Journal
JOURNAL OF MATERIALS CHEMISTRY B
Volume 10, Issue 36, Pages 6958-6964Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d2tb00997h
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Funding
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0020283]
- Grainger Institute for Engineering
- U.S. Department of Energy (DOE) [DE-SC0020283] Funding Source: U.S. Department of Energy (DOE)
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This study demonstrates a kinetic approach to control the crystal orientation of glycine films, resulting in enhanced piezoelectric properties.
Glycine, the simplest amino acid, is considered a promising functional biomaterial owing to its excellent biocompatibility and strong out-of-plane piezoelectricity. Practical applications require glycine films to be manufactured with their strong piezoelectric polar 001 direction aligned with the film thickness. Based on the recently-developed solidification approach of a polyvinyl alcohol (PVA) and glycine aqueous solution, in this work, we demonstrate that the crystal orientation of the as-synthesized film is determined by the orientation of glycine crystal nuclei. By controlling the local nucleation kinetics via surface curvature tuning, we shifted the nucleation site from the edge to the middle of the liquid film, and thereby aligned the 001 direction vertically. As a result, the PVA-glycine-PVA sandwich film exhibits the highest aver-age piezoelectric coefficient d(33) of 6.13 +/- 1.13 pC N-1. This work demonstrates a promising kinetic approach to achieve crystallization and property control in a scalable biocrystal manufacturing process.
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