Bottom-Up Assembly of Ni<sub>2</sub>P Nanoparticles
into Three-Dimensional Architectures: An Alternative Mechanism for
Phosphide Gelation
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Abstract
The
synthesis of Ni<sub>2</sub>P nanoparticle three-dimensional
architectures using two different approaches is reported. The oxidation-induced
sol–gel method involves chemical oxidation of surface phosphorus
to form P–O–P linkages between particles in the gel
network, similar to the mechanism originally reported for InP nanoparticles.
The second method, metal-assisted gelation, occurs by cross-linking
of pendant carboxylate functionalities on surface-bound thiolate ligands
via metal ions to yield an interconnected particle network. The method
of gel network formation can be tuned by changing the surface ligand
terminal functionalities and the nature (oxygen-transferring or non-oxygen-transferring)
of the oxidant. Both methods produce porous, high surface area materials
with thermal stabilities above 400 °C
