Electrospun 1D f-MWCNTs-TiO2 composite nanofibers for resistive memory and synaptic learning applications

Abstract

Herein, we have fabricated 1-dimensional (1D) functionalized multi-walled carbon nanotubes (f-MWCNTs)-titanium dioxide (TiO2) composite nanofibers (NFs) with facile electrospinning technique. The synthesized composite NFs were characterized by using X-ray diffraction, field emission scanning electron microscopy, energy dispersive spectroscopy, and X-ray photoelectron spectroscopy techniques. The resistive switching (RS) behavior of the Ag/f-MWCNTs-TiO2/Fluorine-doped tin oxide (FTO) device was studied and memristive properties were calculated. The device shows excellent endurance (~500 cycles) and memory retention (104 s) properties. The electrospun NFs based memory device successfully mimics the spike-timing-dependent plasticity (STDP) based anti-symmetric Hebbian and anti-symmetric anti-Hebbian learning rules. The charge transport mechanism follows the space charge limited current model and RS mechanism was due to the filamentary effect. The results of our investigations asserted that the electrospun f-MWCNTs-TiO2 composite NFs are potential material for memory and synaptic learning applications.