Understanding the synthesis of directly spinnable carbon nanotube forests

摘要: Abstract Carbon nanotube forests that can be spun directly from the growth substrate into pure, highly aligned webs, ribbons or yarn promise novel applications capture strength and other characteristics of this material. The precise conditions for high spinnability over a maximum proportion reactor space are extremely sensitive. roles catalyst, substrate, temperature, gas flow rates, reaction time with acetylene etc. were studied to identify understand key parameters develop robust, scalable process. Using 44 mm (id) reactor, optimum values these variables determined as comprising 2.3 nm thick iron catalyst layer on silicon 50 nm thermal oxide; 670 °C running temperature; 650 sccm helium 34 sccm 20 min. effects deviating optima explored role amorphous carbon deposition clarified.