Electrodeposition of iron core-shell nanoparticles on a H-terminated Si(100) surface

Abstract

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Formation of Ferromagnetic Iron Core-Shell Nanocubes on a H-Terminated Si(100) Surface by Electrodeposition

“…In our recent work involving electrodeposition in an FeCl 3 solution, the as-deposited oval-shaped nanorod Fe particles were found to consist of Fe cores with composite FeOOH and FeO shells, while the spherical NPs correspond to Fe cores with composite Fe 2 O 3 and FeO shells. 20 In the present cubic NP case, there is a sizable Fe 2p feature corresponding to metallic Fe before sputtering, which was not observed in the case of the oval-shaped nanorods and spherical NPs. This confirms that the oxide shell for the cubic NPs must be not only thinner than those of the oval-shaped nanorods and spherical NPs but also less than the escape depth of the Fe 2p photoelectron at 780 eV kinetic energy ͑ϳ6 nm͒.…”

“…19 Recently, we reported the synthesis of near-monosized Fe oval-shaped nanorods ͑130 nm length ϫ 25 nm diameter͒, the so-called nanorice particles, and spherical NPs ͑6-40 nm diameter͒ by using electrodeposition on a H-Si͑100͒ ͑i.e., H-terminated͒ electrode at different FeCl 3 concentrations. 20 Although these Fe core-shell NPs could be deposited with well-defined shapes uniformly, a considerable amount of oxide shell was found, which consequently limited the observable magnetic properties of the Fe core itself. To date, it remains a big challenge to deposit a homogeneous layer of individual, welldefined nanostructured particles with significant Fe cores.…”

Morphology, structure, and magnetism of FeCo thin films electrodeposited on hydrogen-terminated Si(111) surfaces

“…At the end of the cyclic voltammogram, i.e., in the potential region of −900 to 0 mV, an anodic current is observed. As previously described, this anodic region can be assigned with oxidation of Fe to Fe 2+ and Fe 2+ to Fe 3+ (or Fe to Fe 3+ in some part) [22,24]. The reduction wave, as well as cathodic and anodic current peaks, becomes larger and more intense with addition of Co.…”

“…Zarpellon et al [22] reported that the Fe films electrodeposited on a Si(111) substrate exhibit submicrometer grains with slightly flat terraces on the surface, along with the presence of iron silicides. Lee et al [23] have shown that α-Fe(110) films with nearly monosized nanostructures of spherical shapes on an n-type Si(111) substrate could be grown by pulsed electrodeposition in a nonaqueous solution, and Zhao et al [24] reported the synthesis of near-monosized Fe oval-shaped nanorod particles and spherical nanoparticles using electrodeposition on a hydrogen-terminated Si(100) surface from aqueous FeCl 3 solutions. Although the Fe core-shell thin films and nanostructures can be deposited uniformly and with well-defined shapes, the influence of the considerable oxide shells is detrimental for their magnetic properties.…”

Influence of TiO2 dimension and graphene oxide content on the self-cleaning activity of methylene blue-stained photocatalytic films

“…Numerous techniques have been applied to fabricate TiO 2 films on glass, metal or ceramic substrates such as dip-coating, sol-gel, Langmuir-Blodgett technique, electrodeposition, and layer-by-layer deposition [4][5][6][7]. The fabrication of macro-/meso-porous TiO 2 or the introduction of silica component is usually required to improve the surface area and hydrophilicity for inorganic TiO 2 film [7][8][9].…”