School of Chemistry, University College Cork , Cork T12 YN60, Ireland.
ACS Appl Mater Interfaces. 2017 Nov 8;9(44):38959-38966. doi: 10.1021/acsami.7b10666. Epub 2017 Oct 25.
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@TiO 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 10 and 10 for bipolar and unipolar modes, respectively. In the bipolar regime, retention times could be controlled up to 10 s, and in the unipolar mode, >10 s was recorded. We show how the unique dual-mode switching behavior is enabled by the defect-rich polycrystalline material structure of the TiO 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.
首次在单个纳米线 (NW) 系统中展示了非极性电阻开关 (RS)，它结合了双极和单极 RS。通过对通过后生长壳形成合成的 Ag@TiO 核壳 (CS) NW 进行利用，通过有效调整电流顺应性来控制开关模式，从而调整电极性响应。我们分别为双极和单极模式演示了 10 和 10 的导通/关断比。在双极模式下，保持时间可以控制在 10 s 以内，而在单极模式下，记录的时间超过 10 s。我们展示了富缺陷的多晶 TiO 壳材料结构和 Ag 核与 Ag 电极之间的相互作用如何使独特的双模式开关行为成为可能。这些结果为在 CSNW 结构中用于存储和神经形态应用的非极性 RS 行为的工程提供了基础。
