Photo-electrochemistry of metallic titanium/mixed phase titanium oxide

Amouzad, Sara; Khosravi, Mehdi; Monadi, Niaz; Haghighi, Behzad; Allakhverdiev, Suleyman I.; Najafpour, Mohammad Mahdi

doi:10.1016/j.ijhydene.2021.03.106

Cited by 88 publications

(2 citation statements)

References 46 publications

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“…The Ti film exhibited diffraction peaks on the 2θ axis at 38°, 49°, 56°, 64°, 70°, and 76°, which was characteristic of the anatase phase (tetragonal crystalline system) of the TiO 2 passivating layer formed on the surface with a composition of 49.9%. It was also possible to identify peaks at 2θ at 38°, 43°, 64°, 76°, and 80°, which corresponded to titanium oxide with a low crystallinity or in an amorphous state with a dominant composition of 50.1% in the XRD pattern [ 45 , 46 ]. The Ag film exhibited five 2θ peaks at 38°, 44°, 64°, 64°, 77°, and 81° that resembled the face-centered cubic lattice (FCC) peaks found in a study by Ma et al [ 47 ].…”

Section: Analysis Of Resultsmentioning

confidence: 99%

Study of Titanium–Silver Monolayer and Multilayer Films for Protective Applications in Biomedical Devices

et al. 2021

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The search for coatings that extend the useful life of biomedical devices has been of great interest, and titanium has been of great relevance due to its innocuousness and low reactivity. This study contributes to the investigation of Ti/Ag films in different configurations (monolayer and multilayer) deposited by magnetron sputtering. The sessile droplet technique was applied to study wettability; greater film penetrability was obtained when Ag is the external layer, conferring high efficiency in cell adhesion. The morphological properties were characterized by SEM, which showed porous nuclei on the surface in the Ag coating and crystals embedded in the Ti film. The structural properties were studied by XRD, revealing the presence of TiO2 in the anatase crystalline phase in a proportion of 49.9% and the formation of a silver cubic network centered on the faces. Tafel polarization curves demonstrated improvements in the corrosion current densities of Ag/Ti/Ag/Ti/Ag/Ti/Ag/Ti and Ti/Ag compared to the Ag coating, with values of 0.1749, 0.4802, and 2.044 nA.m−2, respectively. Antimicrobial activity was evaluated against the bacteria Pseudomonas aeruginosa and Bacillus subtilis and the yeasts Candida krusei and Candida albicans, revealing that the Ti/Ag and Ag/Ti/Ag/Ti/Ag/Ti/Ag/Ti coatings exhibit promise in biomedical material applications.

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Section: Analysis Of Resultsmentioning

confidence: 99%

Study of Titanium–Silver Monolayer and Multilayer Films for Protective Applications in Biomedical Devices

et al. 2021

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“…Pioneering work on anatase titanium dioxide (TiO 2 ) semiconductors has provided a new avenue for addressing these challenges by employing photocatalysis [ 16 , 17 , 18 ]. However, TiO 2 only absorbs ultraviolet (UV) light with a utilisation rate of only 2%; thus, new methods need to be developed to improve visible-light absorption rates [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of Magnetic Z-Scheme g-C3N4/CoFe2O4 Nanofibres with Controllable Morphology on Photocatalytic Activity

Chen

Yang

et al. 2023

Nanomaterials

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The rational design of interfacial contacts plays a decisive role in improving interfacial carrier transfer and separation in heterojunction photocatalysts. In Z-scheme photocatalysts, the recombination of photogenerated electron–hole pairs is prevented so that the redox capacity is maintained. Here, one-dimensional graphitic carbon nitride (g-C3N4)/CoFe2O4 fibres were synthesised as a new type of magnetic Z-scheme visible-light photocatalyst. Compared with pure g-C3N4 and CoFe2O4, the prepared composite photocatalysts showed considerably improved performance for the photooxidative degradation of tetracycline and methylene blue. In particular, the photodegradation efficiency of the g-C3N4/CoFe2O4 fibres for methylene blue was approximately two and seven times those of g-C3N4 and CoFe2O4, respectively. The formation mechanism of the Z-scheme heterojunctions in the g-C3N4/CoFe2O4 fibres was investigated using photocurrent spectroscopy and electrochemical impedance spectroscopy. We proposed that one of the reasons for the improved photodegradation performance is that the charge transport path in one-dimensional materials enables efficient photoelectron and hole transfer. Furthermore, the internal electric field of the prepared Z-scheme photocatalyst enhanced visible-light absorption, which provided a barrier for photoelectron–hole pair recombination.

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