抗坏血酸
材料科学
循环伏安法
介电谱
X射线光电子能谱
分析化学(期刊)
扫描电子显微镜
傅里叶变换红外光谱
核化学
电化学
电极
化学工程
化学
色谱法
食品科学
物理化学
复合材料
工程类
作者
Miguel P. Romo,Zaira Mora-Mora,J. J. Alvarado‐Gil,Héctor Eduardo Martínez-Flores
出处
期刊:International Journal of Electrochemical Science
[ESG]
日期:2024-02-01
卷期号:19 (2): 100481-100481
标识
DOI:10.1016/j.ijoes.2024.100481
摘要
This work describes the development of an electrochemical nanosensor for the quantitative determination of ascorbic acid (AA). The transducer and receptor system of the nanosensor is based on a silver-doped titanium oxide nanotube (Ag-TiO2NTs) electrode synthesized by a one-step electrochemical anodization method followed by an annealing treatment. The synthesis was carried out at a constant potential of 30 V for 45 min in an organic electrolyte in the presence of F- ions and the dopant. The obtained structure was then subjected to morphological and compositional analysis. In addition, its analytical response to ascorbic acid was evaluated. The analytical techniques employed included scanning electron microscopy (SEM), X-ray diffraction (DRX), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), electrochemical impedance spectroscopy (EIS), and cyclic voltammetry (CV). The results demonstrate the growth of a highly ordered nanotube array with average dimensions of 80 nm, 19 nm and 1660 nm for diameter, wall thickness and length, respectively, and suggest a major composition of silver-doped titanium oxide. The synthesized Ag-TiO2NTs successfully recorded electroanalytical activity for ascorbic acid, with a non-reversible, diffusion-controlled, and mostly capacitive electrochemical profile. It showed low resistance to change transfer and registered a sensitivity of 216.24μA/(mM∙cm2) and a detection limit of 11.1 μM in a linear range of 840-4000 μΜ. The sensor demonstrated repeatability and reproducibility with RSD values of 5.5% and 2.8%, respectively. In addition, it showed selectivity for AA in the presence of glucose at AA/GLU values (1:1, 1:10 and 1:100).
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