2, i.e., (Ga 0.5 Nb 0.5 ) x Ti 1 − x O 2, where Ga 3+ is from the ...
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There are few studies on TiO 2-coated NCM-424 (LiNi 0.4 Co 0.2 Mn 0.4 O 2) material in which the rutile phase of TiO 2 is predominantly formed as calcined at above 600 °C. Therefore, it is considered very interesting to coat the surface of NCM-424 with TiO 2 if the electrochemical properties of NCM-424 change according to the heat treatment ...
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Abstract. Stimulated by the excellent colossal permittivity (CP) behavior achieved in In+Nb co-doped rutile TiO 2, in this work we investigate the …
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(In + Nb) co-doped TiO 2 (TINO) films with a rutile structure have been prepared on m-plane sapphire substrates using a pulsed laser deposition method. The film growth mode and the atomic-scale microstructure of the TINO/sapphire heterostructure have been investigated by advanced electron microscopy techniques. The crystallographic …
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The so-called "nanorutile TiO 2 high performance anode material" is somewhat misleading. Below 1.2 V, rutile undergoes an irreversible phase transformation into disordered rock salt-type c-LiTiO 2.During repeated charge-discharge cycling in the 3.0–1.0 V range, the cubic structure of LiTiO 2 is retained. It is capable of reversibly …
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Rutile TiO2 Crystal morphology Photodegradation Growth from solutions 1. Introduction TiO2is one of the mostly studied semiconductors from both fundamental and …
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Morphological control and photodegradation behavior of rutile TiO2 prepared by a low-temperature process - ScienceDirect Abstract Introduction Section snippets …
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Titanium dioxide (TiO 2) is of considerable interest as a photocatalyst and a catalyst support.Surface hydroxyl groups (OH) are the most common adsorbates on the TiO 2 surface and are believed to play crucial roles in their applications. Although the characteristics of bridging hydroxyl (OH br) have been well understood, the adsorption …
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TiO 2 powders have been widely used for photocatalysts; however, why anatase shows higher activity than rutile has been a long-standing question. Here, we have elucidated the difference in the behavior of photogenerated electrons and holes by time-resolved visible to mid-IR absorption spectroscopy.
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R,R-tartaric acid (RR-TA) thermal stability and decomposition on the rutile TiO 2 (110) surface was investigated by temperature programmed desorption. The authors show that a majority of RR-TA molecules are desorbed intact from multilayers at around 340 K, while they decompose from the first chemisorbed layer between 460 and 480 K. …
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Fig. 1 shows the X-ray powder diffraction results, revealing that both of the TiO 2 and 3 mol% (Nb+In) co-doped TiO 2 ceramics are of pure rutile phase and no remark of secondary phase appear. Fig. 2 shows the Raman spectra of the samples. There are four Raman active fundamental modes in rutile TiO 2: B 1g (143 cm −1), E g (447 cm −1), A …
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Anatase TiO 2 is a widely investigated photocatalyst; however, it can only work under ultraviolet (UV) light with wavelengths less than 390 nm (band gap 3.2 eV). Rutile TiO 2 can absorb visible light at wavelengths less than 410 nm (band gap 3.0 eV); however, its photocatalytic activity is not high. Herein, we activated rutile TiO 2, which …
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Finally, since RuO 2 /TiO 2 (110) is the first known stoichiometric superconductor within the rutile family, further optimization of the superconductivity may enable the creation of structures ...
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Note that if Ti_sv POTCAR (12 valence electrons) is used instead, there will be three imaginary modes at Gamma point, one of which resembles the A 2u mode that is responsible for the incipient ferroelectric behavior in rutile TiO 2. To remove the imaginary modes, either DFT+U or LDA should be used. The lattice constants from different …
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FIGURE 2.Scaling relations of the binding energies of the OER intermediates (i.e., OH *, O *, and OOH *) with the binding energy of OH *, which is the first intermediate for the OER.The diagrams contain the binding energies on the (110) surface of (A) all rutile-type oxides in this study, (B) MO 2, and (C) MO 2 /TiO 2 heterostructures, respectively. …
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understanding and acquiring knowledge of the behavior of defects and impurities in materials. Valentin et al.27 performed DFT calculations within the generalized gradient approxima-tion (GGA)28 to study various possible C doping species in both anatase and rutile TiO 2. In rutile, they found that carbon atoms
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Sample TiO 2 –3M, with a high rutile and brookite content, is among the most active in the TiO 2 –XM series, but its activity is likely limited because of the low anatase content. Samples TiO 2 –1M and TiO 2 –7M show very similar catalytic behavior because they have very similar phase compositions and band gap energies.
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The high-pressure behavior of nanoporous rutile TiO 2 was studied at room temperature using in situ synchrotron X-ray diffraction and Raman spectroscopy.It was found that the nanoporous rutile TiO 2 starts to transform to the baddeleyite phase at a pressure of 10.8 GPa. The phase transition pressure is obviously different from those of rutile …
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The as-created local electron-pinned defect dipoles (EPDD) in (In, Nb)-codoped rutile TiO 2 ceramics can exhibit a quasi-intrinsic behavior within the grains, resulting in a colossal permittivity (CP, > 10 4) and a low dielectric loss (mostly < 0.05) of up to 100 KHz over a broad temperature range of 80–450 K [2].
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TiO 2 is a very stable and compatible material; thus finds its applications in food processing, drugs, sunscreen components, inks, paints, and as a colorant in plastics industries. 1 Four phases of TiO 2, namely rutile, anatase, brookite, and TiO 2-B (Bronze), occurred naturally. 2 The literature revealed that, at ambient pressure, rutile is more …
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Hydroxylation of the rutile TiO$_2$ (110) surface has attracted much attention as the excess unpaired electrons introduced by hydroxyls play a critical role in surface chemistry and photocatalysis ...
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