Bipolar resistive switching behavior in Au/Pt-Fe_2O_3 core-shell nanoparticles assembly/Ti with 3×3 crossbar array structure

摘要

The fabrication of 3 × 3 crossbar arrays with a width of 20 urn is demonstrated. The bipolar resistive switching characteristics in Pt-Fe_2O_3 core-shell nanoparticles are investigated in the crossbar structure of top electrode (Au/Pt-Fe_2O_3 nanopartide assembly/bottom electrode (Ti on SiO_2/Si substrate. The monodisperse Pt-Fe_2O_3 nanoparticles with the diameter ～15 nm are chemically synthesized by the preferential oxidation of Fe and then pileup of Ft into the core in the presence of oleic acid and oleylamine at high temperature. The nanoparticles are assembled as a layer with a thickness of 50 nm by repeated dip-coating. The Pt cores in the core-shell nanoparticles act as electron traps. The bipolar resistive switching behavior in Au/nanoparticle assembly/Ti device could be caused by the electron trapping and detrapping of the nanoparticles. The resistance ratio of HRS to LRS is ～57 at a reading voltage of 0.5 V. The value of reset voltage is 3.4 V and that of set voltages is-1.0 V.