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Organic–Inorganic Nanohybrid Electrochemical Sensors from Multi-Walled Carbon Nanotubes Decorated with Zinc Oxide Nanoparticles and In-Situ Wrapped with Poly(2-methacryloyloxyethyl ferrocenecarboxylate) for Detection of the Content of Food Additives

1
Key Laboratory of Macromolecular Science of Shaanxi Province, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710062, China
2
School of Food & Biological Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China
3
Shaanxi Province Engineering Research Center of Coal Conversion Alcohol, College of Chemistry and materials, Weinan Normal University, Weinan 710114, China
*
Authors to whom correspondence should be addressed.
Nanomaterials 2019, 9(10), 1388; https://doi.org/10.3390/nano9101388
Received: 25 August 2019 / Revised: 19 September 2019 / Accepted: 23 September 2019 / Published: 27 September 2019
An electrochemical sensor for detection of the content of aspartame was developed by modifying a glassy carbon electrode (GCE) with multi-walled carbon nanotubes decorated with zinc oxide nanoparticles and in-situ wrapped with poly(2-methacryloyloxyethyl ferrocenecarboxylate) ([email protected]/PMAEFc). [email protected]/PMAEFc nanohybrids were prepared through reaction of zinc acetate dihydrate with LiOH·H2O, followed by reversible addition-fragmentation chain transfer polymerization of 2-methacryloyloxyethyl ferrocenecarboxylate, and were characterized by Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), Raman, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscope (AFM), scanning electron microscope (SEM), and transmission electron microscope (TEM) techniques. The electrochemical properties of the prepared nanohybrids with various composition ratios were examined by cyclic voltammetry (CV), and the trace additives in food and/or beverage was detected by using differential pulse voltammetry (DPV). The experimental results indicated that the prepared nanohybrids for fabrication of electrochemical modified electrodes possess active electroresponse, marked redox current, and good electrochemical reversibility, which could be mediated by changing the system formulations. The nanohybrid modified electrode sensors had a good peak current linear dependence on the analyte concentration with a wide detection range and a limit of detection as low as about 1.35 × 10−9 mol L−1, and the amount of aspartame was measured to be 35.36 and 40.20 µM in Coke zero, and Sprite zero, respectively. Therefore, the developed nanohybrids can potentially be used to fabricate novel electrochemical sensors for applications in the detection of beverage and food safety. View Full-Text
Keywords: nanomaterials; carbon nanotubes; electrochemical properties; ferrocene derivatives; sensors nanomaterials; carbon nanotubes; electrochemical properties; ferrocene derivatives; sensors
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MDPI and ACS Style

Xu, J.-W.; Cui, Z.-M.; Liu, Z.-Q.; Xu, F.; Chen, Y.-S.; Luo, Y.-L. Organic–Inorganic Nanohybrid Electrochemical Sensors from Multi-Walled Carbon Nanotubes Decorated with Zinc Oxide Nanoparticles and In-Situ Wrapped with Poly(2-methacryloyloxyethyl ferrocenecarboxylate) for Detection of the Content of Food Additives. Nanomaterials 2019, 9, 1388.

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