Precision pH Sensor Based on WO3 Nanofiber-Polymer Composites and Differential Amplification
Name
doi-10.1021 acssensors.9b01579.pdf
Description
Accepted version
Size
869.24 KB
Format
Adobe PDF
Checksum (MD5)
acec30819e5f5dd6a9952f6c23ceebb8
Author(s)
Choi, Seonjin
Savagatrup, Suchol
Kim, Yoonseob
Lang, Jeffrey H
Swager, Timothy M
Date Issued
October 2019
Journal
ACS Sensors
Publisher
American Chemical Society (ACS)
Citation
Choi, Seon-Jin et al. "Precision pH Sensor Based on WO3 Nanofiber-Polymer Composites and Differential Amplification." ACS Sensors 4, 10 (October 2019): 2593–2598 © 2019 American Chemical Society
Version
Author's final manuscript
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, 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.
MIT Department
Massachusetts Institute of Technology. Department of Chemistry
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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DOI of Published Version
https://doi.org/10.1021/acssensors.9b01579
