عنوان المقالة:تحضير ودراسة الخواص الكهربائية للتراكيب النانوية لهجين النحاس والبوليمرات الموصلة Preparation and electrical properties of a copper-conductive polymer hybrid nanostructure
Reda Hassanien, Mahdi Almaky, Andrew Houlton, Ben R. Horrocks
Abstract
N-(3-Pyrrol-1-yl-propyl)-4,4'-bipyridinium hexafluorophosphate (NPPBH) has been synthesized andpolymerized in the presence of DNA to produce DNA-templated polymer nanowires (polyNPPBH/DNA).The pyridine group serves as a ligand for Cu(II) and to direct the subsequent electroless deposition of Cuto form Cu/polyNPPBH/DNA nanowires. UV-vis absorption spectra of the hybrid materials show anabsorption peak corresponding to the plasmon resonance of Cu0particles at about 550 nm. AFMobservations show that the Cu/polyNPPBH/DNA nanowires have a wide range of diameters, 10–30 nm,but individual nanowires exhibit a uniform and continuous morphology. The electrical properties of thewires were examined by scanned conductance microscopy and conductive AFM. The nanowireconductivity was estimated using the diameter and width of the as-prepared nanowires to calculate thecross-section area (assumed elliptical). We estimate 0.420.019 S cm-1for the Cu/polyNPPBH/DNAnanowire conductivity. This is substantially greater than the polyNPPBH/DNA conductivity (2.10.26102Scm-1) which indicates that the current pathway isviathe copper metallization, however the valueis much lower than bulk Cu. Although the AFM images show relatively regular metal coverage of thepolymer/DNA wires, the presence of discontinuities or voids along the length of the nanostructure islikely. Such gaps in the metal structure may introduce significant tunneling barriers and a granular metalmodel is a more appropriate description of the Cu/polyNPPBH/DNA nanowires than a simple metallicnanowire
د. المهدي محمد المكي | Dr. Mahdi Mohammed Almaky | 9813