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An inorganic capping strategy for the seeded growth of versatile bimetallic nanostructures

TitleAn inorganic capping strategy for the seeded growth of versatile bimetallic nanostructures
Publication TypeJournal Article
Year of Publication2015
AuthorsPei, YC, Maligal-Ganesh, RV, Xiao, CX, Goh, TW, Brashler, K, Gustafson, JA, Huang, WK
JournalNanoscale
Volume7
Pagination16721-16728
Date Published10
Type of ArticleArticle
ISBN Number2040-3364
Accession NumberWOS:000362662100023
Keywordsatomic-resolution, catalytic-properties, core-shell nanoparticles, gold nanoparticles, hydrogenation, nanoparticles, oxidation, oxygen, platinum, pt-pd, reduction, silica shell
Abstract

Metal nanostructures have attracted great attention in various fields due to their tunable properties through precisely tailored sizes, compositions and structures. Using mesoporous silica (mSiO(2)) as the inorganic capping agent and encapsulated Pt nanoparticles as the seeds, we developed a robust seeded growth method to prepare uniform bimetallic nanoparticles encapsulated in mesoporous silica shells (PtM@mSiO(2), M = Pd, Rh, Ni and Cu). Unexpectedly, we found that the inorganic silica shell is able to accommodate an eight-fold volume increase in the metallic core by reducing its thickness. The bimetallic nanoparticles encapsulated in mesoporous silica shells showed enhanced catalytic properties and thermal stabilities compared with those prepared with organic capping agents. This inorganic capping strategy could find a broad application in the synthesis of versatile bimetallic nanostructures with exceptional structural control and enhanced catalytic properties.

DOI10.1039/c5nr04614a
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