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Synthesis of potassium-modified graphene and its application in nitrite-selective sensing

Version 2 2024-06-13, 12:52
Version 1 2019-03-08, 11:04
journal contribution
posted on 2024-06-13, 12:52 authored by XR Li, FY Kong, J Liu, TM Liang, JJ Xu, HY Chen
Chemical modification with foreign atoms is a leading strategy to intrinsically modify the properties of host materials. Among them, potassium (K) modification plays a critical role in adjusting the electronic properties of carbon materials. Graphene, a true 2D carbon material, has shown fascinating applications in electrochemical sensing and biosensing. In this work, a facile and mild strategy to K-modifying in graphene at room-temperature is reported for the first time. X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), transmission electron microscopy (TEM), Raman spectra, and cyclic voltammetry are used to characterize this K-modified graphene. The K-modified graphene is capable of acting as an electron transfer medium and more efficiently promotes charge transfer than unmodified graphene. A highly sensitive and stable amperometric sensor based on its excellent electrocatalytic activity toward the oxidation of NO 2- is proposed. The sensor shows a linear range from 0.5 μM to 7.8 mM with a detection limit of 0.2 μM at a signal-to-noise ratio of 3. The modified electrode has excellent analytical performance and can be successfully applied in the determination of NO 2- released from liver cancer and leukemia cells and shows good application potential in biological systems. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

History

Journal

Advanced functional materials

Volume

22

Pagination

1981-1988

Location

Chichester, Eng.

ISSN

1616-301X

eISSN

1616-3028

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2012, WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim

Issue

9

Publisher

Wiley

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