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Showing 1 to 20 of 28 for “"piezoresponse force microscopy"”.
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Investigation of Ferroelectric Thin Film Using Piezoresponse Force Microscopy
… earlier work on this topic, resonance enhanced piezoresponse force microscopy was introduced and theoretical models were developed to support quantitative imaging with PFM. The resonant PFM mechanism was thoroughly investigated, and functional materials including tetragonal polycrystalline …
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High Performance Lead--free Piezoelectric Materials
… field in last few decades owing to their giant piezoresponse and convenient application relevant tunability. With increasing environmental concerns, in the last one decade, focus has been shifted towards developing a better understanding of lead-free piezoelectric compositions in order to …
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Electrodeposited Functional Nanowires for Energy Applications
… of techniques including: scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD) and transmission electron microscopy (TEM) and all of the NWs have been shown to be polycrystalline. The energy harvesting performance of vertically aligned ZnO NW …
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Interfacial Properties of Graphene and 2D Materials Heterostructures Investigated by Scanning Probe Microscopy
… this dissertation, advanced scanning probe microscopy (SPM) techniques, including contact resonance atomic force microscopy (CR-AFM) and piezoresponse force microscopy (PFM), are applied to study the interfacial mechanical and piezoelectrical properties of graphene and 2D materials …
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Deposition, Characterization, and Fabrication of a Zinc Oxide Piezoelectric Thin Film Microspeaker Using DC Reactive Sputtering
… of the ZnO were investigated. Scanning electron microscopy, x-ray diffraction, and atomic force microscopy were utilized to discover the ZnO’s structural properties. Using the XRD and SEM, the as-sputtered ZnO films were found to have highly c-axis oriented columnar crystals. Optical properties …
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Nanometer-thick oxide films for pyroelectric energy conversion
… films deposited using pulsed laser deposition. Piezoresponse force microscopy (PFM), an atomic force microscopy (AFM) based technique, measured the electromechanical response while a doped-silicon resistive micro-heater provided local temperature control up to 400 °C. Three techniques …
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Dielectric and pyroelectric susceptibilities of epitaxial ferroelectric thin films
… techniques such as x-ray di ffraction, piezoresponse force microscopy, and electrical measurements. We show that large dielectric and pyroelectric susceptibilities can be obtained in tensile strained PZT thin fi lms due to the displacement of 90° domain walls and thermal expansion …
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Orientation dependence of dielectric susceptibilities and switching characteristics in epitaxial ferroelectric thin films
… are subsequently observed in stroboscopic piezoresponse force microscopy. These results have implications for our understanding of ferroelectric switching and offer opportunities to change domain reversal speed. Our work also offers new insights into the microscopic origin of dielectric …
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Multiscale Simulations of Dynamics of Ferroelectric Domains
… calculations. The bond-valence-based force field allows for molecular dynamics simulations of ferroelectric response at large time and length scale. The intrinsic inertial response of ferroelectric domain walls is studied in PbTiO3. Examination of the evolution of the polarization and …
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New modalities for strain engineering of lead-free perovskite ferroelectric thin films
… techniques such as x-ray diffraction and piezoresponse force microscopy. We show, for the first time, the presence of monoclinic distortions and intermediate phases (akin to conventional MPB systems) in the mixed-phase films that are crucial for enhanced electromechanical responses. We …
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Interactions of single-crystal lithium niobate surfaces with ultra-violet laser radiation
… by chemical etching in hydrofluoric acid and by piezoresponse force microscopy and was seen to be most effective on the -z face of the crystal. An explanation was proposed whereby photo-excited charges travel within a pyro-electric field, creating a space-charge field which locally inverts the …
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Thermally modulated solidly mounted resonators for applications in biosensing
… layer in these nanoscale resonators. The piezoresponse force microscopy (PFM) revealed these PE-ALD deposited ZnO films have higher piezoelectric coefficients (approximately 3×) compared to the bulk ZnO.
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Investigating the Thermal Stability and Cation Ordering in Layered Cathode LixMO2 (x ≤ 1; M = Co, Mn, Ni) Materials for Li-ion Rechargeable Batteries and Studying the Ferroelectric Properties of LiNbO3 Nanoparticles
… bright field images from transmission electron microscopy studies revealed significant microstructure changes in the delithiated material and thermally aged products. In another system, Li[Ni1−<em>x</em>Mn<em>x</em>]O2 (x = 0.3, 0.5, 0.7), the cation ordering was successfully monitored to …
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Deposition and characterisation of bismuth layer-structured ferroelectric films
… grains (crystallographic orientations). Piezoresponse force microscopy (PFM) was adopted to characterise BSmT films. Domain structures were clearly observed in a PLD-grown BSmT film, which were closely related to the grain structures. Domain manipulation was carried out in a CSD-derived …
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A Schottky-to-Ohmic Transition in Epitaxial Ferroelectric Hafnia Devices
… Ferroelectricity in the film was confirmed by piezoresponse force microscopy. In device configuration, using an Au top electrode with an ultra-thin Ti adhesion layer, a resistance switching mode with large on-off ratio was observed. The pristine device was stabilised in an intermediate …
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Two phase magnetoelectric epitaxial composite thin films
… and magnetoelectric properties were measured by piezoresponse force microscopy and magnetic force microscopy. Results show (i) switching of the magnetization in ferromagnetic CoFe2O4 and of the polarization in ferroelectric BiFeO3 phases under external magnetic and electric field respectively, …
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An investigation into six-fold domain wall vertices in improper ferroelectrics, and their potential as one dimensional pn-junctions
… Hall potential of surfaces using Kelvin Probe Force Microscopy (KPFM), has been developed and implemented in examining the carrier characteristics of conducting ferroelectric domain walls in the improper ferroelectric system ErMnO3. Preliminary measurements reveal that p-type carriers aggregate …
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Multiferroic BiFeO3 films and nanostructures for hybrid energy harvesters
… diffraction (XRD) and transmission electron microscopy (TEM) in the case of intricate nanostructures. Morphological study of the materials has been done by field emission scanning electron microscopy (FE-SEM) and atomic force microscopy (AFM). Coupled to the AFM, piezoresponse force …
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Charged domain wall phenomena and associated negative capacitance in boracites
… probe measurements such as conducting Atomic Force Microscopy (c-AFM) and Piezoresponse Force Microscopy (PFM) to determine that domain walls with an associated dc conductivity distinct from the bulk are caused by two types of polar discontinuity: 90° tail-tail conducting or 90° head-head …
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Multiscale Characterisation of Ice and Collagen: Physicochemical Development of Lyophilised Scaffolds for Tissue Engineering
… through environmental scanning electron microscopy (ESEM) experiments. The dendrite growth rates predicted by the model were most significantly affected by temperature and thermal flux, whereas morphology was shown both computationally and experimentally to be influenced by the surface …
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