Precision pH Sensor Based on WO3 Nanofiber-Polymer Composites and Differential Amplification.
ACS Sens
; 4(10): 2593-2598, 2019 10 25.
Article
en En
| MEDLINE
| ID: mdl-31573180
We report a new type of potentiometric pH sensor with sensitivity exceeding the theoretical Nernstian behavior (-59.1 mV/pH). For the pH-sensitive electrode, 1D tungsten oxide (WO3) nanofibers (NFs) were prepared to obtain large surface area and high porosity. These NFs were then stabilized in a reactive porous chloromethylated triptycene poly(ether sulfone) (Cl-TPES) binder, to facilitate proton diffusion into the polymer membrane. The measurements were performed with a differential amplifier using matched MOSFETs and providing a 10-fold amplified signal over a simple potentiometric determination. A high pH sensitivity of -377.5 mV/pH and a linearity of 0.9847 were achieved over the pH range of 6.90-8.94. Improved signal-to-noise ratios with large EMF signal changes of 175 mV were obtained in artificial seawater ranging pH 8.07-7.64 (ΔpH = 0.43), which demonstrates a practical application for pH monitoring in ocean environments.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Óxidos
/
Tungsteno
/
Povidona
/
Nanocompuestos
/
Nanofibras
/
Concentración de Iones de Hidrógeno
Idioma:
En
Revista:
ACS Sens
Año:
2019
Tipo del documento:
Article
Pais de publicación:
Estados Unidos