Sensitivity enhancement of mechanical sensing element via self-assembled ferroelectric ZnO nanoflowers.

Abstract ZnO nanoflower like structure is synthesized by low cost wet chemical method. The growth of flower like morphology is controlled by optimizing the annealing temperature. Structural, vibrational and morphological characterizations are carried out through X-ray diffraction, FTIR, Raman, SEM and TEM analysis respectively. Crystal structure and physical parameters are analyzed and estimated through Williamson Hall energy density models. Further, second harmonic generation of ZnO nanoflowers confirms the existence of non-centrosymmetric nature of the sample. Moreover, the ferroelectricity of the synthesized ZnO nanoflowers is identified by the polarization hysteresis behavior. Typical 80 Hz mechanical detection of the synthesized samples manifests the response of its vibration sensing nature. Therefore, it is established that the synthesized ZnO nanoflowers will be a suitable candidate for the fabrication of sensors like pressure or vibration for industrial applications. Highlights • ZnO nanoflowers is synthesized and its growth is controlled by temperature. • Ferroelectric nature of was explained by the structural defects. • 80 Hz mechanical detection manifests the response of its vibration sensing nature. • Maximum sensitivity of 116 mV/g is achieved. [ABSTRACT FROM AUTHOR]