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Growth and Structure of ZnO Nanorods on a Sub-Micrometer Glass Pipette and Their Application as Intracellular Potentiometric Selective Ion Sensors

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Department of Science and Technology, Campus Norrköping, Linköping University, SE-60174 Norrköping Sweden
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Department of Clinical and Experimental Medicine, Division of Cell Biology, Linköping University, SE-58185 Linköping, Sweden
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Department of Physics (IFM), Linkoping University, SE-581 83 Linköping, Sweden
*
Author to whom correspondence should be addressed.
Materials 2010, 3(9), 4657-4667; https://doi.org/10.3390/ma3094657
Received: 20 July 2010 / Revised: 2 September 2010 / Accepted: 7 September 2010 / Published: 9 September 2010
(This article belongs to the Special Issue Bio-devices and Materials)
This paper presents the growth and structure of ZnO nanorods on a sub-micrometer glass pipette and their application as an intracellular selective ion sensor. Highly oriented, vertical and aligned ZnO nanorods were grown on the tip of a borosilicate glass capillary (0.7 µm in diameter) by the low temperature aqueous chemical growth (ACG) technique. The relatively large surface-to-volume ratio of ZnO nanorods makes them attractive for electrochemical sensing. Transmission electron microscopy studies show that ZnO nanorods are single crystals and grow along the crystal’s c-axis. The ZnO nanorods were functionalized with a polymeric membrane for selective intracellular measurements of Na+. The membrane-coated ZnO nanorods exhibited a Na+-dependent electrochemical potential difference versus an Ag/AgCl reference micro-electrode within a wide concentration range from 0.5 mM to 100 mM. The fabrication of functionalized ZnO nanorods paves the way to sense a wide range of biochemical species at the intracellular level. View Full-Text
Keywords: ZnO nanorods; HRTEM; functionalization; membrane; intracellular sensor ZnO nanorods; HRTEM; functionalization; membrane; intracellular sensor
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Asif, M.H.; Nur, O.; Willander, M.; Strålfors, P.; Brännmark, C.; Elinder, F.; Englund, U.H.; Lu, J.; Hultman, L. Growth and Structure of ZnO Nanorods on a Sub-Micrometer Glass Pipette and Their Application as Intracellular Potentiometric Selective Ion Sensors. Materials 2010, 3, 4657-4667.

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