کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1662319 | 1517696 | 2007 | 5 صفحه PDF | دانلود رایگان |
Carbon wrapped copper nanowires with outer diameters between 100 and 200 nm and lengths ranging from 500 nm up to 10 μm were synthesized by thermal decomposition of Copper(II)–acetylacetonate in a closed, evacuated quartz ampule. The as-grown material consists of a single crystalline copper core wrapped by amorphous carbon. After a thermal treatment near the melting point of copper the carbon wrapped Cu-cable is transformed into an empty carbon nanotube with a spherical Cu particle attached to the end. Due to nanoscale dimension of this material wires a decrease of the melting point of Cu is observed within the carbon shell. We show that the Cu melts already at a temperature of 800 °C. To the best of our knowledge we report for the first time on the emptying of a metal filled carbon nanotube by a thermal treatment. This process is of great importance, e. g. for the application of such nanostructures as nanopipettes or nanocables. Besides, a reversible “filling-emptying process” can be very useful for certain applications.
Journal: Surface and Coatings Technology - Volume 201, Issues 22–23, 25 September 2007, Pages 9184–9188