Published: Theoretical Analysis of Nanogenerators with Nanorods for Piezoelectric Energy Harvesting

Our paper entitled “Theoretical Analysis of Nanogenerators with Aligned Nanorods for Piezoelectric Energy Harvesting” has been published in Sens. Mater. We theoretically analyzed nanogenerators with aligned piezoelectric nanorods. It was shown that for the same piezoelectric materials, using a rod-shaped unit will increase the piezoelectric constant d33 by 33% compared with using a film, owing to less substrate clamping. In addition, for the case of applying normal force, the aligned nanorod array can generate an output power one or more orders of magnitude higher than films within the same volume. This sort of nanogenerator will play an important role in the integration with miniaturized sensors in the off-resonant mode.

Citation: Sens. Mater. 31, 3669-3679 (2019).

Published: Large impact of strain on electro-optic effect in (Ba, Sr)TiO3 films: experiment and theoretical comparison

Our paper entitled “Large Impact of Strain on the Electro-optic Effect in (Ba, Sr)TiO3 Thin Films: Experiment and Theoretical Comparison” has been published in Appl. Phys. Lett. We experimentally clarified that the EO properties of compressively strained BST thin films are enhanced toward the phase transition temperature modified by the strain. Although the measured EO coefficient rc was less than that theoretically predicted, the experimentally observed strain effect on the EO properties is in good qualitative agreement.

This paper was was selected as a featured article.

Citation: Appl. Phys. Lett. 115, 092901 (2019).

Published: Theoretical model of electro-optic effect in strained c-domain (Ba, Sr)TiO3 films

Our paper entitled “Theoretical Estimation of the Linear Electro-optic Effect in Compressively Strained c-domain (Ba, Sr)TiO3 Thin Films using a Phenomenological Thermodynamic Model” has been published in J. Ceram. Soc. Jpn. To estimate the EO coefficients, we considered not only the intrinsic EO effect but also the elasto-optic effect by converse piezoelectric response. We found that the EOresponse is mostly determined by the difference in temperature from the ferroelectric-to-paraelectric phase transition boundary modified by the strain.

Citation: J. Ceram. Soc. Jpn. 127, 348-352 (2019).