A novel method for<i>in situ</i>visualization of the growth kinetics, structures and behaviours of gas-phase fabricated metallic alloy nanoparticles

Zhang, Lei; He, Longbing; Shi, Lei; Yang, Yaodong; Shang, Guan-Lei; Hong, Hua; Sun, Litao

doi:10.1039/d0ra01740j

Cited by 3 publications

(7 citation statements)

References 49 publications

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“…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).…”

Section: Resultsmentioning

confidence: 99%

“…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.…”

Section: Resultsmentioning

confidence: 99%

“…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.…”

Section: Results and Discussionmentioning

confidence: 99%

“…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 …”

Section: Results and Discussionmentioning

confidence: 99%

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

Shi

Shangguan

et al. 2022

ACS Nano

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Gas-phase synthesized binary nanoparticles (NPs) possess ultraclean surfaces, which benefit versatile uses in sensors and catalysts. However, precise control of their configuration and properties is still a big challenge because the growth mechanism and phase evolution dynamics in these NPs are very hard to unveil. Here, we report a strategy to investigate the phase evolution dynamics in binary NPs by using e-beam assisted ultrafast local heating and cooling inside a transmission electron microscope. With this strategy, the phase segregation and corresponding shape evolution of PbBi NPs are in situ revealed. It is found that the as-prepared PbBi alloy NPs will transform into heterostructures under e-beam stimulated structural relaxation, leading to the formation of featured Janus configurations with faceted Bi polyhedron parts and intermetallic hemisphere parts. During phase segregation, Pb 1 Bi 1 and Pb 7 Bi 3 phases are captured and identified, and a model of phase and shape evolution of PbBi nanoalloys is developed and contrasted with that of their bulk counterparts. These findings benefit the understanding of the phase dynamics of binary NPs and can provide in-depth information for engineering their structures for practical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

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

Shi

Shangguan

et al. 2022

ACS Nano

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“…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.…”

Section: Methodsmentioning

confidence: 99%

Controllable fabrication of hollow In₂O₃ nanoparticles by electron beam irradiation

Zhang

et al. 2022

Nanoscale

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Surface Chemistry-Dominated Shape and Phase Transitions in PbBi Binary Nanoparticles: Implications for the Stability of Nanomaterials in Application

Shi

Shangguan

Yang

et al. 2022

ACS Appl. Nano Mater.

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The surface effect in binary nanoparticles (NPs) is known as one of the origins from which extraordinary properties are derived. However, how the surface conditions of a binary NP affect its structure, phase, and property remains unclear. In this work, we use PbBi binary NPs as an example to perform an investigation on this issue. Alloy PbBi NPs with ultra-clean surfaces and a solid-solution phase are fabricated using a delicate evaporation-and-deposition (EAD) method inside a transmission electron microscope and later treated in situ in vacuum or ex situ in air to have different surface conditions. Their shape and phase evolution during structure relaxation are then monitored and compared. It is found that the PbBi NPs with different surface conditions undergo discrepant evolution scenarios. The ones with clean surfaces show a featured transition route from a spherical shape with a uniform phase to a faceted Janus shape with a separation phase, while the ones with thin surface oxidation present contrastive phase segregations confined inside the NPs, forming core−shell structures. Upon further oxidation, dealloying occurs in the alloy phase at the expense of depleting Pb atoms, resulting in featured heterogeneous interfaces and core−shell Bi@PbO x NPs, respectively. The findings here provide direct evidence for understanding the role of surfaces in determining the structure and phase evolutions in nanoalloys, thereby providing knowledge for revealing the stability of binary NPs in applications such as catalysis.

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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.

Cited by 3 publications

References 49 publications

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

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

Controllable fabrication of hollow In₂O₃ nanoparticles by electron beam irradiation

Surface Chemistry-Dominated Shape and Phase Transitions in PbBi Binary Nanoparticles: Implications for the Stability of Nanomaterials in Application

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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.

Cited by 3 publications

References 49 publications

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

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

Controllable fabrication of hollow In2O3 nanoparticles by electron beam irradiation

Surface Chemistry-Dominated Shape and Phase Transitions in PbBi Binary Nanoparticles: Implications for the Stability of Nanomaterials in Application

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Controllable fabrication of hollow In₂O₃ nanoparticles by electron beam irradiation