Moreover, these nanoporous active metals can be easily
modified to fabricate new functional composites for various applications.
However, when dealloying active metal-based precursors,
the dealloying process may involve the dissolution of both the two
elements simultaneously such as dealloying Ni–Mn alloy [129].
Thus, the dealloying conditions such as dealloying solutions, temperature
and time, should be more precisely controlled compared
with those for dealloying noble metal-based precursors. Also, since
the nanoporous active metals are not stable in air (eg., np-Ni will
self-burn if dried in air), they are better to be handled in vacuum
or water to inhibit the oxidation for certain applications. On the
other hand, stabilizing the microstructure of nanoporous metals
is crucial for their applications in catalyst, sensing, etc., especially
for these metals with fast diffusivities (such as Cu and Ag).
Although the deposition of metal oxides by ALD on np-Au surface
was demonstrated to be very effective for this purpose [91], the
fabrication process is still complicated.
Moreover, these nanoporous active metals can be easilymodified to fabricate new functional composites for various applications.However, when dealloying active metal-based precursors,the dealloying process may involve the dissolution of both the twoelements simultaneously such as dealloying Ni–Mn alloy [129].Thus, the dealloying conditions such as dealloying solutions, temperatureand time, should be more precisely controlled comparedwith those for dealloying noble metal-based precursors. Also, sincethe nanoporous active metals are not stable in air (eg., np-Ni willself-burn if dried in air), they are better to be handled in vacuumor water to inhibit the oxidation for certain applications. On theother hand, stabilizing the microstructure of nanoporous metalsis crucial for their applications in catalyst, sensing, etc., especiallyfor these metals with fast diffusivities (such as Cu and Ag).Although the deposition of metal oxides by ALD on np-Au surfacewas demonstrated to be very effective for this purpose [91], thefabrication process is still complicated.
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