Catalytic Activity of Supported Au Nanoparticles Deposited from Block Copolymer Micelles

Jaramillo, Thomas F.; Baeck, Sung‐Hyeon; Cuenya, Beatriz Roldán; McFarland, Eric W.

doi:10.1021/ja029800v

Cited by 406 publications

(295 citation statements)

References 17 publications

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“…The micelles were then loaded with a metal salt (H 2 PtCl 6· 6H 2 O) to produce self-confined and size-selected Pt nanoparticles. The particle size can be tuned by using polymers with different head lengths and/or by changing the metal-salt/polymer head concentration in the solution [24][25][26]. The solution was then mixed with TiO 2 in the form of a powder and placed in a tubular furnace open to the air for calcination.…”

Section: Methodsmentioning

confidence: 99%

Size Dependent Study of MeOH Decomposition Over Size-selected Pt Nanoparticles Synthesized via Micelle Encapsulation

et al. 2007

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We present here the size-dependent decomposition of methanol (MeOH) over narrowly distributed Pt nanoparticles supported on nanocrystalline anatase TiO 2 powder. Micelle encapsulation has been used to create Pt catalysts with average particle sizes of ~ 4, 6, and 8 nm. A packed bed mass flow reactor and mass spectrometry were employed to quantify the catalyst's activity and selectivity. Among the catalysts tested the smallest nanoparticles showed the best performance including an onset reaction temperature of ~145 °C. No byproducts such as CO 2 or CH 4 were observed in the test range of 100 to 330 °C.

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Section: Methodsmentioning

confidence: 99%

Size Dependent Study of MeOH Decomposition Over Size-selected Pt Nanoparticles Synthesized via Micelle Encapsulation

et al. 2007

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“…Gold nanoparticles were grown onto ITO coated glass mainly though seed-mediated growth 21,24,25 or assembling with polymer. [26][27][28] Hitherto electrochemical deposition has never been used to fabricate gold nanoparticles on ITO film coated glass. Applications of gold nanoparticle modified ITO glass electrodes include the electrooxidation of nitric oxide, 21 the catalytic reduction of oxygen, 26 the reduction of H2O2 25,27 and the electrooxidation of CO. 28 Application of the gold nanoparticle modified ITO glass electrodes to the determination of metal ions has not been reported.…”

Section: Simm Et Almentioning

confidence: 99%

Direct Electrodeposition of Gold Nanoparticles onto Indium Tin Oxide Film Coated Glass: Application to the Detection of Arsenic(III)

2006

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“…The N 2 plasma treated film has not undergone complete reduction, however, and small peaks associated with non-reduced precursor crystals are evident at 34°, 66° and 78°. The reduction of metal precursor loaded block-copolymer micelles using oxygen plasma has been attributed to a mechanism of hydrocarbon oxidation, however no precise reduction mechanism was elaborated [28,34]. In our case, reduction only takes place using nitrogen or air plasma, and not pure oxygen.…”

Section: Ink Developmentmentioning

confidence: 70%

Nanoscale platinum printing on insulating substrates

O’Connell¹,

Higgins²,

Sullivan³

et al. 2013

Nanotechnology

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The deposition of noble metals on soft and/or flexible substrates is vital for several emerging applications including flexible electronics and the fabrication of soft bionic implants. In this paper, we describe a new strategy for the deposition of platinum electrodes on a range of materials, including insulators and flexible polymers. The strategy is enabled by two principle advances: (1) the introduction of a novel, low temperature strategy for reducing chloroplatinic acid to platinum using nitrogen plasma; (2) the development of a chloroplatinic acid based liquid ink formulation, utilizing ethylene glycol as both ink carrier and reducing agent, for versatile printing at nanoscale resolution using dip-pen nanolithography (DPN). The ink formulation has been printed and reduced upon Si, glass, ITO, Ge, PDMS, and Parylene C. The plasma treatment effects reduction of the precursor patterns in situ without subjecting the substrate to destructively high temperatures. Feature size is controlled via dwell time and degree of ink loading, and platinum features with 60 nm dimensions could be routinely achieved on Si. Reduction of the ink to platinum was confirmed by energy dispersive x-ray spectroscopy (EDS) elemental analysis and x-ray diffraction (XRD) measurements. Feature morphology was characterized by optical microscopy, SEM and AFM. The high electrochemical activity of individually printed Pt features was characterized using scanning electrochemical microscopy (SECM). Abstract. The deposition of noble metals on soft and/or flexible substrates is vital for several emerging applications including flexible electronics and the fabrication of soft bionic implants. In this article, we describe a new strategy for the deposition of platinum electrodes on a range of materials, including insulators and flexible polymers. The strategy is enabled by two principle advances: 1) the introduction of a novel, low-temperature strategy for reducing chloroplatinic acid to platinum using nitrogen plasma; 2) the development of a chloroplatinic acid based liquid ink formulation, utilising ethylene glycol as both ink carrier and reducing agent, for versatile printing at nanoscale resolution using dip-pen nanolithography (DPN). The ink formulation has been printed and reduced upon Si, glass, ITO, Ge, PDMS, and Parylene C. The plasma treatment effects reduction of the precursor patterns in situ without subjecting the substrate to destructively high temperatures. Feature size is controlled via dwell time and degree of ink loading, and platinum features with 60 nm dimensions could be routinely achieved on Si. Reduction of the ink to platinum was confirmed by Energy dispersive X-ray spectroscopy (EDS) elemental analysis and X-Ray Diffraction (XRD) measurements. Feature morphology was characterized by optical microscopy, SEM and AFM. The high electrochemical activity of individually printed Pt features was characterized using Scanning Electrochemical Microscopy (SECM).

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Catalytic Activity of Supported Au Nanoparticles Deposited from Block Copolymer Micelles

Cited by 406 publications

References 17 publications

Size Dependent Study of MeOH Decomposition Over Size-selected Pt Nanoparticles Synthesized via Micelle Encapsulation

Size Dependent Study of MeOH Decomposition Over Size-selected Pt Nanoparticles Synthesized via Micelle Encapsulation

Direct Electrodeposition of Gold Nanoparticles onto Indium Tin Oxide Film Coated Glass: Application to the Detection of Arsenic(III)

Nanoscale platinum printing on insulating substrates

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