Journal
CRYSTALS
Volume 12, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/cryst12030371
Keywords
polymer matrix composite; thermal analysis; sol-gel methods; ion sensor; environment safety
Funding
- deanship of Scientific Research (DSR) at King Abdulaziz University, Jeddah [G-31-130-1442]
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This study used the sol-gel process to create a novel polypyrrole-Stannous(II)tungstate nanocomposite and successfully developed a chemical sensor for selective detection of Hg2+ ions using this material as electrode modification. The sensor demonstrated rapid reaction, long-term stability, ultra-low detection limit, exceptional sensitivity, and excellent reproducibility and repeatability.
The sol-gel process was used to create a new type of polypyrrole-Stannous(II)tungstate nanocomposite by poly(N-methyl pyrrole (PNMPy) sol in Stannous(II)tungstate gel, produced separately using sodium silicotungstic acid and Tn(II)chloride. Tin(II)tungstate (SnWO3) was made by changing the mixing volume ratios of SnWO3 and with a constant amount of an organic polymer. The composite was characterized by TGA, XRD, FTIR, and SEM measurements. A commercially available glassy carbon electrode (GCE) was modified with PNMPy/nano-Stannous(II)WO3 nanocomposites to create a chemical sensor for selective detection of Hg2+ ions using an effective electrochemical methodology. In the I-V technique, selectively toxic Hg2+ ion was targeted selectively, which shows a rapid reaction toward PNMPy/nano-Stannous(II)WO3/Nafion/GCE sensor. It also demonstrates long-term stability, an ultra-low detection limit, exceptional sensitivity, and excellent reproducibility and repeatability. For 0.1 mM to 1.0 nM aqueous Hg2+ ion solution, a linear calibration plot (r(2): 0.9993) was achieved, with a suitable sensitivity value of 2.8241 AM(-1) cm(-2) and an extraordinarily low detection limit (LOD) of 3.40.1 pM (S/N = 3). As a result, the cationic sensor modified by PNMPy/nano-Stannous(II)WO3/GCE could be a promising electrode.
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