A Low-Energy Ion Scattering Approach for Studying Au Nanoclusters Grown on an H2O Buffer Layer
| Autor: | Christopher Salvo, Jory A. Yarmoff |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scattering Annealing (metallurgy) Analytical chemistry 02 engineering and technology Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Ion Nanoclusters Amorphous solid Adsorption Low-energy ion scattering 0103 physical sciences Electrochemistry General Materials Science 010306 general physics 0210 nano-technology Single crystal Spectroscopy |
| Zdroj: | Langmuir. 33:5439-5445 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.7b00386 |
| Popis: | A novel form of alkali low-energy ion scattering is used to probe the deposition of nanoclusters onto a solid surface via buffer layer assisted growth (BLAG) in ultrahigh vacuum. A thin amorphous solid water (ASW) buffer layer is grown on a TiO2(110) single crystal cooled to 100 K. Au atoms deposited onto this layer arrange themselves into nanoclusters. The sample is then annealed to 320 K to desorb the ASW and enable the clusters to soft-land onto the substrate. Time-of-flight low-energy ion scattering, using Li+, Na+, and K+ projectiles, probes the materials during each step of the BLAG process to measure the surface composition and reveal the details of how the clusters form. The neutralization probability of Na+ ions singly scattered from the Au nanoclusters indicates that they increase in size after annealing and that the magnitude of the increase is a function of the buffer layer thickness. The adsorption of a thin, incomplete water layer prior to Au deposition forms nanoclusters that are possibly e... |
| Databáze: | OpenAIRE |
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