Syntheses of TiO2(B) nanowires and TiO2 anatase nanowires by hydrothermal and post-heat treatments

Yoshida, Ryuhei; Suzuki, Yoshikazu; Yoshikawa, Shinya

doi:10.1016/j.jssc.2005.04.025

Cited by 249 publications

(165 citation statements)

References 26 publications

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“…• C, the obtained product TiO 2 anatase still preserves the nanorods morphology as shown in Fig 2(c), similar to the results reported by Yoshida et al 21 The energy dispersive X-ray analysis (EDX) in Fig. 2(d) shown only the signals of Ti, O and Fe elements, indicating that no contamination element is introduced into the Fe-doped TiO 2 (B) during the sample preparation.…”

Section: Resultssupporting

confidence: 86%

Phase dependent room-temperature ferromagnetism of Fe-doped TiO2 nanorods

2012

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Fe-doped TiO2(B) and anatase phases were synthesized at different thermal treatment conditions using Fe-doped hydrogen titanate nanorods as a precursor. X-ray diffraction, Raman and Mössbauer studies ruled out the formation of secondary phase of either metallic Fe or iron oxide cluster in the samples and confirmed the ferromagnetism have originated from the defects. Mössbauer spectroscopy studies show a doublet and measured isomer shifts support the high spin Fe3+ charge state occupying the Ti4+ sites with associated changes in local lattice environment. The magnetization at room-temperature of the TiO2(B) sample is 0.020 emu/g whereas that of anatase sample is 0.015 emu/g. The decrease of magnetization with the structural phase transformation from TiO2(B) to anatase is attributed to the reduction in number of defects (oxygen vacancy) during the transformation process. Existence of these defects was further supported by the photoluminescence measurements

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Section: Resultssupporting

confidence: 86%

Phase dependent room-temperature ferromagnetism of Fe-doped TiO2 nanorods

2012

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“…Various surface modification techniques such as sol-gel [15,16], chemical vapor deposition (CVD) [17], hydrothermal [18], and anodic oxidation [19][20][21] have been used to obtain layers of TiO2 and to improve the surface properties of Ti alloys. Among the anodic oxidation methods to produce anodic TiO2 layers, electrolytic plasma oxidation (PEO) also called micro arc oxidation, is an economic, effective and useful technique widely used and studied in the last decade.…”

Section: Introductionmentioning

confidence: 99%

Osseointegration improvement by plasma electrolytic oxidation of modified titanium alloys surfaces

Echeverry‐Rendón

Galvis

Giraldo

et al. 2015

J Mater Sci: Mater Med

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Titanium (Ti) is a material frequently used in orthopedic applications, due to its good mechanical properties and high corrosion resistance. However, formation of a non-adherent fibrous tissue between material and bone drastically could affect the osseointegration process and, therefore, the mechanical stability of the implant. Modifications of topography and configuration of the tissue/ material interface is one of the mechanisms to improve that process by manipulating parameters such as morphology and roughness. There are different techniques that can be used to modify the titanium surface; plasma electrolytic oxidation (PEO) is one of those alternatives, which consists of obtaining porous anodic coatings by controlling parameters such as voltage, current, anodizing solution and time of the reaction. From all of the above factors, and based on previous studies that demonstrated that bone cells sense substrates features to grow new tissue, in this work commercially pure Ti (c.p Ti) and Ti6Al4V alloy samples were modified at their surface by PEO in different anodizing solutions composed of H2SO4 and H3PO4 mixtures. Treated surfaces were characterized and used as platforms to grow osteoblasts; subsequently, cell behavior parameters like adhesion, proliferation and differentiation were also studied. Although the results showed no significant differences in proliferation, differentiation and cell biological activity, overall results showed an important influence of topography of the modified surfaces compared with polished untreated surfaces. Finally, this study offers an alternative protocol to modify surfaces of Ti and their alloys in a controlled and reproducible way in which biocompatibility of the material is not compromised and osseointegration would be improved.

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“…In an early study by Betz et al [23], photoelectrochemical experiments characterized the polycrystalline TiO 2 (B) as an n-type semiconductor with an energy gap of ∼3.0 eV, similar to that of TiO 2 anatase (3.2 eV). Suzuki and Yoshikawa et al have studied various types of TiO 2 and related titanate 1-D nanomaterials, including TiO 2 (B) nanowires, by controlling the starting material, hydrothermal and post-thermal conditions [39][40][41][42][43]. Although preliminary photovoltaic properties of TiO 2 (B) nanowires were briefly given as a comparison in the previous papers [10,11], detailed DSC properties of TiO 2 (B) nanowires have not yet been reported.…”

Section: Introductionmentioning

confidence: 99%

Addition of TiO2 nanowires in different polymorphs for dye-sensitized solar cells

2007

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TiO 2 (B) and TiO 2 anatase nanowires were prepared at 150• C for 120 h by a hydrothermal method followed by calcination in air at 400• C for 2 h and at 700 • C for 2 h for TiO 2 (B) and TiO 2 anatase, respectively. Although dye-sensitized solar cells (DSC) with fully nanowire electrodes showed a rather low light-to-electricity conversion efficiency of 1.33 % for TiO 2 (B) and 2.42% for TiO 2 anatase, 10 wt % nanowire-dispersed electrodes in a P-25 TiO 2 -nanoparticle matrix demonstrated improved efficiency of 6.17 % for TiO 2 (B) and 6.53% for TiO 2 anatase, these exceeding that of pure P-25 electrodes in this work (η=5.59%). The dominant mechanisms of the improvement at 10 wt% for the two different polymorphs are thought to be different, i.e., a light-scattering and film-thickness increment for the TiO 2 (B) system, whereas there is an improved conduction path through the matrix for the TiO 2 anatase system.

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Syntheses of TiO2(B) nanowires and TiO2 anatase nanowires by hydrothermal and post-heat treatments

Cited by 249 publications

References 26 publications

Phase dependent room-temperature ferromagnetism of Fe-doped TiO2 nanorods

Phase dependent room-temperature ferromagnetism of Fe-doped TiO2 nanorods

Osseointegration improvement by plasma electrolytic oxidation of modified titanium alloys surfaces

Addition of TiO2 nanowires in different polymorphs for dye-sensitized solar cells

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