Fabrication of magnetic nickel-tungsten-phosphorus particles by electroless deposition

Chun Han Chen, Ming Kai Chang, Bing-Hung Chen, D. J. Lee

Research output: Contribution to conferencePaper

Abstract

Nickel-tungsten-phosphorus (Ni-W-P) particles with an average size of ca. 200 nm were fabricated by electroless deposition (ED) on silica particles and Au seeds. For ED processes to proceed on silica surface, a thin Au shell of ca. 5nm is introduced at first for Ni-W-P to grow subsequently. TEM, SEM equipped with EDX, Vibrating Sample Magnetometer (VSM), SQUID and FT-IR were employed to characterize the as-deposited Ni-W-P nanoparticles. It is found that a less deposition temperature near 70, aC is sufficient to deposit Ni-W-P particles, in contrast to 90, aC required for the Ni-W-P deposition on planar substrates. EDX and FT-IR confirms that Au has been covalently deposited onto silica. The nickel-content in as-deposited Ni-W-P particles is around 90% by weight. The magnetization curve for the Ni-W-P particles shows no hysteresis, though nickel is known to be ferromagnetic. Magnetic properties of these Ni-W-P particles are profoundly influence on the P-contents in these particles. The Curie temperatures of these particles are around 300 K, whereas saturation magnetization ranges from 0.1 to 20 emu/g.

Original languageEnglish
Number of pages1
Publication statusPublished - 2005 Dec 1
Event05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States
Duration: 2005 Oct 302005 Nov 4

Other

Other05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
CountryUnited States
CityCincinnati, OH
Period05-10-3005-11-04

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Chen, C. H., Chang, M. K., Chen, B-H., & Lee, D. J. (2005). Fabrication of magnetic nickel-tungsten-phosphorus particles by electroless deposition. Paper presented at 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Cincinnati, OH, United States.