Pureron Japan Co., Ltd.

Life Technology Research Institute, Inc.

Hong-Xing Wang

Masanori Haba

Akio Hiraki

Nan Jiang

The present invention provides a carbon film that is remarkably excellent in current voltage (IV) characteristics. This is achieved by way of a carbon film structure, two or more carbon film assembly unitsare formed on a substrate. The carbon film assembly unitscomprise: a stem-like carbon filmwhich is made into a film in the shape of a long and thin needle; and a branch-like carbon film clusterwhich is made into a film so as to surround the stem-like carbon filmfrom the halfway to the lower part of this stem-like carbon film. The stem-like carbon filmhas the shape of a long and thin needle having a configuration which has a spiral streak-like step parttowards the distal end at the circumference face of a near tip and in which the radius becomes small as going to the distal end.

Carbon film and carbon film structure

A carbon film of the present invention has an elongated needle shape whose radius decreases toward a tip. The shape is, preferably, a shape in which a field concentration coefficient &#x3b2; in the Fowler-Nordheim equation is expressed by h/r where r denotes the radius in an arbitrary position and h denotes height from the arbitrary position to the tip.

Growing community of inventors

Osaka, Japan

Hong-Xing Wang