Title :
Potassium sensing with membrane-coated silicon nanowire field-effect transistors
Author :
Wipf, M. ; Stoop, R.L. ; Tarasov, A. ; Bedner, K. ; Fu, Wei ; Calame, M. ; Schonenberger, C.
Author_Institution :
Dept. of Phys., Univ. of Basel, Basel, Switzerland
Abstract :
Ion sensitive field-effect transistors (ISFETs) based on silicon nanowires (Si NWs) with high-k gate oxide layers display surface hydroxyl groups which are known to be sensitive to variations in pH and electrolyte concentration. To specifically detect other species than protons, oxide surfaces need to be chemically modified. In this work, we use polyvinyl chloride (PVC) membranes with embedded ionophores to specifically detect potassium ions. We find a high response of -38mV/decade in KCl concentration. Control measurements with MgCl and pH demonstrate the selectivity of the ionophore.
Keywords :
chemical sensors; ion sensitive field effect transistors; nanosensors; nanowires; pH measurement; polymers; potassium; potassium compounds; silicon; ISFET; K; KCl; PVC; Si; chemically modified oxide surface; electrolyte concentration; embedded ionophore; high-k gate oxide layer; ion sensitive field effect transistor; membrane coated silicon nanowire field effect transistors; pH concentration; polyvinyl chloride membrane; potassium sensing; surface hydroxyl group; Adsorption; Ions; Liquids; Nanobioscience; Sensors; Silicon; Transistors; ISFET; Silicon nanowire; chemical sensing; ionophores;
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS & EUROSENSORS XXVII), 2013 Transducers & Eurosensors XXVII: The 17th International Conference on
Conference_Location :
Barcelona
DOI :
10.1109/Transducers.2013.6626984