caa a22 4500 606173390 CHVBK 20210128100732.0 cr unu---uuuuu 210128e20151001xx s 000 0 eng 10.1007/s11244-015-0479-5 doi (NATIONALLICENCE)springer-10.1007/s11244-015-0479-5 The Effect of Al Buffer Layer on the Catalytic Synthesis of Carbon Nanotube Forests [Elektronische Daten] [O. Pitkänen, G. Lorite, G. Shi, A.-R. Rautio, A. Uusimäki, R. Vajtai, G. Tóth, K. Kordás] This study aims to reveal the effect of an Al buffer layer on the catalytic synthesis of carbon nanotube (CNT) forests. Thin films of Al buffer with thicknesses of 2, 5, 10, and 20nm were deposited on copper, brass, stainless steel, Inconel® 600, silicon and alumina substrates under an Fe catalyst layer of 1nm thickness. CNTs were synthesized from acetylene using hydrogen as a reducing gas at 660°C in a low pressure chemical vapor deposition system. Vertically well-aligned CNTs were obtained on all substrates when an Al buffer layer of at least 10nm was applied. The structure of the Al buffer layer and the nanotube forests were studied using scanning electron microscopy, atomic force microscopy and Raman spectroscopy. The effect of the Al buffer layer on the electrical properties of the substrate-buffer-catalyst-nanotube structures was evaluated by current-voltage measurements. Supercapacitor devices constructed from the nanotube forests grown on various types of conductive substrates were also studied. The specific capacitance of the double-layer capacitor electrodes was found to be ~10F/g which is in the same range that we have measured in the absence of an Al buffer layer. Springer Science+Business Media New York, 2015 Metal substrate nationallicence Carbon nanotube growth nationallicence Chemical vapor deposition nationallicence Electrical applications nationallicence Supercapacitors nationallicence Pitkänen O. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut Lorite G. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut Shi G. Department of Material Science and NanoEngineering, Rice University, 77005, Houston, TX, USA aut Rautio A.-R Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut Uusimäki A. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut Vajtai R. Department of Material Science and NanoEngineering, Rice University, 77005, Houston, TX, USA aut Tóth G. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut Kordás K. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 1112-1118 1022-5528 58:14-17<1112 2015 58 11244 https://doi.org/10.1007/s11244-015-0479-5 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11244-015-0479-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Pitkänen O. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut NATIONALLICENCE 700 1- Lorite G. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut NATIONALLICENCE 700 1- Shi G. Department of Material Science and NanoEngineering, Rice University, 77005, Houston, TX, USA aut NATIONALLICENCE 700 1- Rautio A.-R Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut NATIONALLICENCE 700 1- Uusimäki A. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut NATIONALLICENCE 700 1- Vajtai R. Department of Material Science and NanoEngineering, Rice University, 77005, Houston, TX, USA aut NATIONALLICENCE 700 1- Tóth G. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut NATIONALLICENCE 700 1- Kordás K. Microelectronics and Materials Physics Laboratories, Department of Electrical Engineering, University of Oulu, 90570, Oulu, Finland aut NATIONALLICENCE 773 0- Topics in Catalysis Springer US; http://www.springer-ny.com 58/14-17(2015-10-01), 1112-1118 1022-5528 58:14-17<1112 2015 58 11244