Abstract:Titania Degussa P25 powder was treated with Argon (Ar) and Nitrogen (N 2 ) gas plasma inside of a closed homemade chamber system at 50 Pa of pressure. The electric discharge was generated applying an AC voltage (0-15,000 V) to a pair of aluminum electrodes. Two sets of samples were analyzed. In the first one, the plasma is applied directly on a layer of titania P25 that is spread out on top of one of the electrodes and, in the second one, a gold foil substrate is positioned between the titania powder and the e… Show more
“…Therefore, the result of 3.23 eV is consistent with values reported in the literatures for the anatase phase and the XRD and Raman scattering analysis support it. The result of 3.10 eV for conventional P25 TiO 2 is also comparable with previously reported values between 3.1 and 3.15 eV for this material [24,25].…”
The aim of this work was to prepare a flexible nanocomposite from ultra-fine titanium oxide (TiO 2) growth on carbon fibre via microwave-assisted hydrothermal synthesis (MHS) and to evaluate its photocatalytic properties. The TiO 2 nanoparticles were directly grown on the carbon fibre (CF). Thus, a study comparing the conventional titania coating vs. the MHS were performed. The significant layer interaction as a function of the coating method on the visible and dark dye photodegradation performance was observed. Techniques such as X-ray diffraction, electron microscopy (field-emission scanning electron microscope (FESEM)), Raman spectroscopy, among others were used aiming to characterize the different route samples. This study reports a reproducible and single method to manufacture of nanocomposites through the growth of TiO 2 nanoparticle on CF by MHS that allow controlling the thickness layer. Similar procedure of synthesized nanocomposite could be applied in different chemical compositions to advanced applications, based on the electrochemical nanostructure.
“…Therefore, the result of 3.23 eV is consistent with values reported in the literatures for the anatase phase and the XRD and Raman scattering analysis support it. The result of 3.10 eV for conventional P25 TiO 2 is also comparable with previously reported values between 3.1 and 3.15 eV for this material [24,25].…”
The aim of this work was to prepare a flexible nanocomposite from ultra-fine titanium oxide (TiO 2) growth on carbon fibre via microwave-assisted hydrothermal synthesis (MHS) and to evaluate its photocatalytic properties. The TiO 2 nanoparticles were directly grown on the carbon fibre (CF). Thus, a study comparing the conventional titania coating vs. the MHS were performed. The significant layer interaction as a function of the coating method on the visible and dark dye photodegradation performance was observed. Techniques such as X-ray diffraction, electron microscopy (field-emission scanning electron microscope (FESEM)), Raman spectroscopy, among others were used aiming to characterize the different route samples. This study reports a reproducible and single method to manufacture of nanocomposites through the growth of TiO 2 nanoparticle on CF by MHS that allow controlling the thickness layer. Similar procedure of synthesized nanocomposite could be applied in different chemical compositions to advanced applications, based on the electrochemical nanostructure.
“…As has been demonstrated in previous works, the application of nitrogen plasma facilitates the incorporation of nitrogen in the TiO 2 crystal lattice [18, 19]. In order to determine the presence of nitrogen in the crystal lattice of titanium oxide after the treatments with nitrogen plasma, an analysis of the surface chemical composition and chemical states of the plasma samples were performed using the XPS technique (Fig 6).…”
Section: Resultsmentioning
confidence: 99%
“…Both peaks are an evidence of the partial substitution of oxygen by nitrogen atoms, indicative of the N 3− species [26] in the crystalline lattice of titanium oxide which favors the chemical bond Ti-N-O. All this is a result of the constant bombing of nitrogen ions by the plasma that generates oxygen vacancies which in turn allows the incorporation of nitrogen atoms in the lattice and thus to obtain, at the end of the process, the compound N β TiO 2-X (in previous works denominated N-doped-TiO 2-X , a material which possesses new optical and photocatalytic properties [18, 19]), where β is the fraction of nitrogen substituting oxygen in the crystal lattice of titanium oxide when nitrogen atoms partially occupy the oxygen vacancies generated by sputtering effects of the plasma on the TiO 2 , where 2-X>> β .Fig. 6XPS spectra for the titanium oxide samples treated with plasma at different powers (80, 90, and 100%) and treatment times, a 60 and b 120 min
…”
Section: Resultsmentioning
confidence: 99%
“…In previous studies [18, 19], we have reported the development of a new methodology in which argon and nitrogen plasma were used to impregnate metal nanoparticles on titanium oxide using metal foil as electrode. We have also reported the phase changes that could be presented by titanium oxide P25 when applying plasma on nanostructured titanium P25 powder and the incorporation of nitrogen in the crystal lattice of the TiO 2 to obtain N-doped TiO 2-x .…”
In this work, the development of a new crystallization technique is reported, using nitrogen plasma (AC) to obtain nanostructured anatase and rutile from amorphous titanium oxide (TiO2). This methodology increases throughput and minimizes thermal effects. Nanostructured amorphous TiO2 was obtained by the sol-gel method and subsequently subjected to AC treatment, at a controlled pressure, applying different powers and treatment times in order to obtain phase changes. The obtained samples were characterized using X-ray diffraction (XRD), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS). The results show the crystallization in parallel with anatase and rutile phases with a proportion that is directly related to the applied power in the plasma and the treatment time. This technique allows us to obtain smaller crystals in comparison with those of classic thermal methodologies. It is also demonstrated that the application of plasma represents a novel and innovative method to obtain phase polymorphic changes in titanium oxide without needing to apply prolonged heat treatments at high temperatures and can therefore be taken into consideration as a technique with low energy costs, in comparison with conventional heat treatments.
“…The plasma process has been applied successfully in monometallic impregnation separately, either Au or Cu on TiO 2 to obtain TiO 2 /Au and TiO 2 /Cu, respectively. 7,8 Similarly, the process of plasma treatment has been successful in inducing phase changes on amorphous TiO 2 . 9 In this work, we reported positive results in bimetallic impregnation by applying nitrogen plasma technique, and this new proposal could contribute to improvement of novel processes in the search of new nanocomposite.…”
The main motivation of this work is to deposit two different metals (gold and silver) on titanium oxide nanoparticles surface in a one-step simple and fast physical process by applying a nitrogen plasma as the main source of nitrogen atoms to obtain nanostructured N-TiO2 − X/Au/Ag materials. The obtained nanomaterials were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, diffuse reflectance spectroscopy, scanning electron microscopy–energy dispersive X-ray spectroscopy, and high-resolution transmission electron microscopy. Based on the characterization results, we found that gold and silver nanoparticles were uniformly loaded on the titanium oxide nanocomposite surface, showing a surface plasmon absorption band due to the loading of the metal nanoparticles over titania samples. The results of this work have shown that nitrogen plasma technique is a more feasible and simple alternative to obtain the N-TiO2 − X/Au/Ag nanocomposite. Moreover, this plasma technique could be used to impregnate with other kind of metals over the surface of diverse nanomaterials.
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