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Lead-free Nanostructured and Organic Ferroelectrics:
Ferroelectric (FE) lead-free perovskite oxide exhibit long range alignment of electric dipoles resulting in a net polarization under an applied electric field. Due to this property and other characteristics such as pyroelectricity and large dielectric constants, FE materials have potentially become essential components in a wide spectrum of applications such as nonvolatile random access memory, and micro-electro-mechanical devices. They are also being explored for various sensor and actuator applications as high frequency electrical components and tunable microwave circuits. Multi-level nanostructural and molecular engineering in FE materials increases property efficiency. Our research is focused to synthesize size and novel shape controlled nanostructures of new and potentially useful ferroelectric materials in order to study the effects of dimension on the properties of these materials.
Soft organic FE-materials bring new opportunities owing to their flexibility, lightness, and non-toxicity. MOFs, 2D organic pervoskites, novel supramolecular donor(D)–acceptor(A) charge transfer (CT)-complexes, H-bonded co-crystals, are a few examples, because in one hand it enables directional orientation of the intrinsically polarizable entitiy to generate a macro-dipole, while on the other hand its dynamics may help in electrically reversible polarization, a pre-requisite for realizing ferroelectricity. The understanding is directly applied for the knowledge of prototype device construction.
Lead-free and Flexible -Organic based Piezoelectric Energy Harvesting:
Piezoelectric polymers, capable of converting mechanical vibrations into electrical energy, are attractive for use in vibrational energy harvesting because they are mechanically stable, chemically robust, and potentially biocompatible. Nanoscale piezoelectric energy harvesters, can directly convert small-scale ambient vibrations into electrical energy. Harvesting power from surrounding vibrations offers an attractive route to replace fixed power sources that need replacing/recharging, and that do not scale with the diminishing size of modern electronics. We are exploring novel polymer piezoelectric materials for their applications as piezoelectric energy harvester. In this regard, our interest is in finding a range of bio- and non-bio piezoelectric polymer molecules and understanding their fundamental piezo properties at different length and dimensions (1- & 2-dimensional specifically) to predict their use in future mico-energy applications.
Nano- and flexible-thermoelectrics:
Recent progress in higher efficiency theromoelectric materials can be attributed to nanoscale enhancement. Physically, nanostructured thermoelectric materials aims to split the interdependence of the electrical and thermal transport, allowing for greater optimization of the thermal and electrical properties. One consequence of nanostructuring is the increase of interfaces since interface scattering of phonons and charge carriers play an important role in understanding the fundamental physics behind this enhancement. Our interest is to investigate the carrier transport properties of ceramic and polymer thermoelectric materials in reduced dimensions in order to promote further insight and stimulate fundamental research in thermoelectrics energy conversion technology.
Nanogeoscience (developing):
Nanoinstruments and techniques enable us to explore the chemical and physical properties of natural minerals and rocks at the "tinniest" possible scale length, where we dig into to find the secrets of environmental change and earth's surface change long long time ago. We focus on the geochemical and geophysical phenomena that take place at the interface between rocks and sediments and fluids, within the mineral deposits and beyond. We aim to use our new knowledge to find solutions to societal challenges.
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