Limits...
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 morphologies and chemical information of the silica covered microscale Ga ball before and after irradiation.(a) TEM image of Ga ball before irradiation. (b–e) After irradiation of ~400 s, 1524 s, 3884 s and 6534 s, respectively. (f) The EDS spectra of the silica-shelled microscale Ga ball before irradiation.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4477366&req=5

f2: The morphologies and chemical information of the silica covered microscale Ga ball before and after irradiation.(a) TEM image of Ga ball before irradiation. (b–e) After irradiation of ~400 s, 1524 s, 3884 s and 6534 s, respectively. (f) The EDS spectra of the silica-shelled microscale Ga ball before irradiation.

Mentions: A Ga ball covered by silica shell before irradiation is shown in Fig. 2(a). The radius of the ball reduced gradually from ~2.1 μm to ~1.8 μm with increasing irradiation time, and some small Ga particles were ejected from the surface of the original ball and distributed around the ball as shown in Fig. 2(b–e). The diameter of the ejected Ga particles kept increasing until the explosion stopped. It is a Coulomb explosion from the ball surface due to positive charge accumulation on the Ga ball surface. According to the above estimation, the explosion can occur at the situation that only more than 0.310 ppm of total Ga atoms in the microball losing 2 electrons per atom since the radius is ~2 μm. The EDS spectra in Fig. 2(f) are collected from the nanoscale Ga ball covered by silica in Fig. 2(a) before explosion. This result indicates that the original Ga ball contains silicon and oxygen in the form of Ga and Si oxides on the surface of the Ga ball.


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 morphologies and chemical information of the silica covered microscale Ga ball before and after irradiation.(a) TEM image of Ga ball before irradiation. (b–e) After irradiation of ~400 s, 1524 s, 3884 s and 6534 s, respectively. (f) The EDS spectra of the silica-shelled microscale Ga ball before irradiation.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f2: The morphologies and chemical information of the silica covered microscale Ga ball before and after irradiation.(a) TEM image of Ga ball before irradiation. (b–e) After irradiation of ~400 s, 1524 s, 3884 s and 6534 s, respectively. (f) The EDS spectra of the silica-shelled microscale Ga ball before irradiation.
Mentions: A Ga ball covered by silica shell before irradiation is shown in Fig. 2(a). The radius of the ball reduced gradually from ~2.1 μm to ~1.8 μm with increasing irradiation time, and some small Ga particles were ejected from the surface of the original ball and distributed around the ball as shown in Fig. 2(b–e). The diameter of the ejected Ga particles kept increasing until the explosion stopped. It is a Coulomb explosion from the ball surface due to positive charge accumulation on the Ga ball surface. According to the above estimation, the explosion can occur at the situation that only more than 0.310 ppm of total Ga atoms in the microball losing 2 electrons per atom since the radius is ~2 μm. The EDS spectra in Fig. 2(f) are collected from the nanoscale Ga ball covered by silica in Fig. 2(a) before explosion. This result indicates that the original Ga ball contains silicon and oxygen in the form of Ga and Si oxides on the surface of the Ga ball.

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