Pore-Engineered Silica Nanoreactors for Chemical Interaction-Guided Confined Synthesis of Porous Platinum Nanodendrites

Abstract

Designing and synthesizing noble metal nanostructures with tunable porosity and nanoscopic intricacies is crucial for highly augmented surface properties and as gateway to the wide range of applications. Here, we develop a pore-engineered nanoreactor (PENR)-based approach toward the synthesis of porous platinum nanodendrites (PtNDs) of “yolk-in-shell” and “shell-in-shell” morphologies and with tunable nanoscale porosity. In our strategy, first, various silica-based PENRs with variable porosity and each containing a single Au seed were synthesized by a successive base-catalyzed condensation reaction of a mixture of aminoalkyl-organosilanes in a one-pot reverse-microemulsion strategy, followed by selective silica hydrolysis reactions. The key strategy involved the addition of different silanes at different stages of silica condensation, rendering appropriately located fragile and rigid silica regions in silica nanospheres, which were conveniently carved into a “termite-nest” like structure with amine-rich n...