Bio-Mimetic Ion Imprinted Polymer Based Potentiometric Mercury Sensor Composed of Nano-Materials

摘要

A mercury selective sensor based on a novel biomimetic recognition element and nano-compositecarbon paste electrode is introduced. The artificial host was imprinted in vinyl pyridine based cross- linked polymer. The nano-composite paste were made of ion imprinted polymer (IIP) as a sensingelement, multi-walled carbon nanotube (MWCNT), nanosilica (NS), graphite powder, and roomtemperature ionic liquid (RTIL). The best results were obtained from the nano-composite sensor withthe electrode composition of 5% MWCNT, 1% NS, 15% IIP, 10% RTIL, and 69% graphite powder.-1 -7 The proposed sensor shows a Nernstian response (31.10.2 mV decade ) in the range of 1.010 - -2 -71.010 M with detection limit of 1.010 M. The response of the sensor is independent of pH in therange of 3.5-9.0. The nano-composite based Hg(II) sensor displayed very good selectivity, responsetime, and specially, lifetime.