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Articles de revues sur le sujet « N-Doped titania »

Auteur : Grafiati
Publié le 10 mars 2023

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1

Noguchi, Shinnosuke, Toru Tokutome et Shinji Iwamoto. « Nitrification of Nb-Modified Titanias Prepared by the Solvothermal Method and their Photocatalytic Activities under Visible-Light Irradiation ». Key Engineering Materials 596 (décembre 2013) : 43–49. http://dx.doi.org/10.4028/www.scientific.net/kem.596.43.

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Niobium modified titania samples were prepared by thermal reaction of titanium tetraisopropoxide and niobium pentaethoxide in 1,4-butanediol at 300 °C (solvothermal method), and the products were nitrified in an NH3 flow at 600 °C. The physicochemical property of the thus-obtained N-and Nb-co-doped titanias and visible-light response photocatalytic activity of FeOx-loaded N-and Nb-co-doped titanias were investigated. The N-and Nb-co-doped titanias had larger absorptions in the visible-light range as compared to the only N-doped titania samples. In ESR spectra of the Nb-modified TiO2 samples annealed at 300 °C after the nitrification, signals due to Ti3+ and oxygen vacancies, which accelerate the recombination of the photo-generated electrons and holes, were clearly observed. On the other hand, for the N-and Nb-co-doped titanias annealed at 500 °C, the signals due to Ti3+ and oxygen vacancies decreased significantly. Actually, the FeOx-loaded N-and Nb-co-doped samples annealed at 500 °C exhibited a higher photocatalytic activity for a photocatalytic decomposition of acetaldehyde under visible-light irradiation.
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Oh, Han Jun. « Synthesis of N Doped Titania Photocatalyst by Using an Electrochemical Oxidation of TiN Layer ». Advanced Materials Research 651 (janvier 2013) : 302–5. http://dx.doi.org/10.4028/www.scientific.net/amr.651.302.

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In order to improve the photocatalytic efficiency, the N doped anodic titania film for photocatalyst was synthesized by anodic oxidation of TiN layer in sulfuric electrolyte, and the photocatalytic properties of N doped TiO2layer were investigated. During the oxidation process of the TiN layer, nitrogen was doped into the anodic titania film due to the change of the titanium nitride layer to TiO2layer film. In the evaluation of dye degradation, N doped titania catalyst shows much higher efficiency than non-doped titania film.
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Guo, Si Yao, Bo Chi, Jin Bing Sun, Feng Lu Wang, Lin Yang, Feng Zhang et Song Han. « Comparison of the Photocatalytic Activity of N-Doped, P-Doped Titania under Solar Light Irradiation ». Advanced Materials Research 113-116 (juin 2010) : 2141–44. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.2141.

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P-, N-doped titania were synthesized by the direct hydrothermal method, which phosphorus from phosphoric acid and the following nitridation from urea solution. The resulting materials were characterized by XRD, XPS analysis, and their photocatalytic activities were tested by the solar light irradiation. N-doping titania resulted in the band-gap narrowing with improved photocatalytic activity. However, the phosphated titania exhibited higher photocatalytic activity than the N-doped one, but with larger band-gap energy.
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Shu, Zhan, Tao Zeng et Hou Juan Liu. « Hydrothermal Treatment and its Influence on the Structure of Nitrogen Doped Titania ». Advanced Materials Research 393-395 (novembre 2011) : 1255–58. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.1255.

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N-doped titania was synthesized by a one step hydrothermal method, which is characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The samples prepared by hydrothermal method demonstrate higher photocatalytic activity toward the degradation of methylene blue under xenon lamp which has similar spectra to solar light, and also is much superior to that of the commercial P25. In addition, the samples prepared by hydrothermal treatment could severely influence the crystal lattice structure. Morever, N-doped titania can further enhacnce the photocatalytic activity effectively, and hydrothermal treatment is a very suitable method for the synthesis of N-doped titania. This excellent performance could endow the as-prepared P-doped titania potential in purifying wastewater.
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Chen, Guang Sheng, Si Yao Guo, Feng Zhang et Song Han. « Visible-Light-Driven TiO2 Catalysts Doped with Two Different Nonmetal Species by Hydrothermal Method ». Advanced Materials Research 183-185 (janvier 2011) : 591–94. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.591.

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The doping TiO2 were prepared by hydrothermal method with two different nonmetal, that is N-doped, and N, S codoped. The resulting materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). According to the test result, nitrogen and sulfur co-doped titania give a higher photocatalytic activity in the degradation of organophosphorus pesticide. It was evidenced that the incorporation N in the anatase titania lattice in the form of O–Ti–N linkages. However, we compared with N-doped and N, S codoped it was no reservation to conclude that N, S codoped titania exhibit the further enhanced photocatalytic activity.
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Tseng, Yao-Hsuan, Chien-Sheng Kuo, Chia-Hung Huang et Yuan-Yao Li. « Preparation of Visible-Light-Responsive Nitrogen-carbon Co-doped Titania by Chemical Vapor Deposition ». Zeitschrift für Physikalische Chemie 224, no 06 (1 juillet 2010) : 843–56. http://dx.doi.org/10.1524/zpch.2010.5512.

