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1. (WO2014195415) METHOD FOR PRODUCING MULTI-WALLED CARBON NANOTUBES, MULTI-WALLED CARBON NANOTUBES AND CARBON NANOTUBE POWDER

Pub. No.:    WO/2014/195415    International Application No.:    PCT/EP2014/061722
Publication Date: Fri Dec 12 00:59:59 CET 2014 International Filing Date: Fri Jun 06 01:59:59 CEST 2014
IPC: C01B 31/02
B82Y 40/00
Applicants: COVESTRO DEUTSCHLAND AG
Inventors: HOCKE, Heiko
SCHLÜTER, Oliver Felix-Karl
MICHELE, Volker
MLECZKO, Leslaw
Title: METHOD FOR PRODUCING MULTI-WALLED CARBON NANOTUBES, MULTI-WALLED CARBON NANOTUBES AND CARBON NANOTUBE POWDER
Abstract:
The invention relates to a method for producing multi-walled carbon nanotubes (60, 70, 80, 90, 100), said method comprising the following steps: presenting a substrate (18, 42) made of carbon nanotubes in a moving bed (27, 45) of a reactor (2, 32); introducing a carbonaceous precursor into the moving bed (27, 45); reacting the precursor in the moving bed (27, 45) under suitable processing conditions which effect a graphitic deposition of carbon on the carbon nanotubes of the substrate (18, 42); discharging the carbon nanotubes (60, 70, 80, 90, 100) from the reactor (2, 32). The invention also relates to a multi-walled carbon nanotube (60, 70, 80, 90, 100) having at least one first and one second graphene-like layer (62, 64, 72, 76, 84, 92, 94, 102, 104, 120), wherein the second layer is arranged in the cross-section of the carbon nanotube (60, 70, 80, 90, 100) outside of the first layer, wherein one of the two layers (62, 64, 72, 76, 84, 92, 94, 102, 104, 120) has a first doping and the other of the two layers (62, 64, 72, 76, 84, 92, 94, 102, 104, 120) has a second, different type of doping or is undoped. The invention furthermore relates to a carbon nanotube powder.