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19 April 2024 |
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Article overview
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Two-dimensional TiOx nanostructures on Au(111): a Scanning Tunneling Microscopy and Spectroscopy investigation | | F. Tumino
; P. Carrozzo
; L. Mascaretti
; C. S. Casari
; M. Passoni
; S. Tosoni
; C. E. Bottani
; A. Li Bassi
; | | Date: |
8 Sep 2015 | | Abstract: | We investigated the growth of titanium oxide two-dimensional (2D)
nanostructures on Au(111), produced by Ti evaporation and post-deposition
oxidation. Scanning tunneling microscopy and spectroscopy (STM and STS) and
low-energy electron diffraction (LEED) measurements characterized the
morphological, structural and electronic properties of the observed structures.
Five distinct TiOsub{x} phases were identified: the emph{honeycomb} and
emph{pinwheel} phases appear as monolayer films wetting the gold surface,
while nanocrystallites of the emph{triangular}, emph{row} and emph{needle}
phases grow mainly over the honeycomb or pinwheel layers. Density Functional
Theory (DFT) investigation of the honeycomb structure supports a $(2 imes 2)$
structural model based on a Ti-O bilayer having $ ext{Ti}_2 ext{O}_3$
stoichiometry. The pinwheel phase was observed to evolve, for increasing
coverage, from single triangular crystallites to a well-ordered film forming a
$(4sqrt{7} imes 4sqrt{7})R19.1^circ$ superstructure, which can be
interpreted within a moir~Ac{opyright}-like model. Structural characteristics
of the other three phases were disclosed from the analysis of high-resolution
STM measurements. STS measurements revealed a partial metallization of
honeycomb and pinwheel and a semiconducting character of row and triangular
phases. | | Source: | arXiv, 1509.2363 | | Services: | Forum | Review | PDF | Favorites | |
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