A Mathematical Model for the Influence of Deep‐Level Electronic States on Photoelectrochemical Impedance Spectroscopy: I . Theoretical Development

Bonham, D. Bivings; Orazem, Mark E.

doi:10.1149/1.2069155

Cited by 19 publications

(13 citation statements)

References 14 publications

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“…For samples AT-II and AT-I the Mott-Schottky plots are non-linear in the entire potential region. This behavior is commonly observed for amorphous films and when the potential drop applied is divided between the space charge region and an insulating outer film [45][46][47]. The surface film on sample AT-II and AT-I is indeed invisible in X-ray diffraction, see Section 3.1.2, while the thin film on reference A shows some crystallinity.…”

Section: Impedance Spectroscopy and Mott-schottky Analysismentioning

confidence: 67%

Surface characterization, electrochemical properties and in vitro testing of hierarchically structured titanium surfaces

Mattisson

Gretzer

Ahlberg

2013

Materials Research Bulletin

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Section: Impedance Spectroscopy and Mott-schottky Analysismentioning

confidence: 67%

Surface characterization, electrochemical properties and in vitro testing of hierarchically structured titanium surfaces

Mattisson

Gretzer

Ahlberg

2013

Materials Research Bulletin

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“…When a capacitance measurement method is used, some nonlinearity (smooth bending) has been observed in the Mott-Schottky plot of a thin passive oxide film. 45,46 It has been suggested that the nonlinearity is due to amorphous or highly disordered and nonstoichiometric structure of passive films. 47 However, the deviation seen in this investigation does not appear to be the same as the commonly observed nonlinearity for a thin oxide film, and the origin for this deviation is not clear.…”

Section: Tio 2 Film On Stainless Steelmentioning

confidence: 99%

Corrosion resistance for biomaterial applications of TiO2 films deposited on titanium and stainless steel by ion-beam-assisted sputtering

Pan

Leygraf

Thierry³

et al. 1997

J. Biomed. Mater. Res.

147

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The high corrosion resistance and good biocompatibility of titanium and its alloys are due to a thin passive film that consists essentially of titanium dioxide. There is increasing evidence, however, that under certain conditions extensive titanium release may occur in vivo. An ion-beam-assisted sputtering deposition technique has been used to deposit thick and dense TiO2 films on titanium and stainless steel surfaces. In this study, using the following measurements these TiO2 films have been investigated in a phosphate-buffered saline solution: (1) open-circuit potential versus time of exposure, (2) electrochemical impedance spectroscopy, (3) potentiodynamic polarization, and (4) Mott-Schottky plot. A higher electrical film resistance, lower passive current density, and lower donor density (in the order of 10(15) cm-3) have been measured for the sputter-deposited oxide film on titanium in contrast to the naturally formed passive oxide film on titanium (donor density in the order of 10(20) cm-3). The improved corrosion protection of the sputter-deposited oxide film can be explained by a low defect concentration and, consequently, by a slow mass transport process across the film. As opposed to TiO2 on titanium, a deviation from normal n-type semiconducting Mott-Schottky behavior was observed for TiO2 on stainless steel.

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“…The potential drop over the oxide can be divided into two parts: one takes place over the less conducting outer part of the oxide and the other over the more conducting part closer to the metal/oxide interface [37–39]. Close to the flat band potential, most of the potential drop takes place over the insulating part, and it is possible to calculate the part of the potential, that is, used to establish the space charge region in the semiconducting part of the oxide [38].…”

Section: Resultsmentioning

confidence: 99%

Electronic Properties ofTiO2Nanoparticles Films and the Effect on Apatite-Forming Ability

Löberg

Holmberg

Mattisson

et al. 2013

International Journal of Dentistry

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Nanoparticle-covered electrodes have altered properties as compared to conventional electrodes with same chemical composition. The changes originate from the large surface area and enhanced conduction. To test the mineralization capacity of such materials, TiO2 nanoparticles were deposited on titanium and gold substrates. The electrochemical properties were investigated using cyclic voltammetry and impedance spectroscopy while the mineralization was tested by immersion in simulated body fluid. Two types of nucleation and growth behaviours were observed. For smooth nanoparticle surfaces, the initial nucleation is fast with the formation of few small nuclei of hydroxyapatite. With time, an amorphous 2D film develops with a Ca/P ratio close to 1.5. For the rougher surfaces, the nucleation is delayed but once it starts, thick layers are formed. Also the electronic properties of the oxides were shown to be important. Both density of states (DOS) in the bandgap of TiO2 and the active area were determined. The maximum in DOS was found to correlate with the donor density (N d) and the active surface area. The results clearly show that a rough surface with high conductivity is beneficial for formation of thick apatite layers, while the nanoparticle covered electrodes show early nucleation but limited apatite formation.

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A Mathematical Model for the Influence of Deep‐Level Electronic States on Photoelectrochemical Impedance Spectroscopy: I . Theoretical Development

Cited by 19 publications

References 14 publications

Surface characterization, electrochemical properties and in vitro testing of hierarchically structured titanium surfaces

Surface characterization, electrochemical properties and in vitro testing of hierarchically structured titanium surfaces

Corrosion resistance for biomaterial applications of TiO2 films deposited on titanium and stainless steel by ion-beam-assisted sputtering

Electronic Properties ofTiO2Nanoparticles Films and the Effect on Apatite-Forming Ability

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