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http://hdl.handle.net/10603/442213
Title: | Synthesis of organic inorganic hybrid ferroelectric materials and their utility in mechanical energy harvesting applications |
Researcher: | DESWAL, SWATI |
Guide(s): | BOOMISHANKAR, RAMAMOORTHY |
Keywords: | Chemistry Chemistry Inorganic and Nuclear Physical Sciences |
University: | Indian Institute of Science Education and Research (IISER) Pune |
Completed Date: | 2022 |
Abstract: | Multifunctional materials displaying ferroelectric properties are highly desirable for high technique applications in the areas of energy and electronics Conventionally inorganic ceramic oxides are employed as commercial ferroelectric materials However they require high temperature syntheses high voltage poling and time consuming fabrication techniques which impedes their dynamic utilization in certain fields of application In this regard ferroelectrics consisting of organic and hybrid organic inorganic materials are extensively investigated owing to their easy synthesis light weight high flexibility and high polarization values This thesis highlights the design and synthesis of ferroelectric materials derived from small molecules based on organo ammonium phosphonium and aminophosphazenium salts and their utility in mechanical energy harvesting applications By employing flexible ammonium phosphonium and aminophosphazenium centred scaffolds containing heteroleptic organo and amino substituents we synthesized several non centrosymmetric organic and organic inorganic hybrid assemblies with ferroelectric properties The substituents around these cationic cores in these assemblies were varied from alkyl to aryl to amino groups and diverse anions such as CdBr4 2 CdCl3 Bi2Br9 3 I ions were employed to stabilize their charge separated structures By precise molecular tailoring and fine tuning intermolecular interactions crystal packing structures ranging from discrete to one and two dimensional networks were obtained Ferroelectric measurement performed on these materials rendered well resolved hysteresis loops with high remnant polarization values As the piezoelectric coefficient is directly proportional to the electric polarization several of these materials with high remnant polarization were employed towards the fabrication of composite piezoelectric nanogenerators with non piezoelectric polymers such as polydimethylsiloxane and thermoplastic polyurethane These composite devices demonstrated excellent output |
Pagination: | NA |
URI: | http://hdl.handle.net/10603/442213 |
Appears in Departments: | Department of Chemistry |
Files in This Item:
File | Description | Size | Format | |
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01_fulltext.pdf | Attached File | 25.89 MB | Adobe PDF | View/Open Request a copy |
04_abstract.pdf | 739.35 kB | Adobe PDF | View/Open Request a copy | |
80_recommendation.pdf | 429.01 kB | Adobe PDF | View/Open Request a copy |
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