  Based on the non-equilibrium molecular dynamics simulations, we have studied
the thermal conductivities of a novel ultra-thin one-dimensional carbon
nanomaterial - diamond nanothread (DNT). Unlike single-wall carbon nanotube
(CNT), the existence of the Stone-Wales transformations in DNT endows it with
richer thermal transport characteristics. There is a transition from
wave-dominated to particle-dominated transport region, which depends on the
length of poly-benzene rings. However, independent of the transport region,
strong length dependence in thermal conductivity is observed in DNTs with
different lengths of poly-benzene ring. The distinctive SW characteristic in
DNT provides more degrees of freedom to tune the thermal conductivity not found
in the homogeneous structure of CNT. Therefore, DNT is an ideal platform to
investigate various thermal transport mechanisms at the nanoscale. Its high
tunability raises the potential to design DNTs for different applications, such
as thermal connection and temperature management.
