Study of synaptic properties of honey thin film for neuromorphic systems

•Synaptic properties of honey thin film were investigated for the first time.•Honey thin film showed analog switching, essential for synaptic behaviors.•Paired pulse facilitation and dynamic filtering were demonstrated. Besides conventional electrical properties, materials for emerging artificial synaptic devices in brain-inspired neuromorphic systems need to have properties analogous to those of biological synapses, such as synaptic plasticity. In this work, we investigated, for the first time, the synaptic properties of a natural bio-organic material – honey. The honey film was sandwiched between Ag and ITO to form a structure resembling biological synapse. Neural facilitation, an essential synaptic plasticity, was demonstrated by honey thin film with a larger facilitation index, wider interval time range and higher dynamic filtering gain than other natural bio-organic materials. The results indicate that honey is promising for renewable artificial synaptic devices.