Experimental Investigations of Ni Nanoparticle-Polyurethane Acrylic Composite for Electrical Conductivity Enhancement
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.310
Experimental Investigations of Ni NanoparticlePolyurethane Acrylic Composite for Electrical Conductivity Enhancement Adrian Goodwin1, Ajit D. Kelkar1, Ram V. Mohan1 1
Department of Nanoengineering, Joint School of Nanoscience and Nanoengineering, North Carolina A&T State University, Greensboro, NC, United States.
ABSTRACT
Conductive composites are being considered for use in applications such as electromagnetic shielding. Prior work has shown correlation of electrical conductivity to the microstructure of corresponding composite. In the present paper, composites consisting of polyurethane acrylic and dispersed nickel nanoparticles were fabricated, and tested for their electrical conductivity. In the fabrication process, half of the suspensions were agitated by sonication and half were not. Correlations between electrical conductivity and composite microstructural details are presented. These correlations show an optimum concentration of nickel nanoparticles that result in maximum conductivity enhancement. In addition, sonicating the suspensions increased conductivity of resulting nanocomposites. Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) images were used to estimate surface concentration and distribution of Nickel nanoparticles, and were correlated to electrical conductivity measurements. Parameters such as number of particles in contact and junction distance between the nano particles in the composites are suggested as a way of enhancing electrical conductivity.
INTRODUCTION Conductive composites consist of a matrix, which is usually an insulated polymer with an electrically conductive filler such as nickel nanoparticles embedded in the matrix. The electrical conductivity of the composite can be varied depending on concentration of the filler in composite. Electromagnetic shielding is material that surrounds and protects sensitive electronics from outside electromagnetic fields. Conductive composites are an attractive way of providing electromagnetic shielding as they can weigh less than traditional materials used for electromagnetic shielding, and
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have sufficiently high electrical conductivity. Conductive composites are also used in applications such as antennas, and other systems that require electrical conductivity. An advantage of nickel nanoparticle conductive composites is that they are relatively lowcost, and could provide a viable alternative to other types of conductive composites in relevant applications [1]-[6]. METHODOLOGY FOR FABRICATION AND TESTING The objectives of present study are stated first, followed by methodology used in the present work to produce the suspensions and their conductive composites. The first objective is to effectively disperse an
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