Size-controlled silver nanoparticles stabilized on thiol-functionalized MIL-53(Al) frameworks

Xinquan Cheng, Min Liu, Anfeng Zhang, Shen Hu, Chunshan Song, Guoliang Zhang, Xinwen Guo

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

A postsynthetic modification method was used to prepare thiol-functionalized metal-organic frameworks (MOFs) by the amidation of mercaptoacetic acid with the amine group, which is present in the frameworks of NH2-MIL-53(Al). By doing this, the thiol group has been successfully grafted on the MOF, which perfectly combined the highly developed pore structures of the MOF with the strong coordination ability of the thiol group. The resulting thiol-functionalized MIL-53(Al) showed a significantly high adsorption capacity for heavy metal ions like Ag+ (182.8 mg g-1). Even more importantly, these grafted thiol groups can be used as anchoring groups for stabilizing metal nanoparticles (NPs) with controllable sizes. Taking silver as an example, monodispersed Ag NPs encapsulated in the cages of MIL-53(Al) have been prepared by using a two-step procedure. In addition, the particle size of the Ag NPs was adjustable to some extent by controlling the initial loading amount. The average size of the smallest Ag NPs is 3.9 ± 0.9 nm, which is hard to obtain for Ag NPs because of their strong tendency to aggregate.

Original languageEnglish (US)
Pages (from-to)9738-9745
Number of pages8
JournalNanoscale
Volume7
Issue number21
DOIs
StatePublished - Jun 7 2015

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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