Stable calcium ellagate metal–organic frameworks as high-performance green memorizers bearing high working temperatures

Abstract

The development of green memorizers with distinct mechanism is significant. In this work, renewable polyphenol ellagic acid (EA) and environmentally friendly calcium were used to construct a unique 3D interpenetrated bio-metal–organic framework (BioMOF), i.e. {[Ca₂(EA)₃(4H₂O)]·2H₂O}_n. Its high chemical stability stems from the twofold interpenetrated (6,3) bi-layers and versatile strong π–π stacking interactions. The memorizer FTO/{[Ca₂(EA)₃(4H₂O)]·2H₂O}_n/Ag exhibits good bipolar resistive switching performance with an ON/OFF ratio of 5.40 × 10³ and a tolerant temperature of 300 °C. In particular, the local conjugated EA ligand and strong π–π stacking interactions in the interpenetrated 3D network are responsible for a carrier trapping/de-trapping process, rendering the excellent binary resistive switching performance. This work demonstrates a new way for the construction of green electrons by adopting renewable natural products as organic linkers.