Facile fabrication of hierarchical nanoporous AuAg alloy and its highly sensitive detection towards dopamine and uric acid
Facile fabrication of hierarchical nanoporous AuAg alloy and its highly sensitive detection towards dopamine and uric acid
复制标题
DOI：
10.1016/j.snb.2015.11.035
复制
发表时间：
2016-03-31
影响因子：
8.4
通讯作者：
Zhou, Jianhua
中科院分区：
文献类型：
--
作者：
Hou, Jiagang;Xu, Caixia;Zhou, Jianhua
具有双峰韧带/孔径分布的分级纳米多孔AuAg（HNP-AuAg）合金是通过AuAgAl源合金中选择性脱合金和银再合金结合退火操作制备的。制成的 HNP-AuAg 合金由互连的分层纳米多孔结构组成，在所有三个维度上具有约 100 和 10 nm 的二阶韧带/孔径分布。以这种特定的纳米多孔结构为特征，HNP-AuAg 合金在存在和不存在抗坏血酸的情况下，对多巴胺 (DA) 和尿酸 (UA) 的同时和单独氧化表现出优异的电催化活性。 HNP-AuAg 合金上的 DA 和 UA 电化学传感在 5-335 μM 和 5-425 μM 的宽线性范围内表现出快速响应和分别为 0.2 μM 和 1.0 μM 的低检测限。更重要的是，所制备的 HNP-AuAg 合金在 DA 和 UA 的检测中表现出长期稳定性和重现性。除了这些吸引人的特性外，HNP-AuAg 在构建电化学传感器来检测 DA 和 UA 方面显示出巨大的应用潜力。 (C) 2015 Elsevier B.V. 保留所有权利。
Hierarchical nanoporous AuAg (HNP-AuAg) alloy with bimodal ligament/pore size distributions is fabricated by means of selective dealloying of Al and redealloying of Ag from AuAgAl source alloy combined with annealing operation. The as-made HNP-AuAg alloy consists of interconnected hierarchical nanoporous architecture with two order ligament/pore size distributions around 100 and 10 nm in all three dimensions. Characterized by such the specific nanoporous architecture, HNP-AuAg alloy exhibits excellent electrocatalytic activities towards the simultaneous and individual oxidation of dopamine (DA) and uric acid (UA) in the absence and presence of ascorbic acid. The electrochemical sensing towards DA and UA on HNP-AuAg alloy displays fast response and low detection limit of 0.2 mu M and 1.0 mu M in a wide linear range of 5-335 mu M and 5-425 mu M, respectively. More importantly, the as-made HNP-AuAg alloy behaves long-term stability and reproducibility towards the detection of DA and UA. Along with these attractive features, HNP-AuAg shows great application potential for constructing electrochemical sensors to the detection of DA and UA. (C) 2015 Elsevier B.V. All rights reserved.