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AbstractNitrogen-doped titania (N-doped TiO2) and nitrogen-carbon co-doped titania (N-C-doped TiO2) were prepared in metal-organic chemical vapor deposition (MOCVD) processes under the controlled reaction atmosphere. The N-doped TiO2 and N-C-doped TiO2 with anatase phase were prepared at 600Â oC under N2-O2-NH3 and N2-NH3 atmospheres respectively. The N-C-doped TiO2 exhibited the high photocatalytic activity for the oxidation of NO under visible-light illuminations. The chamber atmosphere in the MOCVD process plays an important role on the surface lattice structure and nitrogen and carbon content of TiO2. The nitrogen and carbonaceous species on the TiO2 surface, evidenced from X-ray diffractometry (XRD), UV-VIS, and Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS), were inferred as important factors for narrowing band gap of titania and enhancement of its visible-light-responsive activity.
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Guo, Si Yao, Bo Chi, Jin Bing Sun, Feng Lu Wang, Lin Yang et Song Han. « Preparation, Characterization of N, P Codoped TiO2 Nanoparticles with their Excellent Photocatalystic Properties ». Advanced Materials Research 113-116 (juin 2010) : 2162–65. http://dx.doi.org/10.4028/www.scientific.net/amr.113-116.2162.

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Phosphor and nitrogen co-doped titania were prepared by hydrothermal method with phosphorous acid and ammonia as the P and N sources, respectively. The resulting materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). Phosphor and nitrogen co-doped titania give a higher photocatalytic activity in the degradation of methylene blue (MB) under solar light irradiation. It was evidenced that the incorporation of P and N in the anatase titania lattice in the form of O–Ti–N, O–P–N, and Ti–O–P linkages. After photocatalytic properties studies, we can conclude that N, P codoped titania exhibit the further enhanced photocatalytic activity.
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8

Wang, Jia, Chenyao Fan, Zhimin Ren, Xinxin Fu, Guodong Qian et Zhiyu Wang. « N-doped TiO2/C nanocomposites and N-doped TiO2 synthesised at different thermal treatment temperatures with the same hydrothermal precursor ». Dalton Trans. 43, no 36 (2014) : 13783–91. http://dx.doi.org/10.1039/c4dt00924j.

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9

Hu, Yulong, Fu Dong, Hongfang Liu et Xingpeng Guo. « Influence of Pt and Pd Modification on the Visible Light Photocatalytic Activity of N-Doped Titania Photocatalysts ». Journal of Nanoscience and Nanotechnology 16, no 4 (1 avril 2016) : 3570–76. http://dx.doi.org/10.1166/jnn.2016.11874.

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Pd and Pt modified N-doped titania nanoparticle powders were prepared by a facile sol–gel method. Nitrogen doping and metal modification were carried out simultaneously during the preparation process. The as-prepared samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), diffuse reflectance spectroscopy (DRS), photoluminescence (PL) spectroscopy and X-ray photoelectron spectroscopy (XPS). The visible light photocatalytic activities of the asprepared samples were evaluated by analyzing their effect on the photocatalytic decomposition of methyl orange (MO). The chemical state of the metal is the key factor determining the performance of metal modified N-doped titania. The Pd used to modify the N-doped titania (Pd-NT) in our study was of the PdOx(x≤2) species, which increased the absorbance in the visible light region, decreased the recombination of photo-generated electron–hole pairs, and resulted in a significant enhancement in the visible light photocatalytic activity. The Pt species used to modify the N-doped titania (Pt-NT) was mainly in the metallic state, which resulted in a decrease in the absorbance in the visible light region, and an increase in the recombination of photo-generated electron–hole pairs. Pt modification led to a deterioration in the visible light photocatalytic activity of the material.
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10

Zeng, Tao, Hou Juan Liu et Zhan Shu. « Discussion the Mechanism of Sulfur and Phosphorus Doped TiO2 ». Advanced Materials Research 393-395 (novembre 2011) : 1157–60. http://dx.doi.org/10.4028/www.scientific.net/amr.393-395.1157.

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Environmental pollution has become one of the most serious problems with the development of the world. TiO2 has caused great concern due to its excellent effort on the environmental purification and solar energy conversion. N, S-doped titania were prepared by a one-pot hydrothermalmethod using urea and sulfourea as precursor of nitrogen and sulfur. The samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of them was evaluated for the degradation of methylene blue under xenon lamp which has similar spectra to solar light. The preparation methods and doping mechanism of the nitrogen-doped TiO2 are discussed. Morever, N, S-codoped titania can further enhacnce the photocatalytic activity effectively, This excellent performance could endow the as-prepared P-doped titania potential in purifying wastewater.
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11

Liu, Wenxing, Tianhao Yao, Sanmu Xie, Yiyi She et Hongkang Wang. « Integrating TiO2/SiO2 into Electrospun Carbon Nanofibers towards Superior Lithium Storage Performance ». Nanomaterials 9, no 1 (5 janvier 2019) : 68. http://dx.doi.org/10.3390/nano9010068.

