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Issue 23, 2017
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Exploration of carboxymethyl guargum grafted hyperbranched poly(acrylic acid) as a scaffold for silver nanoparticles for ultrafast and selective sensing of Hg(II)

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Abstract

Carboxymethyl guargum-g-poly(acrylic acid)-co-poly(divinyl benzene), bCMGG-g-HBPAA, having an unprecedented hyperbranched architecture is developed. A combination of a polymer grafting technique and “Strathclyde methodology” in emulsion is followed for the first time in the synthesis of bCMGG-g-HBPAA. FTIR, NMR, intrinsic viscosity and linear viscoelasticity studies confirm the microstructure of bCMGG-g-HBPAA. Owing to the unique properties of polysaccharide and hyperbranched chains, bCMGG-g-HBPAA successfully stabilizes monodispersed silver nanoparticles (AgNPs-HB) of size 27 nm and with good optical clarity. AgNPs-HB forms an amalgam in the presence of Hg2+ and thus facilitates colorimetric detection/accurate estimation of Hg2+ (up to 1 ppb). Furthermore, for the first time it is shown that the specificity and sensitivity of AgNPs-HB based sensors towards Hg2+ sensing can be enhanced in the presence of Na salt catalysts. The working principle of AgNPs-HB and AgNPs-HB/Na salt(s) based sensors for Hg2+ is explained through UV-Vis, XRD, HRTEM and CV studies.

Graphical abstract: Exploration of carboxymethyl guargum grafted hyperbranched poly(acrylic acid) as a scaffold for silver nanoparticles for ultrafast and selective sensing of Hg(ii)

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Publication details

The article was received on 28 Aug 2017, accepted on 25 Oct 2017 and first published on 25 Oct 2017


Article type: Paper
DOI: 10.1039/C7NJ03237D
Citation: New J. Chem., 2017,41, 14379-14389
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    Exploration of carboxymethyl guargum grafted hyperbranched poly(acrylic acid) as a scaffold for silver nanoparticles for ultrafast and selective sensing of Hg(II)

    T. Das, S. Sengupta, A. Dey, A. Pal, S. Saha and A. Bandyopadhyay, New J. Chem., 2017, 41, 14379
    DOI: 10.1039/C7NJ03237D

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