Abstract
New magnetic air-stable nanogranular Fe thin films of 10 ± 1.2 nm thickness were prepared onto silicon wafers at 150℃ under inert atmosphere by controlled Chemical Vapor Deposition (CVD) of triiron dodecacarbonyl (Fe3(CO)12). These thin films, composed of sintered elemental Fe nanoparticles of 4.1 ± 0.7 nm diameter, are protected from air oxidation by a very thin carbon layer. The saturation magnetization of these thin Fe coatings was found to be close to that of bulk iron. The electrical resistivity behavior of the ferromagnetic thin films is similar to that of a semiconductor. In the present manuscript, these Fe thin coatings on Si wafers have been used as a catalyst for synthesizing crystalline carbon nanotubes (CNTs), by CVD using ethylene as a carbon precursor.
Highlights
Chemical Vapor Deposition (CVD) is a common technique for synthesizing thin coatings
The electrical resistivity behavior of the ferromagnetic thin films is similar to that of a semiconductor. These Fe thin coatings on Si wafers have been used as a catalyst for synthesizing crystalline carbon nanotubes (CNTs), by CVD using ethylene as a carbon precursor
HRTEM cross section image prepared by the FIB technique as described in the experimental part was used for characterization of the Fe thin films deposited on Si wafers
Summary
Chemical Vapor Deposition (CVD) is a common technique for synthesizing thin coatings. Thin films of transition metals are often used for the synthesis of carbon nanotubes (CNTs) [12] In addition to their very high aspect ratio, their potential for chemical functionalization, and their characteristic electrical, mechanical, and thermal properties, CNTs have many applications including electronic devices (e.g., CNTsbased field effect transistors, interconnects for microprocessors, etc.), [13] electrodes for batteries [14,15] and supercapacitors [16], reinforced composites [17], etc. The synthesis and characterization of new nanogranular Fe/C magnetic conductive thin coatings on Si wafers, by CVD of Fe3(CO) at low temperature under inert atmosphere, are described. These films are composed of sintered elemental Fe nanoparticles protected from air oxidation by a very thin layer of carbon. 218 Synthesis and Characterization of Air-Stable Elemental Fe Thin Films by Chemical Vapor Deposition of Fe3(CO) lysts for synthesizing CNTs has been demonstrated
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