Structural inhomogeneity and piezoelectric enhancement in ZnO nanobelts
In this work, piezoelectricity of individual ZnO nanobelts grown along the [0∈1∈ī∈0] direction is studied using piezoresponse force microscopy (PFM). It is found that the effective piezoelectric coefficient of these NBs, d 33eff, is increasing from 2.7 pm/V at 30 kHz to 44 pm/V at 150 kHz. The results were explained by the Debye model, where structural inhomogeneity in our NBs was shown to be responsible for piezoelectric enhancement. © 2012 Springer-Verlag.