- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Tuning the Crystalline Structure and Properties of TiO <i> <sub/>x</sub></i> Thin Films Deposited by DC Reactive Magnetron Sputtering by Adjusting the Ar/O <sub/>2</sub> Ratio
摘要： In this study, TiOx thin films were deposited by DC reactive magnetron sputtering (DC-RMS), using different Ar/O2 ratios in the absence of substrate bias and substrate heating. We observe a gradual change in the crystal structure and stoichiometry of the films with increasing Ar/O2 ratio, enabling to obtain TiOx films either with a pure anatase phase, a mixture between anatase and rutile, or a pure rutile phase. Our experimental results demonstrate that, by fine tuning the Ar/O2 ratio during DC-RMS deposition process, a TiOx thin film with tunable crystal structure and properties (surface morphology, atomic density, index of refraction, and film hardness) can be obtained in a simple way.
关键词： Sputtering,Physical Vapor Deposition,Thin Film,TiO2,Crystal Structure
更新于2025-09-04 15:30:14
-
Facile Preparation and Photocatalytic Properties of TiO <sub/>2</sub> Fiber Membrane with Wrinkle Structure
摘要： Herein, TiO2 fiber membrane with wrinkle structure was fabricated by an electrospinning technique in combination with a sol–gel process. The as-prepared TiO2 membranes were interwoven with interconnected nanofibers. The surfacial and morphological features of the obtained TiO2 fiber membrane could be tuned by varying the content of the precursor, titanium (IV) n-butoxide. The nature of wrinkle structure and high surface area demonstrates an impact on the electron–hole separation and charge transfer during photocatalytic tests, thereby leading to an obvious enhancement in the photocatalytic performance. The results revealed the resultant TPNs-20 sample displayed the best photocatalytic performance toward the removal of methyl orange (MO), and its degradation degree was up to 97% within 70 min. Furthermore, a photocatalytic mechanism is proposed on the basis of results and analysis, which indicates that ?OH and ?O?2 radicals are the main reactive species responsbile for the enhanced photocatalytic activity. We anticipate that controllable synthesis of promising TiO2 fiber membranes in this study provides new insight into the development of efficient photocatalysts for high-performance environmental remediation.
关键词： Photocatalytic Activity,Wrinkle Structure,TiO2 Fiber Membrane,Electrospinning
更新于2025-09-04 15:30:14
-
Effect of Physical Properties upon Hydrothermal Treatments on Titanium Dioxide Films
摘要： Titanium dioxide is used extensively as semiconductor since more than five decades. Hydrothermal method is one the method which widely used for the synthesis of TiO2 have been widely developed. The effect of hydrothermal temperatures on the titanium dioxide films is investigated. The TiO2 films were prepared by hydrothermally layering a mixture of aquadest, HCl and titanium(IV) isopropoxide over indium tin oxide glass, at 110, 150, 180 and 200 oC for 10 h. The film on the surface of indium tin oxide glass was calcined at 500 oC and characterized by X-ray diffraction, UV-visible spectroscopy and scanning electron microscopy-energy dispersive X-ray (SEM-EDX) methods. The study shows that the TiO2 has a spherical morphology with the size between 0.5 to 2 μm. The TiO2 consits of rutile and anatase with the particle size ranging from 16.97 to 24.10 nm and from 18.09 to 26.75 nm, respectively. The band gap energy of TiO2 is between 3.17 to 3.48 eV.
关键词： Anatase,Hydrothermal,TiO2,Solar cell
更新于2025-09-04 15:30:14
-
Microcystis aeruginosa Synergistically Facilitate the Photocatalytic Degradation of Tetracycline Hydrochloride and Cr(VI) on PAN/TiO2/Ag Nanofiber Mats
摘要： Cyanobacterial blooms can cause serious damage to aquatic ecosystems. However, we have demonstrated that typical algae-blooming species Microcystis aeruginosa (M. aeruginosa) combined with photocatalysts could synergistically facilitate the photodecontamination of tetracycline hydrochloride (TC) and Cr(VI). In this study, for the first time, harmful algae were successfully converted into photoreactive bionano hybrid materials by immobilizing M. aeruginosa cells onto polyacrylonitrile (PAN)-TiO2/Ag hybrid nanofibers, and their photocatalytic activity was evaluated. The addition of M. aeruginosa significantly improved the photodecontamination, and the reaction rate constant (k) values of TC and Cr(VI) degradation by M. aeruginosa-PAN/TiO2/Ag nanofiber mats were 2.4 and 1.5-fold higher than that of bare PAN/TiO2/Ag nanofiber. Photoreaction caused damage to algae cells, but no microcystin was found that had been photodegraded simultaneously. The effects of various active species were also investigated, and the photodegradation mechanism was proposed. Recycling tests revealed that this flexible M. aeruginosa-PAN/TiO2/Ag hybrid mat had potential application in the removal of mixed organic and inorganic pollutants with high efficiency and without secondary pollutants. Thus, harmful algae blooms could serve as an efficient materials to remove toxic pollutants in a sustainable way under visible light irradiation.
