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Issue 14, 2018
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Non-enzymatic sensors based on a glassy carbon electrode modified with Au nanoparticles/polyaniline/SnO2 fibrous nanocomposites for nitrite sensing

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Abstract

A non-enzymatic sensor based on Au nanoparticles (AuNPs)/polyaniline (PANI)/tin oxide (SnO2) nanocomposites (Au/PANI/SnO2) was prepared for enhanced electrochemical sensing of nitrite (NO2). The nanocomposite was designed purposely to combine the virtues of noble metal, conducting polymer and metal oxides. The obtained nanocomposite has been confirmed by a series of characterization techniques such as field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and electrochemical techniques. The results showed that a large number of AuNPs (about 5 nm) with spherical morphologies were distributed on the fibrous surface of PANI–SnO2, which made the sensor exhibit an excellent response to NO2 detection with a wide linear range of 0.25 μM to 2.4 mM, a sensitivity of 0.08314 μA μM−1 cm−2 and a low detection limit of 0.08 μM (S/N = 3). Moreover, this sensor also exhibited good selectivity, stability and repeatability. Therefore, Au/PANI/SnO2 promised to be a new platform for the electrochemical detection of NO2.

Graphical abstract: Non-enzymatic sensors based on a glassy carbon electrode modified with Au nanoparticles/polyaniline/SnO2 fibrous nanocomposites for nitrite sensing

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Publication details

The article was received on 25 Mar 2018, accepted on 25 May 2018 and first published on 28 May 2018


Article type: Paper
DOI: 10.1039/C8NJ01461B
Citation: New J. Chem., 2018,42, 11516-11524
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    Non-enzymatic sensors based on a glassy carbon electrode modified with Au nanoparticles/polyaniline/SnO2 fibrous nanocomposites for nitrite sensing

    C. Duan, W. Bai and J. Zheng, New J. Chem., 2018, 42, 11516
    DOI: 10.1039/C8NJ01461B

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