Linear Optical Susceptibility of Single-Walled Boron Nitride Nanotubes

A simple model based on an effective-mass approximation is developed to describe the dispersion behavior of the linear optical susceptibility χ1 of an array of aligned, identical single-walled boron nitride nanotubes (BNNTs) in the spectral range where interband π-electron transitions dominate. An analytic closed-form expression for χ⁽¹⁾ valid in the low-frequency part of the spectrum is obtained in terms of the band gap Δ_g of BNNTs and the π-electron transfer integral V_ppπ. To the best of our knowledge, the present analytic calculation is the first for such nanotubes.     

氧气辅助法制备氮化硼纳米管

将无定形硼粉于流动氨气(50 mL/min)和不同氧气流量(10、15、20、40 mL/min)的混合气氛下高温(1300℃)处理后, 在不锈钢基片上收集到白色棉花状产物。研究结果表明, 微量的氧气可将硼粉氧化成气态的B₂O₂中间体, 为BN纳米管的生长提供活性较高的硼源。当氧气流量适中时, 所得纳米管的平均直径为80 nm, 长度可达几百微米。氧气流量对BN纳米管的直径和产量影响较大, 纳米管直径随着氧气流量的增大而增大, 产量则出现先升高后降低的趋势。氮化硼纳米管的生长机理属于气-液-固模型。     

Inorganic Nanotubes

Since the first report on the synthesis of inorganic WS₂ nanotubes in 1992, the number of articles on the successful growth of different inorganic nanotubes has increased rapidly, emphasizing the importance of this field for nanotechnology. Although there are some geometrical similarities to carbon nanotubes, inorganic nanotubes are distinguished by important peculiarities, from their growth mechanisms to the physical and chemical properties that are attractive for potential applications. Their structural properties, which are important for such applications, are discussed in this review.     

氮化硼纳米管的制备及其最新进展

综述了氮化硼（BN）纳米管的研究现状及其最新进展,介绍了目前普遍采用的几种制备BN纳米管的工艺方法及其相关的生长机制。同时着重分析比较了用不同制备方法获得的BN纳米管的端帽结构。