Electrochemical sensor based on a polyaniline-modified SnO2 nanocomposite for detecting ethephon
| Autor: | Zhihong Zhang, Hongzhong Zhang, Shaoming Fang, Shunli Liu, Donglai Peng, Yanqin Yang, Shuyong Zhai, Minghua Wang, Linghao He |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Nanocomposite General Chemical Engineering General Engineering Analytical chemistry Nanoparticle Infrared spectroscopy Analytical Chemistry Electrochemical gas sensor chemistry.chemical_compound chemistry X-ray photoelectron spectroscopy Polymerization Chemical engineering Polyaniline Ethephon |
| Zdroj: | Analytical Methods. 7:4725-4733 |
| ISSN: | 1759-9679 1759-9660 |
| DOI: | 10.1039/c5ay01028d |
| Popis: | Ethephon is a plant growth regulator and is often applied in the process of fruit growth. It could result in considerable inhibition of cholinesterase in blood plasma and erythrocytes and is very harmful to human beings on excessive consumption. Nanocomposites from polyaniline and stannic oxide (SnO2@PANI) were synthesized and developed as the electrode material for detecting ethephon. Herein, SnO2 nanoparticles were prepared by the method of liquid phase precipitation. Afterwards, the as-prepared SnO2 nanoparticles were mixed with the aniline polymerization system to form the SnO2@PANI nanocomposite. The basic chemical components of the fabricated sensor were characterized in detail using Fourier-transform infrared spectroscopy and X-ray photoelectron spectroscopy. It was demonstrated that the developed SnO2@PANI nanocomposite exhibits good electrochemical performance with relatively low charge-transfer resistance. Compared with the pristine SnO2 and PANI, ethephon preferred to adsorb onto the SnO2@PANI nanocomposite surface because of the synergic interaction between the two components of SnO2 and PANI. The electrochemical impedance spectra illustrated that the fabricated ethephon sensor had excellent sensitivity, with a detection limit of 4.76 pg mL−1 within the range from 0.01 to 5 ng mL−1. Moreover, the developed electrochemical biosensor exhibits good selectivity and stability. All of these good performances provide a promising tool to detect illegal food additives. |
| Databáze: | OpenAIRE |
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