Selective calcium ion detection with functionalized ZnO nanorods-extendedgate MOSFET
2009 (English)In: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 24, no 11, 3379-3382 p.Article in journal (Refereed) Published
Zinc oxide nanorod-extended gate field effect transistor (MOSFET) is demonstrated for the detection of calcium (Ca2+) ions. ZnO nanorods were grown on the surface of a silver wire to produce an electrochemical nanosensor for selectively detecting Ca2+. The electrochemical response from the interaction between the ZnO nanorods and Ca2+ in an aqueous solution is coupled directly to the gate of a field effect transistor (MOSFET). The induced voltage change on the gate results in a measureable current response. In order to adapt the sensors for Ca2+ ions measurements in biological fluids with sufficient selectivity and stability, a plastic membrane coating containing ionophores was applied on the nanorods. The sensor exhibited a linear response within the range of interest from 1 μM to 1 mM. This work demonstrates a simple technique for sensitive detection of Ca2+ ions by efficient transfer of the chemical response directly to a standard electronic component producing a low impedance signal.
Place, publisher, year, edition, pages
ELSEVIER , 2009. Vol. 24, no 11, 3379-3382 p.
Calcium ions, electrochemical sensor, ZnO nanorods, MOSFET
IdentifiersURN: urn:nbn:se:liu:diva-19515DOI: 10.1016/j.bios.2009.04.011OAI: oai:DiVA.org:liu-19515DiVA: diva2:225281