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In order to overcome the poor electrical conductivity of titania (TiO2) and silica (SiO2) anode materials for lithium ion batteries (LIBs), we herein report a facile preparation of integrated titania–silica–carbon (TSC) nanofibers via electrospinning and subsequent heat-treatment. Both titania and silica are successfully embedded into the conductive N-doped carbon nanofibers, and they synergistically reinforce the overall strength of the TSC nanofibers after annealing (Note that titania–carbon or silica–carbon nanofibers cannot be obtained under the same condition). When applied as an anode for LIBs, the TSC nanofiber electrode shows superior cycle stability (502 mAh/g at 100 mA/g after 300 cycles) and high rate capability (572, 518, 421, 334, and 232 mAh/g each after 10 cycles at 100, 200, 500, 1000 and 2000 mA/g, respectively). Our results demonstrate that integration of titania/silica into N-doped carbon nanofibers greatly enhances the electrode conductivity and the overall structural stability of the TSC nanofibers upon repeated lithiation/delithiation cycling.
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12

Gu, Song Tao, Xin Wang, Qiang Liu, Hao Quan Liu, Gui Jun Jiang et Meng Zhou. « Photocatalytic Reduction of Methyl Orange Using Titania Photocatalyst Codoped with Nitrogen and Gadolinium under Visible Light Illumination ». Advanced Materials Research 79-82 (août 2009) : 2127–30. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.2127.

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A visible-light-active nitrogen and gadolinium codoped TiO2 catalyst was synthesized by the sol-gel route. For comparison, Gd-doped sample, N-doped sample, and pure titania were prepared through the same method, without adding the corresponding dopants. The as-prepared photocatalysts were characterized by X-ray diffraction (XRD) and Uv-vis spectra. The results showed that the codoped photocatalyst exhibited a smaller size than the undoped titania. The transformation from anatase to rutile was suppressed by doping with N and Gd atoms. Furthermore, the absorbance spectra of N, Gd-codoped TiO2 exhibited a significant red shift to the visible region. The photocatalytic activity of N, Gd-codoped TiO2 was evaluated by photodegradation of methyl orange under visible light irradiation. This codoped sample exhibited enhanced photocatalytic activity compared to N-doped TiO2, Gd-doped TiO2, and pure TiO2. The improvement of the photocatalytic activity was ascribed to the synergistic effects of the N and Gd co-doping.
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13

Khanam, Rizwin, et Dambarudhar Mohanta. « Influence of mild Cr3+ doping on the structural, optical, photochromic, and thermochromic reversibility of nano-titania systems ». Canadian Journal of Physics 97, no 4 (avril 2019) : 347–54. http://dx.doi.org/10.1139/cjp-2017-0533.

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We report on the effect of chromium doping on the band gap lowering of nano-titania (TiO2) and subsequent implications as regards coloration characteristics mediated via photochromism and thermochromism processes. As can be found in the X-ray diffractograms, the sol-gel derived, Cr3+-doped nano-TiO2 systems have exhibited an anatase phase with the evidence of peak shifting towards a lower diffraction angle. The average crystallite size decreases, whereas lattice unit cell parameters and, consequently, cell volume, tend to increase with the inclusion of Cr3+ into the titania host. To be specific, 1% Cr-doped titania system showed nearly 5.8% cell expansion as compared to its un-doped counterpart. As revealed from the optical absorption spectroscopy, a narrowing of band gap is observed for the Cr doped nano-titania system: 3.18 eV for the un-doped system, and 2.61 and 2.41 eV for 0.3% and 1% Cr doping cases, respectively, considering direct band-to-band transitions. Moreover, doping led noticeable lowering of the exponent (n value), from its normal value, which suggests inclusion of adequate non-parabolicity feature to the energy band scheme. The photochromic feature, for a given incident radiation, demonstrates a lowered transmission response with increasing Cr content. A reversible thermochromism response has also been demonstrated for doped nano-titania systems subjected to heating with temperature varying between 0–55 °C. The Cr3+ doped nano-titania and similar systems would find scope in smart windows, display components, photocatalysis, etc., when a select coloration is desired.
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14

Jang, Jum Suk, Eun Sun Kim, Hyun Gyu Kim, Sang Min Ji, Youngkwon Kim et Jae Sung Lee. « Nitrogen-doped titanium oxide microrods decorated with titanium oxide nanosheets for visible light photocatalysis ». Journal of Materials Research 25, no 6 (juin 2010) : 1096–104. http://dx.doi.org/10.1557/jmr.2010.0133.

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Nitrogen-doped titania with a unique two-level hierarchical structure and visible light photocatalytic activity is reported. Thus, nitrogen-doped titanium oxide microrods decorated with N-doped titanium oxide nanosheets were synthesized by a hydrothermal reaction in NH4OH and postcalcination. During the calcination, the in situ incorporation of nitrogen atoms of ammonium ion into titania lattice was accompanied by the structural evolution from titanate to anatase titania. The morphological and structural evolution was monitored by scanning electron microscopy (SEM), x-ray diffraction (XRD), thermogravimetric analysis/differential thermal analysis (TGA/DTA), Raman, Fourier transform infrared (FTIR), x-ray absorption near edge structure (XANES), x-ray photoelectron spectroscopy (XPS), and adsorption isotherms. The N-doping brought visible light absorption, and the material exhibited high photocatalytic activity in the decomposition of Orange II under visible light irradiation (λ ≥ 400 nm), especially when it was loaded with 1 wt% Pt as a cocatalyst.
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Zhou, Hong Quan, Xiao Ping Zou, Gang Qiang Yang, Gong Qing Teng, Zong Bo Huang et Bao Li Zhang. « Affection of Post-Nitrogen-Doping of TiO2 Nanoparticle Film Photo-Anode on Performance of Dye-Sensitized Solar Cells ». Advanced Materials Research 875-877 (février 2014) : 300–303. http://dx.doi.org/10.4028/www.scientific.net/amr.875-877.300.

