One-pot fabrication of noble-metal nanoparticles that are encapsulated in hollow silica nanospheres: dual roles of poly(acrylic acid)

Chemistry : a European Journal
Xin DuJunhui He

Abstract

An efficient and facile one-pot method was developed to fabricate noble-metal nanoparticles (NMNs; Au, Pt, PdO and Ag) that were encapsulated within hollow silica nanospheres (HSNs; NMNs@HSNs) with a size of about 100 nm. NMNs@HSNs were afforded in very high yields between 85-95 %. Poly(acrylic acid) (PAA) polyelectrolyte played a dual role in the fabrication process, both as a core template of the HSNs and as a captor of the NMNs through coordination interactions between the COO(-) groups on the ammonium polyacrylate (APA) polyanionic chains and the empty orbital of the Au atom. The amount of Au loading in Au@HSNs was easily regulated by varying the volume of the HAuCl(4) solution added. In addition, these rattle-type particles were successfully applied in the catalytic reduction of 2-nitroaniline (2-NA) as a model reaction, thus indicating that the micropores in the silica shell could achieve the transport of small species--with a size smaller than that of the micropores--into the cavity. Thus, these fabricated NMNs@HSNs have promising applications in catalysis.

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Citations

Mar 4, 2017·Scientific Reports·D CassanoV Voliani
Mar 21, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Firdoz ShaikWenxin Niu
Nov 26, 2016·Chemistry : a European Journal·Yasutaka KuwaharaHiromi Yamashita
Jun 21, 2017·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Mengyun ZhouMeiqin Zhang
Nov 13, 2013·Chemical Communications : Chem Comm·Shunsheng CaoAnthony P F Turner
Jan 6, 2017·Environmental Science and Pollution Research International·Khalida NaseemZahoor H Farooqi
Jan 22, 2014·Langmuir : the ACS Journal of Surfaces and Colloids·Kathryn A Whitaker, Eric M Furst

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