High-Yield Synthesis of Helical Carbon Nanofibers Using Iron Oxide Fine Powder as a Catalyst

Autor: Yoshiyuki Suda, Koji Maruyama, Tetsuo Iida, Hirofumi Takikawa, Hitoshi Ue, Kazuki Shimizu, Yoshito Umeda
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Crystals, Vol 5, Iss 1, Pp 47-60 (2015)
Druh dokumentu: article
ISSN: 2073-4352
DOI: 10.3390/cryst5010047
Popis: Carbon nanocoil (CNC), which is synthesized by a catalytic chemical vapor deposition (CCVD) method, has a coil diameter of 300–900 nm and a length of several tens of μm. Although it is very small, CNC is predicted to have a high mechanical strength and hence is expected to have a use in nanodevices such as electromagnetic wave absorbers and field emitters. For nanodevice applications, it is necessary to synthesize CNC in high yield and purity. In this study, we improved the conditions of catalytic layer formation and CCVD. Using optimized CVD conditions, a CNC layer with a thickness of >40 μm was grown from a SnO2/Fe2O3/SnO2 catalyst on a substrate, and its purity increased to 81% ± 2%.
Databáze: Directory of Open Access Journals