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A nitrogen-doped titania nanoparticle film on an ITO substrate was successfully obtained by gas phase method. Such a nitrogen-doped titania nanoparticle film on an ITO substrate shows efficient at the responsivity under the visible light exposure. TiO2 photo-anode with N-doped was fabricated using nanocrystalline pastes and their N719-sensitization led to a short-circuit photocurrent density of 3.95 mA/cm2 and a solar energy conversion efficiency of 1.72% under air-mass 1.5 global and illumination with the intensity of 100 mW/cm2 (AM 1.5G, 100 mW/cm2).
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Ma, Ying, Xin-tong Zhang, Zi-sheng Guan, Ya-an Cao et Jian-nian Yao. « Effects of zinc(II) and iron(III) doping of titania films on their photoreactivity to decompose rhodamine B ». Journal of Materials Research 16, no 10 (octobre 2001) : 2928–33. http://dx.doi.org/10.1557/jmr.2001.0402.

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The heterogeneous photocatalytic oxidation of rhodamine B in aqueous solution containing pure or zinc (iron)-doped titania films has been studied. N-deethylation of rhodamine B was accelerated by iron(III) and zinc(II) doping as compared with pure titania film. It is shown that improvement of electron transfer from dye molecules to the film may be responsible for the high N-deethylation rate for iron-doped (0.5 mol%) film, while for zinc-doped (20 mol%) film, high surface roughness may be the main reason. In addition, both iron and zinc doping brought a new shallow trap to the intragap meaning that the surface defects had increased after doping; this is a possible reason doped films present relative low photoreactivity to catalyze the direct degradation of dye molecules.
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Tarasov, Alexey, Anton Minnekhanov, German Trusov, Elizaveta Konstantinova, Alexandr Zyubin, Tatiana Zyubina, Alexey Sadovnikov, Yury Dobrovolsky et Eugene Goodilin. « Shedding Light on Aging of N-Doped Titania Photocatalysts ». Journal of Physical Chemistry C 119, no 32 (30 juillet 2015) : 18663–70. http://dx.doi.org/10.1021/acs.jpcc.5b02760.

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Park, Sang-Sun, Seon-Mi Eom, Masakazu Anpo, Dong-Ho Seo, Yukwon Jeon et Yong-gun Shul. « N-doped anodic titania nanotube arrays for hydrogen production ». Korean Journal of Chemical Engineering 28, no 5 (14 avril 2011) : 1196–99. http://dx.doi.org/10.1007/s11814-010-0498-7.

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Grey, I. E., P. Bordet et N. C. Wilson. « Structure of the amorphous titania precursor phase of N-doped photocatalysts ». RSC Advances 11, no 15 (2021) : 8619–27. http://dx.doi.org/10.1039/d0ra08886b.

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Amorphous titania samples prepared by ammonia solution neutralization of titanyl sulphate have been characterized by chemical and thermal analyses, and with reciprocal-space and real-space fitting of wide-angle synchrotron X-ray scattering data.
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Gao, Xiang, Peng Wan Chen, Jian Jun Liu, Hao Yin et Feng Lei Huang. « Effects of Shock Doping on the Energy Gap of TiO2 ». Materials Science Forum 673 (janvier 2011) : 149–54. http://dx.doi.org/10.4028/www.scientific.net/msf.673.149.

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In this paper, nitrogen-doped titania was achieved by detonation-driven flyer impacting on the mixtures of TiO2 and different nitrogen precursors. XRD、UV-Vis and XPS spectra were employed to characterize the phase composition, N doping concentration and energy gap of recovered samples. N doping concentration can be effectively regulated by choosing different doping nitrogen resources, changing initial content of doping nitrogen resources and flyer velocity in order to regulate the energy gap of TiO2. The maximum concentration of nitrogen of doped TiO2 by shock loading at 3.37 km/s is 13.45 at%. The results show that anatase transforms to rutile and srilankite appears at a higher flyer velocity (1.9-2.52km/s), the concentration of doped nitrogen in the recovered samples increases with increasing flyer velocity, the maximum concentration of nitrogen is 13.45 at%. The edge adsorption wavelength of nitrogen-doped titania induced by shock wave is shifted from 435nm to 730 nm and the corresponding energy gap is reduced from 2.85 eV to 1.73 eV.
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FAN, WEIQIANG, JIAQING ZHANG, GEHONG ZHANG, HONGYE BAI, WEIDONG SHI et YONGSHENG YAN. « LUMINESCENT TITANIA MACROPOROUS MATERIALS DOPED WITH Eu(DBM)3⋅H2O COMPLEX ». Functional Materials Letters 06, no 06 (27 novembre 2013) : 1350060. http://dx.doi.org/10.1142/s1793604713500604.

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Visible luminescent hybrid titania macroporous materials doped with Eu ( DBM )3⋅ H 2 O complex ( Eu ( DBM )3⋅ H 2 O / TiO 2- M , M = macroporous, DBM = dibenzoylmethanate) were synthesized with poly(methyl methacrylate) nanospheres (PMMAs) as templates. The obtained Eu ( DBM )3⋅ H 2 O / TiO 2- M exhibit close-packed spherical porous structure and characteristic red emission of the Eu 3+ ion. Moreover, diffuse reflectance (DR) and photoluminescence (PL) spectra suggest that the Eu ( DBM )3⋅ H 2 O complex were successfully doped into the macroporous titania matrix. The FT-IR, luminescent lifetimes, N 2 adsorption-desorption isotherm, and emission quantum efficiency were further investigated.
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YIN, SHU, BIN LIU et TSUGIO SATO. « MICROWAVE-ASSISTED HYDROTHERMAL SYNTHESIS OF NITROGEN-DOPED TITANIA NANOPARTICLES ». Functional Materials Letters 01, no 03 (décembre 2008) : 173–76. http://dx.doi.org/10.1142/s1793604708000319.

