Charging effects in gold nanoclusters grown on octanedithiol layers

Ohgi, Taizo; Sheng, Hanyu; Dong, Z.-C.; Nejoh, H.; Fujita, Daisuke

doi:10.1063/1.1409585

Cited by 74 publications

(80 citation statements)

References 8 publications

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“…2,3,[5][6][7] In contrast, when they are deposited on an alkanedithiol SAM with a thiol end group pointing up, metal nanoparticles are formed on top of the SAM. 1,2,4,8 This is due to the strong interaction between deposited metal nanoparticles and thiol end groups, which reduces the possibility of diffusion of deposited metal nanoparticles into the SAM. Dithiol SAMs are also used for attracting and fixing the metal nanoparticles on the surface from a solution.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Metal Deposition on Top of an Organic Monolayer

Uosaki

2006

J. Phys. Chem. B

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Electrochemical deposition of metals (platinum or gold) only on top of an organothiolate, 1,4-benzenedimethanethiol (BDMT) or hexanedithiol (HDT), self-assembled monolayer (SAM) on a Au(111) substrate was achieved by electrochemical reduction of PtCl 4 2-or AuCl 4 -ion, which was preadsorbed on one free thiol end group of the dithiol SAM formed on a Au surface, in a metal-ion-free sulfuric acid solution at potentials more negative than the reduction potential of the metal ion. Angle-resolved X-ray photoelectron spectroscopy (AR-XPS) measurement after the reduction of preadsorbed PtCl 4 2-ion on BDMT/Au(111) electrode showed the presence of Pt not underneath but on top of the BDMT SAM. After a negative potential scan of the Pt/BDMT/Au(111) electrode to -1.30 V in 0.1 M KOH solution, a typical cyclic voltammogram of a clean Au(111) electrode was obtained, showing that the BDMT SAM with a Pt layer was reductively desorbed. These results proved that a Pt-BDMT SAM-Au substrate sandwich structure without a short circuit between the two metals was successfully constructed by this technique. Furthermore, a decanethiol (DT) monolayer was constructed on a Au layer, which was formed by the reduction of preadsorbed AuCl 4 -ion on HDT/Au(111) electrode. The formation of DT/Au/HDT/Au(111) structure was confirmed as two cathodic peaks corresponding to reductive desorption of DT from Au on top of the HDT/Au(111) at -0.97 V and that of Au/ HDT from Au(111) at -1.12 V were observed when potential was scanned negatively to -1.35 V.

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Section: Introductionmentioning

confidence: 99%

Electrochemical Metal Deposition on Top of an Organic Monolayer

Uosaki

2006

J. Phys. Chem. B

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“…Hence, the electrostatic energy of a cluster changes dramatically upon the charge transfer. Without the application of a sufficient bias voltage, electron transfer is suppressed (Coulomb blockade) [13]. This effect is predominantly observed with a near-zero bias voltage.…”

Section: Resultsmentioning

confidence: 99%

n-Alkane Monolayer on a Au(111) Template for Metal Growth

Endō

Ozaki

Nakamura

et al. 2015

e-J. Surf. Sci. Nanotech.

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The growth of gold on top of a n-alkane monolayer, which consists of lamellar assemblies with close-packed flat-lying chains, is observed by using scanning tunneling microscopy. The n-alkane monolayer sustains gold atoms, and penetration of the atoms into the monolayer is inhibited. The molecular conformation is unaffected and the arrangement is only slightly changed upon deposition of the gold atoms. Two-dimensional clusters are grown and a smooth monolayer is finally obtained.

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“…Dithiol SAMs have been utilized to make nanodevices, for measurements of electricity transport, and for multilayer formation. [4][5][6][7][14][15][16][17]22,23,25,[30][31][32][33][34][35][36][37][38][39][40] So far, most studies have focused on their use either as a linker for metal nanoparticles to study charge transfer or as a spacer for multilayer formation. Compared to the well-studied monothiolate SAMs, not many reports have focused on the growth and structure of dithiol SAMs, and disagreements exist among the literature reported concerning the preparation of dithiol SAMs, the resulting structures, and the quality of dithiol SAMs.…”

Section: Introductionmentioning

confidence: 99%

“…Scoles et al carefully studied monolayers of HSC 6 SH on Au(111) single-crystal substrates by means of several surface science techniques in vacuum, and reported that the molecules lay prone in a striped arrangement with an inter-row spacing of 5 Å from the gas phase and that no evidence of nucleation of other ordered phases was found in different growth protocols, including liquid-phase deposition of 4-16 h in a millimolar ethanolic solution. 41 The results were then explained by the strong molecule/substrate interaction in the striped phases, which was interpreted as a consequence of the strong, but, not sitespecific, interaction of both sulfurs with the gold surface.…”

Section: Introductionmentioning

confidence: 99%

“…41 Recently, the same group asserted the importance of the problem again. 42 On the other hand, Bard et al used HSC 6 SH as a linker to construct a copper(I)-dithiol multilayer thin film, which was evidenced by ellipsometric, X-ray photoelectron and fluorescence spectroscopic, and electrochemical techniques. 30 HSC 6 SH was also used for the preparation of CdS nanoparticle-dithiol multilayer by one of us 33,34 and Alivisatos.…”

Section: Introductionmentioning

confidence: 99%

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1,6-Hexanedithiol Self-Assembled Monolayers on Au(111) Investigated by Electrochemical, Spectroscopic, and Molecular Mechanics Methods

Qu¹,

Kim²,

Lee³

et al. 2009

J. Phys. Chem. C

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1,6-Hexanedithiol (HSC 6 SH) self-assembled monolayers (SAMs) on Au(111) were formed in a 1 mM ethanolic solution and were investigated by voltammetry in 0.1 M aqueous KOH solution. HSC 6 SH SAMs on Au(111) were further probed by X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM), sum frequency generation spectroscopy (SFG), and molecular mechanics calculation (MMC). An identical investigation was performed with the self-assembly of hexanethiol (C 6 SH) on Au(111) for comparison. Linear sweep voltammograms showed that a full monolayer of thiolate (7.6 ((0.2) × 10 -10 mol -2) chemisorbed on Au(111) with both HSC 6 SH and C 6 SH, while the peak potential of the electroreduction of the former assembly was more negative than that of the latter. XPS revealed that two different forms of sulfur existed at HSC 6 SH SAMs on Au(111), i.e. a thiolate and a thiol. The STM image could not be resolved with HSC 6 SH SAMs, while it was atomically well-defined with the C 6 SH case. SFG results showed that alkyl chains within the HSC 6 SH SAMs were in an all-trans conformation. Thus the experimental results concluded that densely packed and higly oriented HSC 6 SH SAMs could be successfully formed on Au(111) with the incubation conditions in the practical solution. MMC presented that HSC 6 SH SAMs were more stable than C 6 SH ones because of the additional end-end interaction among the thiol groups faced up to the air, albeit both SAMs were tilted by 28°from the surface normal.

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Charging effects in gold nanoclusters grown on octanedithiol layers

Cited by 74 publications

References 8 publications

Electrochemical Metal Deposition on Top of an Organic Monolayer

Electrochemical Metal Deposition on Top of an Organic Monolayer

<i>n</i>-Alkane Monolayer on a Au(111) Template for Metal Growth<i><sup> </sup></i>

1,6-Hexanedithiol Self-Assembled Monolayers on Au(111) Investigated by Electrochemical, Spectroscopic, and Molecular Mechanics Methods

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