Development and study of anodic Ti/TiO2 electrodes and their potential use as impedimetric immunosensors

Mantzila, Aikaterini G.; Prodromidis, Mamas I.

doi:10.1016/j.electacta.2005.10.009

Cited by 63 publications

(28 citation statements)

References 34 publications

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“…Anatase peaks were detected, in a few points along the line. These results account the presence of isolated regions with crystalline order on the as‐received titanium, in opposition to the reports of amorphous structure of native TiO 2 …”

Section: Resultsmentioning

confidence: 99%

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Surface modification of titanium by anodic oxidation in phosphoric acid at low potentials. Part 1. Structure, electronic properties and thickness of the anodic films

Sanchez

Schreiner

Duffó

et al. 2013

Surface & Interface Analysis

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Titanium surface characteristics determine the degree of success of permanent implants. The topography, morphology of the surface in micro and nano scales, the impurities present and other characteristics are a main concern, and therefore a multi‐technique approach is required in order to evaluate modification process effects on the surface. Surface modification of titanium in the nanometrical range was performed by means of anodisation in phosphoric with the aim of improving both the biocompatibility and the corrosion resistance in the biological media. Biocompatible characteristics of the modified titanium surface, as the presence of anatase in the oxide film and the incorporation of phosphate to the surface, were determined. Moreover, the electronic properties of the surface oxide presented a carrier number adequate for biomedical applications. The increase in the film thickness from 3 to 42 nm was estimated from EIS results when anodising potentials from 0 to 30 V were applied, whereas a bi‐layer structure of the protective oxides formed was determined. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

“…These results account the presence of isolated regions with crystalline order on the as-received titanium, in opposition to the reports of amorphous structure of native TiO 2 . [39,60,82] In Fig. 5, titanium anodised at 30 V micrograph and corresponding Raman spectra along a line are presented.…”

Section: Colormentioning

confidence: 99%

Surface modification of titanium by anodic oxidation in phosphoric acid at low potentials. Part 1. Structure, electronic properties and thickness of the anodic films

Sanchez

Schreiner

Duffó

et al. 2013

Surface & Interface Analysis

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“…In addition to Au, other substrate materials that have been reported for electrochemical biosensors include C [13,14], semiconducting [15,16] and degenerate [17] Si, Pt [18,19], TiÀTiO 2 [20,21], and indium tin oxide (ITO) [22,23]. These approaches have had some success, but many substrate materials are either too noble for stable covalent attachment of biomolecules, or are thermody-namically driven to form an oxide that is not electricially conductive.…”

Section: Introductionmentioning

confidence: 99%

Impedance Biosensing atop MoS₂ Thin Films with Mo−S Bond Formation to Antibody Fragments Created by Disulphide Bond Reduction

et al. 2019

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Immobilization of antibody fragments to 3‐phenoxybenzoic acid (3‐PBA), which are created by disulphide bond (S−S) reduction with tris (2‐carboxyethyl) phosphine (TCEP), is reported atop MoS2 and Cu‐doped MoS2 thin films. MoS2 and Cu‐doped MoS2 thin films are electrodeposited using previously reported methods and tested for their ability to immobilize antibody fragments, before and after annealing in Ar at 500 °C for 3 h. This annealing procedure removes excess sulphur in the as‐deposited films, and creates coordinatively unsaturated Mo sites that are highly reactive towards sulphur, as previously reported for MoS2 hydrodesulphurization catalysts. As demonstrated by electrochemical impedance spectroscopy (EIS) measurements, both annealed MoS2 and Cu‐doped MoS2 thin films adsorb antibody fragments through Mo−S bond formation, unlike the as‐deposited films. Impedance detection of 3‐PBA is reported utilizing antibody fragments bound to both materials, with a sensitivity of 2.7×108 Ω cm2 M−1 and a detection limit of 2.5×10−6 M atop MoS2, and a sensitivity of 5.9×108 Ω cm2 M−1 and a detection limit of 3.8×10−6 M atop Cu‐doped MoS2. The rms surface roughness obtained by atomic force microscopy (AFM) measurements atop annealed MoS2 and Cu‐doped MoS2 ranges from 60–140 nm, so the methods described herein are not limited to ultra‐smooth substrates.

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“…Mantzila and Prodromidis in 2005 [8] anodically formed films of titanium oxide at 0.5-65 V in 1 M H 2 SO 4 for 1 h under mild stirring. The films were characterized by electrochemical impedance spectroscopy, scanning electron microscopy, Raman spectroscopy, ellipsometry, and diffuse reflectance FT-IR spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Fiber Bragg Grating Coating with TiO₂ Nanostructured Metal Oxide for Refractive Index Sensor

Tahhan

Chen

Huang

et al. 2017

Journal of Nanotechnology

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To increase the sensitivity of biosensor a new approach using an optical fiber Bragg grating (FBG) coated with a suitable nanostructured metal oxide (NMO) is proposed which is costly effective compared to other biosensors. Bragg grating was written on a D-shaped optical fiber by phase mask method using a 248 nm KrF excimer laser for a 5 min exposure time producing a grating with a period of 528 nm. Titanium dioxide (TiO2) nanostructured metal oxide was coated over the fiber for the purpose of increasing its sensing area. The etched D-shaped FBG was then coated with 312 nm thick TiO2 nanostructured layer to ensure propagating the radiation modes within the core. The final structure was used to sense deionized water and saline. The etched D-shaped FBG original sensitivity before coating to air-deionized water and to air-saline was 0.314 nm/riu and 0.142 nm/riu, respectively. After coating the sensitivity became 1.257 nm/riu for air-deionized water and 0.857 nm/riu for air-saline.

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Development and study of anodic Ti/TiO2 electrodes and their potential use as impedimetric immunosensors

Cited by 63 publications

References 34 publications

Surface modification of titanium by anodic oxidation in phosphoric acid at low potentials. Part 1. Structure, electronic properties and thickness of the anodic films

Surface modification of titanium by anodic oxidation in phosphoric acid at low potentials. Part 1. Structure, electronic properties and thickness of the anodic films

Impedance Biosensing atop MoS₂ Thin Films with Mo−S Bond Formation to Antibody Fragments Created by Disulphide Bond Reduction

Fabrication of Fiber Bragg Grating Coating with TiO₂ Nanostructured Metal Oxide for Refractive Index Sensor

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Development and study of anodic Ti/TiO2 electrodes and their potential use as impedimetric immunosensors

Cited by 63 publications

References 34 publications

Surface modification of titanium by anodic oxidation in phosphoric acid at low potentials. Part 1. Structure, electronic properties and thickness of the anodic films

Surface modification of titanium by anodic oxidation in phosphoric acid at low potentials. Part 1. Structure, electronic properties and thickness of the anodic films

Impedance Biosensing atop MoS2 Thin Films with Mo−S Bond Formation to Antibody Fragments Created by Disulphide Bond Reduction

Fabrication of Fiber Bragg Grating Coating with TiO2 Nanostructured Metal Oxide for Refractive Index Sensor

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About

Impedance Biosensing atop MoS₂ Thin Films with Mo−S Bond Formation to Antibody Fragments Created by Disulphide Bond Reduction

Fabrication of Fiber Bragg Grating Coating with TiO₂ Nanostructured Metal Oxide for Refractive Index Sensor