Li+ ion neutralization on Ag layers grown on Cu(111)

Wiatrowski, M.; Lavagnino, L.; Esaulov, Vladimir A.

doi:10.1016/j.susc.2007.03.010

Cited by 14 publications

(8 citation statements)

References 28 publications

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“…It is for this reason that we mentioned above that in the case of an increase in the work function one can expect a smaller neutralization. As seen in the figure for the gold film and noted by us previously, however, neutralization does occur on high work function surfaces. − Several recent theoretical works have been devoted to this aspect. One of the interesting aspects that emerged is that very near the metal surface the Li (2s) level actually lies below the Fermi level , for some distance less than Z C and hence at small distances Li + can be neutralized.…”

Section: General Trends and Discussionmentioning

confidence: 50%

Electron Transfer Processes on Supported Au Nanoclusters and Nanowires and Substrate Effects

et al. 2015

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The catalytic activity of metal nanoclusters is considered to depend on their size, morphology, and substrate type. Here we address this problem by studying changes in electron transfer processes, that are important in surface chemistry, on the example of the interaction of Li ions with gold nanostructures as a function of their sizes and substrate type. The Au nanoclusters were grown on highly ordered pyrolytic graphite (HOPG) and Al 2 O 3 surfaces. In the case of Al 2 O 3 and sputtered HOPG surface, a wide surface coverage distribution of nanoclusters is formed, whereas on pristine HOPG scanning tunneling microscopy (STM) images show that Au clusters nucleate at step edges and can coalesce into "nanowires". We found that electron transfer is much more probable on small clusters than on bulk Au surfaces. For distributed clusters, electron transfer is most probable for lateral size is of the order of 2−3 nm and height is in the 1 nm range, that is, of the order of a few atomic layers. Interestingly, larger electron transfer rates were found on cluster chains or nanowires nucleated on HOPG step edges in the case of pristine HOPG than on isolated clusters on HOPG planes. Our results suggest that the main effects that are observed are largely related to cluster size and morphology.

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Section: General Trends and Discussionmentioning

confidence: 50%

Electron Transfer Processes on Supported Au Nanoclusters and Nanowires and Substrate Effects

et al. 2015

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“…The results of this study need to be put into the perspective of a complex problem related in general to alkali ion neutralization on metal surfaces. While alkali neutralization on bulk metal surfaces seemed well understood [18][19][20], recent experiments [21][22][23][24] revealed very wide discrepancies with predictions of these "standard" jellium-like models of metals using a rate equation approach to describe neutralization. It was indeed found, as may also be seen in the Au thin film limit of Fig.…”

Section: Resultsmentioning

confidence: 99%

Electron transfer processes on Au nanoclusters supported on graphite

et al. 2013

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Electron transfer processes play an important role in surface chemistry. This paper presents results of a study of changes in resonant electron transfer processes, as a function of gold cluster sizes, on the example of electron transfer between Li + ions scattered on Au clusters on highly oriented pyrolytic graphite (HOPG). The gold nanoclusters were grown on lightly sputtered HOPG surface in order to obtain a wide coverage distribution of clusters. The growth of clusters was monitored by scanning tunneling microscopy. We found that electron transfer is much more probable on small clusters, whose lateral size is of the order of 2 to 3 nm and height in the 1-nm range, than on bulk Au or thin Au films. A comparison with Au clusters grown on the semiconducting titania did not reveal significant differences with HOPG.

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“…Thus scattering on clusters and monolayer thin films has attracted attention [24][25][26]. Experimental studies of alkalimetal neutralization on supported Ag and Au clusters were performed [24,25] in the quest of observation of quantum-size effects [27][28][29], and showed that alkali-metal neutralization proceeds much more efficiently on small clusters than on films or bulk metal surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…The studies of alkali-metal ion neutralization on clusters and thin films [24,26] revealed a very curious feature, which is not understandable in "standard" models. Thus in the limit of complete surface coverage by Au(111)-type films it was observed that efficient neutralization of Li occurs, in spite of a very large (5.4 eV) work function [32].…”

Section: Introductionmentioning

confidence: 99%

Li+-ion neutralization on metal surfaces and thin films

et al. 2011

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Li + ions with energies ranging from 0.3 to 2 keV are scattered from Au(110) and Pd(100) surfaces and from ultrathin Ag film grown on Au(111) in order to study electron transfer phenomena. We find that neutralization occurs quite efficiently and find an anomalous ion energy dependence of the neutral fraction for Au (110) and Pd(100) surfaces previously noted for Au(111). The dependence of the neutral fraction on the azimuthal angle of the Au(110) and Pd(100) surfaces is reported. In the case of Ag monolayer on Au (111), results are similar to the case of the Ag(111) surface. To understand the anomalous ion energy dependence, we present a theoretical study using density functional theory (DFT) and a linearized rate equation approach, which allows us to follow the Li charge state evolution for the (111) surfaces of Ag, Au, and Cu, and for the Ag-covered Au(111) surface.

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Li+ ion neutralization on Ag layers grown on Cu(111)

Cited by 14 publications

References 28 publications

Electron Transfer Processes on Supported Au Nanoclusters and Nanowires and Substrate Effects

Electron Transfer Processes on Supported Au Nanoclusters and Nanowires and Substrate Effects

Electron transfer processes on Au nanoclusters supported on graphite

Li+-ion neutralization on metal surfaces and thin films

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