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Hierarchical Self-Assembly of Cyclodextrin and Dimethylamino-Substituted Arylene–Ethynylene on N‑doped Graphene for Synergistically Enhanced Electrochemical Sensing of Dihydroxybenzene Isomers
journal contribution
posted on 2017-10-16, 00:00 authored by Juanjuan Gao, Jingkun Fang, Xuehai Ju, Weiqing Zhu, Xuezhen Lin, Shupeng Zhang, Chuang Ma, Haiou SongAn electrochemically
active sensing nanomaterial (denoted as CD-MPEA-NG) has been successfully
constructed by an hierarchical self-assembly of cyclodextrin (CD)
and N,N-dimethyl-4-(phenylethynyl)aniline
(MPEA) on N-doped graphene (NG) in a low-temperature hydrothermal
process. The unique nanostructure of the high-performance CD-MPEA-NG
was confirmed by utilizing Fourier transform infrared spectra, an
X-ray diffractometer, and differential pulse voltammetry (DPV), etc.
In particular, the method of density functional theory with dispersion
energy (DFT-D) of wB97XD/LanL2DZ was employed to optimize and describe
the face-to-face packing structure of heterodimers of NG and MPEA.
The CD-MPEA-NG sensor exhibits highly sensitive performance toward
dihydroxybenzene isomers, without relying on expensive noble metal
or a complicated preparation process. The experimental results demonstrate
that given the synergistic effect of NG and MPEA as a coupled sensing
platform, CD as a supramolecular cavity can significantly enhance
the electrochemical response. The detection limits (S/N = 3) for catechol (CT), resorcinol (RS), and
hydroquinone (HQ) are 0.008, 0.018, and 0.011 μM by DPV, respectively.
Besides, the CD-MPEA-NG sensor shows a superb anti-interference, reproducibility,
and stability, and satisfactory recovery aimed at detecting isomers
in Nanjing River water. The encouraging performance as well as simplified
preparation approach strongly support the CD-MPEA-NG sensor is a fascinating
electrode to develop as a seamless and sensitive electroanalytical
technique.