Precision pH Sensor Based on WO3 Nanofiber-Polymer Composites and Differential Amplification
- Authors
- Choi, Seon Jin; Savagatrup, Suchol; Kim, Yoonseob; Lang, Jeffrey H; Swager, Timothy M.
- Issue Date
- Oct-2019
- Publisher
- AMER CHEMICAL SOC
- Keywords
- WO3 nanofiber; porous polymer; MOSFET; differential amplifier; pH sensor
- Citation
- ACS SENSORS, v.4, no.10, pp.2593 - 2598
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS SENSORS
- Volume
- 4
- Number
- 10
- Start Page
- 2593
- End Page
- 2598
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/12382
- DOI
- 10.1021/acssensors.9b01579
- ISSN
- 2379-3694
- 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.
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