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Nitrogen-doped titania ( TiO 2-x N y) nanoparticles with excellent visible-light-reactive photocatalytic activity were successfully prepared by a microwave-assisted hydrothermal process. The obtained TiO 2-x N y powders showed high specific surface area, fine particle size and excellent photocatalytic ability for the oxidative destruction of nitrogen monoxide under irradiation of both visible-light (λ > 510 nm) and UV light (λ > 290 nm).
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23

Guo, Si Yao, Song Han, Dong Po He et Li Jiang. « Preparation of Nitrogen-Doped Titanium Dioxide with Visible-Light Photocatalytic Activity of Organophosphorus Pesticide Degradation ». Advanced Materials Research 183-185 (janvier 2011) : 1795–98. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.1795.

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Adjusting the nitrogen content of N doped titania which were prepared by hydrothermal method to discuss the influences of the photocatalytic properties and the modifications. It was also established that N doped TiO2 powders enhances the Vis-light absorption. Finally the photocatalytic properties of catalysts were tested in the degradation of organophosphorus pesticide. The resulting materials were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), etc.
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Wang, Hai Ying, Xiao Jun Xu, Jian Hong Wei, Rui Xiong et Jing Shi. « Structure and Raman Investigations of Nitrogen-Doped TiO2 Nanotube Arrays ». Solid State Phenomena 181-182 (novembre 2011) : 422–25. http://dx.doi.org/10.4028/www.scientific.net/ssp.181-182.422.

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The N-doped TiO2 nanotube arrays were prepared by electrochemical anodization and thermal annealing in ammonia flux. All the undoped and N-doped TiO2 nanotube arrays were pure anatase phase and the N-doped TiO2 shows obviously enhanced absorption intensity in the visible light region. The investigations on the low-frequency Eg anatase mode of Raman spectra verify that the crystallite size increases from 7.5 nm to 8.5 nm with the increase of the doped nitrogen temperature. The ratio of oxygen atoms to titanium atoms is 2.419 after titania being annealing in NH3 air stream. It could be concluded that the size effect and oxide vacancies introduced by nitrogen doping lead the great increase of UV-Vis absorption for N-doped TiO2 nanotubes.
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Tavares, C. J., S. M. Marques, S. Lanceros-Méndez, L. Rebouta, E. Alves, N. P. Barradas, F. Munnik, T. Girardeau et J. P. Rivière. « N-Doped Photocatalytic Titania Thin Films on Active Polymer Substrates ». Journal of Nanoscience and Nanotechnology 10, no 2 (1 février 2010) : 1072–77. http://dx.doi.org/10.1166/jnn.2010.1868.

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Hu, Yulong, Hongfang Liu, Weiran Chen, Debin Chen, Jiwei Yin et Xingpeng Guo. « Preparation and Visible Light Photocatalytic Activity of N-Doped Titania ». Journal of Nanoscience and Nanotechnology 10, no 3 (1 mars 2010) : 2232–37. http://dx.doi.org/10.1166/jnn.2010.2150.

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Hsu, Bao-Chrung, Shiao-Shing Chen, Chaochin Su et Yan-Chan Li. « Preparation and Characterization of Nanocrystalline Fe/N Co-Doped Titania ». Ferroelectrics 381, no 1 (30 juin 2009) : 51–58. http://dx.doi.org/10.1080/00150190902865069.

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Solís, Rafael R., F. Javier Rivas, Olga Gimeno et José Luis Pérez-Bote. « Photocatalytic ozonation of pyridine-based herbicides by N-doped titania ». Journal of Chemical Technology & ; Biotechnology 91, no 7 (27 août 2015) : 1998–2008. http://dx.doi.org/10.1002/jctb.4791.

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Balek, V., J. Ŝubrt, I. M. Bountseva, H. Irie et K. Hashimoto. « Emanation thermal analysis study of N-doped titania photoactive powders ». Journal of Thermal Analysis and Calorimetry 92, no 1 (avril 2008) : 161–67. http://dx.doi.org/10.1007/s10973-007-8755-7.

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Sai Phani Kumar, V., et Parag A. Deshpande. « On the stability of hydroxyl groups on substituted titania ». Physical Chemistry Chemical Physics 22, no 3 (2020) : 1250–57. http://dx.doi.org/10.1039/c9cp05525h.

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Mangrulkar, Priti A., Sanjay P. Kamble, Meenal M. Joshi, Jyotsna S. Meshram, Nitin K. Labhsetwar et Sadhana S. Rayalu. « Photocatalytic Degradation of Phenolics by N-Doped Mesoporous Titania under Solar Radiation ». International Journal of Photoenergy 2012 (2012) : 1–10. http://dx.doi.org/10.1155/2012/780562.

