Facile fabrication of a novel 3D graphene framework/Bi nanoparticle film for ultrasensitive electrochemical assays of heavy metal ions
Facile fabrication of a novel 3D graphene framework/Bi nanoparticle film for ultrasensitive electrochemical assays of heavy metal ions
复制标题
轻松制造新型 3D 石墨烯框架/Bi 纳米粒子薄膜，用于重金属离子的超灵敏电化学测定
DOI：
10.1016/j.aca.2017.03.013
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发表时间：
2017-05-22
影响因子：
6.2
通讯作者：
Ding, Shiming
中科院分区：
文献类型：
--
作者：
Shi, Lei;Li, Yangyang;Ding, Shiming
在这项工作中，一种新的3D石墨烯框架/Bi纳米粒子（GF/BiNP）薄膜制备与一个简单的制备路线。电化学还原具有多孔结构的3D石墨烯框架并原位组装在电极上，并且通过化学还原将具有可调形貌的BiNPs高度分散在框架上。新设计的3D GF/BiNP膜具有大的活性面积、快速的电子传递能力、高的传质效率、优异的结构稳定性和电极结合强度。为了证明其上级能力，构建了用于测定重金属离子的电化学传感器。结果表明，该方法能同时测定Pb ~（2+）和Cd ~（2+），检出限为0.02 μ g L ~（-1），检出限为0.05 μ g L ~（-1），线性范围为1 ~ 120 μ g L ~（-1）。同时，单独分析Zn 2+，得到最佳的响应，其中4.0 μ g L-1（S/N - 3）的低检测限与线性范围从40到300 μ g L-1进行了观察，确认的通用性的GF/BiNP膜中的重金属离子的检测。此外，良好的重复性，重现性和稳定性，并在真实的水样中实现可靠的测定与构建的传感器。由于其制备方便、结构良好、性能优异，所制备的3D GF/BiNP薄膜在环境、生物医学、能源等领域具有广阔的应用前景。(C)2017爱思唯尔B. V.保留所有权利。
In this work, a novel 3D graphene framework/Bi nanoparticle (GF/BiNP) film was fabricated with a facile preparation route. 3D graphene framework with porous structures was electrochemically reduced and in situ assembled on the electrode, and BiNPs with tunable morphologies were highly dispersed on the framework by a chemical reduction. Newly-designed 3D GF/BiNP film possessed a significantly large active area, fast electron transfer ability, high mass transfer efficiency, and excellent structure stability and binding strength on electrode. To demonstrate its superior ability, electrochemical sensors for the assay of heavy metal ions were constructed. As a result, a simultaneous assay of Pb2+ and Cd2+ with ultralow detection limits (0.02 mu g L-1 of Pb2+ and 0.05 mu g L-1 of Cd2+, S/N = 3) and a wide linear range from 1 to 120 mu g L-1 was achieved. Meanwhile, a separate analysis of Zn2+ was performed to get optimum responses, in which a low detection limit of 4.0 mu g L-1 (S/N - 3) with a linear range from 40 to 300 mu g L-1 was observed, confirming the versatility of the GF/BiNP film in the detection of heavy metal ions. Moreover, excellent repeatability, reproducibility and stability, and reliable assays in real water samples were realized with constructed sensors. Due to its convenient preparation, favorable structures and excellent properties, prepared 3D GF/BiNP film will find great potential for advanced applications in environment, biomedicine and energy systems. (C) 2017 Elsevier B.V. All rights reserved.