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III-A Synthesis and Characterization of Exotic Molecule Based Nano-Crystals of Metal Acetylides: Toward Carbon Encapsulated Metal Dot Array, Metal Nano-Networks and Metal-Carbon Hybrid Systems
| Content Provider | Semantic Scholar |
|---|---|
| Author | Sang-Yeon Bonghyun Kang Heun-Kag Kang, Dong-Eun |
| Copyright Year | 2006 |
| Abstract | Various methods have been suggested for metallic and semiconductive nanowire production, template based synthesis, vapor-liquid-solid growth, solutionliquid-solid process, oxide-assisted growth and so on. Above all, the production using a highly anisotropic crystal can be regarded as due to self-assembly of small molecules or atoms to a nanowire. The self-assembly method has potential advantage of relatively low cost, high purity, and large-scale production. However, only limited materials have anisotropic properties, for example, molybdenum chalcogenides, selenium, and tellurium. Besides, it is very hard to produce thin nanowires by only highly anisotropic properties. Here we report a new compound having a highly anisotropic crystal structure. Copper acetylide (C2Cu2) molecules self-assemble into ultra thin nanowires under an extremely slow nucleation condition. Moreover, annealing of the C2Cu2 nanowires converts to copper nanocables encapsulated in carbon outer layers. The copper nanocable core is extremely thin, in which only 8 Cu atoms can line up in the diameter. One of the merits of self-assembly nanowire production is an extremely simple procedure of just preparing only a building block. The C2Cu2 nanowire can be also generated facilely. Figure 1 shows a scanning electron microscopy (SEM) image of C2Cu2 products on silicon substrates, where the C2Cu2 suspension in methanol has been dropped onto and air-dried. Nanowire morphology was observed when the C2H2 exposing rate was kept extremely slow (0.05 mL/min). Although C2Cu2 was synthesized by chemical reaction of gram-order production in a flask, microscopic shape of the product is a nanoscale needle-like crystal. This indicates that C2Cu2 molecules aggregate and self-assemble into nanowire morphology in an aqueous solution. On the contrary to the successful production of nanowires, a fast exposing rate of C2H2 gas gave amorphous products. The key step of self-assembling for the nano-structure is just only the control of the nucleation rate of acetylide molecules. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://www.ims.ac.jp/en/about/publication/ann_rev_2005/ar200531.pdf |
| Alternate Webpage(s) | https://www.ims.ac.jp/en/about/publication/ann_rev_2006/ar200630.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
