RuO2–IrO2 solid state micro-liquid film pH sensor based on polymeric precursor method

The glass-type electrodes based pH sensors suffer from the weakness of fragility and poor stability in acid/alkali solution. To overcome these disadvantages, a novel solid-state pH sensor based on a RuO2–IrO2 H+ sensitive electrode via a polymeric precursor method was developed in this paper. The electrochemical performance of pH sensor was tested in different conditions. The experimental results showed that the sensitivity of the pH sensor could reach a high level of 52.0 mV/pH in a wide pH range of 2 ∼ 10. Furthermore, the response of pH sensor was fast and the response time remained less than 2.2 s even under varying pH conditions. The experiment was repeated three times during a period of time, the potential difference of pH sensor was between ±0.3 mV and ±0.9 mV in different pH value solutions, demonstrating its good stability, repeatability, recyclability and small potential drift. The negligible interference of Li+, Na+, K+, Ca2+, Mg2+, to the proposed pH sensor was also proven experimentally.

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Photoluminescence property of powders prepared by solid state reaction and polymeric precursor method

Physica B Condensed Matter ◽

10.1016/j.physb.2009.05.014 ◽

2009 ◽

Vol 404 (20) ◽

pp. 3341-3347 ◽

Cited By ~ 42

Author(s):

S.K. Rout ◽

L.S. Cavalcante ◽

J.C. Sczancoski ◽

T. Badapanda ◽

S. Panigrahi ◽

...

Keyword(s):

Solid State ◽

Solid State Reaction ◽

Photoluminescence Property ◽

Polymeric Precursor Method ◽

Polymeric Precursor ◽

Precursor Method

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Layered niobate KNb 3 O 8 synthesized by thepolymeric precursor method

Cerâmica ◽

10.1590/0366-69132018643692269 ◽

2018 ◽

Vol 64 (369) ◽

pp. 104-108 ◽

Cited By ~ 2

Author(s):

J. K. D. de Souza ◽

L. M. C. Honório ◽

J. M. Ferreira ◽

S. M. Torres ◽

I. M. G. Santos ◽

...

Keyword(s):

Solid State ◽

Surface Area ◽

Pore Volume ◽

Synthesis Method ◽

Total Pore Volume ◽

Polymeric Precursor Method ◽

Polymeric Precursor ◽

Precursor Method ◽

Solid State Method ◽

State Method

Abstract The polymeric precursor method was used for the synthesis of KNb3O8 and compared to the solid-state method. The materials were characterized by X-ray diffraction (XRD), infrared spectroscopy, Raman spectroscopy, scanning electron microscopy, and determination of surface area and total pore volume by nitrogen isotherms at 77 K. The material prepared by the polymeric precursor method was single-phase while K2Nb4O11 was obtained as secondary phase when the solid-state method was used, as evidenced by the XRD patterns and the Raman spectra. The morphology of the materials was significantly altered by the synthesis method, as the KNb3O8 prepared by the polymeric precursor method presented a more porous morphology leading to a higher surface area and pore volume.

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Polypyrrole–Methyl Orange Raman pH Sensor

Polymers ◽

10.3390/polym11040715 ◽

2019 ◽

Vol 11 (4) ◽

pp. 715 ◽

Cited By ~ 4

Author(s):

Tomasz Czaja ◽

Kamil Wójcik ◽

Maria Grzeszczuk ◽

Roman Szostak

Keyword(s):

Methyl Orange ◽

Raman Spectra ◽

Ph Value ◽

Ph Sensor ◽

First Case ◽

Relative Standard ◽

Wide Ph Range ◽

Analogous Model ◽

Ph Range

An easy-to-prepare pH sensor based on electrochemically obtained polypyrrole doped with methyl orange ions is described. It enables the determination of a pH value in the 3–13 range for volumes below 1 µL. In a wide pH range, resonance and pre-resonance methyl orange Raman spectra, excited with the 514.5 nm line of an Ar+ laser, changed noticeably in function of H+ concentration. Two types of measurements were performed. In the first case, Raman spectra of the analyzed solutions were collected for samples placed on the sensor surface using a confocal microscope equipped with a 10x objective. Next, measurements were conducted for the same samples without the sensor. On the basis of these spectra, partial least-squares models were elaborated and validated. Relative standard errors of prediction for calibration, validation, and test samples were found to be in the 3.7%–3.9% range. An analogous model build using spectra registered without the sensor was characterized by slightly worse parameters.

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