Decreasing the time response of calibration-free pH sensors based on tungsten bronze nanocrystals

A considerable improvement of time constants of tungsten bronze pH sensors was achieved by decreasing the crystal size of the tungsten bronze previously reported by the authors. Experiments have been performed on the basis of a previously developed calibration-free pH tungsten bronze electrode. The...

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Bibliographic Details
Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2017-09, Vol.801, p.315-318
Main Authors: Cisternas, Regina, Ballesteros, Luis, Valenzuela, María Luisa, Kahlert, Heike, Scholz, Fritz
Format: Article
Language:English
Subjects:
Biosensors
Bronze
Calibration
Calibration-free pH measurements
Crystal structure
Direct contact ion sensitive electrodes
Nanocrystals
pH sensor
Sensors
Sodium chloride
Sodium tungstate
Sodium tungsten bronze
Time response
Tungsten
Tungsten bronze
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Summary:A considerable improvement of time constants of tungsten bronze pH sensors was achieved by decreasing the crystal size of the tungsten bronze previously reported by the authors. Experiments have been performed on the basis of a previously developed calibration-free pH tungsten bronze electrode. The nano-sizing of the tungsten bronze was realized by addition of sodium chloride to the Na2WO4/WO3 melt in which tungsten wires were oxidized. With increasing NaCl concentration, the crystals size decreased. [Display omitted] •A nano size crystals of tungsten bronze layer were synthesized on the surface of tungsten metal wires by a simple synthetic method.•A considerable decrease of time constant of tungsten bronze pH sensor was achieved (13 s! pH = 10)•The electrodes are stable over the time.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2017.08.005