Patent ID: 8178203
Filing Date: 2012-05-15
Classification: B82Y,C01B,Y10S,Y10T

Abstract:
1. An aligned single-walled CNT aggregate comprising a substrate, fine particles of iron catalyst with a density of 1×10 11 to 1×10 14 /cm 2 disposed on an alumina co-catalyst above the substrate, and a plurality of single-walled CNTs grown from the fine particles of the iron catalyst, in which the plurality of single-walled CNTs have a specific surface area of 600 m 2 /g to 2600 m 2 /g, and a weight density from 0.002 g/cm 3 to 0.2 g/cm 3 , and the alignment degree is defined by at least one of the following conditions: (1) in a case where X-rays are incident from a first direction parallel to the longitudinal direction of CNT and a second direction perpendicular to the first direction to measure the X-ray diffraction intensity (θ-2θ method), a θ angle and a reflection direction where the reflection intensity from the second direction is larger than the reflection intensity from the first direction are present, and a θ angle and a reflection direction where the reflection intensity from the first direction is larger than the reflection intensity from the second direction are present, (2) in a case where the X-ray refraction intensity is measured (Laue method) by 2-dimensional diffraction pattern images obtained by incidence of X-rays in the direction perpendicular to the longitudinal direction of CNT, a diffraction peak pattern showing the presence of the anisotropy appears, and (3) Herman's orientation factor is greater than 0 and smaller than 1 by using an X-ray diffraction intensity obtained by the θ-2θ method or the Laue method.