Based on core-shell model of considering surface elasticity in a bent piezoelectric nanowire

We discuss the equilibrium piezoelectric potential distribution in a deformed ZnO nanowire based on Core-Shell model. With the size of materials reducing to nanoscale the importance of surface effects presents more significancy, we especially considerd the surface elasticity effection of the ZnO nanowire in our theory. The results derived are 3.3 multiples of the value calculated by Yifan Gao´s model, which agrees well with the Gao and Wang´s statement of the nanowire surface potential increased a factor of 3~4. Meanwhile, the analytical solution produces a result that is available for the experiment measurements, of which the case of the applied force is f_x =5 nN and nanowire radius is R = 25nm, and the caculated value of piezoelectric potential is about 90mV. This voltage is eough to overcome the influence of the inner resistance of nanowire as well as contact resistance between AFM tip and the ZnO nanowire then finally get a voltage about 10mv.