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In this study, nitrogen-doped mesoporous titania was synthesized by templating method using chitosan. This biopolymer chitosan plays the dual role of acting as a template (which imparts mesoporosity) and precursor for nitrogen. BET-SA, XRD, UV-DRS, SEM, and FTIR were used to characterize the photocatalyst. The doping of nitrogen into TiO2lattice and its state was substantiated and measured by XPS. The photocatalytic activity of the prepared N-doped mesoporous titania for phenol ando-chlorophenol degradation was investigated under solar and artificial radiation. The rate of photocatalytic degradation was observed to be higher foro-chlorophenol than that of phenol. The photodegradation ofo-chlorophenol was 98.62% and 72.2%, while in case of phenol, degradation to the tune of 69.25% and 30.58% was achieved in solar and artificial radiation. The effect of various operating parameters, namely, catalyst loading, pH, initial concentration and the effect of coexisting ions on the rate of photocatalytic degradation were studied in detail.
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32

Viswanathan, B., et K. R. Krishanmurthy. « Nitrogen Incorporation in TiO2 : Does It Make a Visible Light Photo-Active Material ? » International Journal of Photoenergy 2012 (2012) : 1–10. http://dx.doi.org/10.1155/2012/269654.

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The possibility of hydrogen production by photo-catalytic decomposition of water on titania has provided the incentive for intense research. Titania is the preferred semiconductor for this process, in spite of its large band gap (~3.2 eV) that restricts its utility only in the UV region. Various sensitization methodologies have been adopted to make titania to be active in the visible region. Doping of TiO2with nitrogen is one such method. The purpose of this presentation is to examine the state and location of nitrogen introduced in TiO2lattice and how far the shift of optical response to visible radiation can be beneficial for the observed photo-catalysis. The specific aspects that are discussed in this article are: (i) N-doped titania surface adopts a non-native configuration, though the bulk material is still in the native configuration of pure TiO2(ii) Though the nitrogen doped materials showed optical response in the visible region, the changes/improvements in photo-catalytic activity are only marginal in most of the cases. (iii) The exact chemical nature/state of the introduced nitrogen, and its location in titania lattice, substitutional and/or interstitial, is still unclear (iv) Is there a limit to the incorporation of nitrogen in the lattice of TiO2?
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33

Kulak, Anatoly, et Alexander Kokorin. « Enhanced Titania Photocatalyst on Magnesium Oxide Support Doped with Molybdenum ». Catalysts 13, no 3 (21 février 2023) : 454. http://dx.doi.org/10.3390/catal13030454.

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Titania photocatalysts supported on mesoporous MgO carriers doped with Mo(VI) ions were prepared and characterized by XRD, BET nitrogen adsorption, FT-IR, and EPR methods. The photocatalytic activity was evaluated by bleaching an aqueous dye solution in the presence of a dispersed photocatalyst and by bleaching the dry surface of a solid tablet of photocatalyst using rhodamine B and nigrosin as model organic pollutants. It was established that TiO2 photocatalyst based on MgO carrier doped with 1 wt.% Mo(VI) ions, with the ratio of MgO:TiO2 = 1:0.5, possessed the highest activity under UV radiation. The increase in the content of molybdenum up to 10 wt.% leads to the formation of a MoO3 nanophase on the MgO surface, the formation of an isotype n–n heterojunction at the MoO3/TiO2 interface, and photocatalytic activity under the action of visible light.
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Ramchiary, Anjalu, et S. K. Samdarshi. « Hydrogenation based disorder-engineered visible active N-doped mixed phase titania ». Solar Energy Materials and Solar Cells 134 (mars 2015) : 381–88. http://dx.doi.org/10.1016/j.solmat.2014.12.031.

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Joshi, Meenal M., Priti A. Mangrulkar, Saumitra N. Tijare, Priyanka S. Padole, Dilip V. Parwate, Nitin K. Labhsetwar et Sadhana S. Rayalu. « Visible light induced photoreduction of water by N-doped mesoporous titania ». International Journal of Hydrogen Energy 37, no 13 (juillet 2012) : 10457–61. http://dx.doi.org/10.1016/j.ijhydene.2012.01.113.

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36

Ihnatiuk, Daryna, Camilla Tossi, Ilkka Tittonen et Oksana Linnik. « Effect of Synthesis Conditions of Nitrogen and Platinum Co-Doped Titania Films on the Photocatalytic Performance under Simulated Solar Light ». Catalysts 10, no 9 (17 septembre 2020) : 1074. http://dx.doi.org/10.3390/catal10091074.

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Platinum and nitrogen co-doped titania films of different surface morphologies obtained via a sol-gel process have been tested for tetracycline hydrochloride photocatalytic decomposition under simulated solar light. Titania crystallization to anatase is shown by XRD for all films. A shift of the bandgap edge toward the visible region in absorption spectra and, consequently, a narrowing of the bandgap is observed for some films doped with nitrogen and/or exposed to UV pretreatment. The surface peculiarities of the samples are presented by an SEM and TEM investigation. The surface saturation by Pt and N with a homogeneous distribution of Pt ions on the surface as well as bulk as established by XPS and EDS data can be achieved with a certain synthesis procedure. The influence of the platinum content and of the pretreatment procedure on the state and atomic surface concentration of incorporated nitrogen and platinum is studied by XPS analysis: substitutional and interstitial nitrogen, non-metal containing fragments, Pt0, Pt2+ and Pt4+ ions. The photocatalytic activity of the films is ruled by the presence of Pt2+ ions and N rather than Pt0. The formation of the polycrystalline titania structure and Pt0 nanoparticles (NPs) is confirmed by TEM and electron diffraction images. The mechanism of primary photocatalytic processes is proposed.
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Tobaldi, David M., Lian Gao, Alessandro F. Gualtieri, Andrijana Sever Škapin, Antonella Tucci et Carlotta Giacobbe. « Mineralogical and Optical Characterization of SiO2-, N-, and SiO2/N-Co-Doped Titania Nanopowders ». Journal of the American Ceramic Society 95, no 5 (8 mars 2012) : 1709–16. http://dx.doi.org/10.1111/j.1551-2916.2012.05135.x.

