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Precision pH Sensor Based on WO3 Nanofiber-Polymer Composites and Differential Amplification

Title
Precision pH Sensor Based on WO3 Nanofiber-Polymer Composites and Differential Amplification
Author
최선진
Keywords
WO3 nanofiber; porous polymer; MOSFET; differential amplifier; pH sensor
Issue Date
2019-10
Publisher
AMER CHEMICAL SOC
Citation
ACS SENSORS, v. 4, no. 10, Page. 2593-2598
Abstract
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, ID 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 (Delta pH = 0.43), which demonstrates a practical application for pH monitoring in ocean environments.
URI
https://pubs.acs.org/doi/10.1021/acssensors.9b01579https://repository.hanyang.ac.kr/handle/20.500.11754/154711
ISSN
2379-3694
DOI
10.1021/acssensors.9b01579
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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