About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Energy Materials for Sustainable Development
|
| Presentation Title |
True Binary Ferroelectric ε−WO3 Nanoparticles and It’s Polaron Driven Opto-electronic Interaction |
| Author(s) |
Mohammad Mahafuzur Rahaman, Jose Flores, Mohamed Yaseen Noor, Md Mohsinur Rahman Adnan, Alex Blackston, Enam Chowdhury, Roberto Correa Myers, Michael Newburger, Pelagia-Irene (Perena) Gouma |
| On-Site Speaker (Planned) |
Mohammad Mahafuzur Rahaman |
| Abstract Scope |
A unique polymorph of binary tungsten trioxide, the epsilon phase (ε-WO₃), has non-centrosymmetric ferroelectric structure and was stable below -43oC in bulk, but remained elusive from ferroelectric characterization. In this study, we stabilized the ε-WO₃ phase at room temperature (RT) as nanopowders via flame spray pyrolysis method. Afterwards, a novel technique is developed to prepare uniform films made from the nanopowders using controlled drop cast technique that has enabled us to reveal its ferroelectric nature at RT. Evidence of ferroelectric hysteresis, and nanoscale domains, and dipole switching under electric fields is presented. This binary oxide also displays a clear second harmonic generation (SHG) signal and anticlockwise ferroelectric butterfly C vs V hysteresis. Remarkably, ε-WO₃ shows ferroelectric polarization responses to below 2.0 eV optical stimuli via polaron formation. The underlying mechanism of this effect is explored, highlighting ε-WO₃’s potential opportunities and challenges for using it in next generation energy applications. |