Polar Step-Driven Metal Nucleation and Growth: The Ag/ZnO(101̅0) Case

Autor:	Stefania Benedetti, Alexandra Toumar, Edouard Touzé, Sebastián Castilla, Yael Bronstein, Ilaria Valenti, Rémi Lazzari, Sergio Valeri, Fabio Finocchi
Rok vydání:	2020
Předmět:	Materials science Nucleation Electron Epitaxy Silver nanoparticle Surfaces Coatings and Films Electronic Optical and Magnetic Materials Metal General Energy Chemical physics visual_art visual_art.visual_art_medium Physical and Theoretical Chemistry Ionization energy Anisotropy Plasmon
Zdroj:	The Journal of Physical Chemistry C. 124:6130-6140
ISSN:	1932-7455 1932-7447
Popis:	The morphology, epitaxy, band-alignment and optical response of silver nanoparticles on ZnO(1010) has been analysed by microscopy, photoemission, electron diraction and dier-ential reectivity. At 700 K, clusters tend to nu-cleate and grow exclusively along [010]-oriented polar steps and corners, and not on at terraces or non-polar [001] steps. This preference leads to a specic epitaxy Ag(111)[110] ZnO[010](1010) with a large lattice mismatch along the dense row of the metal. The experiments have been rationalized through ab ini-tio simulations. A much lower adsorption energy is obtained for the O-terminated steps with a charge transfer from silver to oxygen, that corroborates the variation of ionization energy observed in photoemission and the presence of cationic silver. This anisotropy of growth reverberates in the plasmonic response of the metallic particles. The growth and epitaxy of metals on the polar (0001) and non-polar (1010) ori-entations of ZnO is discussed in terms of sur-face/step polarity compensation in the light of the present ndings.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7a9eae1a1c015e21acf1a83a5b70cf9e https://doi.org/10.1021/acs.jpcc.9b11464 Zobrazit plný text záznamu