Selective Detection of Cu2+ Ions by Immobilizing Thiacalix[4]arene on Graphene Field-Effect Transistors
Selective Detection of Cu2+ Ions by Immobilizing Thiacalix[4]arene on Graphene Field-Effect Transistors
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DOI：
10.1021/acsomega.9b03821
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发表时间：
2019-12
期刊：
影响因子：
4.1
通讯作者：
Y. Takagiri;T. Ikuta;K. Maehashi
中科院分区：
文献类型：
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作者：
Y. Takagiri;T. Ikuta;K. Maehashi
高精度的重金属定量检测对环境污染监测和健康安全至关重要。在这里，为了高灵敏度的选择性检测Cu2+离子，研究了在石墨烯场效应晶体管（g - fet）上固定化的thiacalix[4]芳烃（TCA）。我们提出的tca固定化g - fet通过其转移特性的变化成功地用于检测浓度从1 μM到1 mM的Cu2+离子。此外，尽管缓冲溶液中含有Na+、Mg2+、Ni2+和Cd2+等金属离子，但只有在引入Cu2+离子时，所测得的转移特性才会发生明显的变化；这种对Cu2+离子的选择性检测归因于石墨烯上TCA的平面排列。因此，tca固定的g - fet具有选择性检测Cu2+的高灵敏度。
Highly accurate quantitative detection of heavy metals is essential for environmental pollution monitoring and health safety. Here, for selective detection of Cu2+ ions with high sensitivity, thiacalix[4]arene (TCA) immobilized on graphene field-effect transistors (G-FETs) are developed. Our proposed TCA-immobilized G-FETs are successfully used to detect Cu2+ ions at concentrations ranging from 1 μM to 1 mM via changes in their transfer characteristics. Moreover, the measured transfer characteristics clearly shift only when Cu2+ ions are introduced in the buffer solution despite it containing other metal ions, including those of Na+, Mg2+, Ni2+, and Cd2+; this selective detection of Cu2+ ions is attributed to the planar arrangement of TCA on graphene. Therefore, TCA-immobilized G-FETs selectively detect Cu2+ with high sensitivity.