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Title: Fabrication of Metal Tetraamine Phthalocyanine Polymer Modified Electrodes for Nitric Oxide Sensing Studies
Keywords: MALDI TOF, nanoporous, AAO, nanotube, MTAPc, NO sensor
Issue Date: 29-Dec-2011
Citation: YAP CHUAN MING (2011-12-29). Fabrication of Metal Tetraamine Phthalocyanine Polymer Modified Electrodes for Nitric Oxide Sensing Studies. ScholarBank@NUS Repository.
Abstract: This thesis reports on the electrochemical detection of dissolved nitric oxide (NO) in phosphate buffered saline (pH 7.4) by electropolymerized-Metallo 4?, 4??, 4???, 4???? tetra-amine Phthalocyanine (poly-MTAPc) modified electrodes. A series of three MTAPcs bearing different metal centers (Cu2+, Zn2+ and Pt2+) was synthesized by a facile Two-step microwave heating method. The flat glassy carbon electrode (GCE) and a Pt-coated nanoporous AAO membrane have been selected as the bare substrates for poly-MTAPc modification. For these two modified electrode systems, the nanoporous AAO electrode is represented by a densely-packed array of poly-MTAPc nanotubes within the pores, whereas the poly-MTAPc is only a thin film on the flat GCE. Compared to the flat modified GCE, the high-density poly-MTAPc nanotube array within the modified AAO electrode provided a high faradaic (signal) to charging (background) current ratio leading to 10-15 times improvement in sensitivity and a 10 times drop in detection limit. At sub-micromolar NO level, regardless of the metal centers, the two sensor systems showed no significant differences in their detection limit, sensitivity and linearity. Based on the two electrode systems, calibration by Differential Pulse Voltammetry and Amperometry (DPV and DPA) indicated that the MTAPc-mediated electro-oxidation of NO proceeds via a ligand-based redox process of the MTAPc unit where any metal-based redox contribution could be dependent on the analyte concentration.
Appears in Collections:Master's Theses (Open)

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