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Rajaramanan, Tharmakularasa, Fatemeh Heidari Gourji, Dhayalan Velauthapillai, Punniamoorthy Ravirajan et Meena Senthilnanthanan. « Enhanced Photovoltaic Properties of Dye-Sensitized Solar Cells through Ammonium Hydroxide-Modified (Nitrogen-Doped) Titania Photoanodes ». International Journal of Energy Research 2023 (3 février 2023) : 1–12. http://dx.doi.org/10.1155/2023/1090174.

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Doping is a unique strategy to modulate the optical and electronic properties of semiconducting materials. This study reports a facile approach to fabricate nitrogen-doped TiO2 (N-doped TiO2) photoanode for DSSC application. A solid-state reaction was employed to synthesize a series of N-doped TiO2 nanoparticles with different volumetric ratios of nitrogen dopant and the TiO2 host. The NH4OH as a nitrogen dopant was combined with P25-TiO2 via grinding followed by calcination at 500°C. The synthesized nanoparticles were extensively characterized by XRD, XPS, EDX, SEM, and TEM techniques. XRD results suggested that the incorporation of nitrogen had not altered the structure of the TiO2 lattice, and the presence of nitrogen was confirmed through the XPS and EDX spectroscopies. SEM and TEM images, obtained before and after N doping, showed that N-doped TiO2 nanoparticles with low amounts of NH4OH (10 and 20 μL) had retained their spherical shapes and sizes while use of higher amounts of the N dopant (30 and 40 μL) had led to agglomeration of nanoparticles. BET and BJH analyses revealed that the optimized N-doped TiO2 with 20 μL of NH4OH (20N-TiO2) possesses the highest average pore diameter of 15.99 nm. Furthermore, the UV-visible spectroscopic analysis confirmed a red shift in the optical absorption edge on N doping and the corresponding bandgap reduced from 3.15 to 2.94 eV with increase in the amount of NH4OH from 0 to 40 μL. Eventually, DSSCs were fabricated using the prepared pure TiO2 and N-doped TiO2 photoanodes, N719 dye, I − / I 3 − electrolyte, and Pt counter electrode, followed by investigating their performance under simulated irradiation with 100 mW/cm2 intensity with AM 1.5 filter. The photoanode doped with 20 μL of NH4OH (20N-TiO2) exhibited the highest power conversion efficiency (PCE) of about 6.16%, which was 20% higher than that of the control device, with improved J SC . This enhancement in J SC could be predominantly attributed to higher dye uptake along with marginal contribution by reduced rate of recombination. Among the reported studies on DSSCs with N-doped P25-TiO2 photoanodes, our method gives the best efficiencies for the DSSCs.
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Kaur, Navneet, Satwant Kaur Shahi, J. S. Shahi, Sofia Sandhu, Rohit Sharma et Vasundhara Singh. « Comprehensive review and future perspectives of efficient N-doped, Fe-doped and (N,Fe)-co-doped titania as visible light active photocatalysts ». Vacuum 178 (août 2020) : 109429. http://dx.doi.org/10.1016/j.vacuum.2020.109429.

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40

Hu, Yu Long, Xiao Dong Zhang, Hong Fang Liu et Xing Peng Guo. « High-Efficiency Preparation of N-Doped Titania with High Visible Light Photocatalytic Activity Using Composite N Precursor ». Key Engineering Materials 645-646 (mai 2015) : 368–74. http://dx.doi.org/10.4028/www.scientific.net/kem.645-646.368.

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N-doped TiO2 nanoparticle powders were prepared efficiently by the sol-gel method using triethylamine and ammonium hydroxide as composite N precursor. The as-prepared N-doped TiO2 precursor powders were calcined at 300°C in air for 3 h and subsequently annealed at 300°C in air for 2.5 h. The samples were characterized by X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, thermo-gravimetric analysis, and X-ray photoelectron spectroscopy. The visible light photocatalytic activities of as-prepared samples were evaluated by photodecomposition of methyl orange (MO). The results show that the as-prepared samples have high visible light photocatalytic activities. Triethylamine produces the N-species doped in TiO2 lattice responsible for the high visible light photocatalytic activity. Ammonium hydroxide makes the gel of the TiO2 nanoparticles nitrided by triethylamine gelate further and facilitates significantly the centrifugation of the gel. An annealing treatment can eliminate effectively the outer N species caused by ammonium hydroxide and the surface organic residues, improve effectively crystallinity, and retain the N species caused by triethylamine.
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41

Xin, Gang, Ju Shen et Ya Li Meng. « Photocatalytic Degradation of Reactive Green KE-4BD in Aqueous Solutions over N-Doped Titania ». Advanced Materials Research 183-185 (janvier 2011) : 1767–71. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.1767.

