The design of two-degree-of-freedom vibration energy harvesters is necessary to enable the vibration energyharvesting for signals with two dominant vibration frequencies. This paper presents an analytical method for thedesign of piezoelectric cantilevers over two resonant frequencies. A two-degree of freedom (2-DOF) analyticalmodel is proposed and ...
Published in Smart Materials and Structures
Piezoelectric vibration isolation and energy harvesting applications have been extensively studied in the literature. The studies include linear and nonlinear approaches. Linear methods are simpler but possess inherent limitations. On the other hand, nonlinear ones could perform better over a broader operating frequency range. Nonlinearity can be i...
Published in Measurement Science Review
In recent years, Piezoelectric Transformers (PTs) have become a great success due to their excellent properties, especially in applications requiring high voltage. The Rosen-type PT is well known for this performance, as its voltage gain at the resonant frequency can reach few thousands. However, the high output impedance of this device can make an...
Published in Physica Scripta
As is well known, relaxor dielectrics are characterized by high energy storage efficiency (η), while high recoverable energy storage density (Wrec) can be achieved by anti-ferroelectric ceramics. Herein, our approach is to find relaxor- anti-ferroelectric coexistence phases of (Bi0.5Na0.5)TiO3- BaTiO3 ceramics for achieving high performance in ener...
Published in Angewandte Chemie (International ed. in English)
Within the burgeoning field of electronic materials, B-N Lewis acid-base pairs, distinguished by their partial charge distribution across boron and nitrogen centers, represent an underexplored class with significant potential. These materials exhibit inherent dipoles and are excellent candidates for ferroelectricity. However, the challenge lies in ...
This work focusses on the study of piezoelectric properties of horizontal ZnO semiconducting Nanowires (NWs) placed in randomly oriented network structure leading to the formation of Nanonets (NN). These Nanowires were vertically grown by hydrothermal synthesis method which were thereafter transferred onto desired substrate for device fabrication t...
The concept of hybrid SAW/BAW (HSB) resonators was introduced in 2013. It is based on a periodic arrangement of piezoelectric transducers on a substrate, combining the ad-vantages of bulk- and surface-wave devices. An initial study on AlN optimized two reso-nance modes achieving electromechanical coupling coefficients of 1% and 1.8% respectively at...
Piezo- and pyroelectric materials are of interest, for example, for energy harvesting applications, for the development of tactile sensors, as well as neuromorphic computing. This study reports the observation of pyro- and piezoelectricity in thin surface-attached polymer brushes containing zwitterionic and electrolytic side groups that are prepare...
Published in Colloids and surfaces. B, Biointerfaces
Bismuth ferrite (BiFeO3), a perovskite-type oxide, possesses unique morphology and multiferroicity, rendering it highly versatile for various applications. Recent investigations have demonstrated that BiFeO3 exhibits enhanced Fenton-like and photocatalytic behaviors, coupled with its piezoelectric/ferroelectric properties. BiFeO3 can catalytically ...
