Li, Q.; Fan, S.; Han, W.; Sun, C.; Liang, W. Jpn. J. Appl. Phys. 1997, 36, L501-L503.
One of the first papers on the subject.
The idea comes from the knowledge of electroless plating on various substrates. See, for example:
Menon and Martin, Anal. Chem. 1995, 67, 1920.
Material: Ni-MWNT
Synthesis:
Disperse MWNTs (from ethylene CVD, as-produced) in 0.1M SnCl2/0.1M HCl by 30 min sonication; the "pre-activated" tubes were "further activated" in 0.0014M PdCl2/0.25M HCl for another 30 min; they were then placed in an electroless plating bath, consisting of a wealth of components including Ni source (See Table).
This method is very sensitive to pH (8.25, 8.5, and 8.75 were exercised): Reaction rate increases with pH value. Thus, low pH might be desirable for less particle aggregation.
Characterization:
TEM: Low-mag.
Synthesis:
Disperse MWNTs (from ethylene CVD, as-produced) in 0.1M SnCl2/0.1M HCl by 30 min sonication; the "pre-activated" tubes were "further activated" in 0.0014M PdCl2/0.25M HCl for another 30 min; they were then placed in an electroless plating bath, consisting of a wealth of components including Ni source (See Table).
This method is very sensitive to pH (8.25, 8.5, and 8.75 were exercised): Reaction rate increases with pH value. Thus, low pH might be desirable for less particle aggregation.
Characterization:
TEM: Low-mag.
EDAX
Magnetization
- Vibrating sample magnetometer
- Found enhanced magnetic coercivity (1550 Oe) compared to bulk Ni.
Speculated Applications:
- Microscopic magnetism
- High-density magnetic recording
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