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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Veröffentlicht in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2017-09, Vol.801, p.315-318
Hauptverfasser: Cisternas, Regina, Ballesteros, Luis, Valenzuela, María Luisa, Kahlert, Heike, Scholz, Fritz
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Sprache:eng
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Zusammenfassung: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