TiO2(Fe3+) nanostructured thin films with antibacterial properties

Trapalis, C.; Keivanidis, Panagiotis E.; Κορδάς, Γ.; Zaharescu, Maria; Crışan, Maria; Szatvanyi, Alexandra; Gärtner, M.

doi:10.1016/s0040-6090(03)00331-6

Cited by 208 publications

(108 citation statements)

References 16 publications

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“…(For interpretation of the references to colour in this figure legend, the reader is referred to the web version of the article.) order to improve the photocatalytic efficiency of TiO 2 , reducing recombination of photo-generated electrons and holes, it has been observed that some certain metal ions doping can enhance photocatalytic activity of TiO 2 [14][15][16]. It has been shown that different percentages of Fe 3+ ions doped TiO 2 showed improvement over TiO 2 by extending the wavelength of TiO 2 from UV to the visible region.…”

Section: Resultsmentioning

confidence: 99%

“…It has been shown that the photocatalytic activity of TiO 2 is influenced by the crystal structure (anatase and rutile), surface area, size distribution, porosity, surface hydroxyl group density, etc. These properties have an influence on the production of electron-hole pairs on the surface adsorption and desorption processes as well as the redox process [4] [4]. Of these metal ions, ferric ion (Fe 3+ ) with UV radiation on the decomposition of organic compounds has an important effect.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of Fe2O3–TiO2 thin films on glass substrate for photocatalytic applications

Çelik

Yıldız

Azem

et al. 2006

Materials Science and Engineering: B

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Fe 2 O 3 -TiO 2 coatings were successfully prepared on glass slide substrates using sol-gel method for photocatalytic applications. The phase structure, thermal, microstructure and surface properties of the coatings were extensively characterized by using X-ray diffractometry (XRD), differential thermal analysis/thermograviometry (DTA/TG), scanning electron microscopy (SEM) and atomic force microscopy (AFM). Their adhesion and absorbance properties were investigated by a scratch tester and UV-vis spectroscopy. Four different solutions were prepared by changing Fe/Ti molar ratios. Glass substrates were coated by solutions of Ti-alkoxide, Fe-chloride, glaciel acetic acid and isopropanol. The obtained gel films were dried at 300 • C for 10 min and subsequently heat-treated at 500 • C for 5 min in air. The oxide thin films were annealed at 600 • C for 60 min in air. The influence of Fe 3+ concentration and number of layers on structure of the films was established. In addition, XRD results revealed that Fe 2 O 3 -TiO 2 films composed of TiO 2 , Fe 2 Ti 3 O 9 , Ti 3 O 5 and Fe 3 O 4 phases. According to DTA/TG result, it was determined that endothermic and exothermic reactions were formed at temperatures between 80 and 650 • C due to solvent removal, combustion of carbon based materials and oxidation of Fe and Ti. SEM observations exhibited that the coating structure becomes more homogeneous depending on an increase of Fe/Ti molar ratios and thus a regular surface morphology forms with increasing Fe/Ti ratio. It was also seen that as the Fe/Ti ratio increases the surface roughness of the films increases. Critical adhesion force of thin films with Fe/Ti ratio of 0, 0.07, 0.18 and 0.73 were found to be 9, 25, 28 and 21 mN, respectively. The methylene blue solutions photocatalyzed by TiO 2 based thin films shows characteristic absorption bands at 420 nm.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of Fe2O3–TiO2 thin films on glass substrate for photocatalytic applications

Çelik

Yıldız

Azem

et al. 2006

Materials Science and Engineering: B

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“…In addition, these oxides have been applied in chemical sensors developed for monitoring the composition of gaseous [9][10][11] or liquid [12] environments. Furthermore, TiO 2 can be used as a (photo-) catalyst for removing pollutants from water [13][14][15][16], for producing hydrogen from water [17], and in solar cells [18]. The last applications mentioned here are directly related to environmental technologies.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that electronic properties and catalytic activity of a material depend on its crystal structure [9,[13][14][15]17]. For many oxides, the control of the phase composition is not a trivial task, however.…”

Section: Introductionmentioning

confidence: 99%

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Structural study of TiO2 thin films by micro-Raman spectroscopy

et al. 2006

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Abstract:The Raman spectroscopy method was used for structural characterization of TiO 2 thin films prepared by atomic layer deposition (ALD) and pulsed laser deposition (PLD) on fused silica and single-crystal silicon and sapphire substrates. Using ALD, anatase thin films were grown on silica and silicon substrates at temperatures 125-425 • C. At higher deposition temperatures, mixed anatase and rutile phases grew on these substrates. Post-growth annealing resulted in anatase-to-rutile phase transitions at 750 • C in the case of pure anatase films. The films that contained chlorine residues and were amorphous in their as-grown stage transformed into anatase phase at 400 • C and retained this phase even after annealing at 900 • C. On single crystal sapphire substrates, phase-pure rutile films were obtained by ALD at 425 • C and higher temperatures without additional annealing. Thin films that predominantly contained brookite phase were grown by PLD on silica substrates using rutile as a starting material.

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Carbyne‐Containing Surface Coatings

Demyashev

Taube

2006

Wiley Encyclopedia of Biomedical Engineering

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Synthesis of carbyne‐containing surface coatings for a variety of biomedical applications is a matter of a great importance. Carbynes with a one‐dimensional chain‐like molecular structure that were discovered a few decades ago represent a basic allotropic form of carbon equally with diamond and graphite. Carbynes appear as quasi‐crystalline structures of carbon‐chains with double (CC) n and alternating single/triple (–CC–) n covalent bonds. The aim of this article is to summarize existing information about carbyne‐containing surface coatings for biomedical applications and to outline novel approaches for synthesis of such functional biomaterials in the form of coatings. The first research and development of carbyne‐containing materials demonstrated their great potential for biomedical applications. Carbynes possess a high biocompatibility, low litho‐ and thrombogenic activity, high resistance to chemically aggressive biological liquids, antibacterial and antifungal activities, and so on. Equally with the state‐of‐the‐art biomaterials in question, three novel carbyne‐containing surface coatings are here highlighted: (1) carbynes‐W 3 C composite coatings chemically vapor‐deposited, (2) carbyne‐containing layers formed by electropolishing of the surface of transition metal carbides, and (3) microwave‐induced defluorination of polytetrafluoroethylene (PTFE or Teflon) on the interface of “PTFE‐Water” at ∼95°C. This article demonstrates opportunities to synthesize the carbyne‐containing surface coatings that can be practically realized for biomedical applications. The three coating processes afford the opportunity to modify the surfaces of the basic artificial implants; i.e., metallic/ceramic artificial implants can be coated by the Carbynes‐W 3 C composite; artificial implants manufactured from transition metal alloys can be electrochemically modified by carbyne‐containing coating; and PTFE‐implants can be modified by microwave‐induced surface defluorination leading to the formation of a carbyne‐containing surface layer.

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TiO2(Fe3+) nanostructured thin films with antibacterial properties

Cited by 208 publications

References 16 publications

Preparation and characterization of Fe2O3–TiO2 thin films on glass substrate for photocatalytic applications

Preparation and characterization of Fe2O3–TiO2 thin films on glass substrate for photocatalytic applications

Structural study of TiO2 thin films by micro-Raman spectroscopy

Carbyne‐Containing Surface Coatings

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