Resonant properties of polycrystalline biomolecular assemblies Tara Ryan and Sarah Guerin Department of Physics and Bernal Institute, University of Limerick, Castletroy, Limerick, V94T9PX, Republic of Ireland Piezoelectric materials, ubiquitous in modern day technologies, are commonly exploited as resonators- often used to keep track of time, to provide a stable clock signal for digital integrated circuits, and to stabilize frequencies for radio transmitters and receivers. As such there exist many characterisation techniques to study the converse piezoelectric effect, whereby an electrical signal is passed through the sample to induce internal strain or vibration. As we move away from toxic conventional piezoceramics, our group’s research focuses on the design and development of polycrystalline biomolecules for these applications. However no research currently exists on the resonance properties of polycrystalline biomolecular assemblies, such as their resonance frequencies or electromechanical coupling constants. In this talk we will present the first such data on simple amino acid-based piezoelectric device components, as well as discussing the necessary developments in electromechnical characterisation that need to occur for efficient metrology of non-conventional piezoelectrics. The nanoscale chemistry that gives rise to this macroscopic actuation can be used to guide the chemical synthesis and crystallisation of future eco-friendly piezoelectric resonators. References 1. Guerin, Sarah, Syed AM Tofail, and Damien Thompson. "Organic piezoelectric materials: milestones and potential." NPG Asia Materials 11, no. 1 (2019): 1-5. 2. Casadei, Filippo, et al. "Piezoelectric resonator arrays for tunable acoustic waveguides and metamaterials." Journal of Applied Physics 112.6 (2012): 064902. 3. Guerin, Sarah, Aimee Stapleton, Drahomir Chovan, Rabah Mouras, Matthew Gleeson, Cian McKeown, Mohamed Radzi Noor et al. "Control of piezoelectricity in amino acids by supramolecular packing." Nature materials 17, no. 2 (2018): 180- 186. 4. Jiang, Chengming, Qikun Li, Jijie Huang, Sheng Bi, Ruonan Ji, and Qinglei Guo. "Single-layer MoS2 mechanical resonant piezo-sensors with high mass sensitivity." ACS Applied Materials & Interfaces 12, no. 37 (2020): 41991-41998.
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