期刊
MATERIALS SCIENCE AND ENGINEERING C-MATERIALS FOR BIOLOGICAL APPLICATIONS
卷 85, 期 -, 页码 97-106出版社
ELSEVIER
DOI: 10.1016/j.msec.2017.12.004
关键词
Electrochemically reduced graphene oxide; Polydiaminobenzene; Potentiodynamic method; Nitrite; Amperometry; Drinking water samples
资金
- Priority Research Centers Program [NRF-2014R1A6A1031189]
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2015R1D1A1A09060292]
- Science and Engineering Research Board, Department of Science and Technology, Government of India [PDF/2016/001723]
An electrode comprised of a polydiaminobenzene (p-DAB) film formed on electrochemically reduced graphene oxide (ERGO) on a glassy carbon (GC) (p-DAB@ERGO/GC) was fabricated using a potentiodynamic method for the sensitive and selective determination of nitrite in the presence of a common interference. The p-DAB@ERGO/GC film-modified electrode surfaces were characterized by scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, electrochemical impedance spectroscopy and cyclic voltammetry. The film fabrication was initiated via the -NH2 groups of DAB, which was confirmed by XPS from the peaks corresponding to =NH (396.7 eV), -NH (399.4 eV), -N=N- (400.2 eV), and -N+H (402.2 eV). The Raman spectra revealed the characteristic D and G bands at 1348 and 1595 cm(-1), respectively, which confirmed the fabrication of GO on the GC electrode, and the ratio of the D and G bands was increased after the electrochemical reduction of GO. The surface coverage of the modified electrode was 8.16 x 10(-11) mol cm(-2). The pDAB@ERGO/GC film-modified electrode was used successfully for the determination of nitrite ions. The pDAB@ERGO/GC film-modified electrode exhibited superior activity for the determination of nitrite compared to the bare GC and p-DAB@GC electrodes. The amperometric current increased linearly with increasing nitrite concentration from 7.0 x 10(-6) to 2.0 x 10(-2) M. The detection limit was 30 nM (S/N = 3). In addition, the modified electrode was used successfully to determine the nitrite ion concentration in the presence of a 100-fold excess of common interferents. The practical application of the modified electrode was demonstrated by determining the nitrite ion concentration in water samples.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据