Monolayer Protected Clusters of Gold and Silver

Brust, Mathias; Kiely, Christopher J.

doi:10.1002/3527602100.ch3

Cited by 21 publications

(23 citation statements)

References 87 publications

(125 reference statements)

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“…Therefore, the synthesis of metal cluster compounds by spontaneous self-assembly of thiols (for example, normal alkyl-thiols, HS(CH 2 ) n X, where n is the number of carbon atoms that form the chain length and X the end-group) on the metal nanoparticles surface has been extensively studied [2,[9][10][11][12]. Thiols are well-known ligand molecules because they can form a robust self-assembled monolayer on the metal nanoparticle surfaces through a strong metal-sulfur covalent bond, and are also able to bind together via Van der Waals interaction [13].…”

Section: Introductionmentioning

confidence: 99%

Dependence of Optical and Microstructure Properties of Thiol-Capped Silver Nanoparticles Embedded in Polymeric Matrix

et al. 2011

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Thiol-capped silver nanoparticles were prepared by in situ thermal decomposition of different silver(I)-thiolates precursors in a polymeric matrix. Depending on the structure of the organic coating, contact-free distribution of metal nanoparticles or nanoparticles aggregates were achieved. The structure and morphology of nanocomposites was analyzed by Transmission Electron Microscopy (TEM), and X-Ray Diffraction (XRD). Nanoparticles' interaction was investigated by differential scanning calorimetry (DSC), and UV-Visible spectroscopy. In particular, only silver nanoparticles coated by n-alkyl thiols aggregated, while a contact-free dispersion was obtained by cyclohexyl thiol-capped silver nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Dependence of Optical and Microstructure Properties of Thiol-Capped Silver Nanoparticles Embedded in Polymeric Matrix

et al. 2011

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“…These response processes, at once so alien to molecular chemistry yet so fundamental to metallurgy (including metallic colloids), are exemplified by the localized surface-plasmon resonances (LSPRs) in the optical spectra of gold-silver MPCs in dilute solutions. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] Gold nanoparticles in general have drawn a significant interest due to their inert nature to oxidation and corrosion and their unique optical and electronic properties. 21 Due to their localized surface plasmon resonance (LSPR) properties, 22 catalytic activity, and metallic nature, gold nanoparticles have been used in many applications including catalysis, [23][24][25][26] nanodevices, 27 sensor technology, [28][29] targeted drug delivery, [30][31] and other biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

“…Monolayer protected clusters (MPCs) of noble metals can be considered as unique metallurgical molecules. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] They have core-shell structures in which the metal core is encapsulated by a complete shell of covalently bonded ligands such as thiolates. This very thin monolayer of thiols generates an electrical double layer, known as the Stern layer, on the surface of gold nanoparticles, allowing gold nanoparticles to work as quantized double-layer (QDL) capacitors and store charge.…”

Section: Introductionmentioning

confidence: 99%

Toward Smaller Aqueous-Phase Plasmonic Gold Nanoparticles: High-Stability Thiolate-Protected ~ 4.5 Nm Cores

Hoque

Mayer²,

Ponce³

et al. 2019

Preprint

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<p>Most applications of aqueous plasmonic gold nanoparticles benefit from control of the core size and shape, control of the nature of the ligand shell, and a simple and widely applicable preparation method. Surface functionalization of such nanoparticles is readily achievable but is restricted to water-soluble ligands. Here we have obtained highly monodisperse and stable <i>smaller </i>aqueous gold nanoparticles (core diameter ~ 4.5-nm), prepared from citrate-tannate precursors via ligand exchange with each of three distinct thiolates: 11-mercaptoundecanoic acid, a-R-lipoic acid, and para-mercaptobenzoic acid. These are characterized by UV-Vis spectroscopy for plasmonic properties; FTIR spectroscopy for ligand exchange confirmation; X-ray diffractometry for structural analysis; and high-resolution transmission electron microscopy for structure and size determination. Chemical reduction induces a blueshift, maximally +0.02-eV, in the localized surface-plasmon resonances band; this is interpreted as an electronic (-) charging of the MPC gold core, corresponding to a -0.5-V change in electrochemical potential.</p>

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“…Copper is one of the most widely used materials of great importance in many industrial applications, especially in the electrical sector owning to its high conductivity, rich abundance, and low cost. Size reduction of materials for higher efficiency or new device functionality is one of the most focused subjects of current research [ 1 , 2 ]. Copper in its nano-sized form has attracted considerable attention owing to its novel catalytic, optical, and electrical properties [ 3 , 4 , 5 ], as well as its practical applications as environment remediation, as antibacterial agents, and as heat exchangers [ 6 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Development of Ferromagnetic Superspins in Bare Cu Nanoparticles by Electronic Charge Redistribution

Batsaikhan¹,

Chen²,

Lee³

et al. 2015

IJMS

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We report on the results of investigating the ferromagnetic properties of bare Cu nanoparticles. Three sets of bare Cu nanoparticle assemblies with mean particle diameters of 6.6, 8.1, and 11.1 nm were fabricated, employing the gas condensation method. Curie-Weiss paramagnetic responses to a weak driving magnetic field were detected, showing the appearance of particle superspins that overcomes the diamagnetic responses from the inner core. The isothermal magnetization displays a Langevin field profile together with magnetic hysteresis appearing even at 300 K, demonstrating the existence of ferromagnetic superspins in the Cu nanoparticles. Shifting of a noticeable amount of electronic charge from being distributed near the lattice sites in bulk form toward their neighboring ions in nanoparticles was found. The extended 3d and 4s band mixture are the main sources for the development of localized 3d holes for the development of ferromagnetic particle superspins in Cu nanoparticles.

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Monolayer Protected Clusters of Gold and Silver

Cited by 21 publications

References 87 publications

Dependence of Optical and Microstructure Properties of Thiol-Capped Silver Nanoparticles Embedded in Polymeric Matrix

Dependence of Optical and Microstructure Properties of Thiol-Capped Silver Nanoparticles Embedded in Polymeric Matrix

Toward Smaller Aqueous-Phase Plasmonic Gold Nanoparticles: High-Stability Thiolate-Protected ~ 4.5 Nm Cores

Development of Ferromagnetic Superspins in Bare Cu Nanoparticles by Electronic Charge Redistribution

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