The present invention relates to a process for preparing single wall carbon nanotubes (SWCNT) having a diameter d
SWCNT
, which comprises
(i) providing a precursor element which comprises a segment S
SWCNT
of the single wall carbon nanotube,
the segment S
SWCNT
being made of at least one ring formed by ortho-fused benzene rings, and having a first end E1 which is open and a second end E2 which is opposite to the first end E1,
(ii) growing the precursor element by vapour phase reaction with a carbon-source compound on the surface of a metal-containing catalyst, wherein the precursor element is in contact with the surface of the metal-containing catalyst via the open end E1 of the segment S
SWCNT
, and the metal-containing catalyst is in the form of particles having an average diameter d
cat
satisfying the following relation: d
cat
>2×d
SWCNT
or in the form of a continuous film.
                            本发明涉及一种制备直径为dSWCNT的单壁碳纳米管(SWCNT)的方法,包括:(i)提供一个前体元素,该前体元素包括单壁碳纳米管的一段SSWCNT,该段SSWCNT由至少一个由邻位融合苯环形成的环组成,并具有一个开放的第一端E1和一个与第一端E1相对的第二端E2,(ii)通过碳源化合物与
金属催化剂表面的气相反应来生长前体元素,在此过程中,前体元素通过段SSWCNT的开放端E1与
金属催化剂表面接触,
金属催化剂以具有满足以下关系的平均直径dcats的颗粒形式存在:dcat>2×dSWCNT或以连续膜的形式存在。