−3  0  3  6  9  12  15  0  300  600  900  1200 (10 −6 K −1 ) T (K) [110] [111] [100] −10 −5  0  5  10  0  300  600  900  1200 (10 −6 K −1 ) T (K) =0.25 =1.0 =1.3 12 FIG. 5: (Color online) CTE depends on T , in [111] SiNW with different structure ratio γ = length/diameter . FIG. 4: (Color online) CTE of SiNW in three directions [100], [110], and [111].