Citation: HAN Bing-Yan, YAN Qin, XIN Ze, YAN Qi-Fang, JIANG Jing-Mei. Gold Nanoclusters Positioned on Outer Surface of Zeolitic Imidazolate Framework-8 for Improvement of Emission Intensity and Selectivity in Detection of Permanganate[J]. Chinese Journal of Analytical Chemistry, ;2020, 48(8): 1025-1032. doi: 10.19756/j.issn.0253-3820.201163 shu

Gold Nanoclusters Positioned on Outer Surface of Zeolitic Imidazolate Framework-8 for Improvement of Emission Intensity and Selectivity in Detection of Permanganate

HAN Bing-Yan ^1,2, ,
YAN Qin ^1,2 ,
XIN Ze ^1,2 ,
YAN Qi-Fang ^1,2 ,
JIANG Jing-Mei ^1,2

1.
State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, China;
2.
School of Chemical Engineering, Dalian University of Technology, Panjin 124221, China

Received Date: 26 March 2020
Revised Date: 22 May 2020

Fund Project: This work was supported by the State Key Laboratory of Fine Chemicals, Dalian University of Technology (No. KF 1807).

Fluorescent metal nanoclusters usually do not have specific selectivity, which limits their sensing application. Herein, the gold nanoclusters/zeolitic imidazolate framework-8 (AuNCs/ZIF-8) nanocomposites were developed for specific detection of MnO₄^-. Transmission electron microscopy (TEM), scanning electron microscopy (SEM) and Fourier transform infrared (FT-IR) characterization showed that AuNCs were immobilized on the outer surface of ZIF-8 via the coordinative interaction. Compared with individual AuNCs solution, the photoluminescence intensity of AuNCs on AuNCs/ZIF-8 nanocomposites was increased, eliminating the interference of Cu²⁺ and Hg²⁺ ions, and demonstrating a better selectivity toward MnO₄^-. UV-Vis absorption spectra and TEM images showed that the sensing mechanism of MnO₄^- resulted from inner filter effect. In addition, a good linearity between photoluminescence intensity of AuNCs/ZIF-8 nanocomposites and MnO₄^- concentration in the range of 1-30 -μmol/L was obtained, with a detection limit of 0.64 -μmol/L.
- Zeolitic imidazolate framework-8,
- Gold nanoclusters,
- Specific detection,
- Permanganate
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