Gold@Polymer Nanostructures with Tunable Permeability Shells for Selective Catalysis

Yuan, Conghui; Luo, Weiang; Zhong, Lina; Deng, Hujun; Liu, Jie; Xu, Yiting; Dai, Lizong

doi:10.1002/anie.201007077

Cited by 66 publications

(44 citation statements)

References 46 publications

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“…[319][320][321] When responsive or amphiphilic polymers are attached onto gold nanocrystals, the resultant composites show stimulus properties in response to changes of pH, 322, 323 ionic strength, 35 temperature, 23,36,312,313,322,[324][325][326] or solvent. 316,327,328 Interestingly, a protective polymer layer with tunable permeability can also trap and release target molecules, which was applied for selective catalysis 329,330 and showed a reversible SERS effect. 331 Many approaches have been studied to fabricate gold/polymer core/shell nanocomposites which can be roughly categorized as grafting-to, in situ sol-gel process, grafting-through, and grafting-from.…”

Section: Gold Nanocrystalsmentioning

confidence: 99%

Surface-initiated controlled radical polymerizations from silica nanoparticles, gold nanocrystals, and bionanoparticles

2015

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In recent years, core/shell nanohybrids containing a nanoparticle core and a distinct surrounding shell of polymer brushes have received extensive attention in nanoelectronics, nanophotonics, catalysis, nanopatterning, drug delivery, biosensing, and many others. From the large variety of existing polymerization methods on the one hand and strategies for grafting onto nanoparticle surfaces on the other hand, the combination of grafting-from with controlled radical polymerization (CRP) techniques has turned out to be the best suited for synthesizing these well-defined core/shell nanohybrids and is known as surface-initiated CRP. Most common among these are surface-initiated atom transfer radical polymerization (ATRP), surface-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization, and surface-initiated nitroxide-mediated polymerization (NMP). This review highlights the state of the art of growing polymers from nanoparticles using surface-initiated CRP techniques. We focus on mechanistic aspects, synthetic procedures, and the formation of complex architectures as well as novel properties. From the vast number of examples of nanoparticle/polymer hybrids formed by surface-initiated CRP techniques, we present nanohybrid formation from the particularly important and most studied silica nanoparticles, gold nanocrystals, and proteins which can be regarded as bionanoparticles

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Section: Gold Nanocrystalsmentioning

confidence: 99%

Surface-initiated controlled radical polymerizations from silica nanoparticles, gold nanocrystals, and bionanoparticles

2015

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“…The catalytic reduction of nitrobenzene (NB) by NaBH 4 has been also applied as model reaction to test the catalytic activity of metal nanocomposite particles [64]. Here Au-PNIPA yolk-shell particles, that is, a single Au nanoparticle is encapsulated in a hollow thermosensitive PNIPA shell, have been used as catalyst as shown in Fig.…”

Section: Catalytic Activity For Reduction Of Nitrobenzenementioning

confidence: 99%

Core-Shell Microgels as Nanoreactors

Lü

Welsch

Dzubiella

et al. 2013

Intelligent Hydrogels

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Core-shell microgel particles consisting of a solid core and a shell of crosslinked PNIPA network present model systems of high interest. Here we review our recent work on the core-shell microgel particles and their application as nanoreactors for the immobilization of catalytic active metal nanoparticles or enzymes. The catalytic activity of nanoparticles can be modulated both by the volume transition and the change of polarity of the thermosensitive shell of the carrier system. Special emphasis is put on recent work on the kinetic analysis of protein adsorption onto microgel particles, which was complemented with the thermodynamic study done by ITC. All results herein demonstrate that core-shell microgel particles may serve as "active" nanoreactor for catalytically active nanostructures, namely for metal nanoparticles and enzymes.

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“…25,26 Fig. 3 shows the typical change of UV-vis absorption of the reaction mixture when catalyzed by the Au/C thin sheets prepared by calcination at 600 o C. The original aqueous 4-nitrophenol solution was yellow and showed characteristic absorption at the wavelength of 317 nm.…”

Section: Please Do Not Adjust Marginsmentioning

confidence: 99%

Stabilization of ultrafine metal nanocatalysts on thin carbon sheets

et al. 2015

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A novel strategy was proposed to anchor ultrafine metal nanoparticles (NPs) on thin carbon sheets for highly stable and efficient heterogeneous catalysts. In this facile approach, a dense monolayer of ultrafine AuNPs was sandwiched between a silica core and a resin shell, followed by carbonization of the shell at a high temperature and then selective removal of the silica core. The shrinkage of the shells during carbonization facilitates partial embedment of the AuNPs on the carbon shell surface and provides superior stability against particle sintering during high temperature/mechanical post-treatments and catalytic reactions. It was also found that diffusion of reactants to the surface of AuNPs could be maximized by reducing the thickness of the hollow shells or simply by cracking the shells into thin carbon sheets, both significantly benefiting the catalytic efficiency. The advantages of this ultra-stable architecture together with the densely dispersed catalytic sites were demonstrated by their high stability and superior catalytic activity in reducing hydrophilic 4-nitrophenol and hydrophobic nitrobenzene.

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Gold@Polymer Nanostructures with Tunable Permeability Shells for Selective Catalysis

Abstract: A heart of gold: Au@polymer nanostructures with hydrophobic mesoporous shells show tunable permeability and Au cores with adjustable diameters. This nanocomposite exhibits selective catalytic activity for hydrophobic molecules.

Cited by 66 publications

References 46 publications

Surface-initiated controlled radical polymerizations from silica nanoparticles, gold nanocrystals, and bionanoparticles

Surface-initiated controlled radical polymerizations from silica nanoparticles, gold nanocrystals, and bionanoparticles

Core-Shell Microgels as Nanoreactors

Stabilization of ultrafine metal nanocatalysts on thin carbon sheets

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