scholarly journals Local Piezoelectric Properties of Doped Biomolecular Crystals

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4922
Author(s):  
Andrei Kholkin ◽  
Denis Alikin ◽  
Vladimir Shur ◽  
Shiri Dishon ◽  
David Ehre ◽  
...  
Keyword(s):  
Guest Molecule ◽  
Piezoelectric Properties ◽  
Dipole Moments ◽  
Mechanical Strain ◽  
Piezoresponse Force Microscopy ◽  
Piezoelectric Response ◽  
Force Microscopy ◽  
Highly Sensitive ◽  
Molecule Interactions ◽  
Co Doped

Piezoelectricity is the ability of certain crystals to generate mechanical strain proportional to an external electric field. Though many biomolecular crystals contain polar molecules, they are frequently centrosymmetric, signifying that the dipole moments of constituent molecules cancel each other. However, piezoelectricity can be induced by stereospecific doping leading to symmetry reduction. Here, we applied piezoresponse force microscopy (PFM), highly sensitive to local piezoelectricity, to characterize (01¯0) faces of a popular biomolecular material, α-glycine, doped with other amino acids such as L-alanine and L-threonine as well as co-doped with both. We show that, while apparent vertical piezoresponse is prone to parasitic electrostatic effects, shear piezoelectric activity is strongly affected by doping. Undoped α-glycine shows no shear piezoelectric response at all. The shear response of the L-alanine doped crystals is much larger than those of the L-threonine doped crystals and co-doped crystals. These observations are rationalized in terms of host–guest molecule interactions.

The Microstructure and Local Piezoelectric Response in Polymer Nanocomposites with Different Ferroelectric Crystalline Additions

2013 ◽  
Vol 1556 ◽  
Author(s):  
Dmitry A. Kiselev ◽  
Mikhail D. Malinkovich ◽  
Yuriy N. Parkhomenko ◽  
Alexandr V. Solnyshkin ◽  
Alexey A. Bogomolov ◽  
...  
Keyword(s):  
Electric Fields ◽  
Piezoelectric Properties ◽  
Piezoresponse Force Microscopy ◽  
Piezoelectric Response ◽  
Relaxation Dynamics ◽  
Force Microscopy ◽  
Nanostructured Polymer ◽  
Ferroelectric Domains ◽  
Resolution Imaging ◽  
Local Polarization

ABSTRACTIn this work, we report on local ferroelectric and piezoelectric properties of nanostructured polymer composites P(VDF-TrFE)+x(Ba,Pb)(Zr,Ti)O3 (x = 0 - 50 %). High-resolution imaging of ferroelectric domains, local polarization switching, and polarization relaxation dynamics were studied by piezoresponse force microscopy. In particular, we found that (Ba,Pb)(Zr,Ti)O3 inclusions usually show a strong unipolar piezoresponse signal, as compared to the polymer matrix. By scanning under high dc voltage the films can be polarized uniformly under both positive and negative electric fields. Stability of the polarized state is discussed.

Characterization of Nanomechanical, Ferroelectric, and Piezoelectric Properties by Nanoindentation and Piezoresponse Force Microscopy of PbTiO3 Thin Films

2013 ◽  
Vol 52 (40) ◽  
pp. 14328-14334 ◽  
Author(s):  
Juan Ramos-Cano ◽  
Mario Miki-Yoshida ◽  
André Marino Gonçalves ◽  
José Antônio Eiras ◽  
Jesús González-Hernández ◽  
...  
Keyword(s):  
Thin Films ◽  
Piezoelectric Properties ◽  
Piezoresponse Force Microscopy ◽  
Force Microscopy ◽  
Ferroelectric And Piezoelectric Properties

FLEXOELECTRIC COMPOSITE — A NEW PROSPECT FOR LEAD-FREE PIEZOELECTRICS

2010 ◽  
Vol 03 (01) ◽  
pp. 79-81 ◽  
Author(s):  
BAOJIN CHU ◽  
WENYI ZHU ◽  
NAN LI ◽  
L. ERIC CROSS
Keyword(s):  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Physical Phenomenon ◽  
Mechanical Strain ◽  
Dielectric Materials ◽  
Electric Polarization ◽  
Lead Free ◽  
Piezoelectric Response ◽  
Bst Ceramics ◽  
Better Than

Flexoelectricity describes the physical phenomenon of the generation of electric polarization from mechanical strain gradient in solid insulators. In common dielectric materials, the flexoelectric coefficient is trivially small ~10-10 C/m. In Ba(Sr,Ti)O 3 (BST) ceramics, flexoelectric coefficient up to 10-4 C/m was observed. Such high coefficient makes it possible to design high piezoelectric response flexoelectric composites. In this letter, we will demonstrate that the newly designed flexoelectric composites could have piezoelectric properties better than conventional piezoelectric materials.

scholarly journals Piezoelectricity in hafnia

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sangita Dutta ◽  
Pratyush Buragohain ◽  
Sebastjan Glinsek ◽  
Claudia Richter ◽  
Hugo Aramberri ◽  
...  
Keyword(s):  
First Principles ◽  
Piezoelectric Effect ◽  
Piezoresponse Force Microscopy ◽  
Perovskite Oxides ◽  
Ferroelectric Material ◽  
Active Oxygen ◽  
Piezoelectric Response ◽  
First Principles Calculations ◽  
Force Microscopy ◽  
Epitaxial Strain

AbstractBecause of its compatibility with semiconductor-based technologies, hafnia (HfO2) is today’s most promising ferroelectric material for applications in electronics. Yet, knowledge on the ferroic and electromechanical response properties of this all-important compound is still lacking. Interestingly, HfO2 has recently been predicted to display a negative longitudinal piezoelectric effect, which sets it apart from classic ferroelectrics (e.g., perovskite oxides like PbTiO3) and is reminiscent of the behavior of some organic compounds. The present work corroborates this behavior, by first-principles calculations and an experimental investigation of HfO2 thin films using piezoresponse force microscopy. Further, the simulations show how the chemical coordination of the active oxygen atoms is responsible for the negative longitudinal piezoelectric effect. Building on these insights, it is predicted that, by controlling the environment of such active oxygens (e.g., by means of an epitaxial strain), it is possible to change the sign of the piezoelectric response of the material.

Sign in / Sign up

Export Citation Format

Share Document