关键词： Ag nanoparticles,PAN nanofiber,Cr(VI),tetracycline,TiO2 photocatalytic,Microcystis aeruginosa
更新于2025-09-04 15:30:14
-
Microstructure and Electrochemical Behavior of TiO <sub/>2</sub> Nanotubes Coated on Titanium-Based Substrate Before and After Thermal Treatment
摘要： The comparative study of the structure and electrochemical properties of TiO2 layers on the surfaces of commercially pure titanium and Ti6Al4V alloy were performed. The TiO2 surface layers produced by anodization in ethylene glycol-based electrolyte solution using Power Supply MCS-3204 MANSON at 20 V or 40 V for 60 minutes were formed on the titanium substrates by simultaneous surface oxidation and controlled dissolving of oxide film due the fluorine ions. The SEM and X-ray diffraction analyses were performed to determine the properties of the anodized layers before and after heat treatment at 500 °C for 120 minutes. The as-anodized TiO2 nanotubes exhibited an amorphous structure. An anatase phase appeared in annealed nanotube layers of both Ti based substrates. The corrosion behavior in simulated physiological solution was compared for not anodized, anodized and anodized heat treated conditions of both titanium surfaces. The results of the electrochemical measurements corresponded to the microstructure and treatment condition. The porous feature of the anodizing layers on Ti6Al4V substrate led to lower corrosion resistance that increased after the heat treatment.
关键词： TiO2 Nanotubes,XRD,Titanium Alloy,Anodization,Microstructure
更新于2025-09-04 15:30:14
-
Preparation and Characterization of Zeolite/TiO2 Cement-Based Composites with Excellent Photocatalytic Performance
摘要： A zeolite/TiO2 composite (ZTC) was applied to prepare a high-quality photocatalytic cement-based material (PCM). The acetone degradation experiment and micro measurements including XRD(X-Ray Diffractometer), SEM-EDS(Scanning Electron Microscope-Energy Dispersive Spectrometer), BET(BET Speci?c Surface Area Tester), FTIR(Fourier Transform Infrared Spectrometer) were conducted to characterize the photocatalytic ef?ciency and physicochemical properties of PCM, respectively. Results show that TiO2 particles disperse on the surface of a PCM homogeneously and provide abundant active sites for photocatalytic reactions. Compared to a normal photocatalytic cement-based material (NPCM), the TiO2 content of a PCM is lower and its photocatalytic ef?ciency is higher. The ZTC frees TiO2 particles from the impacts of cement hydration products and increases the adsorption volume of acetone. The photocatalytic performance of the PCM was stable after repeated tests. Using the ZTC as a photocatalyst has a prominent effect on the photocatalytic performance of the PCM.
关键词： photocatalytic cement-based material,photocatalytic ef?ciency,Zeolite/TiO2 composite
更新于2025-09-04 15:30:14
-
Preparation of Nano Spinel Doped TiO <sub/>2</sub> and Its Photocatalytic Activity Evaluation Under Visible Light Irradiation
摘要： Nano MgFe–TiO2 photocatalyst was prepared by mixing nanoscale spinel compounds such as magnesium ferrite (MgFe) and TiO2. The cations produced by MgFe are affected by various influencing factors such as calcination temperature, precursor, and mass ratio of Mg and Fe. This study is to evaluate the photocatalytic efficiency of nano MgFe-doped TiO2 under visible light according to the composition ratio of Mg, Fe and TiO2. With an increase the percentage of doping (i.e., Mg and Fe) over TiO2, the band gap between conduction band and valance band decreases, therefore showing better photocatalytic activity in visible light. Also as percentage of doping over TiO2 increases, surface area of the catalyst also increases subsequently resulting in an increase in the adsorption capacity.
