Adsorption of Carbon Monoxide on Dendrimer-Encapsulated Platinum Nanoparticles: Liquid versus Gas Phase

Albiter, Manuel A.; Crooks, Richard M.; Zaera, Francisco

doi:10.1021/jz900037x

Cited by 52 publications

(56 citation statements)

References 28 publications

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“…93 It was found that in polar solvents CO adsorbed strongly and extensively to the DEN surface. However, dry DENs exhibited weaker adsorption and lower coverages of CO.…”

Section: 92mentioning

confidence: 99%

Dendrimer-encapsulated nanoparticles: New synthetic and characterization methods and catalytic applications

et al. 2011

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In this article we describe the synthesis, characterization, and applications of dendrimer-encapsulated nanoparticles (DENs). These materials are synthesized using a template approach in which metal ions are extracted into the interior of dendrimers and then subsequently reduced chemically to yield nearly size-monodisperse particles having diameters in the 1-2 nm range. Monometallic, bimetallic (alloy and core@shell), and semiconductor nanoparticles have been prepared by this route. The dendrimer component of these composites serves not only as a template for preparing the nanoparticle replica, but also as a stabilizer for the nanoparticle. In this perspective, we report on progress in the synthesis, characterization, and applications of these materials since our last review in 2005. Significant advances in the synthesis of core@shell DENs, characterization, and applications to homogeneous and heterogeneous catalysis (including electrocatalysis) are emphasized.

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“…93 It was found that in polar solvents CO adsorbed strongly and extensively to the DEN surface. However, dry DENs exhibited weaker adsorption and lower coverages of CO.…”

Section: 92mentioning

confidence: 99%

Dendrimer-encapsulated nanoparticles: New synthetic and characterization methods and catalytic applications

et al. 2011

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“…These properties also impact the catalytic reactivity of the nanoparticles [42]. A dendrimer templating strategy is very attractive for synthesis of small nanoparticles [43][44][45]. The size of metal nanoparticles synthesized within polyamidoamine (PA-MAM) dendrimers is controlled by the number of functional groups in the dendrimer and the structure of the dendrimer matrix (Fig.…”

Section: Dendrimer-templated Synthesis Of Small (*1 Nm) Metallic Nanomentioning

confidence: 99%

“…The dendrimer also provides a shell that prevents aggregation of the as-grown nanoparticles. By changing the metal ion to dendrimer concentrations ratio, a variety of monometallic and bimetallic nanoparticles in the size range of 1 nm were synthesized with narrow size distribution [43][44][45].…”

Section: Dendrimer-templated Synthesis Of Small (*1 Nm) Metallic Nanomentioning

confidence: 99%

Polymer-Encapsulated Metallic Nanoparticles as a Bridge Between Homogeneous and Heterogeneous Catalysis

2014

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Continuous efforts in catalysis research have been devoted towards the development of heterogeneous catalysts that can activate reactions which are catalyzed by homogeneous catalysts. Replacing homogeneous catalysts with their heterogeneous counterparts will enhance the sustainability of the catalytic system, providing a highly recyclable, scalable and efficient setup. Throughout this review we demonstrate that small (\2 nm), metallic nanoclusters can catalyze a wide range of p-bond activation reactions that were previously activated by homogeneous catalysts. The small size of the nanoparticles enables their reversible oxidation into catalytically active metal ions. Encapsulation of the metal within a polymeric matrix severely restricts leaching of the highly oxidized metal ions into the solution phase, inducing high catalytic stability and recyclability. Activation of complex, multistep organic transformations with heterogeneous catalysts provides novel opportunities, not accessible with homogeneous catalysts, to control and tune the products selectivity. By designing the molecular properties of the polymeric matrix that encapsulates the metal cluster, high products selectivity, diastereoselectivity and enantioselectivity can be gained. These results demonstrate the capability of mesoscale catalysts, constructed of metallic nanoparticles and an encapsulating layer, to activate a wide array of catalytic reactions with high reactivity and tunable selectivity.

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“…[301][302][303] However, it has been established that the use of different capping agents may result in different catalytic performances, [304][305][306] an observation that perhaps offers another possibility to tune selectivity. In liquid phase, the surfactants used in colloidal, micelle, dendrimer, and other self-assembly synthesis may be retained, and the catalysts may be used without the need for further treatment.…”

Section: Discussionmentioning

confidence: 99%

Shape‐Controlled Nanostructures in Heterogeneous Catalysis

2013

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Nanotechnologies have provided new methods for the preparation of nanomaterials with well-defined sizes and shapes, and many of those procedures have been recently implemented for applications in heterogeneous catalysis. The control of nanoparticle shape in particular offers the promise of a better definition of catalytic activity and selectivity through the optimization of the structure of the catalytic active site. This extension of new nanoparticle synthetic procedures to catalysis is in its early stages, but has shown some promising leads already. Here, we survey the major issues associated with this nanotechnology-catalysis synergy. First, we discuss new possibilities associated with distinguishing between the effects originating from nanoparticle size versus those originating from nanoparticle shape. Next, we survey the information available to date on the use of well-shaped metal and non-metal nanoparticles as active phases to control the surface atom ensembles that define the catalytic site in different catalytic applications. We follow with a brief review of the use of well-defined porous materials for the control of the shape of the space around that catalytic site. A specific example is provided to illustrate how new selective catalysts based on shape-defined nanoparticles can be designed from first principles by using fundamental mechanistic information on the reaction of interest obtained from surface-science experiments and quantum-mechanics calculations. Finally, we conclude with some thoughts on the state of the field in terms of the advances already made, the future potentials, and the possible limitations to be overcome.

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Adsorption of Carbon Monoxide on Dendrimer-Encapsulated Platinum Nanoparticles: Liquid versus Gas Phase

Cited by 52 publications

References 28 publications

Dendrimer-encapsulated nanoparticles: New synthetic and characterization methods and catalytic applications

Dendrimer-encapsulated nanoparticles: New synthetic and characterization methods and catalytic applications

Polymer-Encapsulated Metallic Nanoparticles as a Bridge Between Homogeneous and Heterogeneous Catalysis

Shape‐Controlled Nanostructures in Heterogeneous Catalysis

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