Mn₃O₄ Thin Film on Cu(111): Modulating Electronic Structure through Film–Substrate Interaction

Abstract

We investigated the electronic and the structural properties of Mn 3 O 4 thin films grown on Cu(111) as a function of preparation conditions (oxygen partial pressure and thickness). Mn 3 O 4 films are grown at oxygen partial pressure of 5 × 10 −7 mbar and displayed a (110) preferential plane orientation arranged in different spatial domains to better adapt to Cu(111) lattice parameters. The relative angle between the domains varies as the film thickness increases. At the Mn 3 O 4 /Cu(111) interface, the valence band is strongly perturbed by the contribution of Cu 3d states that modify the Mn 3d electronic configuration. As a consequence, Mn 3s and Mn 2p core level spectra present characteristic new line shapes that were explained within the core-level relaxation framework. At variance with other metal substrates used for stabilizing manganese oxides thin films, the copper presents a 3d electronic distribution strongly overlapping the Mn 3d orbital and consequently affecting the overall electronic properties at the contact layer.

Experimental Investigation of Pure Spinel Mn3O4 Properties Synthesized through Chemical Spray Pyrolysis for Future Gas Sensor Application

“…The Spray pyrolysis based on air flow to pulverize the solution (pneumatic spray pyrolysis) is less used in the synthesis of this material and it competes with several sophisticated and expensive techniques. Our results, display the possibility to elaborate good Mn 3 O 4 properties with energy gain and time saving, by the use of air pulverization without neither oxygen sources nor annealing requires: CVD room, vacuum and low pressure [28] . The principle of gas detection is based on the conductivity variation of the sensitive layer in the presence of gases.…”

“…Our results, display the possibility to elaborate good Mn 3 O 4 properties with energy gain and time saving, by the use of air pulverization without neither oxygen sources nor annealing requires: CVD room, vacuum and low pressure. [28] The principle of gas detection is based on the conductivity variation of the sensitive layer in the presence of gases. The adsorption of the analyst (gas) by the sensitive material gives rise to the change of physical and chemical properties of the sensing material.…”

Growth and electronic properties of Co-doped Mn3O4 thin films: a combined experimental and theoretical investigation

“…A similar approach was already used in the analysis of diluted elements within a solid hosting matrix 8 or a thin film on a metallic substrate. 17,18 The interpretation of the Co 2p core level spectra obtained from PE measurements and the XAS spectra was assisted by calculations made using the semi-empirical cluster method based on Anderson Model Hamiltonian 19 implemented in CTMXAS software. 20 The cluster consists of a Co ion surrounded by oxygen: either octahedral (CoO 6 ) or tetrahedral (CoO 4 ) sites.…”

Dynamic Structural Evolution of Mn–Au Alloy and MnOx Nanostructures on Au(111) under Different Atmospheres

“…Model catalytic systems built in an ultrahigh-vacuum (UHV) environment and characterized by means of surface science techniques can provide an opportunity to understand the detailed reaction mechanism. 20−22 Fundamental studies over MnO x nanoislands and thin films have been performed on many metal single crystal substrates, including Pd, 23−25 Ag, 26−31 Rh, 32−35 Cu, 36,37 Au, 38−40 and Pt. 41−45 It is well-known that the symmetry and lattice constant of the substrate surface are critical for epitaxial growth of oxide thin films.…”

“…Fundamental studies over MnO x nanoislands and thin films have been performed on many metal single crystal substrates, including Pd, − Ag, − Rh, − Cu, , Au, − and Pt. − It is well-known that the symmetry and lattice constant of the substrate surface are critical for epitaxial growth of oxide thin films. For instance, a square oxide overlayer can be obtained on a substrate surface with tetragonal symmetry, such as epitaxial rock salt MnO(001) on Ag(001) , and spinel Mn 3 O 4 (001) on Ag(001) .…”