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wdxyjh

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As semiconductors with a one-dimensional nanostructure have many potential applications in nanoelectronic and microelectronic devices, systematic and in-depth investigations of semiconductor nanowires with various free-space structures have been carried out and many significant results obtained.6-11 However, research on semiconductor nanowires formed inside nanotubes is rarely reported.12,13 Due to the effects of size and surface reconstruction, semiconductor nanowires in free space display significantly different behavior from the bulk material, including quantum confinement effects and single electron transport effects. However, they are also subject to oxidization, which changes their behavior. As the copper atoms tend to undergo sp3 hybridization and form covalent bonds, pure semiconductor nanowires in free space are instable, especially when they have small diameters. Coating the CuNWs with a layer of inert atoms, such as a constitutionally stable nanotube with anti-oxidation properties, can effectively prevent the oxidation of CuNWs and inhibit sp3 hybridization of the copper atoms and the formation of covalent bonds, thus making the CuNWs more stable. The composite structure may also have better physical properties, and could have important applications in micro-nanoelectronics.
CNTs begin to oxidize at about 400℃,14-16 which restricts their technological application at high temperatures. The structure of boron-nitride nanotubes (BNNT) is very similar to that of CNTs, and they exhibit many similar physical and chemical properties.14,17,18 However, compared with CNTs, BNNTs have better mechanical properties at high temperatures, thermal stability, and oxidation resistance.19 BNNTs shells thus provide an effective barrier against oxidation. Thus, the oxidation degradation of CuNWs could be reduced by coating them with BNNTs and their long-term stability improved. BNNTs are of potential use in nanoscale electronic devices and nanostructure ceramic materials due to their stability at high temperatures and high electronic insulation in air.20–25 Hence, CuNW@BNNTs are also likely to have significant advantages in a range of technological applications.
The similar monoatom chain-filled nanotubes have already been founded and studied for CNTs. Wang et al. calculated the buckling strain of CNTs filled with metal atoms (Ni, Cu and Pt) and found that as in the case of gases, critical strain of the filled CNT is also larger than that of the hollow CNT.26 More recently, Soldano and Mariscal studied the effect of the enclosed Fe, with structure of fcc or bcc, on mechanical properties of CNTs using a recent parameterization of the modified embedded atom model.27 It was reported that AuNWs will form helical structures when Au atoms are confined in CNTs.2,28 which is totally different from its bulk counterpart. The formation of helical AuNWs inside CNTs implies such structured AuNW@CNTs composites may possess novel mechanical properties that are different from those of gas or fullerene-filled CNTs. The research reported in this paper focuses on coaxial CuNW@BN(5,5) and CuNW@C(5,5) nanotubes. These structures are formed by optimizing BN(5,5) and BN(0,10) nanotubes filled with a certain number of copper atoms. The structural properties of the tubes are analyzed from radial distribution function (RDF) data and the deformation electron density. The compressive properties of the nanotubes are also investigated by comparing and analyzing the deformation and system energy of the optimized structures under different axial compressive strains.
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1楼 2010-12-29 13:16:41
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gary8812

铁杆木虫 (著名写手)
wdxyjh(金币+5): 2010-12-31 14:51:33
However, they are also subject to oxidization, which changes their behavior. As the copper atoms tend to undergo sp3 hybridization and form covalent bonds, pure semiconductor nanowires in free space are instable, especially when they have small diameters. Coating the CuNWs with a layer of inert atoms, such as a constitutionally stable nanotube with anti-oxidation properties, can effectively prevent the oxidation of CuNWs and inhibit sp3 hybridization of the copper atoms and the formation of covalent bonds, thus making the CuNWs more stable. The composite structure may also have better physical properties, and could have important applications in micro-nanoelectronics.


然而，他们也会被氧化，从而改变他们的性质。由于铜原子趋于sp3杂化，形成共价键，在自由空间的纯半导体纳米线是不稳定的，尤其是当他们尺寸比较小时。如果在铜纳米线外包覆一层惰性原子，例如持续稳定的抗氧化性的纳米管，那么就能有效防止铜纳米线氧化，抑制铜原子 sp3杂化及共价键的形成，从而使铜纳米线更稳定。这种复合结构也有更好的物理性能，并在微纳米电子方面有着重要的应用。
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4楼2010-12-29 19:46:24
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gary8812

铁杆木虫 (著名写手)
wdxyjh(金币+5, 翻译EPI+1): 2010-12-31 14:51:05
As semiconductors with a one-dimensional nanostructure have many potential applications in nanoelectronic and microelectronic devices, systematic and in-depth investigations of semiconductor nanowires with various free-space structures have been carried out and many significant results obtained.
由于一维纳米结构的半导体在微纳器件中有很多潜在的应用，我们系统深入地研究了多种自由空间结构的半导体纳米线，并取得了比较重大的成果。
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2楼2010-12-29 14:08:51
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gary8812

铁杆木虫 (著名写手)
wdxyjh(金币+5): 2010-12-31 14:51:19
However, research on semiconductor nanowires formed inside nanotubes is rarely reported.12,13 Due to the effects of size and surface reconstruction, semiconductor nanowires in free space display significantly different behavior from the bulk material, including quantum confinement effects and single electron transport effects.
可是，在纳米管里形成的半导体纳米线很少有报道。由于尺寸效应和表面重构，半导体纳米线在自由空间显示与块体材料很大不同的性能，包括量子限域效应和单电子传输效应。
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3楼2010-12-29 14:22:53
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gary8812

铁杆木虫 (著名写手)
wdxyjh(金币+5): 2010-12-31 14:52:10
CNTs begin to oxidize at about 400℃,14-16 which restricts their technological application at high temperatures. The structure of boron-nitride nanotubes (BNNT) is very similar to that of CNTs, and they exhibit many similar physical and chemical properties.14,17,18 However, compared with CNTs, BNNTs have better mechanical properties at high temperatures, thermal stability, and oxidation resistance.19 BNNTs shells thus provide an effective barrier against oxidation. Thus, the oxidation degradation of CuNWs could be reduced by coating them with BNNTs and their long-term stability improved. BNNTs are of potential use in nanoscale electronic devices and nanostructure ceramic materials due to their stability at high temperatures and high electronic insulation in air.20–25 Hence, CuNW@BNNTs are also likely to have significant advantages in a range of technological applications.

碳纳米管在400℃开始氧化, 这限制了它们在高温下的技术应用。硼氮纳米管（BNNT）结构与碳纳米管结果很相似。他们表现出许多类似的物理和化学性质。然而，与碳纳米管比较，硼氮纳米管在高温下有更好的力学性能，更好的热稳定性和抗氧化性。因而，硼氮纳米管壳提供一个有效的抗氧化屏障。因此，包覆了硼氮纳米管的CuNWs可以减少氧化，长期稳定性得到改善。 BNNTs由于高温稳定和空气中高绝缘，使得在纳米电子器件和纳米结构陶瓷材料方面有潜在的使用前景。因此，CuNW@ BNNTs也可能技术应用中有着显著的优势。
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5楼2010-12-29 20:01:45
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