One-step synthesis of a Methylene Blue@ZIF-8-reduced graphene oxide nanocomposite and its application to electrochemical sensing of rutin.
Mikrochim Acta
; 185(5): 279, 2018 05 03.
Article
en En
| MEDLINE
| ID: mdl-29725773
ABSTRACT
The authors demonstrate the exploitation of reduced graphene oxide (RGO) as a template for immobilizing zeolitic imidazolate framework-8 (ZIF-8) crystals loaded with the electrochemical probe Methylene Blue (MB). The framework was deposited on the surface of RGO in a one-pot process. Transmission electron microscopy, scanning electron microscopy and X-ray diffraction were employed to characterize the nanocomposite. The electrochemical behavior of rutin at a glassy carbon electrode (GCE) modified with the nanocomposite was investigated by cyclic voltammetry and differential pulse voltammetry. The modified GCE displays high electrocatalytic activity toward rutin oxidation at a relatively low working potential (0.4 V vs. Ag/AgCl). Under the optimal conditions, the sensor has an amperometric response that is linear in the 0.1 to 100 µM rutin concentration range, with a 20 nM detection limit (at an S/N ratio of 3). The method was successfully applied to the determination of rutin in tablets and urine samples. Graphical abstract The zeolitic imidazolate framework ZIF-8 was loaded with Methylene Blue and deposited on the surface of reduced graphene oxide. A glassy carbon electrode was modified with the nanocomposite and then used for the determination of rutin with a 20 nM detection limit and a linear range from 0.1 to 100 µM.
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01-internacional
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MEDLINE
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En
Revista:
Mikrochim Acta
Año:
2018
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Article