Metal-insulator transitions in metal clusters: a high-energy spectroscopy study of palladium and silver clusters

Vijayakrishnan, V.; Chainani, A.; Sarma, D. D.; Rao, C. N. R.

doi:10.1021/j100201a002

Cited by 104 publications

(64 citation statements)

References 2 publications

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“…Ultraviolet photoelectron spectroscopy (UPS) and bremmstrahlung isochromat spectroscopy (BIS), on the other hand, provide information on the occupied and unoccupied levels respectively near E f . In the last few years, several experiments have been carried out on nanoparticles in the desired size range obtained by the deposition of metals on amorphized graphite and other substrates, using electron spectroscopic techniques [6,7]. The particles were obtained by the resistive evaporation of the corresponding metal in vacuum.…”

Section: Electronic Structure Of Metal Nanoparticlesmentioning

confidence: 99%

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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: 99%

“…The electronic band structure of metal nanoparticles near the Fermi level as revealed by UPS and BIS techniques is of considerable interest [6][7][8]. In Fig.…”

Section: Electronic Structure Of Metal Nanoparticlesmentioning

confidence: 99%

Metal nanoparticles, nanowires, and carbon nanotubes

Rao

Kulkarni

Govindaraj

et al. 2000

Pure and Applied Chemistry

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“…This size-dependent change of the DOS provides evidence for the appearance of MIT with decreasing particle size. [4,20,21] MIT can be found in the particle-size range of~0.6-1.2 nm, and at this particle size regime, the number of Au atoms bound to SiO 2 is comparable with those of Au atoms unbound to SiO 2 (see Figure 1 c). When the particle size is smaller than 0.6 nm, the AuÀSiO 2 component is dominant.…”

Section: Resultsmentioning

confidence: 88%

Metal‐Insulator Transition‐Induced Adsorption‐Resistant Behavior of Small Au Nanoparticles

et al. 2009

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Smaller nonmetallic nanoparticles are more inert: Metal-insulator transition of Au nanoparticles on silica is closely related to the metal-support charge transfer, which has a strong influence on chemisorption reactivity of Au. Smaller nonmetallic Au nanoparticles are more resistant towards butanethiol chemisorption [picture and graph: see text].The size-dependent variation of the electronic and chemical properties of Au nanoparticles formed on native Si oxide surfaces is investigated using synchrotron radiation photoemission spectroscopy and ultraviolet photoelectron spectroscopy. The adsorption reactivity toward butanethiol adsorption initially increases with decreasing particle size; however, the reactivity of Au nanoparticles becomes gradually lower below a size of approximately 0.8 nm. The photoemission spectral changes suggest a metal-insulator transition, accompanied by negative charge transfer from the nanoparticles to the support, which may be the source of the chemical inertness of small Au nanoparticles.

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“…In work done by Vijayakrishnan et al [79], the metal-insulator transition in metal clusters was investigated using high energy spectroscopy on Pd and Ag clusters. For both studies, the Pd and Ag were deposited on amorphous graphite substrates.…”

Section: Electronic Structure Effects On Pd Catalystsmentioning

confidence: 99%

Influence of Structural, Microstructural and Electrical Properties on Electrocatalytic Performance at the Nanoscale

2011

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In the field of electrocatalysis, significant work has been done over the past few decades on the effect of particle size on electrocatalytic performance. It has been shown in literature that as catalyst particle diameter has decreased into the nanometre scale, four different trends with respect to particle size on electrocatalytic activity have been observed. These four different trends can be classified as either structure sensitive or structure insensitive and are represented by either no change in electrocatalytic activity with respect to particle size, an increase in activity with a decrease in particle size, a decrease in activity with a decrease in particle size or an increase in activity until the catalyst reaches an optimal performance, followed by a decrease in activity with further decreasing of the catalyst size. These changes in electrocatalytic activity have been observed mainly in the mitohedrical region, which is the transition region between atomistic material properties and bulk material properties. To account for these different trends that exist between particle size and electrocatalytic activity, many different theories have been proposed. The purpose of this paper is to highlight and explain these different theories for the reader and to provide a clearer understanding of the current knowledge base with respect to nanoparticle catalysts. In particular, this paper looks at the effects of electronic structure, support structure, particle geometry and microstructure on electrocatalytic performance.

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Metal-insulator transitions in metal clusters: a high-energy spectroscopy study of palladium and silver clusters

Cited by 104 publications

References 2 publications

Metal nanoparticles, nanowires, and carbon nanotubes

Metal nanoparticles, nanowires, and carbon nanotubes

Metal‐Insulator Transition‐Induced Adsorption‐Resistant Behavior of Small Au Nanoparticles

Influence of Structural, Microstructural and Electrical Properties on Electrocatalytic Performance at the Nanoscale

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