عنوان المقالة: Metal-Conductive Polymer Core-Shell Nanowires: Electroless Reduction of Pd and Cu on Polypyrrole/DNA Templates Bearing 2-2’-Bipyridyl Groups
د. المهدي محمد المكي | Dr. Mahdi Mohammed Almaky | 9781
Publication Type
Journal
Arabic Authors
English Authors
Mahdi Almaky* , Reda Hassanien , William Clegg , Ross Harrington , Andrew Houlton and Benjamin Horrocks
Abstract
A method for the preparation of conductive polymer nanowires bearing metal ion chelating 2,2’-bipyridyl groups is described. N-(3-pyrrol-1-yl-propyl)-2,2'-bipyridinium hexafluorophosphate (NP2PBH) was templated on λ-DNA in aqueous solution using FeCl3 as oxidant to initiate polymerization. The polyNP2PBH/DNA nanowires were then decorated with metals (Cu or Pd) by electroless deposition [Cu(NO3)2/ascorbate or PdCl4 2- /NaBH4]. UV-vis absorption spectra of the hybrid materials show the absorption peak due to the plasmon resonance of Cu at about 550 nm and a broad continuous band consistent with metallic Pd in the range 300−700 nm. The morphology, size and electrical properties of the hybrid nanostructures have been characterized using scanning probe techniques (atomic force microscopy (AFM), scanning conductance microscopy (SCM) and conductive atomic force microscopy (cAFM)). The polyNP2PBH/DNA nanowires show a continuous, smooth and uniform appearance (mean diameter 5.0 nm). Cu deposits on polyNP2PBH/DNA nanowires by a nucleation and growth process that leads eventually to smooth, conductive Cu nanowires. In contrast, Pd deposits in a non-uniform manner on polyNP2PBH/DNA and has inconsistent electrical conductivity. The electrical conductivity of single Cu/polyNP2PBH/DNA nanowires was estimated to be 1.6 ± 0.27 S cm-1 which we suggest is limited by electron transfer between Cu grains.
Publication Date
4/14/2020
Publisher
International Journal of Scientific Research in Science and Technology IJSRST
Volume No
7
Issue No
2
ISSN/ISBN
ISSN: 2395-602X
DOI
https://doi.org/10.32628/IJSRST207250
Pages
406 - 423
External Link
https://scholar.google.com/citations?user=biED6sgAAAAJ&hl=ar#d=gs_md_cita-d&u=%2Fcitations%3Fview_op%3Dview_citation%26hl%3Dar%26user%3DbiED6sgAAAAJ%26citation_for_view%3DbiED6sgAAAAJ%3AW7OEmFMy1HYC%26tzom%3D-120
Keywords
Copper, Palladium, DNA, Nanowires, Poly(N-substituted) Pyrrole, Conductivity, Hybrid Nanostructures
رجوع