File Name : figure s1.eps

Caption : figure s1 adhesion energy calculated as a function of the (a) total vacancy concentration <sub>total</sub> and (b) vacancy concentration ratio between two nanoribbons <sub>top</sub>/<sub>bottom</sub>.

File Name : figure s2.eps

Caption : figure s2. schematic of the bn nanoribbon after relaxation in (a) front view and (b) side view. schematic of the bn nanoribbon without boundary atoms after relaxation in (c) front view and (d) side view.

File Name : figure s3.eps

Caption : figure s3. comparing the thermal conductivity of pristine bnnr with the results in ref. [7].