Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 44, Pages 38802-38813Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12463
Keywords
N-doped graphene; dihydroxybenzene; sensor; cyclodextrin; arylene-ethynylene
Funding
- Natural Science Foundation of China [51402151, 51408297, 51778281]
- Natural Science Foundation of the Jiangsu province [BK20171342, BK20161493, BK20140780]
- Major Science and Technology Program for Water Pollution Control and Treatment, People's Republic of China [2014ZX07214-001]
- QingLan Project
- PAPD
- Jiangsu Province
- Zijin Intelligent Program
- Nanjing University of Science and Technology
- Fundamental Research Funds for the Central Universities [30917011309]
- Graduate research and innovation project of Jiangsu province [KYLX16-0470]
- Institute of Water Environmental Engineering, Jiangsu Industrial Technology Research Institute (Yancheng)
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An electrochemically active sensing nanomaterial (denoted as CD-MPEA-NG) has been successfully constructed by an hierarchical self-assembly of cyclodextrin (CD) and N,N-dimethy1-4-(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 mu M 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.
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