Influence of geometry and annealing temperature in argon atmosphere of TiO2 nanotubes on their electrochemical properties

Nycz, Marta; Paradowska, Ewa; Arkusz, Katarzyna; Pijanowska, Dorota G.

doi:10.37190/abb-01479-2019-03

Cited by 14 publications

(13 citation statements)

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“…This structure is characterized by OCP values close to zero, one of the smallest impedance module, and a high Ipa/Ipc ratio for potassium ferricyanide, which confirms good conductivity and good adsorption properties of this structure [29]. Moreover, titanium nanotubes annealed at a temperature of 550 • C in an argon atmosphere have more anatase structures that promote biological element adsorption [32]. However, previous experiments do not attempt antibody immobilization on the TNT surface.…”

Section: Characteristics Of Titanium Dioxide Nanotubesmentioning

confidence: 70%

“…Annealing in argon could change the ingredients of the oxide layer leading to the formation of oxygen vacancies. The possible explanation is reducing titanium ions from Ti 4+ to Ti 3+ ions and the formation of oxygen vacancies [32][33][34][35]. Table 1.…”

Section: Characteristics Of Titanium Dioxide Nanotubesmentioning

confidence: 99%

“…Electrochemical biosensors have recently attracted much attention due to their simple design and high sensitivity [28]. Among all the electrode materials used for biosensing applications, titanium dioxide (TiO 2 ) represents an excellent material with good electrical properties, biocompatibility, and excellent bioactivity [29][30][31][32]. The surface topography, and electrical and adsorption properties of titanium nanotubes are important factors for the successful immobilization of biological substances [33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Impedimetric Detection of Femtomolar Levels of Interleukin 6, Interleukin 8, and Tumor Necrosis Factor Alpha Based on Thermally Modified Nanotubular Titanium Dioxide Arrays

Arkusz

Paradowska

2020

Nanomaterials

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An inexpensive, easy to prepare, and label-free electrochemical impedance spectroscopy-based biosensor has been developed for the selective detection of human interleukin 6 (IL-6), interleukin 8 (CXCL8, IL-8), and tumor necrosis factor (TNFα)—potential inflammatory cancer biomarkers. We describe a, so far, newly developed and unexplored method to immobilize antibodies onto a titanium dioxide nanotube (TNT) array by physical adsorption. Immobilization of anti-IL-6, anti-IL-8, and anti-TNFα on TNT and the detection of human IL-6, IL-8, and TNFα were examined using electrochemical impedance spectroscopy (EIS). The impedimetric immunosensor demonstrates good selectivity and high sensitivity against human biomarker analytes and can detect IL-6, IL-8, and TNFα at concentrations as low as 5 pg/mL, equivalent to the standard concentration of these proteins in human blood. The calibration curves evidenced that elaborated biosensors are sensitive to three cytokines within 5 ÷ 2500 pg/mL in the 0.01 M phosphate-buffered saline solution (pH 7.4).

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Section: Characteristics Of Titanium Dioxide Nanotubesmentioning

confidence: 70%

Section: Characteristics Of Titanium Dioxide Nanotubesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impedimetric Detection of Femtomolar Levels of Interleukin 6, Interleukin 8, and Tumor Necrosis Factor Alpha Based on Thermally Modified Nanotubular Titanium Dioxide Arrays

Arkusz

Paradowska

2020

Nanomaterials

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“…TNTs layers were thermally modified in an annealing furnace from AMP company (Zielona Gora, Poland) in an argon atmosphere at 450 °C for 2 h, with the heating and cooling rate of 6 °C·min −1 [ 7 ]. Annealing allowed the transformation of the amorphous form usually present in TNTs to the crystalline form of rutile and anatase.…”

Section: Methodsmentioning

confidence: 99%

“…The electrical conductivity and adsorption properties depend on the morphology of TNTs and their modification process. According to our previous research [ 2 , 7 ], the best electrochemical properties show the TNTs, for which the diameter was equal to 50 nm. TNTs adsorption and electrical properties are improved by thermal processing and doping with gold nanoparticles.…”

Section: Introductionmentioning

confidence: 95%

Comparison of Gold Nanoparticles Deposition Methods and Their Influence on Electrochemical and Adsorption Properties of Titanium Dioxide Nanotubes

2020

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The increasing interest of attachment of gold nanoparticles (AuNPs) on titanium dioxide nanotubes (TNTs) has been devoted to obtaining tremendous properties suitable for biosensor applications. Achieving precise control of the attachment and shape of AuNPs by methods described in the literature are far from satisfactory. This work shows the comparison of physical adsorption (PA), cyclic voltammetry (CV) and chronoamperometry (CA) methods and the parameters of these methods on TNTs properties. The structural, chemical, phase and electrochemical characterizations of TNTs, Au/TNTs, AuNPs/TNTs are carried out using scanning electron microscopy (SEM), electrochemical impedance spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy. The use of PA methods does not allow the deposition of AuNPs on TNTs. CV allows easily obtaining spherical nanoparticles, for which the diameter increases from 20.3 ± 2.9 nm to 182.3 ± 51.7 nm as a concentration of tetrachloroauric acid solution increase from 0.1 mM to 10 mM. Increasing the AuNPs deposition time in the CA method increases the amount of gold, but the AuNPs diameter does not change (35.0 ± 5 nm). Importantly, the CA method also causes the dissolution of the nanotubes layer from 1000 ± 10.0 nm to 823 ± 15.3 nm. Modification of titanium dioxide nanotubes with gold nanoparticles improved the electron transfer and increased the corrosion resistance, as well as promoted the protein adsorption. Importantly, after the deposition of bovine serum albumin, an almost 5.5-fold (324%) increase in real impedance, compared to TNTs (59%) was observed. We found that the Au nanoparticles—especially those with smaller diameter—promoted the stability of bovine serum albumin binding to the TNTs platform. It confirms that the modification of TNTs with gold nanoparticles allows the development of the best platform for biosensing applications.

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Nitrogen-doped TiO2 nanotubes obtained by anodizing for photodegradation of glycerol

Kerstner Baldin,

Marasca Antonini,

De León

et al. 2024

Bull Mater Sci

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Influence of geometry and annealing temperature in argon atmosphere of TiO2 nanotubes on their electrochemical properties

Cited by 14 publications

References 0 publications

Impedimetric Detection of Femtomolar Levels of Interleukin 6, Interleukin 8, and Tumor Necrosis Factor Alpha Based on Thermally Modified Nanotubular Titanium Dioxide Arrays

Impedimetric Detection of Femtomolar Levels of Interleukin 6, Interleukin 8, and Tumor Necrosis Factor Alpha Based on Thermally Modified Nanotubular Titanium Dioxide Arrays

Comparison of Gold Nanoparticles Deposition Methods and Their Influence on Electrochemical and Adsorption Properties of Titanium Dioxide Nanotubes

Nitrogen-doped TiO2 nanotubes obtained by anodizing for photodegradation of glycerol

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