A novel method forin situvisualization of the growth kinetics, structures and behaviours of gas-phase fabricated metallic alloy nanoparticles

Abstract

In situ visualizing the growth kinetics and behaviours of alloy nanoparticles by a novel EAD method.

Revealing the Phase Segregation and Evolution Dynamics in Binary Nanoalloys via Electron Beam-Assisted Ultrafast Heating and Cooling

“…Figure 1 shows the illustration of fabricating PbBi NPs using our previously developed method, that is, the in situ evaporation-and-deposition (EAD) method. 30 Generally, microsized alloy balls are used as the initial substance source. With intense electron beam (e-beam) irradiation, thermal accumulation can be achieved and localized at these microballs, and atoms are then sublimated/evaporated and later deposited on the supporting substrates nearby the microballs (see experimental section and Supporting Information for details).…”

“…Meanwhile, some of the NPs increase in size apparently, which is possibly due to the Ostwald ripening or the coalescences that occurred between them. 30 As indicated by the yellow dashed circles, the large NPs present different contrasts, revealing heterojunction structures with a hemisphere part and a faceted polyhedron part. Generally, the faceted polyhedron parts can be classified into two types from their shapes, that is, one type has a halfhexagon profile while the other type has a truncated rectangular profile.…”

“…Figure shows the illustration of fabricating PbBi NPs using our previously developed method, that is, the in situ evaporation-and-deposition (EAD) method . Generally, microsized alloy balls are used as the initial substance source.…”

“…Figure b shows the morphology of the phase-segregated PbBi NPs which have been irradiated under an e-beam intensity of about 110 A·m –2 for 40 s. It can be seen that most of the NPs have changed their shapes from spherical to irregular. Meanwhile, some of the NPs increase in size apparently, which is possibly due to the Ostwald ripening or the coalescences that occurred between them …”

Controllable fabrication of hollow In2O3 nanoparticles by electron beam irradiation

“…In NPs were synthesized using electron beam irradiation inside the TEM. 22–24 After intense electron beam irradiation, In NPs with a wide size distribution (Fig. 1b) were formed around initial InP mircoparticles due to either electron-beam heating or electrostatic charging/discharging.…”