University of Lodz, Faculty of Chemistry, Department of Inorganic and Analytical Chemistry, Tamka 12, 91-403 Lodz, Poland.
University of Lodz, Faculty of Chemistry, Department of Inorganic and Analytical Chemistry, Tamka 12, 91-403 Lodz, Poland.
Anal Chim Acta. 2018 Dec 4;1035:22-31. doi: 10.1016/j.aca.2018.06.057. Epub 2018 Jun 21.
New insight into the preparation of sensitive carbon-based electrochemical electrode is provided by examining the properties of thermally reduced graphene oxide (TRGO). In this paper, TRGO was prepared by thermal reduction of graphene oxide (GO) in argon atmosphere, and characterized by Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED), and atomic force microscopy (AFM). Results showed that thermal reduction in argon was effective to remove oxygen-containing functional groups in GO, and graphene sheets were obtained. Furthermore, TRGO was used to prepare thermally reduced graphene oxide paste electrode (TRGOPE) which showed excellent conductivity and fast electron transfer kinetics confirmed by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). The electrode was applied to determination of the pesticide naptalam (Nap) in square-wave voltammetric (SWV) mode. The corresponding current at approx. +1.0 V increased linearly with the Nap concentration within two linear dynamic ranges (LDR) of 0.1-1.0 μmol L (LDR) and 1.0-10.0 μmol L (LDR). The limits of detection (LOD) and quantification (LOQ) for Nap were calculated as 0.015 μmol L and 0.051 μmol L, respectively. In comparison to the carbon paste electrode (CPE) the results showed that the TRGOPE possesses advantages in terms of linearity, sensitivity and detectability.
通过研究热还原氧化石墨烯（TRGO）的性质，为制备敏感的基于碳的电化学电极提供了新的见解。本文采用氩气气氛下热还原氧化石墨烯（GO）的方法制备了 TRGO，并通过傅里叶变换红外（FTIR）光谱、透射电子显微镜（TEM）、选区电子衍射（SAED）和原子力显微镜（AFM）对其进行了表征。结果表明，氩气中的热还原有效地去除了 GO 中的含氧官能团，得到了石墨烯片。此外，TRGO 被用于制备热还原氧化石墨烯糊电极（TRGOPE），通过电化学阻抗谱（EIS）和循环伏安法（CV）证实了其具有优异的导电性和快速的电子转移动力学。该电极应用于方波伏安法（SWV）模式下测定农药萘丙胺（Nap）。在两个线性动态范围（LDR）内，约+1.0 V 处的相应电流与 Nap 浓度呈线性关系，范围分别为 0.1-1.0 μmol·L（LDR）和 1.0-10.0 μmol·L（LDR）。Nap 的检测限（LOD）和定量限（LOQ）分别计算为 0.015 μmol·L 和 0.051 μmol·L。与碳糊电极（CPE）相比，TRGOPE 在线性度、灵敏度和检测能力方面具有优势。
