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Research Development Corporation of Japan

Kabushiki Kaisha Toshiba

Bing She Xu

Shun-ichiro Tanaka

After an ultrafine particle is disposed on a giant fullerene by driving the ultrafine particle using an electron beam, the ultrafine particle is enclosed in a core hollow portion of the giant fullerene, by contracting the giant fullerene with the electron beam irradiation. Or a metal ultrafine particle composed of an active metal is enclosed in the core hollow portion of the giant fullerene, by irradiating a high energy beam such as the electron beam to an amorphous carbon including the active metal to form the giant fullerene in an irradiated portion, and by contracting the giant fullerene with the irradiation of the high energy beam.

Ultrafine particle enclosing fullerene and production method thereof

After an ultrafine particle is disposed on a giant fullerene by driving the ultrafine particle 1 using an electron beam, the ultrafine particle is enclosed in a core hollow portion of the giant fullerene, by contracting the giant fullerene with the electron beam irradiation. Or a metal ultrafine particle composed of an active metal is enclosed in the core hollow portion of the giant fullerene, by irradiating a high energy beam such as the electron beam to an amorphous carbon under existing of the active metal to form the giant fullerene in an irradiated portion, and by contracting the giant fullerene with the irradiation of the high energy beam such as the electron beam.

An electron beam of more than 1.times.10.sup.19 e/cm.sup.2 .multidot.sec is irradiated to metastable metal oxide particles such as .theta.-Al.sub.2 O.sub.3 particles or the like disposed on an amorphous carbon film. A phase transformation or the like of the metastable metal oxide particles is occurred by the electron beam irradiation. Thus, stable metal oxide ultrafine particles such as an .alpha.-Al.sub.2 O.sub.3 ultrafine particle 2 whose diameter is more tiny than the metastable metal oxide particles used, and a metal ultrafine particle composed of an oxide such as Al ultrafine particles are produced.

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Yokohama, Japan

Bing She Xu