Conduction Electron Spin Resonance in Small Particles of Gold

Dupree, R.; Fobwood, C. T.; Asmith, M. J.

doi:10.1002/pssb.19670240214

Cited by 30 publications

(8 citation statements)

References 9 publications

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“…131Hz)~IIIIl1 The results obtained for gold particles [151,152] are not very clear either. In the author's laboratory attempts to observe CESR in samples of colloidal gold with diameter from 3.4 to 25 nm were unsuccessful.…”

Section: Conduction Electron Spin Resonance (Cesr)mentioning

confidence: 94%

“…CESR in small particles has been observed in light metals such as lithium [115,[141][142][143][144][145][146], sodium [147][148][149], and aluminium [150],as well as in some heavy metals as gold [151,152], silver [153][154][155][156], and platinum [157]. Saiki et al [145]observed CESR in lithium particles at room temperature.…”

Section: Conduction Electron Spin Resonance (Cesr)mentioning

confidence: 99%

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Electronic properties of small metallic particles

1981

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Introduction 175 4.2. Magnetization of small superconducting particles 2. Phenomenological description of small particles 178 4.3. Microscopic theory of small superconductors 2.1. Interaction with electromagnetic radiation 178 4.4. Fluctuations in small superconducting particles 2.2. Mie's theory 178 5. Preparation of small particles 2.3. The dielectric constant of a small metallic particle 184 5.1. Metal colloids 2.4. The effective dielectric constant of the embedding 5.2. Granular metal films medium 189 5.3. Particles prepared by the gas-evaporation technique 3. Quantum size effects in small metallic particles 192 5.4. Particles prepared by nucleation and growth in a 3.1. Microscopic description of electrons in small particles 192 matrix 273 3.2. Kubo's small particle 197 5.5. Impregnated porous materials 275 3.3. Level statistics 201 Appendix I. Thermodynamic calculations for Kubo's small 3.4. Spectroscopy of the small particle level structure 213 particle 3.5. Experiments 217 Appendix II. Thermodynamic calculations for the particle 4. Superconductivity in small particles 232 with equal level spacing 4.1. Characteristic lengths of superconductors 232 References

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Section: Conduction Electron Spin Resonance (Cesr)mentioning

confidence: 94%

Section: Conduction Electron Spin Resonance (Cesr)mentioning

confidence: 99%

Electronic properties of small metallic particles

1981

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“…Electronic properties of supported Au particles It is well known that small particles supported on oxides can exhibit electronic, optical, and magnetic characteristics different from bulk materials (311)(312)(313)(314)(315)(316). In the case of gold, this is especially important as several researchers believe it is precisely these changes in the electronic character that give rise to its unique catalytic properties.…”

Section: 2mentioning

confidence: 99%

Surface chemistry of catalysis by gold

et al. 2004

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IntroductionGold has long been regarded as an "inert" surface and bulk gold surfaces do not chemisorb many molecules easily. However, in the last decade, largely through the efforts of Masatake Haruta, gold particles, particularly those below 5 nm in size, have begun to garner attention for unique catalytic properties (1-8). In recent years, supported gold particles have been shown to be effective as catalysts for low temperature CO oxidation (9), selective oxidation of propene to propene oxide (10), water gas shift (11), NO reduction (12), selective hydrogenation of acetylene (or butadiene) (13)

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“…One study of butadiene + D 2 was frustrated by H/D spillover [24]; a detailed study of the reaction of propene with D 2 has also been reported, indicating even greater complexity than usual [34]. & Little more seems to have been reported on the esr of small Au particles: one study [35] on 3 nm particles detected spins (g = 2.26, mean width 200 G) arising from 'severe inhibition of the electron-phonon interaction'. Particles 2-8 nm in size have also revealed similar spin effects [36].…”

Section: What Has Not Been Done-and Whymentioning

confidence: 99%

Hydrogenation by gold catalysts: an unexpected discovery and a current assessment

Bond

2016

Gold Bull

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Gold in the massive state shows little tendency either to chemisorb simple molecules or to act catalytically. The discovery made in 1973 that low loadings of Au on Al 2 O 3 and particularly on SiO 2 were active in alkene hydrogenation when prepared by thermal decomposition of adsorbed AuCl 4 − paved the way for later extensive studies of catalysis by this metal. The activity was attributed to that being Au particles <4 nm in size, and it soon appeared that similar catalysts performed the selective hydrogenation of 2-butyne and 1,3-butadiene. Later work strongly suggests that Au particles below ∼2.5 nm in size, and having non-metallic character, are especially adept at H 2 chemisorption and H 2 -D 2 equilibration, and that alkene hydrogenation then occurs in an H-rich environment. Larger Au particles have more limited activity, perhaps associated with atoms of low coordination number and an H-poor environment.

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Conduction Electron Spin Resonance in Small Particles of Gold

Cited by 30 publications

References 9 publications

Electronic properties of small metallic particles

Electronic properties of small metallic particles

Surface chemistry of catalysis by gold

Hydrogenation by gold catalysts: an unexpected discovery and a current assessment

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