Bioferroelectric Properties of Glycine Crystals

Biological ferroelectric materials have great potential in biosensing and disease diagnosis and treatment. Glycine crystals form the simplest bioferroelectric materials, and here we investigate the polarizations of its beta- and gamma-phases. Using density functional theory, we predict that glycine crystals can develop polarizations even larger than those of conventional inorganic ferroelectrics. Further, using systematic molecular dynamics simulations utilizing polarized crystal charges, we predict the Curie temperature of gamma-glycine to be 630 K, with a required coercive field to switch its polarization states of 1V.nm(-1), consistent with experimental evidence. This work sheds light on the microscopic mechanism of electric dipole ordering in biomaterials, helping in the material design of novel bioferroelectrics.