Extreme nanowires (ENs) represent the ultimate class of crystals: They are the smallest possible periodic materials. With atom-wide motifs repeated in one dimension (1D), they offer a privileged perspective into the Physics and Chemistry of low-dimensional systems. Single-walled carbon nanotubes (SWCNTs) provide ideal environments for the creation of such materials. Here we present a comprehensive study of Te ENs encapsulated inside ultra- narrow SWCNTs with diameters between 0.7 nm and 1.1 nm. We combine state-of-the-art imaging techniques and 1D-adapted ab initio structure prediction to treat both confinement and periodicity effects. The studied Te ENs adopt a variety of structures, exhibiting a true 1D realisation of a Peierls structural distortion and transition from metallic to insulating behaviour as a function of encapsulating diameter. We analyse the mechanical stability of the encapsulated ENs and show that nanoconfinement is not only a useful means to produce ENs, but may actually be necessary, in some cases, to prevent them from disintegrating. The ability to control functional properties of these ENs with confinement has numerous applications in future device technologies, and we anticipate that our study will set the basic paradigm to be adopted in the characterisation and understanding of such systems.
First-passage theory of exciton population loss in single-walled carbon nanotubes reveals micron-scale intrinsic diffusion lengths
一维晶体具有长程平移不变性，表现为长的激子扩散长度，但这种内在性质往往被环境扰动所掩盖。我们使用第一次通过的方法来模拟单壁碳纳米管（SWCNT）激子动力学（包括激子-激子湮灭和末端效应），并将其与连续波和多脉冲超快激发实验的结果进行比较，以提取内在的SWCNT特性。悬浮的SWCNT中的激子经历宏观扩散长度，在SWCNT长度的量级上，（1.3-4.7 μ m），与封装的样品形成鲜明对比。对于这些原始样品，我们的模型揭示了SWCNT的固有寿命（350-750 ps）、扩散常数（130-350 cm ^2/s）和吸收截面（2.1-3.6 X 10^-17 cm ^2/atom），这些都是之前报道的最高值。
Modified silicone rubbers for fabrication and contacting of flexible suspended membranes of n-/p-GaP nanowires with single-walled carbon nanotube transparent contact
High Pressure Induced Binding Between Linear Carbon Chains and Nanotubes
最近的研究单壁碳纳米管（CNTs）在水介质中的显示，水可以显着影响管的机械性能。碳纳米管在静水压力下可以保持其弹性性能高达大的压力值，同时表现出优异的耐机械负荷。实验观察到，当受到高静水压值时，具有封装的线性碳链（LCC）的CNT在它们的一些振动频率中呈现不可逆的红移。为了解决这一现象的原因，我们进行了完全原子反应（ReaxFF）分子动力学（MD）模拟模型结构模仿实验条件。我们已经考虑了有限和无限（循环边界条件）的情况下，碳纳米管填充LCC（LCC内碳纳米管）的不同长度（从9到40个原子）。我们的研究结果表明，增加静水压力会导致CNT变形的不均匀的方式，由于LCC的存在。LCC-CNT界面区域表现出凸曲率，这导致更多的反应位点，从而有利于链和纳米管之间形成共价化学键。该过程是不可逆的，即使在释放外部压力后，新形成的键仍继续存在，并导致链振动模式从1850 cm $^{-1}$不可逆地红移至1500 cm。
