A reproducible write-(read)n-erase and multilevel bio-memristor based on DNA molecule

In this paper, a novel bio-molecular device based on DNA with the reversible memristive behavior is fabricated by a spin-coating method. The Au/(DNA)(10)/Au device shows excellent memristive characteristics including good endurance, long retention time, satisfying ON/OFF current ratio, extraordinary write-read-erase rewritable ability and reproducible write-once read-many times (WORM) memory behavior. More inspiringly, a programmable multistate memory system is achieved under different sweeping voltages, which can significantly enhance the storage density. The introduction of Ag ions decreases the set voltage, which results from the reduction of DNA bandgap and is verified by the UV-Vis and Raman spectra. These results imply that this bio-molecular device has a promising potential for the multilevel nonvolatile memory applications. (C) 2015 Elsevier B.V. All rights reserved.