Lattice defects and oxide formation coupledly enhanced giant electrical resistance change in nanoporous silver
Lattice defects and oxide formation coupledly enhanced giant electrical resistance change in nanoporous silver
复制标题
晶格缺陷和氧化物形成耦合增强了纳米多孔银的巨大电阻变化
DOI：
10.1016/j.electacta.2016.04.091
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发表时间：
2016-07
影响因子：
6.6
通讯作者：
Zhang Zhonghua
中科院分区：
文献类型：
--
作者：
Bai Qingguo;Zhang Jie;Si Conghui;Qi Zhen;Zhang Zhonghua
纳米结构金属材料的电化学电阻响应是电化学、物理学和表面科学等多学科交叉领域的重要研究课题。纳米多孔金属具有开放的三维双连续韧带（纳米线网络）-通道（纳米孔）结构，具有高的表面积与体积比，在这一主题的研究中显示出巨大的潜力。在这里，我们制造纳米多孔银（银）与高密度的晶格缺陷（位错，孪晶，堆叠缺陷和晶界）和韧带组成的银纳米晶体的大小可比的韧带长度尺度。更重要的是，本发明的电致变色材料显示出对碱性电解质中的电化学刺激的显著增强的可逆电阻响应。在1000 ℃下，电阻变化率高达1100%。此外，通过循环伏安法或方波电位输入，可以很好地调制的可逆电阻的变化。相关的机制已合理化的基础上，可逆的氧化物形成/还原韧带表面的银，银溶解，以及晶格缺陷的影响，在银。
The electrochemically induced electrical resistance response of nanostructured metallic materials is an important issue in interdisciplinary fields including electrochemistry, physics and surface science. Nanoporous metals possess an open three-dimensional bicontinuous ligament (nanowire network)-channel (nanopore) structure with high surface-to-volume ratios, and show great potentials for investigations in this topic. Here we fabricate nanoporous silver (NPS) with high density of lattice defects (dislocations, twins, stacking defaults and grain boundaries) and ligaments composed of Ag nanocrystals with sizes comparable to the ligament length scale. More importantly, the present NPS shows extraordinarily enhanced reversible resistance response to electrochemical stimuli in alkaline electrolytes. A giant reversible resistance change of up to ∼1100% has been achieved in NPS. Moreover, the reversible electrical resistance change of NPS can be well modulated through cyclic voltammetry or square wave potential input. The related mechanisms have been rationalized on the basis of reversible oxide formation/reduction on the ligament surface of NPS, silver dissolution, as well as the effects of lattice defects in NPS.
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