Highly Sensitive and Selective In-Situ SERS Detection of Pb(2+), Hg(2+), and Cd(2+) Using Nanoporous Membrane Functionalized with CNTs.
Highly Sensitive and Selective In-Situ SERS Detection of Pb(2+), Hg(2+), and Cd(2+) Using Nanoporous Membrane Functionalized with CNTs.
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DOI：
10.1038/srep25307
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发表时间：
2016-05-04
影响因子：
4.6
通讯作者：
Galaly AR
中科院分区：
文献类型：
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作者：
Shaban M;Galaly AR
多孔阳极氧化铝 (PAA) 膜用 CoFe2O4 纳米颗粒进行功能化，并用作生长直径小于 20 nm 的超长螺旋结构碳纳米管 (CNT) 的基材。通过场发射扫描电子显微镜 (FE-SEM)、能量色散 X 射线 (EDX) 和拉曼光谱对所制造的纳米结构的结构和形貌进行了表征。通过将CNT加载到PAA上，CNT和PAA的特征拉曼峰分别表现出4倍和3倍的增强，这使得表面增强拉曼光谱（SERS）基底更加灵敏。为了进行比较，PAA 和 CNT/PAA 阵列用作 SERS 底物，用于检测 Hg2+、Cd2+ 和 Pb2+。所提出的传感器在这些重金属离子之间表现出高灵敏度和选择性。与其他金属离子相比，CNT/PAA 传感器对 Pb2+ 表现出优异的选择性，其中增强因子从 Pb2+ 的约 17 降低到 Hg2+ 的约 12，以及 Cd2+ 的约 4。因此，所提出的CNTs/PAA传感器可以用作测定水溶液中重金属离子的有力工具。
Porous Anodic Alumina (PAA) membrane was functionalized with CoFe2O4 nanoparticles and used as a substrate for the growing of very long helical-structured Carbon Nanotubes (CNTs) with a diameter less than 20 nm. The structures and morphologies of the fabricated nanostructures were characterized by field emission- scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX), and Raman spectroscopy. By uploading the CNTs on PAA, the characteristic Raman peaks of CNTs and PAA showed 4 and 3 times enhancement, respectively, which leads to more sensitive Surface-Enhanced Raman Spectroscopy (SERS) substrates. For comparison, PAA and CNTs/PAA arrays were used as SERS substrates for the detection of Hg2+, Cd2+, and Pb2+. The proposed sensor demonstrated high sensitivity and selectivity between these heavy metal ions. CNTs/PAA sensor showed excellent selectivity toward Pb2+ over other metal ions, where the enhancement factor is decreased from ~17 for Pb2+ to ~12 for Hg2+ and to ~4 for Cd2+. Therefore, the proposed CNTs/PAA sensor can be used as a powerful tool for the determination of heavy metal ions in aqueous solutions.