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Fabrication of nanoscale Ga balls via a Coulomb explosion of microscale silica-covered Ga balls by TEM electron-beam irradiation.

Chen Y, Huang Y, Liu N, Su J, Li L, Gao Y - Sci Rep (2015)

Bottom Line: The explosion is confirmed to be a Coulomb explosion because it occurs on the surface rather than in the whole body of the insulating silica-covered Ga micro-balls, and on the pure Ga nano-balls on the edge of carbon film.The ejected particles in the explosion increase their sizes with increasing irradiation time until the stop of the explosion, but decrease their sizes with increasing distance from the original ball.The Coulomb explosion suggests a novel method to fabricate nanoscale metal particles with low melting point.

View Article: PubMed Central - PubMed

Affiliation: Center for Nanoscale Characterization and Devices (CNCD), Wuhan National Laboratory for Optoelectronics (WNLO)-School of Physics, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, P. R. China.

ABSTRACT
Nanoscale Ga particles down to 5 nm were fabricated by an explosion via an in situ electron-beam irradiation on microscale silica-covered Ga balls in a transmission electron microscope. The explosion is confirmed to be a Coulomb explosion because it occurs on the surface rather than in the whole body of the insulating silica-covered Ga micro-balls, and on the pure Ga nano-balls on the edge of carbon film. The ejected particles in the explosion increase their sizes with increasing irradiation time until the stop of the explosion, but decrease their sizes with increasing distance from the original ball. The Coulomb explosion suggests a novel method to fabricate nanoscale metal particles with low melting point.

No MeSH data available.


Related in: MedlinePlus

The size change of the Ga particles exploded from the original Ga ball (Fig. 2(a)) covered by silica.The four Ga particles marked by black arrows before irradiation (a) decreased their sizes after electron irradiation for 2890 s (b). The insets show the enlarged images of the region marked by arrows.
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f3: The size change of the Ga particles exploded from the original Ga ball (Fig. 2(a)) covered by silica.The four Ga particles marked by black arrows before irradiation (a) decreased their sizes after electron irradiation for 2890 s (b). The insets show the enlarged images of the region marked by arrows.

Mentions: Figure 3 shows another group of Ga particles exploded from the Ga ball in Fig. 2(a). Four Ga particles marked by black arrows (Fig. 3(a)) are dangling on the edge of the carbon film. As shown in Fig. 3(b), the four Ga particles after electron beam irradiation for 2890 s decrease their sizes from ~14 nm to ~11 nm, which should be due to the Coulomb explosion in the 2nd situation in Fig. 1(b): since the Ga ball is dangling on the C film, the generated positive charges due to electron beam irradiation cannot be restored and at last an explosion occurs. According to the above estimation, the critical value of σ is calculated to be ~3.605 × 10−2 C/m2 since the radius is ~12 nm, which means that 0.053% of total Ga atoms in the nanoball will lose 2 electrons per atom. For comparison, some nanoparticles without electron irradiation do not change their sizes, as shown in the circled region in Fig. 3(a,b).


Fabrication of nanoscale Ga balls via a Coulomb explosion of microscale silica-covered Ga balls by TEM electron-beam irradiation.

Chen Y, Huang Y, Liu N, Su J, Li L, Gao Y - Sci Rep (2015)

The size change of the Ga particles exploded from the original Ga ball (Fig. 2(a)) covered by silica.The four Ga particles marked by black arrows before irradiation (a) decreased their sizes after electron irradiation for 2890 s (b). The insets show the enlarged images of the region marked by arrows.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4477366&req=5

f3: The size change of the Ga particles exploded from the original Ga ball (Fig. 2(a)) covered by silica.The four Ga particles marked by black arrows before irradiation (a) decreased their sizes after electron irradiation for 2890 s (b). The insets show the enlarged images of the region marked by arrows.
Mentions: Figure 3 shows another group of Ga particles exploded from the Ga ball in Fig. 2(a). Four Ga particles marked by black arrows (Fig. 3(a)) are dangling on the edge of the carbon film. As shown in Fig. 3(b), the four Ga particles after electron beam irradiation for 2890 s decrease their sizes from ~14 nm to ~11 nm, which should be due to the Coulomb explosion in the 2nd situation in Fig. 1(b): since the Ga ball is dangling on the C film, the generated positive charges due to electron beam irradiation cannot be restored and at last an explosion occurs. According to the above estimation, the critical value of σ is calculated to be ~3.605 × 10−2 C/m2 since the radius is ~12 nm, which means that 0.053% of total Ga atoms in the nanoball will lose 2 electrons per atom. For comparison, some nanoparticles without electron irradiation do not change their sizes, as shown in the circled region in Fig. 3(a,b).

Bottom Line: The explosion is confirmed to be a Coulomb explosion because it occurs on the surface rather than in the whole body of the insulating silica-covered Ga micro-balls, and on the pure Ga nano-balls on the edge of carbon film.The ejected particles in the explosion increase their sizes with increasing irradiation time until the stop of the explosion, but decrease their sizes with increasing distance from the original ball.The Coulomb explosion suggests a novel method to fabricate nanoscale metal particles with low melting point.

View Article: PubMed Central - PubMed

Affiliation: Center for Nanoscale Characterization and Devices (CNCD), Wuhan National Laboratory for Optoelectronics (WNLO)-School of Physics, Huazhong University of Science and Technology (HUST), Luoyu Road 1037, Wuhan 430074, P. R. China.

ABSTRACT
Nanoscale Ga particles down to 5 nm were fabricated by an explosion via an in situ electron-beam irradiation on microscale silica-covered Ga balls in a transmission electron microscope. The explosion is confirmed to be a Coulomb explosion because it occurs on the surface rather than in the whole body of the insulating silica-covered Ga micro-balls, and on the pure Ga nano-balls on the edge of carbon film. The ejected particles in the explosion increase their sizes with increasing irradiation time until the stop of the explosion, but decrease their sizes with increasing distance from the original ball. The Coulomb explosion suggests a novel method to fabricate nanoscale metal particles with low melting point.

No MeSH data available.


Related in: MedlinePlus