Synthesis and Measurement of Magnetic Cobalt DNA-Templated Nanowire
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0921-T02-10
Synthesis and Measurement of Magnetic Cobalt DNA-Templated Nanowire Chia-Hsin Lin, Shi-Yuan Tong, Shin-Wei Lin, Hsin-Lung Chen, Yi-Chun Liu, Hsien-Kuang Lin, Wen-Lian Liu, Syh-Yuh Cheng, and Yi-Hui Wang Material and Chemical Research Laboratories, Industrial Technology Research Institute, I300, MCL/ITRI, Rm.324, Bldg.77, 195 Sec.4, Chung Hsing Rd., Chutung, Hsinchu, Taiwan, 300, Taiwan ABSTRACT Biomaterials such as DNA are currently being explored as potential application in nanotechnology. DNA templates were immobilized on crystal-violet-treated mica by spin coating as a grid-like network. The DNA templates were then activated with PdCl2, followed by reduction with dimethylamine borane (DMAB) to form seeding nanoclusters on the DNA chain. Afterward the DNA chain with deposition of zero-valence Pd nanoclusters was grew in a Co electroless plating bath. SEM/EDS analysis revealed that Co nanoparticles could be assembled on the DNA template to form magnetic nanowires with a diameter of 25nm to 250nm by a conventional electroless plating. Vibrating Sample Magnetometer analysis indicated that Co-DNA nanowires showed a paramagnetic characteristic. Grid-like networks of DNA template were effectively preserved after Co electroless plating. These characteristics indicated that DNA is an ideal template for the production of magnetic nanowires, which could be useful in the development of high-density memory storage or magnetic field sensors. INTRODUCTION Nanowires, nanotubes or nanorods, has been discussed extensively in recent years. The material properties exhibited by such structures have considerable potential for the development of functional nanoscale electronic and optoelectronic devices [1–6]. In contrast to the nanowire prepared by porous alumina template, so-called deoxyribonucleic acid (DNA)-templated selfassembly of nanowires has received a good deal of attention in the scientific literature. The specific recognition property and large aspect ratio of DNA make it a promising soft template for fabrication of nanowires and nanodevices from bottom up [1]. The first metallic DNAtemplated Ag nanowire was demonstrated by Braun et. al [7]. The conductivity of metallic DNA-templated Ag nanowire was substantially greater than that of untreated material. More recently, Pd [8], Pt [9], Au [10] and Cu [11] nanowires have been made by the same approach. Nanowires made of magnetic materials might be suitable for development of high-density memory storage devices or magnetic field sensors [12,13]. However, little has been made to prepare magnetic nanowires by the bio-template approach. Up to the present, only Co and Ni nanowires have been fabricated by electroless plating on bio-templates, for instance microtubules [14], peptides [15], lambda DNA and tobacco mosaic virus [16, 17]. The control and corresponding property of these magnetic nanowires has not been investigated systematically. In this study, nanoparticles of ferromagnetic Co have been self-assembled into network-like DNA template on mica substrate by an el
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