Electropolymerized Poly(3-methylthiophene)-Based Potentiometric Electrode: An Alternative pH Sensor

Authors

  • Jelyn I. Jabon Department of Chemistry, College of Science, University of Santo Tomas, España, Manila
  • Christina A. Binag Research Center for Natural Sciences, The University of Santo Tomas, España, Manila

DOI:

https://doi.org/10.26534/kimika.v16i1.1-5

Keywords:

poly(3-methylthiophene), conductive polymer, electrochemical polymerization, pH sensor, XPS, SEM

Abstract

A potentiometric electrode based on a conducting polymer such as poly(3-methylthiophene) (P3MTp) was developed through electrochemical polymerization. The response of the P3MTp-based electrode showed a sensitivity of -44.952 ± 1.13 mV/pH and a linearity of -0.997 towards [H+] in the concentration range of 10^-3 to 10^-10 M. The electrode exhibited good reproducibility(~ 5% r.s.d.), minimum hysteresis (Δm = 1.2504), and low drift (~5% r.s.d.). The polymer growth was monitored by cyclic voltammetry and produced an oxidation peak at Ea ~ 1.35 V The electroactive P3MTp film generated two anodic peaks (Ea1 ~ 0.45 V ; Ea2 ~ 0.99 V) and a cathodic peak at Ec ~ 0.86 V The electrode was found through electron microscopy to have a uniform spongy surface. X-ray photoelectron spectroscopy of the polymer membrane surface revealed the characteristic S 2s and S 2p peaks.

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How to Cite

Jabon, J. I., & Binag, C. A. (2000). Electropolymerized Poly(3-methylthiophene)-Based Potentiometric Electrode: An Alternative pH Sensor. KIMIKA, 16(1), 1–5. https://doi.org/10.26534/kimika.v16i1.1-5

Issue

Vol. 16 No. 1 (2000)

Section

Research Articles

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