Electrochemical Surface Structuring with Palladium Nanoparticles for Signal Enhancement

Soreta, Tesfaye Refera; Strutwolf, Jörg; Henry, Olivier; O’Sullivan, Ciara K.

doi:10.1021/la101398g

Cited by 28 publications

(20 citation statements)

References 57 publications

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“…Obvious peak at ¡0.3 V corresponding to HER was observed, similar to that of Pt electrode in H 2 SO 4 solution. Peaks corresponding to oxidation/reduction of Pd NPs were also seen in the CV curve of Pd NPs modified electrode in H 2 SO 4 solution, similar to the results reported elsewhere [30]. Thus, the electrochemical properties discuss above confirms the successfully anchoring noble metal NPs on the thiol modified electrode.…”

Section: Anchoring Metal Nanoparticles By Thiol Sam Templatesupporting

confidence: 88%

A facile method to prepare noble metal nanoparticles modified Self-Assembly (SAM) electrode

Liu

Huang

Duan

et al. 2017

Journal of Experimental Nanoscience

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Noble metal nanoparticles (NPs) modified electrodes have shown promising applications in the areas of catalysis, (electro)chemical analysis and biosensing due to their unique characters. In this paper, we introduced a so-called ligand exchange method to prepare self-assembly (SAM) electrode modified with noble metal nanoparticles. The noble metal nanoparticles protected by weakly adsorbed tetraoctylammonium bromide (TOAB) were synthesized firstly, then self-assembly (SAM) dithiol-modified Au electrode (Au-SH SAM ) was immersed into the solutions containing TOAB-protected nanoparticles. Due to the strong interaction between the dithiol groups on the electrode and noble metal nanoparticles, the weakly adsorbed TOAB on the surface of noble metal NPs were replaced by dithiol groups. As a result, the TOAB protected NPs were anchored on the Au-SH SAM template electrode surface by ligand exchange, obtaining noble metal NPs modified electrode with high quality and stability. By adjusting the soaking time, the coverage of nanoparticles on the Au-SH SAM electrode surface could be controlled. The morphology and distribution of noble metal NPs on Au-SH SAM surface was analysis by scanning tunneling microscope (STM), and their electrochemical property was studied by cyclic voltammetry (CV) in H 2 SO 4 solution. The approach is proved as a universal way to prepare noble metal NPs modified SAM electrode.

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Section: Anchoring Metal Nanoparticles By Thiol Sam Templatesupporting

confidence: 88%

A facile method to prepare noble metal nanoparticles modified Self-Assembly (SAM) electrode

Liu

Huang

Duan

et al. 2017

Journal of Experimental Nanoscience

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show abstract

“…1-3 This is due to their vast potential applications in disciplines expanding from electronics, 4,5 optics, 3 sensors, 6-8 and chemical catalysis. 2,9-11 It has been well documented that metal nanoparticles have novel chemical and physical properties compared to those of their bulk counterparts.…”

Section: Introductionmentioning

confidence: 99%

Water-Soluble Pd Nanoparticles Synthesized from ω-Carboxyl-S-Alkanethiosulfate Ligand Precursors as Unimolecular Micelle Catalysts

Gavia

Maung

Shon

2013

ACS Appl. Mater. Interfaces

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This report describes a two-phase synthesis of water-soluble carboxylate-functionalized alkanethiolate-capped Pd nanoparticles from ω-carboxyl-S-alkanethiosulfate sodium salts. The two-phase methodology using the thiosulfate ligand passivation protocol allowed a highly specific control over the surface ligand coverage of these nanoparticles, which are lost in a one-phase aqueous system because of the base-catalyzed hydrolysis of thiosulfate to thiolate. Systematic synthetic variations investigated in this study included the concentration of ω-carboxyl-S-alkanethiosulfate ligand precursors and reducing agent, NaBH4, and the overall ligand chain length. The resulting water-soluble Pd nanoparticles were isolated and characterized by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), 1H NMR, UV–vis, and FT-IR spectroscopy. Among different variations, a decrease in the molar equivalent of NaBH4 resulted in a reduction in the surface ligand density while maintaining a similar particle core size. Additionally, reducing the chain length of the thiosulfate ligand precursor also led to the formation of stable nanoparticles with a lower surface coverage. Since the metal core size of these Pd nanoparticle variations remained quite consistent, direct correlation studies between ligand properties and catalytic activities against hydrogenation/isomerization of allyl alcohol could be performed. Briefly, Pd nanoparticles dissolved in water favored the hydrogenation of allyl alcohol to 1-propanol whereas Pd nanoparticles heterogeneously dispersed in chloroform exhibited a rather high selectivity towards the isomerization product (propanal). The results suggested that the surrounding ligand environments, such as the ligand structure, conformation, and surface coverage, were crucial in determining the overall activity and selectivity of the Pd nanoparticle catalysts.

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“…PdCl 2 was used as the precursor for Pd deposition, as it is the only electro-active species undergoing an overall two electron irreversible reduction to metal among the various Pdchloro complexes [33,34]. Moreover, potential cycling technique was employed for the Pd deposition, as it is an alternating redox process, involving both deposition and dissolution, which could be critical to the formation of Pd nanostructures [18,35].…”

Section: Resultsmentioning

confidence: 99%

Electrochemical synthesis of palladium dendrites on carbon support and their enhanced electrocatalytic activity towards formic acid oxidation

Maniam

Chetty

2015

J Appl Electrochem

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Palladium (Pd) dendrites on carbon black support were synthesized by a simple template/surfactant-free electrochemical deposition. In comparison to Pd spherical deposit obtained on non-activated carbon, Pd deposited on an electrochemically activated carbon displayed a dendritic morphology with increased electrochemical surface area and showed enhanced catalytic activity for formic acid oxidation. The effect of electrochemical activation and deposition cycles were studied in relation to the growth and morphological features of Pd deposit. Scanning electron micrographs and X-ray diffraction studies showed a transition in Pd morphology from spheres to dendrites when the carbon support was subjected to varying cycles of electrochemical activation, prior to Pd deposition. Raman and X-ray photoelectron spectra results showed that the defects induced during electrochemical activation on carbon played a major role in tailoring the Pd morphology.

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Electrochemical Surface Structuring with Palladium Nanoparticles for Signal Enhancement

Cited by 28 publications

References 57 publications

A facile method to prepare noble metal nanoparticles modified Self-Assembly (SAM) electrode

A facile method to prepare noble metal nanoparticles modified Self-Assembly (SAM) electrode

Water-Soluble Pd Nanoparticles Synthesized from ω-Carboxyl-S-Alkanethiosulfate Ligand Precursors as Unimolecular Micelle Catalysts

Electrochemical synthesis of palladium dendrites on carbon support and their enhanced electrocatalytic activity towards formic acid oxidation

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