Title :
Electrochemical and surface characteristics of PAn/I- potentiometric membrane
Author :
Santiago, Karen S. ; Binag, Christina A. ; Sevilla, Fortunato, III
Author_Institution :
Univ. of Santo Tomas, Manila, Philippines
Abstract :
The PAn/I--based potentiometric membrane was prepared by carrying out galvanostatic electrochemical radical polymerization using the following optimized conditions: 1:1 mole ratio of aniline monomer and potassium iodide, 0.10 M potassium hydrogen phthalate buffer solution at pH 4, 30-minute TP without stirring, Pt wire support and 9.34 mA cm-2 current density. The sensor showed a hyper-Nernstian response of 87. 5 mV/-log aI-. The response for I- was linear (r = 0.9994) at a concentration range of 10-4 to 10-2 with an average tr = 2.3 minutes. Its membrane has been likewise investigated via SEM with EDX that showed its semi-fibrous morphological structure, and XPS which depicted the possible anion exchange mechanism at its surface.
Keywords :
X-ray chemical analysis; X-ray photoelectron spectra; chemical sensors; conducting polymers; electrochemistry; iodine; membranes; polymerisation; scanning electron microscopy; 30 min; EDX; I; PAn/I- potentiometric membrane; SEM; aniline monomer; galvanostatic electrochemical radical polymerization; hyper-Nernstian response; potassium hydrogen phthalate buffer solution; potassium iodide; semi-fibrous morphological structure; Biomembranes; Current density; Electrodes; Hydrogen; Monitoring; Polymers; Scanning electron microscopy; Spectroscopy; Surface morphology; Wire;
Conference_Titel :
Sensors and the International Conference on new Techniques in Pharmaceutical and Biomedical Research, 2005 Asian Conference on
Print_ISBN :
0-7803-9370-8
DOI :
10.1109/ASENSE.2005.1564505
