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Fabrication of Nickel/Gold Multilayered Shells on Polystyrene Bead Cores by Sequential Electroless Deposition Processes

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Core-shell conductive beads composed of a polystyrene (PS) core and a metallic shell of nickel-gold were investigated to identify the metal-polymer interface and the electromechanical response under a large deformation. Using dispersion polymerization, the average PS bead diameter was controlled to between 1.5 μm and 4.1 μm by adjusting the water and initiator concentrations, to give a monodispersed particle size distribution. In the electroless deposition processes of Ni followed by gold, the Ni-P shell was initially formed with a thickness of 43 nm, part of which was replaced by gold to give Ni-P and Au shell layers with thicknesses of 39 nm and 43 nm, respectively, as confirmed by transmission electron microscopy (TEM) observation. The electromechanical indentation test of a single core-shell bead showed that its resistance was 9.8 Ω/bead at a compressive deformation of 35%.

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Acknowledgements

This work was supported by Grant No. R012006000103480 from the Basic Research Program of the Korea Science & Engineering Foundation. We also appreciate the instrumental and technical support provided by the GRRC program from Gyeonggi Province and Local Government Initiated R&D Program (Project No. 2004-0693-200) of the Korea Ministry of Commerce, Industry and Energy, in conjunction with Gyeonggi Province.

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Correspondence to Jae-Do Nam.

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Lee, JH., Oh, J.S., Lee, P.C. et al. Fabrication of Nickel/Gold Multilayered Shells on Polystyrene Bead Cores by Sequential Electroless Deposition Processes. J. Electron. Mater. 37, 1648–1652 (2008). https://doi.org/10.1007/s11664-008-0503-7

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  • DOI: https://doi.org/10.1007/s11664-008-0503-7

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