Influence of an external electric field on the rapid synthesis of MoO₃ micro- and nanostructures by Joule heating of Mo wires

Abstract

The growth mechanism of layered α-MoO3 nano- and microplates on the surface of Mo wires during Joule heating has been investigated by application of an external electric field to the current carrying wire.

Growth of Metal Oxide Nanostructures by Thermal Oxidation of Metals Under Influence of External Electric Fields and Electric Current Flow

“…A study of the effect of the simultaneous application of the two conditions, Joule heating and external electric field, has been carried out in the case of Mo wires. [56] A schematic of the experimental set up to apply the external field with copper electrodes perpendicular or parallel to the electric current responsible of the Joule heating is shown in Figure 8. The results show that the external field enhances the growth rate of α-MoO 3 nano-and microplates as compared with the growth of structures in absence of the electric field.…”

“…The results show that the external field enhances the growth rate of α-MoO 3 nano-and microplates as compared with the growth of structures in absence of the electric field. It was proposed [56] that the rapid growth is due to a thermally assisted electric mechanism which favor the cations diffusion toward the surface. Other effect of the application of electric field is the growth of nanostructures, dendritic arrangements, nanoplates, and clusters of nanocrystals (Figure 9) on the copper electrodes placed parallel to the Mo wire, as in Figure 8a, or in the arrangement plate-pointed electrodes shown in Figure 8b.…”

“…Different diffusion processes, such as diffusion driven by high thermal gradient from the wire core to the surface [51] and thermally assisted electromigration [54][55][56] appear as the main mechanisms to explain the rapid growth of oxide nanowires and nano-and microplates formed during Joule heating of metal wires. Electromigration is a process of atomic diffusion in conductors driven by intense electric currents.…”

“…a) Nanoplates grown on the plate with parallel electrodes as in Figure 8a,b) nanocrystal clusters grown on the plate region in front of the pointed electrode as in Figure8b. Reproduced with permission [56]. Copyright 2020, Royal Society of Chemistry.…”

Deoxygenation reactions of nitrous oxide assisted by oriented external electric field

“…Strip out these reports, here, we tried a new strategy to reduce N 2 O with silanes via metal-free catalyst. It is known that oriented external electric field (OEEF) had been proved an effective, green, and controllable catalytic method, not only for the structures and properties of molecules, but also for the catalysis of chemical reactions [40][41][42][43][44][45][46][47][48]. In 2004, Shaik et al first reported that the OEEF could control the selectivity of iron-oxo porphyrin with propene [49].…”