Boronnitride (BN) nanotubes having only tens of nanometers in diameter and open tip-ends were uniformly filled with a MgO2-based material. The crystal structures and chemical compositions of the tubes and filling media were analyzed using high-resolution and energy-filtered electron microscopy, electron diffraction, electron energy loss, and energy dispersion X-ray spectroscopy. A low melting point
氮化硼 (BN) 纳米管的直径只有几十纳米,末端开口,用 MgO2 基材料均匀填充。使用高分辨率和能量过滤电子显微镜、电子衍射、电子能量损失和能量色散 X 射线光谱分析了管和填充介质的晶体结构和化学成分。低熔点 (~88°C) 和管内填充物在适度加热下容易分解,例如在电子显微镜中的原位电子辐照期间和/或仅在室温老化期间,可能会产生空间局部化氧从纳米管流出。MgO2 填充材料的独特之处在于稳定的氧气释放速率和较长的释放期限。从而实现了第一个基于纳米管的氧气发生器。
Reactions of boron atoms with molecular oxygen. Infrared spectra of BO, BO<sub>2</sub>, B<sub>2</sub>O<sub>2</sub>, B<sub>2</sub>O<sub>3</sub>, and BO<sup>−</sup><sub>2</sub> in solid argon
作者:Thomas R. Burkholder、Lester Andrews
DOI:10.1063/1.461814
日期:1991.12.15
Boron atoms from Nd:YAG laser ablation of the solid have been codeposited with Ar/O2 samples on a 11±1 K salt window. The product infrared spectrum was dominated by three strong 11B isotopic bands at 1299.3, 1282.8, and 1274.6 cm−1 with 10B counterparts at 1347.6, 1330.7, and 1322.2 cm−1. Oxygen isotopic substitution (16O18O and 18O2 ) confirms the assignment of these strong bands to ν3 of linear BO2. Renner–Teller coupling is evident in the ν2 bending motion. A sharp medium intensity band at 1854.7 has appropriate isotopic ratios for BO, which exhibits a 1862.1 cm−1 gas phase fundamental. A sharp 1931.0 cm−1 band shows isotopic ratios appropriate for another linear BO2 species; correlation with spectra of BO−2 in alkali halide lattices confirms this assignment. A weak 1898.9 cm−1 band grows on annealing and shows isotopic ratios for a BO stretching mode and isotopic splittings for two equivalent B and O atoms, which confirms assignment to B2O2. A weak 2062 cm−1 band grows markedly on annealing and shows isotope shifts appropriate for a terminal–BO group interacting with another oxygen atom; the 2062 cm−1 band is assigned to B2O3 in agreement with earlier work. A strong 1512.3 cm−1 band appeared on annealing; its proximity to the O2 fundamental at 1552 cm−1 and pure oxygen isotopic shift suggest that this absorption is due to a B atom–O2 complex.