Adsorption of H on Si(111)-√3 × √3-Ag: evidence for Ag(111) agglomerates formation

Oura, Kenjiro; Sumitomo, Koji; Kobayashi, Tadashi; Kinoshita, Toshihiro; Tanaka, Yasunori; Shoji, Fumiyoshi; Katayama, Itsuo

doi:10.1016/0167-2584(91)90009-g

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“…The disruption of the Si(111)-√3×√3-Ag surface has also been observed for the adsorption of H atoms on the Si(111)-√3×√3-Ag surface, in which the formation of Ag(111) agglomerates induced by the adsorption of H atoms at room temperature has also been reported. 75 It was claimed that the conversion process of √3×√3-Ag to Ag metallic cluster could be reversed after (recombinative) desorption of H atoms at 500 °C. In our experiment, increasing the annealing temperature to 500 °C shows no change in the Ag 3d spectra in 3a1 shows the empty-state STM images of a pristine Si(111)-√3×√3-Ag surface (i.e., before any cysteine exposure).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Structural and Chemical Evolution of l-Cysteine Nanofilm on Si(111)-√3×√3-Ag: From Preferential Growth at Step Edges and Antiphase Boundaries at Room Temperature to Adsorbate-Mediated Metal Cluster Formation at Elevated Temperature

et al. 2019

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The interaction of cysteine molecules with the Si(111)-√3×√3-Ag surface has been investigated over the submonolayer to multilayer regime using X-ray photoelectron spectroscopy, scanning tunneling microscopy, and density functional theory calculations. With both upper step and lower step terraces, step edges, and antiphase boundaries, the √3×√3-Ag overlayer supported on Si(111) provides a rich two-dimensional template for studying site-specific biomolecular interactions. As an amino acid with three functional groups, cysteine is found to chemisorb through S−H bond cleavage and S−Ag bond linkage first at step edges and antiphase boundaries followed by island formation and expanded growth onto terraces. Intermolecular interactions are dominated by zwitterionic hydrogen bonding at higher coverages, producing a porous unordered interfacial layer composed of cysteine agglomerates at room temperature. Upon annealing, cysteine adsorbates induce structural transformation of the uniform √3×√3-Ag reconstructed surface lattice into metallic Ag clusters with a narrow size distribution and short-range ordering. Preferential nanoaggregate formation of cysteine at defect sites and cysteine-induced metal cluster formation promise a new approach to fabricating nanoclusters for potential applications in chemical sensing and catalysis.

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Section: ■ Results and Discussionmentioning

confidence: 99%