Vanadium oxide nanostructures: from zero- to three-dimensional

Abstract

Oxide structures with nanometric dimensions exhibit novel physical and chemical properties, with respect to bulk oxide materials, due to the spatial confinement and the proximity of the substrate. They derive their atomic structure and morphology, on the one hand, from the interactions at the interface between the oxide overlayer and the substrate and, on the other hand, from kinetic constraints during the growth process. Here we describe the formation of vanadium oxide nanostructures on a single-crystal metal surface and their characterization by scanning tunnelling microscopy (STM) and ab initio density functional theory (DFT) calculations. We show that vanadium oxide nanostructures can be formed on Rh(111) with morphologies ranging from quasi-zero- to three-dimensional and that the oxide growth can be tuned into a particular dimensionality by careful adjustment of experimental parameters. These ‘artificial oxide phases’ display new physical and chemical properties, which make them potentially interesting materials for nanotechnology applications.

Redistribution of Supported Vanadium Oxide Catalysts by Pattern Formation

“…The Rh(111) surface covered with vanadium oxide (VO x ) in the submonolayer range has been investigated quite in detail by Netzer et al using scanning tunneling microscopy (STM) as main method [15][16][17][18]. A large number of ordered Rh-V-O-phases were discovered; for some of them structural models were proposed based on density functional theory calculations [18].…”

“…A large number of ordered Rh-V-O-phases were discovered; for some of them structural models were proposed based on density functional theory calculations [18]. The starting structure in our experiments is the ffiffi ffi 7 p  ffiffi ffi 7 p À Á R19.1°o verlayer; in the proposed model one unit cell contains 3 V and 9 O atoms arranged in O 4 V = O pyramids on 7 Rh atoms, with oxygen always connecting V to Rh.…”

Synthesis and magnetic properties of lanthanum orthovanadate nanorods

“…As a consequence, various 1D nanostructured materials were fabricated by a variety of methods, including templating direction, catalytic growth, electrochemistry, chemical vapor deposition, and solution-based solvothermal or hydrothermal treatment [5,6]. Chemical methods, especially hydrothermal methods were regarded as advantageous routes in preparing of high-quality anisotropic nanomaterials, such as 1D nanostructures [7,8].…”

V2O5 nanoparticles obtained from a synthetic bariandite-like vanadium oxide: Synthesis, characterization and electrochemical behavior in an ionic liquid

“…Vanadium oxides represent an important family of transition metal compounds that have received considerable attention from both the scientific and technological communities [1,2]. These oxides present fascinating electronic, optical, magnetic, electrochemical and structural properties, which make them suitable for several applications in catalysis [3,4], cathodes for Li + batteries [5][6][7], electrochromic devices [8], thermochromic windows [9], sensors [10], solar cells [11] and field effect transistors (FETs) [12], among others.…”