3 years ago

Nonpolar Resistive Switching in Ag@TiO2 Core–Shell Nanowires

Nonpolar Resistive Switching in Ag@TiO2 Core–Shell Nanowires
John J. Boland, Subhajit Biswas, Justin D. Holmes, Hugh G. Manning
Nonpolar resistive switching (RS), a combination of bipolar and unipolar RS, is demonstrated for the first time in a single nanowire (NW) system. Exploiting Ag@TiO2 core–shell (CS) NWs synthesized by postgrowth shell formation, the switching mode is controlled by adjusting the current compliance effectively, tailoring the electrical polarity response. We demonstrate ON/OFF ratios of 105 and 107 for bipolar and unipolar modes, respectively. In the bipolar regime, retention times could be controlled up to 103 s, and in the unipolar mode, >106 s was recorded. We show how the unique dual-mode switching behavior is enabled by the defect-rich polycrystalline material structure of the TiO2 shell and the interaction between the Ag core and the Ag electrodes. These results provide a foundation for engineering nonpolar RS behaviors for memory storage and neuromorphic applications in CSNW structures.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b10666

DOI: 10.1021/acsami.7b10666

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