It can be see that ZT for all specimens has similar temperature behavior, i.e., it increases gradually with increasing temperature, and after reaching a maximum value ZT decreases gradually with further increasing temperature. Moreover, ZT for all the composite specimens is larger than that of the Bi2Te2.7Se0.3 matrix. However, ZT for the composite specimens increases with increasing f till f = 0.4 wt.%, and then ZT decreas with decreasing f.