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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Electroless plating
Tungsten
Phosphorus
Silica
Nickel
Fabrication
Energy dispersive spectroscopy
SQUIDs
Magnetometers
Saturation magnetization
Curie temperature
Seed
Hysteresis
Magnetization
Magnetic properties
Deposits
Nanoparticles
Transmission electron microscopy
Scanning electron microscopy
Substrates

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.
Chen, Chun Han ; Chang, Ming Kai ; Chen, Bing-Hung ; Lee, D. J. / 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.1 p.
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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.",
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Chen, CH, Chang, MK, Chen, B-H & Lee, DJ 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, 05-10-30 - 05-11-04, .

Fabrication of magnetic nickel-tungsten-phosphorus particles by electroless deposition. / Chen, Chun Han; Chang, Ming Kai; Chen, Bing-Hung; Lee, D. J.

2005. Paper presented at 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Cincinnati, OH, United States.

Research output: Contribution to conferencePaper

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AU - Chen, Chun Han

AU - Chang, Ming Kai

AU - Chen, Bing-Hung

AU - Lee, D. J.

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N2 - 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.

AB - 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.

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Chen CH, Chang MK, Chen B-H, Lee DJ. Fabrication of magnetic nickel-tungsten-phosphorus particles by electroless deposition. 2005. Paper presented at 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase, Cincinnati, OH, United States.