TY - JOUR
T1 - Determination of metallic elements in carbon nanotubes by inductively coupled plasma-optical emission spectrometry
AU - Ishikuro, Mikio
AU - Sato, Yoshihiro
AU - Tohji, Kazuyuki
AU - Wagatsuma, Kazuaki
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2006
Y1 - 2006
N2 - When carbon nanotubes (CNTs) are synthesized, some metal elements are usually employed as catalysts. The CNTs synthesized by this method are contaminated with metals and various forms of carbon and other impurities, which in some cases hinders the detailed characterization of such nanotubes and the assessment of their potential utility. Metallic elements (Fe, Cr, Mo, Al and Ni) in CNTs were determined by inductively coupled plasma-optical emission spectrometry (ICP-OES). Several sample dissolution procedures were investigated. By using an acid dissolution procedure with a mixture of nitric acid and perchloric, or a fusion procedure with potassium hydrogensulfate, a part of the samples was adsorbed on the wall of a flask or a crucible. However, the CNTs could be completely dissolved after the procedures were repeated several times. When the CNTs were incinerated, a part of molybdenum was sublimated. By a microwave-assisted dissolution procedure, CNTs were completely dissolved with a mixture of nitric acid and perchloric acid. The analytical results of the CNTs obtained by ICP-OES had good reproducibility. The contents of metallic elements in CNTs were drastically reduced when they were purified by acids.
AB - When carbon nanotubes (CNTs) are synthesized, some metal elements are usually employed as catalysts. The CNTs synthesized by this method are contaminated with metals and various forms of carbon and other impurities, which in some cases hinders the detailed characterization of such nanotubes and the assessment of their potential utility. Metallic elements (Fe, Cr, Mo, Al and Ni) in CNTs were determined by inductively coupled plasma-optical emission spectrometry (ICP-OES). Several sample dissolution procedures were investigated. By using an acid dissolution procedure with a mixture of nitric acid and perchloric, or a fusion procedure with potassium hydrogensulfate, a part of the samples was adsorbed on the wall of a flask or a crucible. However, the CNTs could be completely dissolved after the procedures were repeated several times. When the CNTs were incinerated, a part of molybdenum was sublimated. By a microwave-assisted dissolution procedure, CNTs were completely dissolved with a mixture of nitric acid and perchloric acid. The analytical results of the CNTs obtained by ICP-OES had good reproducibility. The contents of metallic elements in CNTs were drastically reduced when they were purified by acids.
KW - Carbon nanotubes
KW - ICP-OES
KW - Metal elements
KW - Microwave-assisted dissolution procedure
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U2 - 10.2116/bunsekikagaku.55.117
DO - 10.2116/bunsekikagaku.55.117
M3 - Article
AN - SCOPUS:33646186801
VL - 55
SP - 117
EP - 120
JO - Bunseki Kagaku
JF - Bunseki Kagaku
SN - 0525-1931
IS - 2
ER -