Adsorbate effects on photoemission from Ag

Kim, C.‐W.; Villagrán, J. C.; Even, U.; Thompson, J.C.

doi:10.1063/1.460674

Cited by 27 publications

(16 citation statements)

References 23 publications

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“…4(a)]. This is within the range of WF values found in the literature for macroscopic silver, 10,15,[54][55][56][57] meaning that the particles are metallic. Various studies [58][59][60] on free Ag clusters/nanoparticles showed that the macroscopic polycrystalline silver WF is likely to be 4.25 eV.…”

Section: Resultssupporting

confidence: 75%

Free silver nanoparticles doped by potassium: Work-function change in experiment and theory

Mikkelä

Jänkälä

Huttula

et al. 2021

The Journal of Chemical Physics

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The composition-dependent change in the work-function (WF) of binary silver-potassium nanoparticles has been studied experimentally by synchrotron-based x-ray photoelectron spectroscopy (PES) and theoretically using a microscopic jellium model of metals. The Ag-K particles with different K fractions were produced by letting a beam of preformed Ag particles pass through a volume with K vapor. The PES on a beam of individual non-supported Ag-K nanoparticles created in this way allowed a direct absolute measurement of their WF, avoiding several usual shortcomings of the method. Experimentally, the WF has been found to be very sensitive to K concentration: Already at low exposure, it decreased down to ≈2 eV-below the value of pure K. In the jellium modeling, considered for Ag-K nanoparticles, two principally different adsorption patterns were tested: without and with K diffusion. The experimental and calculation results together suggest that only efficient surface alloying of two metals, whose immiscibility was long-term textbook knowledge, could lead to the observed WF values.

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Section: Resultssupporting

confidence: 75%

Free silver nanoparticles doped by potassium: Work-function change in experiment and theory

Mikkelä

Jänkälä

Huttula

et al. 2021

The Journal of Chemical Physics

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“…14 Less attention has been given to the effect of organic adsorbate on the efficiency of photoelectron emission, and only a few works on the subject have been published. 15,16 Electron transmission through organic thin films condensed on metal substrates has been investigated in the past mainly by low-energy electron-transmission (LEET) spectroscopy. 17 It was suggested that for films of saturated hydrocarbon chains of various lengths, the low-energy electron transmission is governed mainly by the film electronic band structure.…”

Section: Experimental Backgroundmentioning

confidence: 99%

“…Similarly, LEET experiments were performed on solid water . Less attention has been given to the effect of organic adsorbate on the efficiency of photoelectron emission, and only a few works on the subject have been published. , …”

Section: Experimental Backgroundmentioning

confidence: 99%

Electron Transmission through Molecular Layers

Naaman¹,

Haran²,

Nitzan³

et al. 1998

J. Phys. Chem. B

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This article discusses general issues associated with electron transmission through thin molecular films. On the experimental side, we emphasize recent investigations of photoemission through organized organic films adsorbed on metal surfaces. Theoretical and numerical approaches to transmission and tunneling through such films are discussed. We focus on the relation between the structure of the film and its transmission properties. In the experimental work, these are controlled by varying the organic layer, by changing its thickness and by inducing disorder via thermal heating and by depositing mixtures of two molecular types. In numerical simulations of simple model systems, we consider the dimensionality of the process, effect of molecular ordering, and relation between electronic band structure in the film and its transmission properties. It is shown that electron transmission through thin molecular layers constitutes a sensitive tool for investigating molecular film properties in addition to providing a convenient prototype system for the study of electron transport in molecular electronic devices.

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“…A number of phenomena, such as surface-enhanced Raman scattering (SERS), photodissociation of organic molecules, or photoemission of electrons at the Ag/vacuum and Ag/solution interfaces, were found to depend strongly on the morphology of the silver metal surface. Procedures for the preparation of microscopically rough silver surfaces used in such studies involved chemical etching, electrochemical roughening, mechanical polishing of Ag with varying size of alumina, and metal sputtering in vacuum on various pre-etched substrates.…”

Section: Introductionmentioning

confidence: 99%

Effect of Halide Ion Adsorption upon Plasmon-Mediated Photoelectron Emission at the Silver/Solution Interface

1997

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The effect of the roughening of the silver surface upon photoemission observed in the presence of two different scavengers dissolved in an aqueous solution, CO2 and NO3 - ions, was re-examined. The quantum yield of the photocurrent exhibits a sharp maximum at 370−380 nm in the frequency range of surface plasmons on silver. These photoyields were strongly affected by the extent of the roughening of the Ag surface and reached an unusually large value of 0.05 electron per incident photon. Electrochemical oxidation/reduction roughening performed in the presence of Cl-, Br-, and ClO4 - ions, similar to that employed in enhanced Raman scattering (SERS) experiments, affected the maximum of the photocurrent and in some cases also its onset potential. Photocurrents arising at potentials more negative than the potential of zero charge (pzc) of silver were principally influenced by changing morphology of the surface resulting from more or less deep roughening performed in different solutions. On the other hand, the photoelectrochemical behavior of silver at potentials positive with respect to the pzc was clearly affected by the specific adsorption of anions of the supporting electrolyte. It was, in particular, the Br- anion that caused in this potential region the strongest enhancement of the photocurrent, associated with the reduction of scavengers and led to an apparent positive shift of the onset potential. The role played by the specifically adsorbed anions is interpreted in terms of slowing down the reverse reactions of solvated electrons and of reaction intermediates (such as, for example, the NO3 2- anion) returning to the electrode.

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Adsorbate effects on photoemission from Ag

Cited by 27 publications

References 23 publications

Free silver nanoparticles doped by potassium: Work-function change in experiment and theory

Free silver nanoparticles doped by potassium: Work-function change in experiment and theory

Electron Transmission through Molecular Layers

Effect of Halide Ion Adsorption upon Plasmon-Mediated Photoelectron Emission at the Silver/Solution Interface

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