Comparative Sensibility Study of WO3 ph Sensor Using EGFET and Ciclic Voltammetry

Campos, Renata de Castro; Cestarolli, Dane Tadeu; Mulato, Marcelo; Guerra, Elídia Maria

doi:10.1590/1516-1439.252513

Cited by 29 publications

(9 citation statements)

References 23 publications

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“…While metal/metal oxide systems are commonly used in classical potentiometric mode in combination with a reference electrode to generate a potential reflecting the pH [44,[57][58][59][60], it is also possible to employ them in amperometric mode in which a pH sensitive voltammetric signal is used, the peak potential of which is used to indicate the pH [61][62][63]. One attraction of this approach is that the measurement generates a current-voltage plot the shape of which allows the assessment of the 'quality' of the measurement and hence the reliability of the data.…”

Section: Introductionmentioning

confidence: 99%

A simplified methodology: pH sensing using an in situ fabricated Ir electrode under neutral conditions

Chen

et al. 2021

J Solid State Electrochem

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Herein, a simplified fabrication method for the producing of a pH-sensitive iridium electrode is developed. The in situ electrochemical fabrication of an iridium oxide film is optimized and shown to be achievable under neutral conditions rather than the acidic conditions hitherto employed. The formation of a pH sensitive Ir(III/IV) hydrous film is confirmed via XPS. The amperometric pH-sensing properties of this electrochemically generated material were investigated using square wave voltammetry. In the pH range 2–13, the iridium oxide redox signal has a pH dependency of 86.1 ± 1.1 mV per pH unit for midpoint potentials with uncertainties being ± 0.01–0.05 pH. Finally, the newly developed pH sensor was used to measure the pH of a natural water sample with excellent results as compared to a conventional glass pH probe.

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Section: Introductionmentioning

confidence: 99%

A simplified methodology: pH sensing using an in situ fabricated Ir electrode under neutral conditions

Chen

et al. 2021

J Solid State Electrochem

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“…WO 3 films are utilized in electrochromic devices, photocatalysis, and gas sensors [1][2][3] . In addition, the production of tungsten powder from high purity WO 3 through hydrogen reduction is still the most important application in the field of powder metallurgy 4 .…”

Section: Introductionmentioning

confidence: 99%

Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method

Ghasemi

Jafari

2017

Mat. Res.

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Sol-gel modified Pechini's method was used to prepare WO 3 nanopowders using dicarboxylic acid and polyethylene glycol as the chelating agent and polymeric source, respectively. WO 3 powders were first prepared by calcination of resin precursor at 550ºC under various initial concentrations of metal ion (12.5-50 mmol), acid (125-500 mmol), a complexing agent (32-262 mmol), and polyethylene glycol (1-16.5 mmol) in the air atmosphere. The products were characterized using X-ray powder diffraction, field emission scanning electron microscopy, and energy dispersive spectroscopy. The results revealed that the WO 3 nanopowders prepared with different amounts of chelating agent and polyethylene glycol, crystallized in monoclinic phase. The nanopowders were impurity-free due to the presence of the complexing agent and polyethylene glycol as carbon sources. Morphological evolution indicated that the nanopowders evolved from rod-like to regular and spherical shapes, depending on complexing agent and polyethylene glycol amounts. Nanopowders with an average particle size of approximately 58 nm and a narrow size distribution were obtained.

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“…Therefore, the majority of works using EGFET as part of a sensor describes it as a pH-sensor 3,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] . PH monitoring and control, for itself, are quite important.…”

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confidence: 99%

Mechanisms of Ion Detection for FET-Sensors Using FTO: Role of Cleaning Process, pH Sequence and Electrical Resistivity

Nascimento

Mulato

2017

Mat. Res.

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The use of FTO samples as an extended gate field effect transistor biosensor is presented. The FTO samples were produced by spray pyrolysis technique. The cleaning process is shown to have a fundamental importance for the final sensitivity of the samples when multiple re-usage is adopted. The role of electrical resistivity and morphology of the films are investigated. The influence of pH sequence of measurements from 2 to 12 is presented. Both increasing and decreasing the pH values sequence of measurements are compared. Electrical, morphological, time evolution and electrochemical experiments are correlated in the main discussion. A physical-chemical model is presented to explain the main mechanisms of charge adsorption and desorption. Parameters not commonly reported in the literature are proven to have fundamental importance in sensors behavior and characterization.

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Comparative Sensibility Study of WO3 ph Sensor Using EGFET and Ciclic Voltammetry

Cited by 29 publications

References 23 publications

A simplified methodology: pH sensing using an in situ fabricated Ir electrode under neutral conditions

A simplified methodology: pH sensing using an in situ fabricated Ir electrode under neutral conditions

Morphological Characterization of Tungsten Trioxide Nanopowders Synthesized by Sol-Gel Modified Pechini's Method

Mechanisms of Ion Detection for FET-Sensors Using FTO: Role of Cleaning Process, pH Sequence and Electrical Resistivity

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