Journal
SENSOR LETTERS
Volume 9, Issue 6, Pages 2127-2129Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/sl.2011.1803
Keywords
Calix[6]arene; Electrochemical Impedance Spectroscopy; Cobalt; Electrochemistry Sensor
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This work describes the attempts to develop a new type of modified electrode with high sensitivity towards cobalt ions, Co2+. The method is based upon the use of calix-[6]-arene, which is a macrocyclic molecule composed of six phenol units. Polyvinylchloride (PVC), and Polymethylhydrosiloxane (PMHS) were the polymers used and deposited as thin membranes incorporating calix-[6]-arene, on gold electrode. The electrical properties of the polymeric membrane have been characterized by electrochemical impedance spectroscopy (EIS). Linear ranges are respectively 10(-9) M to 10(-6) M for PVC based membrane and 10(-9) M to 10(-7) M for PMHS based membrane. The detection limit is about 10(-9.2) M for PVC based sensor and 10(-9) M for the PMHS based sensor. PMHS based membranes led to more sensitive cobalt sensor compared to PVC based membranes.
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