Initial stages of the interaction of sodium and cesium with gold

Ageev, V. N.; Afanas’eva, E. Yu.

doi:10.1134/s1063783406120171

Cited by 15 publications

(5 citation statements)

References 10 publications

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“…This gives rise to distortions of the shape of experimental thermal desorption spectra in this coverage range. Incidentally, the energy of pairwise lateral interactions of adatoms (ω = 0.3 eV) is slightly lower than that for the Si-W system studied by us earlier [11], where it was found to be ω = 0.35 eV. 5.…”

Section: Discussion Of Resultsmentioning

confidence: 55%

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10.1007/s11451-008-1032-1

2010

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The growth of Ge thin films on the surface of a textured predominantly (100)-oriented tungsten ribbon is studied by thermal desorption spectrometry at different substrate temperatures over a wide range of coverages. The mechanism of growth of the Ge films at T = 300 K is similar to a layer-by-layer mechanism. For T > 300 K, the films grow through the Stranski-Krastanov mechanism, according to which the completion of the monolayer coverage is followed by the formation of three-dimensional crystallites; as a result, the desorption kinetics changes. For small coverages (i.e., in the absence of lateral interactions), the activation energy of Ge desorption from W(100) is E = 4.9 ± 0.2 eV. In a monolayer, this activation energy decreases to E = 3.9 ± 0.2 eV due to the repulsive lateral interactions. The energy of pairwise lateral interactions is determined to be ω = 0.3 eV.

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Section: Discussion Of Resultsmentioning

confidence: 55%

“…The products of thermal desorption were analyzed with a pulsed time-of-flight mass spectrometer [7]. The flux of Ge atoms was derived from the Ge + ion current, which in the mass spectrum was identified by the mass line 73.…”

Section: Experimental Techniquementioning

confidence: 99%

10.1007/s11451-008-1032-1

2010

CrossRef Listing of Deleted DOIs

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“…Usually, the work function drastically decreases and then reaches saturation as the alkali metal coverage increases. The alloy formation can be formed by thermal evaporation to the cold film 30 or mixing two vapors. 31 The free sodium ions with water molecules can move toward gold electrode when negative field is applied to the gold electrode, and more sodium ions can stay a longer time near the gold electrode when the actuation frequency is low.…”

Section: Resultsmentioning

confidence: 99%

The Cause of Nanohole and Nanoparticle Formation on Au-Electrode after Actuation of Electro-Active Paper Actuator

et al. 2008

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Cellulose has been discovered as a smart material, which is termed as electro-active paper (EAPap). EAPap actuator revealed large displacement upon low actuation voltage and low electrical power consumption. However, the performance of the actuator was reduced as the actuation time increased. To investigate the performance degradation of the actuator, field emission scanning electron microscope (FESEM) images were taken on the surfaces of gold electrode of the actuator, and energy dispersive spectroscopy (EDS) was performed on them. Nanoparticles and nanoholes were observed on the surfaces of gold electrode after actuation, which might be strongly associated with the degradation of the actuator performance. The compositions of nanoparticles were gold and sodium. The degradation rate of the actuator performance and the number of nanoparticles at a low actuation frequency (2 Hz) were larger than those of a higher frequency (5 Hz). As the actuation voltage increased, the actuator performance degraded rapidly.

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“…The deposition of Cs on gold-covered tungsten is accompanied by the reduction of work function [16,24]. The two phases are observed in thermodesorption of Cs from the Cs-1 ML Au-W adsorption system, one of which is saturated and attributed to the Cs monolayer completion, whereas the second phase exhibits unsaturated growth and correlates with the formation of a semiconductor Cs x Au y compound [25].…”

Section: Discussionmentioning

confidence: 99%

Electron-stimulated desorption of cesium atoms from cesium layers adsorbed on gold-covered tungsten

Ageev

Kuznetsov

Potekhina

2010

J. Phys.: Condens. Matter

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The electron-stimulated desorption (ESD) yields and energy distributions (ED) for neutral cesium atoms have been measured from cesium layers adsorbed on a gold-covered tungsten surface as a function of electron energy, gold film thickness, cesium coverage and substrate temperature. The measurements have been carried out using a time-of-flight method and surface ionization detector in the temperature range 160-300 K. A measurable ESD yield for Cs atoms is observed only after deposition of more than one monolayer of gold and cesium on a tungsten surface at a temperature T = 300 K, which is accompanied by the formation of a CsAu semiconductor film covered with a cesium atom monolayer. The Cs atom ESD yield as a function of incident electron energy has a resonant character and consists of two peaks, the appearance of which depends on both electron energy and substrate temperature. The first peak has an appearance threshold at an electron energy of 57 eV and a substrate temperature of 300 K that is due to Au 5p3/2 core level excitation in the substrate. The second peak appears at an electron energy of 24 eV and a substrate temperature of 160 K. It is associated with a Cs 5s core level excitation in the Cs adsorbed layer. The Au 5p3/2 level excitation corresponds to a single broad peak in the ED with a maximum at a kinetic energy of 0.45 eV at a substrate temperature T = 300 K, which is split into two peaks with maxima at kinetic energies of 0.36 and 0.45 eV at a substrate temperature of 160 K, associated with different Cs atom ESD channels. The Cs 5s level excitation leads to an ED for Cs atoms with a maximum at a kinetic energy of ∼ 0.57 eV which exists only at T < 240 K and low Cs concentrations. The mechanisms for all the Cs atom ESD channels are proposed and compared with the Na atom ESD channels in the Na-Au-W system.

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Initial stages of the interaction of sodium and cesium with gold

Cited by 15 publications

References 10 publications

10.1007/s11451-008-1032-1

10.1007/s11451-008-1032-1

The Cause of Nanohole and Nanoparticle Formation on Au-Electrode after Actuation of Electro-Active Paper Actuator

Electron-stimulated desorption of cesium atoms from cesium layers adsorbed on gold-covered tungsten

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