Facile Synthesis of Monodisperse Mn3O4 Tetragonal Nanoparticles and Their Large-Scale Assembly into Highly Regular Walls by a Simple Solution Route

摘要

The direct fabrication and assembly of very small structures into controlled nanopatterns is not only of scientific interest but also of down-to-earth practicality, with benefits such as cost and energy savings over traditional lithographic techniques.Manganese oxides are important materials in many applications, such as in catalyst, electrode, sensor, and magnetic materials.[1]-[6] Among them, Mn3O4 is known to be a good candidate as an active catalyst for the decomposition of waste gases,[7] as a corrosion-inhibiting pigment,[8], [9] and as an intercalation compound, such as in lithium manganese oxide, which is an electrode material for rechargeable lithium batteries.[10] Bulk Mn3O4 undergoes a ferrimagnetic transition at 42 K,[11] but Mn3O4 nanoparticles exhibit a size-dependent Curie temperature (TC).[12], [13] Recently, the synthesis of arrays of 4 nm FePt nanoparticles with an extremely narrow size distribution has spurred a significant research effort in the area of small magnetic nanoparticles.