Nanoparticulate platinum films on gold using dendrimer-based wet chemical method

Raghu, S.; Berchmans, Sheela; Phani, K. L. N.; Yegnaraman, V.

doi:10.1007/bf02704081

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…Similarly, amine terminated Pt and Pd DENs have been immobilized on planar Au surfaces through self -assembled monolayer (SAM) chemistry [59,60] . Amine terminated dendrimers can also be deposited onto Au fi lms and then used to template Pt nanoparticles which are active electrocatalysts [61] .…”

Section: Electrocatalysis By Immobilized Intact Densmentioning

confidence: 99%

PAMAM Dendrimer Templated Nanoparticle Catalysts

Chandler

Gilbertson

2007

Nanoparticles and Catalysis

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Section: Electrocatalysis By Immobilized Intact Densmentioning

confidence: 99%

PAMAM Dendrimer Templated Nanoparticle Catalysts

Chandler

Gilbertson

2007

Nanoparticles and Catalysis

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“…Kim et al [26] have reported the preparation of platinum-dendrimer hybrid nanowires using alumina templates, which exhibited electrocatalytic properties. In a recent study [27], we have shown fourthgeneration amine-terminated PAMAM dendrimer to serve as adhesion agent to deposit nanoparticulate thin films of Pt on Au. These films exhibited significantly enhanced electrocatalytic activity towards methanol oxidation.…”

Section: Introductionmentioning

confidence: 99%

Platinum–Dendrimer Nanocomposite Films on Gold Surfaces for Electrocatalysis

et al. 2007

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In this communication, we report a strategy for the preparation of Pt nanoparticles encapsulated in Generation 4.5 (Polyamido amine) PAMAM dendrimer and subsequent chemical linking of the nanocomposite to the gold electrode through a self assembled cystamine monolayer. The modification resulted in the formation of a robust electrochemically active thin film with very high surface area, reflected by the enhanced hydrogen adsorption coverage. Interestingly, TEM images revealed selfassembly of Pt nanoparticles and the SAED (Selected Area Electron Diffraction) patterns showed the presence of Pt single crystals (111). The Pt-dendrimer nanocomposite film obtained using the novel modification procedure exhibited high electrocatalytic activity for the oxidation of organic fuels like methanol, ethanol and ethylene glycol. The film did not suffer from degradation even after repeated use in solution-phase voltammetry. It is however observed that the intermediate SAM layer and the bulky PAMAM dendrimer (generation 4.5) have slowed down the electron transfer kinetics which is reflected by a relatively high overpotential for methanol oxidation. Nevertheless this shortcoming is more than compensated by the existence of Pt(111) planes, which alleviate CO poisoning.

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“…We recently showed that dendrimer (PAMAM 4.5)encapsulated Pt nanoparticles chemically linked to gold substrates through a cystamine monolayer exhibited electrocatalytic activity towards the oxidation of small molecules such as methanol, ethanol, and ethylene glycol. [8] In a recent study, [24] we showed that a fourth-generation amine-terminated PAMAM dendrimer aids the formation of nanoparticulate thin films of platinum on gold. In this paper, we make use of the self-assembly of fourth-generation amineterminated PAMAM dendrimers (G4NH 2 ) on gold substrates as an anchor layer for the growth of platinum films, which exhibited very good catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

PAMAM Dendrimers as Anchors for the Preparation of Electrocatalytically Active Ultrathin Metallic Films

Raghu

Berchmans

Phani

et al. 2007

Chemistry An Asian Journal

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This paper describes the formation of catalytically active thin films of Pt, Pt/Au, and Pt/Ru on gold substrates stabilized by amine-terminated polyamidoamine (PAMAM) dendrimers. A monolayer of dendrimer is initially self-assembled on the gold substrate, which serves as a template for the growth of catalytically active thin films. As dendrimers contain tens to hundreds of functional groups at the periphery, the aggregate strength of the multidentate interactions with the gold substrate leads to the formation of robust films. The films were found to exhibit high catalytic activity for the oxidation of small hydrocarbons such as methanol. Such films offer versatility and scope for the design of effective electrocatalysts, especially in the context of microfuel cells and "dendrichips"; hence, they could find applications in the fields of sensors, fuel cells, and waste-water treatment.

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Nanoparticulate platinum films on gold using dendrimer-based wet chemical method

Cited by 4 publications

References 16 publications

PAMAM Dendrimer Templated Nanoparticle Catalysts

PAMAM Dendrimer Templated Nanoparticle Catalysts

Platinum–Dendrimer Nanocomposite Films on Gold Surfaces for Electrocatalysis

PAMAM Dendrimers as Anchors for the Preparation of Electrocatalytically Active Ultrathin Metallic Films

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