论文标题
在气相中产生的纳米线的坚硬板
Tough sheets of nanowires produced floating in the gas phase
论文作者
论文摘要
将纳米结构的构件组装到网络材料中，可以解锁与整体固体无法访问的宏观特性，特别是韧性和对电化学合金的耐受性。据报道，一种方法是悬浮在气相中的硅纳米线（SINW）的大规模连续合成，并将其直接组装成宏观床单。通过浮动催化剂化学蒸气沉积使用金纳米颗粒的浮动催化剂化学蒸气沉积，消除了对底物的需求，增加了500倍，达到1.4 $ $ m s $^{ - 1} $，并导致很长的sinws。高纵横比（$> $> $ 210）和气相中的大量SINW（1.5 x 107 cm $^{ - 3} $）可以形成唯一由渗透性的sinw组成的宏观固体，例如免费的床单和连续的Metre Metre Metre Metre Metre Metre long sinw胶带。小直径SINWS的样品样品（$ <$ 25 nm）结合了弯曲的特殊柔韧性，拉伸延展性约3％，韧性高于SI基阳极（裂缝能量0.18 $ \ pm $ 0.1 J g $^$^$^{ - 1} $）。该合成和组装过程应适用于几乎任何一维无机纳米材料，可通过热化学方法生产。
Assembling nanostructured building blocks into network materials unlocks macroscopic properties inaccessible with monolithic solids, notably toughness and tolerance to electrochemical alloying. A method is reported for large-scale, continuous synthesis of silicon nanowires (SiNWs) suspended in the gas phase and their direct assembly into macroscopic sheets. Performing gas-phase growth of SiNWs through floating catalyst chemical vapor deposition using an aerosol of gold nanoparticles eliminates the need for substrates, increasing the growth rate by a factor of 500, reaching 1.4 $μ$m s$^{-1}$ and leading to very long SiNWs. The combined high aspect ratio ($>$210) and large concentration of SiNWs in the gas-phase (1.5 x 107 cm$^{-3}$) enable the formation of macroscopic solids solely composed of percolated SiNWs, such as free-standing sheets and continuous metre-long SiNW tapes. Sheet samples of small diameter SiNWs ($<$25 nm) combine extraordinary flexibility in bending, tensile ductility around 3%, and over 50-fold higher toughness than Si-based anodes (fracture energy 0.18 $\pm$ 0.1 J g$^{-1}$). This synthesis and assembly process should be applicable to virtually any one-dimensional inorganic nanomaterial producible by thermochemical methods.
