Thiol-Derivatized Nanocrystalline Arrays of Gold, Silver, and Platinum

Sarathy, K. Vijaya; Raina, Gargi; Yadav, Ramkuber T.; Kulkarni, Giridhar U.; Rao, C. N. R.

doi:10.1021/jp971544z

Cited by 271 publications

(214 citation statements)

References 20 publications

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“…In metal colloids, surface plasmon excitations impart characteristic colors to the metal sols, the wine-red color of the gold sols being well-known. We found that colloidal particles of 4.2 and 2.1 nm diameters exhibit a distinct band around ~525 nm [9], the intensity of which increases with size. The intensity of this feature becomes rather small in the case of the 1-nm-diameter particles (£200 atoms).…”

Section: Electronic Structure Of Metal Nanoparticlesmentioning

confidence: 80%

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Metal nanoparticles, nanowires, and carbon nanotubes

Rao

Kulkarni

Govindaraj

et al. 2000

Pure and Applied Chemistry

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Abstract:The size-dependent metal to nonmetal transition in metal nanoparticles has been investigated using photoelectron and tunneling spectroscopic techniques. Metal nanoparticles capped by thiols are shown to organize into ordered 2D and 3D structures. Single-walled nanotubes and aligned carbon nanotube bundles have been synthesized by controlling the size of metal nanoparticles produced in situ during the pyrolysis of precursors. Nanowires of gold and other metals have been produced in the capillaries of the single-walled nanotubes.

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Section: Electronic Structure Of Metal Nanoparticlesmentioning

confidence: 80%

“…5. The metal particles form closepacked structures extending over tens of nms with a regular spacing of ~1 nm between them [9]. X-ray diffraction pattern of this array exhibits a low-angle peak corresponding to a d spacing of 5.0 nm (Fig.…”

Section: Two-dimensional Arraysmentioning

confidence: 99%

Metal nanoparticles, nanowires, and carbon nanotubes

Rao

Kulkarni

Govindaraj

et al. 2000

Pure and Applied Chemistry

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“…49,50 One of the most commonly studied classes of metallic nanoparticles consists of colloidal gold or silver crystallites that are nucleated and grown from metallic ions in solution and are stabilized by simultaneous attachments of alkanethiols HS-(CH 2 ) nϪ1 -CH 3 ͑or thiol derivatives͒ onto their surface ͑denoted as ''AuSCn'' or ''AgSCn''͒. 3,4,[29][30][31][32][33][34][35][36][37][52][53][54][55][56][57][58][59][60][61][62] Evidence that a 2D assembly of this class of nanoparticles may exhibit an interesting collective behavior under certain conditions has been provided by the recent studies of Langmuir films by Heath and co-workers. 3,4,34 -37,52,53 Their samples consisted of AuSCn (nϭ9, 12,18) and AgSCn (n ϭ3, 5,6,8,10,12) particles with mean metal-core diameters D ranging from 18 to 80 Å.…”

Section: Introductionmentioning

confidence: 99%

Monolayer/bilayer transition in Langmuir films of derivatized gold nanoparticles at the gas/water interface: An x-ray scattering study

Fukuto

Heilmann

Pershan

et al. 2004

The Journal of Chemical Physics

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The microscopic structure of Langmuir films of derivatized gold nanoparticles has been studied as a function of area/particle on the water surface. The molecules (AuSHDA) consist of gold particles of mean core diameter D∼22 Å that have been stabilized by attachment of carboxylic acid terminated alkylthiols, HS–(CH2)15–COOH. Compression of the film results in a broad plateau of finite pressure in the surface pressure versus area/particle isotherm that is consistent with a first-order monolayer/bilayer transition. X-ray specular reflectivity (XR) and grazing incidence diffraction show that when first spread at large area/particle, AuSHDA particles aggregate two dimensionally to form hexagonally packed monolayer domains at a nearest-neighbor distance of a=34 Å. The lateral positional correlations associated with the two-dimensional (2D) hexagonal order are of short range and extend over only a few interparticle distances; this appears to be a result of the polydispersity in particle size. Subsequent compression of the film increases the surface coverage by the monolayer but has little effect on the interparticle distance in the close-packed domains. The XR and off-specular diffuse scattering (XOSDS) results near the onset of the monolayer/bilayer coexistence plateau are consistent with complete surface coverage by a laterally homogeneous monolayer of AuSHDA particles. On the high-density side of the plateau, the electron-density profile extracted from XR clearly shows the formation of a bilayer in which the newly formed second layer on top is slightly less dense than the first layer. In contrast to the case of the homogeneous monolayer, the XOSDS intensities observed from the bilayer are higher than the prediction based on the capillary wave model and the assumption of homogeneity, indicating the presence of lateral density inhomogeneities in the bilayer. According to the results of Bragg rod measurements, the 2D hexagonal order in the two layers of the bilayer are only partially correlated.

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“…The clusters formed conducting arrays when linked by aryl dithiols or aryl di-isonitriles. Studies of Pt nanocluster arrays are limited to the work of Sarathy et al, [11] who were able to form arrays of limited coherent domain size with dodecanethiol capped Pt nanoclusters.…”

Section: Introductionmentioning

confidence: 99%

Superlattices of Platinum and Palladium Nanoparticles

et al. 2002

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We have used a nonionic inverse micelle synthesis techique to form nanoclusters of platinum and palladium. These nanoclusters can be rendered hydrophobic or hydrophilic by the appropriate choice of capping ligand. Unlike AU nanoclusters, Pt nanoclustersshow great stability with thiol ligands in aqueous media. Alkane thiols, with alkane chains ranging from C6 to C18 were used as hydrophobic ligands, and with some of these we were able to form 2-D andor 3-D superlattices of Pt nanoclusters as small as 2.7 nm in diameter. Image processing techniques were developed to reliably extract from transmission electron micrographs (TEMs) the particle size distribution, and information about the superlattice domains and their boundaries. The latter permits us to compute the intradomain vector pair correlation function of the particle centers, from which we can accurately determine the lattice spacing and the coherent domain size. From these data the gap between the particles in the coherent domains can be determined as a function of the thiol chain length. It is found that as the thiol chain len@ increases, the gaps between particles within superlattice domains increases, but more slowly than one might expect, possibly indicating thiol chain interdigitation.

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Thiol-Derivatized Nanocrystalline Arrays of Gold, Silver, and Platinum

Cited by 271 publications

References 20 publications

Metal nanoparticles, nanowires, and carbon nanotubes

Metal nanoparticles, nanowires, and carbon nanotubes

Monolayer/bilayer transition in Langmuir films of derivatized gold nanoparticles at the gas/water interface: An x-ray scattering study

Superlattices of Platinum and Palladium Nanoparticles

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