Electron and ion transfer through multilayers of gold nanoclusters covered by self-assembled monolayers of alkylthiols with various functional groups

Uosaki, Kohei; Kondo, Toshihiro; Okamura, Misato; Song, Wenbo

doi:10.1039/b200397j

Cited by 47 publications

(68 citation statements)

References 69 publications

(51 reference statements)

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“…17 Uosaki et al have also demonstrated that fast electron transfer can take place from ferrocene groups covalently bound to the gold nanocrystals. 21 The trends observed in the voltammograms can be rationalised in further detail by the acimpedance spectra obtained at the formal redox potential of ferrocene. As shown in Fig.…”

Section: Electrochemical Properties Of the Nanocrystal Assemblymentioning

confidence: 99%

“…The electrochemical behaviour of Au assemblies has also been studied in connection to the dynamics of electron transfer 21,[26][27][28] and quantised double layer charging. [28][29][30][31][32] Recent works by the groups of Murray and Chen have provided clear evidence of stepwise charging of the double layer at Au clusters of less than 2 nm diameter at room temperature, which is a phenomenon comparable to the so-called coulomb staircase.…”

Section: Introductionmentioning

confidence: 99%

“…S-Au), [6][7][8][9][10][11] van der Waals forces involving the stabilisers at the particle surface, [12][13][14][15][16] and electrostatic forces. [17][18][19][20][21] Although tremendous efforts have been devoted to the characterisation of nanoparticle arrays obtained by different assembling methods, systematic studies of the size and nature of the nano-object, deposition time, particle-substrate distance and so forth are somewhat scarce. The present contribution delivers our initial efforts towards establishing detailed correlation between the organisation of the assembly and the optical and electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

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Electrochemical and optical properties of two dimensional electrostatic assembly of Au nanocrystals

et al. 2004

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The spectroscopic and electrochemical properties of two-dimensional electrostatic assembly of Au nanocrystals are examined on poly-L-lysine (pLys) modified gold electrodes. The surface preparation for the nanoparticle deposition involved the selfassembly of a monolayer of 11-mercaptoundecanoic acid on the electrode surface, followed by the electrostatic deposition of pLys from aqueous solution. The polyelectrolyte layer acts as the electrostatic anchor for the Au particles. Electrostatically stabilised Au particles were prepared by homogeneous reduction in the presence of citrate, yielding monodispersed colloidal suspension with an average diameter of 18 AE 2 nm. After 4 h of deposition, the citrate-stabilised particles reach a maximum surface density of (8.2 AE 0.1) Â 10 10 particles cm À2 , with an average edge-to-edge distance of 25 nm. The particle surface density was estimated from scanning electron micrographs. Kelvin probe measurements were employed for examining changes in surface dipole introduced by the 2D array of nanocrystals. From simple electrostatic arguments, the apparent static dipole moment per particle was estimated of the order of 2700 D. The strong interaction between the nanocrystals and the pLys layer is responsible for the surface charge displacement, leading to changes in the surface dipole of 0.35 eV. These electrostatic interactions also manifest itself by the red shift of the plasmon resonance of the assembly with respect to the aqueous colloidal suspension. Analysis of the spectral broadening was attempted within the framework of the so-called coherent-potential approximation. Finally, electrochemical studies in 1,2-dichloroethane show a large electronic overlap between the nanocrystals and the metal substrate. Results obtained from electrochemical impedance spectroscopy strongly suggest that the electrostatic assembly of nanocrystal behaves like a 2D array of randomly distributed spherical nanoelectrodes.

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Section: Electrochemical Properties Of the Nanocrystal Assemblymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrochemical and optical properties of two dimensional electrostatic assembly of Au nanocrystals

et al. 2004

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“…GNCs modified with the mixed SAMs of MUA, C 6 SH, and FcC 6 SH were prepared by the methods previously reported [16][17][18][19]21]. Multilayers of GNCs were prepared on a commercially available Au(111) substrate, which was annealed and quenched prior to use, by repeating the two-step dip and rinse cycles for 10 times based on the carboxylate/poly(allylamine hydrochloride) (PAH)/carboxylate electrostatic interaction [16][17][18][19][21][22][23].…”

Section: Methodsmentioning

confidence: 99%

“…Previously, we succeeded [16][17][18][19][20][21][22][23][24] to synthesize gold nanoclusters (GNCs), of which surface was covered with the mixed self-assembled monolayers (SAMs) of mercaptoundecanoic acid (MUA), 3 hexanethiol (C 6 SH), and ferrocenylhexanethiol (FcC 6 SH), using the methods by Brust et al [25] and Hostetler et al [26] and to construct the multilayers of GNCs on the solid surface, using the cation/anion electrostatic interaction [27][28][29][30][31]. When the potential was made more positive than that for the oxidative decomposition of the thiol SAM on gold [32][33][34][35], the SAM was gradually removed from the GNCs and GNCs started to aggregate [22,23].…”

Section: Introductionmentioning

confidence: 99%

Size dependent lattice constant change of thiol self-assembled monolayer modified Au nanoclusters studied by grazing incidence x-ray diffraction

Kondo

Masuda

Harada

et al. 2016

Electrochemistry Communications

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Size and lattice constant of thiol self-assembled monolayer (SAM)-modified gold nanoclusters (GNCs) assembled on Au(111) surfaces after each electrochemical treatment were investigated using grazing incidence x-ray diffraction (GIXRD). When the potential was swept between 0 and 1.3 V (vs.Ag/AgCl), the size and lattice constant of GNCs slightly decreased due to the oxidative desorption of the SAMs. As the number of potential cycles increased, the size of GNCs started to increase due to the aggregation, while the lattice constant continued to decrease due to further desorption of the SAMs from the GNCs. After most of the SAMs were removed from the GNCs, the size and lattice constant monotonically increased with the number of potential cycles. The size dependent lattice constant change was observed when GNCs were smaller than ~35Å.

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Photoelectrochemical Properties of Electrodes Modified with Self‐assembled Monolayers ( SAMs ) of Various Alkylthiol Derivatives

Kondo

Uosaki

2007

Encyclopedia of Electrochemistry

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The sections in this article are Introduction Photo‐induced Electron Transfer at SAM ‐modified Electrodes Photo‐induced Electron Transfer at Electrodes Modified with SAM ‐covered Nanocluster Layers Electron Transfer Controlled by Photoisomerization at SAM ‐modified Electrodes Application of Luminescence from SAM ‐modified Electrodes Concluding Remarks

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Electron and ion transfer through multilayers of gold nanoclusters covered by self-assembled monolayers of alkylthiols with various functional groups

Cited by 47 publications

References 69 publications

Electrochemical and optical properties of two dimensional electrostatic assembly of Au nanocrystals

Electrochemical and optical properties of two dimensional electrostatic assembly of Au nanocrystals

Size dependent lattice constant change of thiol self-assembled monolayer modified Au nanoclusters studied by grazing incidence x-ray diffraction

Photoelectrochemical Properties of Electrodes Modified with Self‐assembled Monolayers ( SAMs ) of Various Alkylthiol Derivatives

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