High Resolution Piezoresponse Force Microscopy Study of Self-Assembled Peptide Nanotubes

MRS Advances ◽  
2016 ◽  
Vol 2 (02) ◽  
pp. 63-69
Author(s):  
Maxim Ivanov ◽  
Ohheum Bak ◽  
Svitlana Kopyl ◽  
Semen Vasilev ◽  
Pavel Zelenovskiy ◽  
...  
Keyword(s):  
High Resolution ◽  
Piezoresponse Force Microscopy ◽  
Microscopy Study ◽  
Radial Component ◽  
Peptide Nanotubes ◽  
Force Microscopy ◽  
Reduced Graphene ◽  
Axial Polarization ◽  
Heating Up

ABSTRACT Peptide nanotubes based on short dipeptide diphenylalanine (FF) attract a lot of attention due to their unique physical properties ranging from strong piezoelectricity to extraordinary mechanical rigidity. In this work, we present the results of high-resolution Piezoresponse Force Microscopy (PFM) measurements in FF microtubes prepared from the solution. First in-situ temperature measurements show that the effective shear piezoelectric coefficient d15 (proportional to axial polarization) significantly decreases (to about half of the initial value) under heating up to 100 oC. The piezoresponse becomes inhomogeneous over the surface being higher in the center of the tubes. Further, PFM study of a composite consisting of FF microtubes and reduced graphene oxide (rGO) was performed. We show that piezoelectric properties of peptide microtubes are significantly modified and radial (vertical) piezoresponse appears in the presence of rGO as confirmed via PFM analysis. The results are rationalized in terms of molecular approach in which π – π molecular interaction between rGO and dipeptide is responsible for the appearance of radial component of polarization in such hybrid structures.

scholarly journals Peritubular Dentin Lacks Piezoelectricity

2007 ◽  
Vol 86 (9) ◽  
pp. 908-911 ◽  
Author(s):  
S. Habelitz ◽  
B.J. Rodriguez ◽  
S.J. Marshall ◽  
G.W. Marshall ◽  
S.V. Kalinin ◽  
...  
Keyword(s):  
High Resolution ◽  
Piezoresponse Force Microscopy ◽  
Collagen Fibrils ◽  
Force Microscopy ◽  
Collagenous Tissue ◽  
Mineralized Tissues ◽  
Human Dentin ◽  
High Resolution Images ◽  
Resolution Imaging ◽  
Apatite Mineral

Dentin is a mesenchymal tissue, and, as such, is based on a collagenous matrix that is reinforced by apatite mineral. Collagen fibrils show piezoelectricity, a phenomenon that is used by piezoresponse force microscopy (PFM) to obtain high-resolution images. We applied PFM to image human dentin with 10-nm resolution, and to test the hypothesis that zones of piezoactivity, indicating the presence of collagen fibrils, can be distinguished in dentin. Piezoelectricity was observed by PFM in the dentin intertubular matrix, while the peritubular dentin remained without response. High-resolution imaging of chemically treated intertubular dentin attributed the piezoelectric effect to individual collagen fibrils that differed in the signal strength, depending on the fibril orientation. This study supports the hypothesis that peritubular dentin is a non-collagenous tissue and is thus an exception among mineralized tissues that derive from the mesenchyme.

In situ atomic force microscopy study of nano–micro sodium deposition in ester-based electrolytes

2018 ◽  
Vol 54 (19) ◽  
pp. 2381-2384 ◽  
Author(s):  
Mo Han ◽  
Chenbo Zhu ◽  
Ting Ma ◽  
Zeng Pan ◽  
Zhanliang Tao ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Microscopy Study ◽  
Atomic Force Microscopy Study ◽  
Force Microscopy ◽  
Atomic Force ◽  
Effect Of Additives

This communication reports an in situ atomic force microscopy study of sodium deposition and the effect of additives in an ester-based electrolyte.

scholarly journals Structure and Dynamics of Ferroelectric Domains in Polycrystalline Pb(Fe1/2Nb1/2)O3

Materials ◽  
2019 ◽  
Vol 12 (8) ◽  
pp. 1327 ◽  
Author(s):  
Ursic ◽  
Bencan ◽  
Prah ◽  
Dragomir ◽  
Malic
Keyword(s):  
Domain Wall ◽  
Ambient Temperature ◽  
Domain Structure ◽  
Domain Walls ◽  
Domain Switching ◽  
Piezoresponse Force Microscopy ◽  
Paraelectric Phase Transition ◽  
Force Microscopy ◽  
Ferroelectric Domains

A complex domain structure with variations in the morphology is observed at ambient temperature in monoclinic Pb(Fe1/2Nb1/2)O3. Using electron microscopy and piezoresponse force microscopy, it is possible to reveal micrometre-sized wedge, lamellar-like, and irregularly shaped domains. By increasing the temperature, the domain structure persists up to 80 °C, and then starts to disappear at around 100 °C due to the proximity of the ferroelectric–paraelectric phase transition, in agreement with macroscopic dielectric measurements. In order to understand to what degree domain switching can occur in the ceramic, the mobility of the domain walls was studied at ambient temperature. The in situ poling experiment performed using piezoresponse force microscopy resulted in an almost perfectly poled area, providing evidence that all types of domains can be easily switched. By poling half an area with 20 V and the other half with −20 V, two domains separated by a straight domain wall were created, indicating that Pb(Fe1/2Nb1/2)O3 is a promising material for domain-wall engineering.

Sign in / Sign up

Export Citation Format

Share Document