Smart (Nano) materials: TiO2 nanostructured films to modify electrodes for assembling of new electrochemical probes

Curulli, Antonella; Valentini, Federica; Padeletti, G.; Viticoli, M.; Caschera, Daniela; Palleschi, Giuseppe

doi:10.1016/j.snb.2005.03.044

Cited by 51 publications

(30 citation statements)

References 24 publications

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“…The growth technology and the characterization results of Au nanotubes have been reported elsewhere. 14,15 The self-assembling monolayer of the thiols was attached to Au nanotubes by using 3-mercaptopropionic acid. For cross-linking with the enzyme, the samples, modified with thiols, were soaked for 2 h in a solution of glutaraldehyde in phosphate buffer (pH D 7) at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Immobilization of GOD and HRP enzymes on nanostructured substrates

Curulli

Cusmà

Kačiulis

et al. 2006

Surface & Interface Analysis

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The study of the entrapment of glucose oxidase (GOD) and horseradish peroxidase (HRP) enzymes on different solid-state substrates has been carried out. By using conventional methods, these enzymes have been immobilized on the following substrates: commercial Si wafers, thin films of nanostructured TiO 2 and gold nanotubes grown on polycarbonate membranes. Surface chemical composition and morphology of the samples have been investigated by means of X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). Peak-fitting analysis of the main XPS signals permitted identification of the fingerprints of GOD and HRP enzymes and comparison of their entrapment on different substrates. The highest amount of attached enzymes was registered on the nanostructured TiO 2 films prepared by using the sol-gel technique. Moreover, the surface impurities, remaining on the samples after the immobilization of the phosphate buffer solution, were identified, and their removability by sample washing in deionized water was demonstrated.

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Section: Methodsmentioning

confidence: 99%

Immobilization of GOD and HRP enzymes on nanostructured substrates

Curulli

Cusmà

Kačiulis

et al. 2006

Surface & Interface Analysis

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“…This was explained based on the much larger surface area and consequently higher density of active redox sites. Those characteristics should improve the electroanalytical properties, enhancing the sensitivity and extending the detection limits for such electrodes modified with nanomaterials [24,25]. Generally, a thicker film would be desirable for analytical purposes because of the higher concentration of electrocatalytic sites and robustness of the electrode, but there are some drawbacks.…”

Section: Electrochemical Behaviormentioning

confidence: 99%

Highly Sensitive Amperometric Glucose Sensors Based on Nanostructured α‐Ni(OH)₂ Electrodes

Martins¹,

Rocha²,

Angnes³

et al. 2011

Electroanalysis

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Stabilized a-Ni(OH) 2 nanoparticle modified fluorine doped tin oxide (FTO) electrodes were shown to be excellent glucose amperometric FIA sensors exhibiting high specific sensitivity (446 mA mM À1 cm À2 ), low limit of detection (3 mM) and high analytical frequency (128 analyses/hour). The electrodes were constituted by~20 nm nanoparticles and the limit of detection was only slightly improved in hydrodynamic as compared to diffusional conditions reflecting the enhanced surface area and the moderate heterogeneous electron transfer rates at the nanostructured aNi(OH) 2 /solution interface.

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“…At an applied potential of +0.45 mV, the ferrocenyl group is oxidized to the ferrocenium cation and the catecholate group is oxidized to the benzoquinone form. Recent work by Curulli et al 21 using TiO 2 electrodes modified with ferrocene monocarboxylic acid or catechol showed that catechol is oxidized at a potential ∼100 mV lower than that for ferrocene carboxylic acid. Interestingly, the catechol oxidation was found to be reversible in buffered solution.…”

Section: Resultsmentioning

confidence: 99%

The instructive redox behaviour of 4‐ferrocenylcatechol on nanocrystalline titanium dioxide electrodes

Maharaj

McDonagh

Colbran

2007

Applied Organom Chemis

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An investigation into the redox behaviour of 4-ferrocenylcatechol bound to nanocrystalline TiO 2 electrodes identified a limitation to the use of catechol as an electron-transfer facilitating anchoring group. 4-Ferrocenylcatechol was adsorbed to transparent nanocrystalline TiO 2 electrodes. UV-visible spectra of the modified electrode were recorded in an acetonitrile-electrolyte solution. At an applied potential of +0.45 mV (vs Ag/AgCl/Cl − ) the ferrocenyl group oxidized to the ferrocenium cation and the catecholate group oxidized to the benzoquinone form. Subsequent application of a potential of 0 V reduced the ferrocenium to ferrocene but, owing to the irreversibility of the catechol oxidation in aprotic solvents, benzoquinone is not reduced to catecholate and subsequently desorbs and is lost due into solution. Electrochromic switching of the ferrocenyl electrochromophore on TiO 2 with aprotic electrolyte is, therefore, irreversible.

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Smart (Nano) materials: TiO2 nanostructured films to modify electrodes for assembling of new electrochemical probes

Cited by 51 publications

References 24 publications

Immobilization of GOD and HRP enzymes on nanostructured substrates

Immobilization of GOD and HRP enzymes on nanostructured substrates

Highly Sensitive Amperometric Glucose Sensors Based on Nanostructured α‐Ni(OH)₂ Electrodes

The instructive redox behaviour of 4‐ferrocenylcatechol on nanocrystalline titanium dioxide electrodes

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Smart (Nano) materials: TiO2 nanostructured films to modify electrodes for assembling of new electrochemical probes

Cited by 51 publications

References 24 publications

Immobilization of GOD and HRP enzymes on nanostructured substrates

Immobilization of GOD and HRP enzymes on nanostructured substrates

Highly Sensitive Amperometric Glucose Sensors Based on Nanostructured α‐Ni(OH)2 Electrodes

The instructive redox behaviour of 4‐ferrocenylcatechol on nanocrystalline titanium dioxide electrodes

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Product

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Highly Sensitive Amperometric Glucose Sensors Based on Nanostructured α‐Ni(OH)₂ Electrodes