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The photodegradation of reactive green KE-4BD solution is investigated using N-doped titania (N-TiO2) under visible light irradiation. N-TiO2 is prepared using ammonia or urea as a nitrogen source and characterized by X-ray diffraction, Brunauer-Emmett-Teller methods, and UV-visible diffuse reflectance spectra. The effects of the initial dye concentration and pH on photocatalytic degradation are studied, and the direct correlation between pH, dye concentration, and the rate of degradation are determined. Experimental results show that aqueous solutions of KE-4BD degrade easily in weakly acidic conditions in the presence of N-doped TiO2 (1 g/L) as a photocatalyst. The optimized dye concentration for photolysis is 150 mg/L. The complete degradation of KE-4BD could be achieved under visible light irradiation, and the dye molecules could be partly decomposed into inorganic substances.
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42

Kontos, A. G., M. Pelaez, V. Likodimos, N. Vaenas, D. D. Dionysiou et P. Falaras. « Visible light induced wetting of nanostructured N–F co-doped titania films ». Photochem. Photobiol. Sci. 10, no 3 (2011) : 350–54. http://dx.doi.org/10.1039/c0pp00159g.

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Liau, Leo Chau-Kuang, et Chu-Che Lin. « Semiconductor characterization of Cr3+-doped titania electrodes with p–n homojunction devices ». Thin Solid Films 516, no 8 (février 2008) : 1998–2002. http://dx.doi.org/10.1016/j.tsf.2007.06.025.

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Lee, Jong-Ho, Jeong-Il Youn, Young-Jig Kim et Han-Jun Oh. « Effect of Palladium Nanoparticles on Photocatalytic Characteristics of N doped Titania Catalyst ». Journal of Materials Science & ; Technology 31, no 6 (juin 2015) : 664–69. http://dx.doi.org/10.1016/j.jmst.2014.11.023.

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45

Hui-Lei, WANG, et LIU Xiao-Heng. « Synthesis of N-doped Mesoporous Titania with High Visible-light Photocatalytic Activity ». Journal of Inorganic Materials 29, no 9 (2014) : 997. http://dx.doi.org/10.15541/jim20140125.

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Katsanaki, Antigoni V., Athanassios G. Kontos, Thomas Maggos, Miguel Pelaez, Vlassis Likodimos, Evangelia A. Pavlatou, Dionysios D. Dionysiou et Polycarpos Falaras. « Photocatalytic oxidation of nitrogen oxides on N-F-doped titania thin films ». Applied Catalysis B : Environmental 140-141 (août 2013) : 619–25. http://dx.doi.org/10.1016/j.apcatb.2013.04.070.

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Mohajeri, Afshan, et Nasimeh Lari Dashti. « Molecular adsorption of hydrogen peroxide on N- and Fe-doped titania nanoclusters ». Applied Surface Science 407 (juin 2017) : 121–29. http://dx.doi.org/10.1016/j.apsusc.2017.02.162.

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48

Joshi, Meenal M., Nitin K. Labhsetwar, Priti A. Mangrulkar, Saumitra N. Tijare, Sanjay P. Kamble et Sadhana S. Rayalu. « Visible light induced photoreduction of methyl orange by N-doped mesoporous titania ». Applied Catalysis A : General 357, no 1 (mars 2009) : 26–33. http://dx.doi.org/10.1016/j.apcata.2008.12.030.

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49

Lin, Yin-Pai, Inta Isakoviča, Aleksejs Gopejenko, Anna Ivanova, Aleksandrs Začinskis, Roberts I. Eglitis, Pavel N. D’yachkov et Sergei Piskunov. « Time-Dependent Density Functional Theory Calculations of N- and S-Doped TiO2 Nanotube for Water-Splitting Applications ». Nanomaterials 11, no 11 (29 octobre 2021) : 2900. http://dx.doi.org/10.3390/nano11112900.

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On the basis of time-dependent density functional theory (TD-DFT) we performed first-principle calculations to predict optical properties and transition states of pristine, N- and S-doped, and N+S-codoped anatase TiO2 nanotubes of 1 nm-diameter. The host O atoms of the pristine TiO2 nanotube were substituted by N and S atoms to evaluate the influence of dopants on the photocatalytic properties of hollow titania nanostructures. The charge transition mechanism promoted by dopants positioned in the nanotube wall clearly demonstrates the constructive and destructive contributions to photoabsorption by means of calculated transition contribution maps. Based on the results of our calculations, we predict an increased visible-light-driven photoresponse in N- and S-doped and the N+S-codoped TiO2 nanotubes, enhancing the efficiency of hydrogen production in water-splitting applications.
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Sheng, Jianxin, Tatsuo Fukami et Junich Karasawa. « Direct current electrical degradation of iron-doped titania ceramics ». Journal of Materials Research 13, no 7 (juillet 1998) : 1761–64. http://dx.doi.org/10.1557/jmr.1998.0247.

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An anomalous increase of current was found in Fe-doped titania ceramics subjected to a constant field of 105 V/m. It is suggested that the space charge rises from blockage of O2(g) → O2−(s) ion transfer at the cathode. This leads to an increase of n-conductivity in the cathodic region and p-conductivity in the anodic region according to the specific defect equilibrium. This viewpoint was reinforced by two newly observed phenomena: (i) the I-V plot shows a linear feature at the initial stage, but it gradually becomes a rectifying feature with time; and (ii) an edge-located electrode shows lower current density and faster current saturation compared with a normal electrode.
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