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. Author manuscript; available in PMC: 2019 Jan 31.
Published in final edited form as: J Nanopart Res. 2018 May 1;20(5):125. doi: 10.1007/s11051-018-4217-3

Fig. 5.

Fig. 5

Piezoelectric properties of glycine crystals polymorphs. a Open-circuit voltage response of a layer of γ-glycine seed crystals, orientated along the crystallo-graphic 2-axis. Manual force is applied along the crystallographic 2-axis over time. b A layer of γ-glycine seed crystals on a square copper 18 mm × 18 mm electrode insulated with varnish. c Manual compression of a γ-glycine seed crystal layer. Full compression of the layer as shown averaged a force of 0.172 N (adapted from Guerin et al. 2018 with permission)