Background: Porous Au nanomaterials show great potential in the fields of
biomedicine, drug delivery, and catalysis for the merits of low density, large void space, and large
specific surface area. The preparation of porous Au nanomaterials is usually carried out by using a
hard-templating method, which is cumbersome.
Methods: Dandelion-like porous Au nanoparticles were synthesized through a soft-templating
method in our work. The synthesized porous Au nanoparticles were characterized via transmission
electron microscopy (TEM), X-ray diffraction (XRD), energy-dispersive X-ray (EDX), and cyclic
voltammetry (CV). The reduction of nitrophenol was carried out to evaluate the catalytic behavior
of porous Au nanoparticles.
Results: Porous Au nanoparticles prepared were in uniform size (47.9±6.4 nm) and the
morphology could be regulated by adjusting the molar ratio of reactants. The apparent rate constant
(kapp) value of reducing nitrophenol catalyzed by porous Au nanoparticles was higher than Au
nanospheres and nanobranches in a similar size. It could be attributed to a large amount of active
sites and high proportion of high-order crystal faces proved by CV and XRD.
Conclusion: We developed a facile and reproducible method for synthesizing porous Au
nanoparticles. The morphology of porous Au nanoparticles can be ajusted by changing the molar
ratio of reactants. Porous Au nanoparticles that we prepared behaved better in catalysis compared
with Au nanospheres and Au nanobranches.