The monolithic property of most nanoporous metals facilitates
their applications in energy storage, sensing, actuation, etc.; however,
for some specific applications such as labeling in immunosensing,
nanomedicine and drug delivery, uniform nanoporous
nanoparticles are more suitable. Moreover, compared with solid
nanoparticles, nanoporous nanoparticles with tunable SPR property,
lower density and higher surface area are clearly more advantageous
for these applications. However, it is noted that compared
with monolithic nanoporous metals, much less reports about
nanoporous nanoparticles are available if we exclude the galvanic
replacement strategy using Ag nanostructures as templates.