Hierarchical nested-network porous copper fabricated by one-step dealloying for glucose sensing

Hierarchical nested-network porous copper fabricated by one-step dealloying for glucose sensing
复制标题

用于葡萄糖传感的一步脱合金制备的分层嵌套网络多孔铜

DOI:
10.1016/j.jallcom.2016.04.217
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发表时间:
2016-10
影响因子:
6.2
通讯作者:
Liu Hong
Liu Hong
中科院分区:
材料科学2区
文献类型:
--
作者:
Li Xuequan;Huang Baisheng;Qiu Cuicui;Li Zhou;Shao Li-Hua;Liu Hong

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采用一步自由脱合金法制备了一种新型自支撑分级嵌套网络多孔铜(HNNPC)。Al75Cu25(at.%)制备了具有纯Al相和金属间化合物Al 2Cu相的合金前驱体。合金的微观结构导致分级多孔结构,其特征在于在微米尺度下具有较大的韧带(孔)(约100微米)。3-5μm)和纳米级(约100 μ m)的较小韧带(孔)。50-60 nm)。对HNNPC的形貌、晶体结构、元素分析、比表面积、孔径分布、电化学性能和传感性能进行了研究。所得HNNPC具有双连续分级结构,其满足电化学或化学应用的要求,即(1)较大的孔提供用于快速切换的快速传输路径,以及(2)纳米级的较小孔具有用于功能化的大表面积。HNNPC对葡萄糖具有良好的电催化活性,有望作为一种高灵敏度的葡萄糖传感器。此外,HNNPC本身也可以是许多其他活性材料。
A novel freestanding hierarchical nested-network porous copper (HNNPC) was fabricated by one-step free dealloying. The Al75Cu25(at.%) alloy precursor was prepared with both pure Al phase and the intermetallic Al2Cu phase. The microstructure of the alloy led to the hierarchical porous structure characterized by larger ligaments (pores) at micron scale (ca. 3–5 μm) and the smaller ligaments (pores) at nanoscale (ca. 50–60 nm) through dealloying. The morphology, crystal structure, elemental analysis, surface area, pore sizes distribution, electrochemical and sensing properties of HNNPC have been studied. The resulted HNNPC had bicontinuous hierarchical structure, which met the electrochemical or chemical applications’ requirements, namely, (1) the larger pores providing rapid transport pathways for fast switching and (2) smaller pores at nanoscale having the large surface area for functionalization. The CV and EIS of HNNPC presented an electro-catalytic activity to glucose, which was promising as a glucose sensor with excellent sensitivity. Furthermore, HNNPC itself could also be a host of other active materials.
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