Influence of Anodic and Thermal Barrier Layers on Physicochemical Behavior of Anodic TiO2 Nanotubes

Francesco Di Quarto, Monica Santamaria, Miraghaei, Ashrafizadeh, Shimizu

Risultato della ricerca: Article

7 Citazioni (Scopus)

Abstract

Electrochemical and photo-electrochemical behavior of self-organized TiO2 nanotubes formed in organic solvents have been studiedby taking into account the formation of new barrier layers beneath nanotubes either due to the anodic polarization in aqueoussolutions or air exposure during high temperature annealing. It has been shown that before annealing, electrochemical and photoelectrochemicalanswers are dominantly controlled by the physicochemical properties of the anodic barrier layer. Annealing in air atsufficiently high temperatures changes the initial amorphous structure of as-prepared nanotubes and forms a new oxide layer belowthem due to thermal oxidation of underneath titanium. Affixing tube bottoms to the substrate during annealing, which forms a betterelectrical contact, can play an important role in collecting a higher photoresponse from annealed nanotubes. In order to improve TiO2nanotubes performance the role of the new anodic or thermal layers, bridging nanotubes and metal substrate, has to be considered.
Lingua originaleEnglish
Numero di pagine8
RivistaJournal of the Electrochemical Society
Volume158 (11) K197-K204 (2011)
Stato di pubblicazionePublished - 2011

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Nanotubes
Annealing
Anodic polarization
Substrates
Air
Titanium
Organic solvents
Oxides
Metals
Hot Temperature
Oxidation
Temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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title = "Influence of Anodic and Thermal Barrier Layers on Physicochemical Behavior of Anodic TiO2 Nanotubes",
abstract = "Electrochemical and photo-electrochemical behavior of self-organized TiO2 nanotubes formed in organic solvents have been studiedby taking into account the formation of new barrier layers beneath nanotubes either due to the anodic polarization in aqueoussolutions or air exposure during high temperature annealing. It has been shown that before annealing, electrochemical and photoelectrochemicalanswers are dominantly controlled by the physicochemical properties of the anodic barrier layer. Annealing in air atsufficiently high temperatures changes the initial amorphous structure of as-prepared nanotubes and forms a new oxide layer belowthem due to thermal oxidation of underneath titanium. Affixing tube bottoms to the substrate during annealing, which forms a betterelectrical contact, can play an important role in collecting a higher photoresponse from annealed nanotubes. In order to improve TiO2nanotubes performance the role of the new anodic or thermal layers, bridging nanotubes and metal substrate, has to be considered.",
keywords = "Electrochemical Impedance Measurements, Photoelectrochemistry, SEM., TiO2 nanotubes, anodizing",
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TY - JOUR

T1 - Influence of Anodic and Thermal Barrier Layers on Physicochemical Behavior of Anodic TiO2 Nanotubes

AU - Di Quarto, Francesco

AU - Santamaria, Monica

AU - Miraghaei, null

AU - Ashrafizadeh, null

AU - Shimizu, null

PY - 2011

Y1 - 2011

N2 - Electrochemical and photo-electrochemical behavior of self-organized TiO2 nanotubes formed in organic solvents have been studiedby taking into account the formation of new barrier layers beneath nanotubes either due to the anodic polarization in aqueoussolutions or air exposure during high temperature annealing. It has been shown that before annealing, electrochemical and photoelectrochemicalanswers are dominantly controlled by the physicochemical properties of the anodic barrier layer. Annealing in air atsufficiently high temperatures changes the initial amorphous structure of as-prepared nanotubes and forms a new oxide layer belowthem due to thermal oxidation of underneath titanium. Affixing tube bottoms to the substrate during annealing, which forms a betterelectrical contact, can play an important role in collecting a higher photoresponse from annealed nanotubes. In order to improve TiO2nanotubes performance the role of the new anodic or thermal layers, bridging nanotubes and metal substrate, has to be considered.

AB - Electrochemical and photo-electrochemical behavior of self-organized TiO2 nanotubes formed in organic solvents have been studiedby taking into account the formation of new barrier layers beneath nanotubes either due to the anodic polarization in aqueoussolutions or air exposure during high temperature annealing. It has been shown that before annealing, electrochemical and photoelectrochemicalanswers are dominantly controlled by the physicochemical properties of the anodic barrier layer. Annealing in air atsufficiently high temperatures changes the initial amorphous structure of as-prepared nanotubes and forms a new oxide layer belowthem due to thermal oxidation of underneath titanium. Affixing tube bottoms to the substrate during annealing, which forms a betterelectrical contact, can play an important role in collecting a higher photoresponse from annealed nanotubes. In order to improve TiO2nanotubes performance the role of the new anodic or thermal layers, bridging nanotubes and metal substrate, has to be considered.

KW - Electrochemical Impedance Measurements

KW - Photoelectrochemistry

KW - SEM.

KW - TiO2 nanotubes

KW - anodizing

UR - http://hdl.handle.net/10447/73302

M3 - Article

VL - 158 (11) K197-K204 (2011)

JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

SN - 0013-4651

ER -