Thin oxide film growth on Fe(100)

Synthesis and Characterization of Monodisperse Hollow Fe3O4 Nanoparticles

“…This is consistent with the observation that the metal is the faster diffusing component in a diffusion couple of metal and oxygen. [12] The TEM images in Figure 3 c and d also show an Fe bridge (or several Fe bridges) between core and shell, which is similar to what has been observed in the synthesis of hollow CoS nanoparticles. [5] The bridge seems to provide a fast transport path for outward diffusion of Fe atoms and it stays connected to the shell until the core is completely consumed.…”

Oxidation Kinetics and Magnetic Properties of Elemental Iron Nanoparticles

“…Conversely, Fe MNPs are highly reactive and undergo rapid oxidation, which can signifi cantly change the particle magnetization over time. Compared with bulk material, [14][15][16] characterizing magnetic properties and oxidation mechanism of Fe MNPs remains challenging. Although there have been intensive investigation on Fe MNPs, [17][18][19][20][21] most of these studies employed particles with wide size distribution.…”

“…To form oxide layers, free electrons from metal should enter the conduction band of oxide, either through tunneling or thermionic emission. At room temperature, the dominant transport mechanism is through tunneling across the oxide barrier; the tunneling barrier potential for metal/oxide is about 1.25 eV, which is much larger than thermal energy (0.025 eV). Because the tunneling efficiency decreases exponentially with the barrier thickness, the oxide growth correspondingly slows down.…”

Enhanced oxidation resistance of active nanostructures via dynamic size effect

“…Fe and Fe oxide NSs have been widely explored as candidate materials in energy, environment and health technologies 13 16 17 . When pristine Fe is exposed to O 2 , FeO forms spontaneously 18 and is the desired phase for applications in catalysis 19 20 , lithium batteries 21 , optics 22 and magnetic devices 23 24 25 . FeO NSs supported on Pt have also been shown as a remarkable catalyst for the preferential oxidation of CO at low temperatures 19 .…”