Short-time preparation and electrochemical properties of a single layer of tetraoctylammonium bromide capped Au nanoparticles on dithiol self-assembled monolayer-modified Au electrode

John, S. Abraham; Sagara, Takamasa

doi:10.1016/j.jelechem.2009.05.009

Journal of Electroanalytical Chemistry

2009

DOI: 10.1016/j.jelechem.2009.05.009

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Short-time preparation and electrochemical properties of a single layer of tetraoctylammonium bromide capped Au nanoparticles on dithiol self-assembled monolayer-modified Au electrode

S. Abraham John

Takamasa Sagara

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Cited by 10 publications

(1 citation statement)

References 42 publications

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“…1 The inherent characteristics of biomolecules including self-assembly and molecular recognition have made these attractive for applications to bioelectronics. [2][3][4][5][6] The bio electronic devices deal with the integration of (bio) molecular materials with solid-state devices, including the use of (bio) molecular materials as components. Using SAMs to functionalize noble metal surfaces provides a simple route to functionalize electrode surfaces by organic molecules (both aliphatic and aromatic) containing free anchor groups such as thiols, disulfides, amines, acids or silanes for improved stability of biomolecules.…”

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A Highly Sensitive Nanostructure-Based Surface Covalently Modification of Gold for Electrochemical Sensing of Epinephrine in Presence of Uric Acid and Acetaminophen

Moghadam

Ghoreishi

Behpour

et al. 2012

J. Electrochem. Soc.

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In the present paper, the use of a gold electrode modified by 2-hydroxy-N′1-[(E)-1-(3-methyl-2-thienyl) methylidene] benzohydrazide self assembled monolayer (TMBH) for the determination of Epinephrine (Epi) in the presence of Uric acid (UA) and Acetaminophen (ACOP) was described. Initially, the formation of the TMBH at the surface of gold electrode investigated by electrochemical methods. At the optimum pH of 6.0, the oxidation of Epi occurs at a potential about 28 mV less positive than that of an unmodified gold electrode. The values of electron transfer coefficients (α = 0.55), catalytic rate constant (k = 1.2 × 10−2 M−1 s−1) and diffusion coefficient (D = 3.6 × 10−6 cm2 s−1) were calculated for Epi, using electrochemical approaches. Based on hydrodynamic differential pulse amprometry, the oxidation of Epi exhibited a dynamic range between 3.0 and 100.0 μM and a detection limit (3σ) of 0.08 μM. Furthermore, simultaneous determination of Epi and UA or ACOP at the modified electrode was described. The Au-TMBH SAM-modified electrode was shown agreeable recoveries in two types of serum; healthy and disease human blood serum.

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confidence: 99%

A Highly Sensitive Nanostructure-Based Surface Covalently Modification of Gold for Electrochemical Sensing of Epinephrine in Presence of Uric Acid and Acetaminophen

Moghadam

Ghoreishi

Behpour

et al. 2012

J. Electrochem. Soc.

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Covalent versus Electrostatic Strategies for Nanoparticle Immobilisation

et al. 2010

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We demonstrate that in neutral electrolytes, a polyelectrolyte-based (w-mercaptoacid/poly-l-lysine) immobilisation strategy for as-prepared electrostatically stabilised metal nanoparticles is a powerful alternative to often difficult to control dithiol approaches. Our data confirm straightforward preparation of high-coverage nanoparticle electrodes with fast kinetics and an electrochemical window of up to 1.5 V even in unbuffered solutions, under both stationary and hydrodynamic conditions. The stability region is limited by reductive desorption of the mercaptocarboxylic acid at negative potentials, and by nanoparticle oxidation at positive potentials. The electrostatic immobilisation is valuable for the study of electroanalytical and electrocatalytic processes using nanoparticulate electrode materials.

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A survey of place-exchange reaction for the preparation of water-soluble gold nanoparticles

Briñas

Maetani

Barchi

2013

Journal of Colloid and Interface Science

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Water-soluble gold nanoparticles (AuNPs) have gained considerable attention because they offer a myriad of potential applications, especially in the fields of biology and medicine. One method to prepare such gold nanoparticles is through the well-known Murray place-exchange reaction. In this method, precursor gold nanoparticles, bearing labile ligands and with very good size distribution, are synthesized first, and then reacted with a large excess of the desired ligand. We report a comparison of the reactivity of several known precursor gold nanoparticles (citrate-stabilized, pentanethiol-stabilized, tetraoctylammonium bromide-stabilized, and 4-dimethylaminopyridine-stabilized) to several biologically relevant ligands, including amino acids, peptides, and carbohydrates. We found that citrate-stabilized and 4-dimethylaminopyridine-stabilized gold nanoparticles have broader reactivities than the other precursors studied. Citrate-stabilized gold nanoparticles are more versatile precursors because they can be prepared in a wide range of sizes and are very stable. The hydrophobic pentane-stabilized gold nanoparticles made them “inert” toward highly water-soluble ligands. Tetraoctylammonium bromide-stabilized gold nanoparticles exhibited selective reactivity, especially for small, unhindered and amphiphilic ligands. Depending on the desired ligand and size of AuNPs, a judicious selection of the available precursors can be made for use in place-exchange reactions. In preparing water-soluble AuNPs with biologically relevant ligands, the nature of the incoming ligand and the size of the AuNP should be taken into account in order to choose the most suitable place-exchange procedure.

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Short-time preparation and electrochemical properties of a single layer of tetraoctylammonium bromide capped Au nanoparticles on dithiol self-assembled monolayer-modified Au electrode

Cited by 10 publications

References 42 publications

A Highly Sensitive Nanostructure-Based Surface Covalently Modification of Gold for Electrochemical Sensing of Epinephrine in Presence of Uric Acid and Acetaminophen

A Highly Sensitive Nanostructure-Based Surface Covalently Modification of Gold for Electrochemical Sensing of Epinephrine in Presence of Uric Acid and Acetaminophen

Covalent versus Electrostatic Strategies for Nanoparticle Immobilisation

A survey of place-exchange reaction for the preparation of water-soluble gold nanoparticles

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