Low‐Symmetry Iron Oxide Nanocrystals Bound by High‐Index Facets

Abstract

Just the shape of it: Tetrakaidecahedral (see picture, left) and oblique parallelepiped (right) α‐Fe2O3 polyhedra with exposed high‐index facets were obtained in high yield. Magnetic studies show that these two forms of iron oxide have distinct magnetic properties owing to their different shapes and different exposed high‐indexed facets.

Polyhedral 30‐Faceted BiVO4 Microcrystals Predominantly Enclosed by High‐Index Planes Promoting Photocatalytic Water‐Splitting Activity

“…[10] However, the generation of metal oxide micro-and nanocrystallites with high-index surfaces is comparatively more difficult due to the presence of strong metal-oxygen bonds and diverse crystal packing structures. [11] Only a few binary metal oxides, such as Co 3 O 4 , [12] anatase TiO 2 , [13][14][15] Fe 3 O 4 , [16] Cu 2 O, [17,18] and SnO 2 , [19] have been successfully achieved. Multinary metal oxide crystals are relatively more meaningful than binary ones because they not only possess more complex functions, but their properties also be readily adjusted by tuning the ratio of the component elements.…”

Novel Composites of α‐Fe2O3 Tetrakaidecahedron and Graphene Oxide as an Effective Photoelectrode with Enhanced Photocurrent Performances

“…The α-Fe 2 O 3 tetrakaidecahedrons prepared by a hydrothermal process without any organic additives display good crystallinity, which are modifi ed by graphene oxide afterward. Other than the previous reports involving viscous macromolecules, [ 25,27,28 ] F − anion, [ 26 ] and diethylenetriamine, [ 31 ] the hydrothermal synthesis of α-Fe 2 O 3 tetrakaidecahedrons is specially facile and environmental, which only uses FeCl 2 •4H 2 O, NaOH, and ultrapure H 2 O as reaction precursors. Through photoelectrochemical investigation, this kind of α-Fe 2 O 3 /graphene photoelectrode shows superior photocurrent response than that of pure α-Fe 2 O 3 with higher photocurrent and lower onset potential.…”

Shape-controlled synthesis of Fe3O4 nanocrystals with incontinuous multicavities

“…To date, Fe 3 O 4 nanoparticles with different morphologies, such as nanosphere [11] , tetrakaidecahedra [12] , pyramid [13] , nanosheet, flower-liked structure [14] , spindle [15] , nanoring [16] , dendrite pattern [17] , and wire-like structure [18] have been synthesized with the help of a variety of methods, including reverse-micelle transition, hydro-or solvothermal treatment, magnetic-field induction, wet-chemical etching, chemical vapor deposition and polyol-mediated processes [19][20][21][22][23] . Except for morphology controlled synthesis, the formation mechanism of Fe 3 O 4 nanoparticles obtained via various methods has also been discussed and investigated.…”