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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 two situations of the Ga particles exploded from the original Ga ball (Fig. 2(a)) covered by silica before (a) and after (b) irradiation for 2904 s.
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f4: The two situations of the Ga particles exploded from the original Ga ball (Fig. 2(a)) covered by silica before (a) and after (b) irradiation for 2904 s.

Mentions: Some Ga particles ejected from the original silica-shelled Ga ball (in Fig. 2(a)) are irradiated again by electron beam, as shown in Fig. 4. The Ga particles shown in Fig. 4(b) were irradiated for 2904 s, but their sizes almost remained (Fig. 4(a)). We can understand the phenomenon as in the 1st situation in Fig. 1(b): when the electron beam irradiates the Ga particles in the centre of carbon film, the positive charges will be neutralized by coming electrons immediately. Thus, no explosion would happen to those Ga particles.


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 two situations of the Ga particles exploded from the original Ga ball (Fig. 2(a)) covered by silica before (a) and after (b) irradiation for 2904 s.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: The two situations of the Ga particles exploded from the original Ga ball (Fig. 2(a)) covered by silica before (a) and after (b) irradiation for 2904 s.
Mentions: Some Ga particles ejected from the original silica-shelled Ga ball (in Fig. 2(a)) are irradiated again by electron beam, as shown in Fig. 4. The Ga particles shown in Fig. 4(b) were irradiated for 2904 s, but their sizes almost remained (Fig. 4(a)). We can understand the phenomenon as in the 1st situation in Fig. 1(b): when the electron beam irradiates the Ga particles in the centre of carbon film, the positive charges will be neutralized by coming electrons immediately. Thus, no explosion would happen to those Ga particles.

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