Magnetic-Field-Assisted Assembly of Layered Double Hydroxide/Metal Porphyrin Ultrathin Films and Their Application for Glucose Sensors

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• 作者：Mingfei Shao ; Xiangyu Xu ; Jingbin Han ; Jingwen Zhao ; Wenying Shi ; Xianggui Kong ; Min Wei ; David G. Evans ; Xue Duan
• 刊名：Langmuir
• 出版年：2011
• 出版时间：July 5, 2011
• 年：2011
• 卷：27
• 期：13
• 页码：8233-8240
• 全文大小：1074K
• 年卷期：v.27,no.13(July 5, 2011)
• ISSN：1520-5827

文摘

The ordered ultrathin films (UTFs) based on CoFe-LDH (layered double hydroxide) nanoplatelets and manganese porphyrin (Mn鈥揟PPS) have been fabricated on ITO substrates via a magnetic-field-assisted (MFA) layer-by-layer (LBL) method and were demonstrated as an electrochemical sensor for glucose. The XRD pattern for the film indicates a long-range stacking order in the normal direction of the substrate. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) images of the MFA LDH/Mn鈥揟PPS UTFs reveal a continuous and uniform surface morphology. Cyclic voltammetry, impedance spectroscopy, and chronoamperometry were used to evaluate the electrochemical performance of the film, and the results show that the MFA-0.5 (0.5 T magnetic field) CoFe-LDH/Mn鈥揟PPS-modified electrode displays the strongest redox current peaks and fastest electron transfer process compared with those of MFA-0 (without magnetic-field) and MFA-0.15 (0.15 T magnetic field). Furthermore, the MFA-0.5 CoFe-LDH/Mn鈥揟PPS exhibits remarkable electrocatalytic activity toward the oxidation of glucose with a linear response range (0.1鈥?5 mM; R² = 0.999), low detection limit (0.79 渭M) and high sensitivity (66.3 渭A mM^鈥? cm^鈥?). In addition, the glucose sensor prepared by the MFA LBL method also shows good selectivity and reproducibility as well as resistance to poisoning in a chloride ion solution. Therefore, the novel strategy in this work creates new opportunities for the fabrication of nonenzyme sensors with prospective applications in practical detection.