关键词： Visible Light,Spinel Compound,Magnesium Ferrite,Photocatalysis,TiO2
更新于2025-09-04 15:30:14
-
Porous TiO <sub/>2</sub> Nanotube Arrays for Drug Loading and Their Elution Sensing
摘要： Porous TiO2 nanotube arrays have been attracting much attention as optical sensing layers and surface layers of dental implants because they are stable in acid and biocompatible. To use them as the optical sensing layers, TiO2 nanotube arrays with various structures were fabricated and obtained an optimized microstructure at 50 V, 50 min and 0.5 wt% of NH4F, 7.4 vol% deionized water in ethylene glycol. TiO2 nanotube arrays which had diameters of ～73.54 nm and lengths of ～3.39 μm showed the best sensing performance. A Ti implant was also anodized at 60 V for 4 hr in an ethylene glycol electrolyte and TiO2 nanotube arrays showed the pore diameter of 156.01 nm and the thickness of 6.87 μm. Recombinant human bone morphogenetic protein-2 (rhBMP-2), isobutylphenyl propionic acid, and sodium alendronate were loaded into the TiO2 nanotube arrays on the surface of the Ti implant. For elution of these drugs, optical thickness changes of 2.4 nm, 3.5 nm and 3.1 nm were respectively observed for about 2.2 hr, 3.6 hr and 3.1 hr. The TiO2 nanotube arrays were useful for drug loading and their elution interferometric sensing.
关键词： Dental Implant,Porous TiO2 Nanotube Arrays,Interferometric Sensor,Isobutylphenyl Propionic Acid,Drug Delivery,rhBMP-2,Sodium Alendronate
更新于2025-09-04 15:30:14
-
Preparation and Photocatalytic Activities of Black TiO <sub/>2</sub> in Vacuum and Ambient Temperature Environment
摘要： The preparation conditions are important for the structure and properties of black TiO2. In this paper, the black rutile TiO2 with a particle size of approximately 5 nm was prepared in vacuum by the infrared nano-second laser sputtering deposition method. The study results indicated that the prepared black TiO2 exhibited high light absorption from UV to near-infrared region. The lattice distortion and Ti3+ were responsible for the upward shift in the valance band, and the oxygen vacancy states were determined to be located about 0.7–1.18 eV under the conduction band, narrowing the band gap of TiO2 from 3.2 eV to 2.1 eV. Although the black TiO2 exhibited strong adsorption effects within the full spectrum and had a higher free carrier density, the presence of excess oxygen defects resulted in a higher recombination rate of the photo electron–hole pairs, which induced a poor photocatalytic performance of the black TiO2. This work facilitates the understanding of the mechanisms mechanism of black TiO2 formation via laser ablation, and emphasized the need for the controllability and quanti?cation of oxygen vacancies.
关键词： Vacuum,Laser Ablation,Oxygen Vacancy,Photocatalytic Activity,Black TiO2
更新于2025-09-04 15:30:14
-
A Facile Method for Preparation of Cu2O-TiO2 NTA Heterojunction with Visible-Photocatalytic Activity
摘要： Based on highly ordered TiO2 nanotube arrays (NTAs), we successfully fabricated the Cu2O-TiO2 NTA heterojunction by a simple thermal decomposition process for the first time. The anodic TiO2 NTAs were functioned as both “nano-container” and “nano-reactors” to load and synthesize the narrow band Cu2O nanoparticles. The loaded Cu2O expanded absorption spectrum of the TiO2 NTAs from ultraviolent range to visible light range. We found that the Cu2O-TiO2 NTA heterojunction films had visible activity towards photocatalytic degrading methyl orange (MO). The photocatalytic abilities of the Cu2O-TiO2 NTA heterojunction films were found increased with the Cu2O content from 0.05 to 0.3 mol/L. This could be explained by more electron-hole pairs generated and less recombination, when the Cu2O-TiO2 heterojunction got formed. Here, we put forward this promising method, hoping it can facilitate the mass production and applications of Cu2O-TiO2 NTA heterojunction.
关键词： TiO2 nanotube,Visible photocatalysis,Thermal decomposition,Cu2O,Heterojunction
更新于2025-09-04 15:30:14