Poly(diallyldimethylammonium chloride)-cellulose nanocrystals supported Au nanoparticles for nonenzymatic glucose sensing

Document Type

Article

Publication Date

1-1-2016

Abstract

Poly(diallyldimethylammonium chloride)-cellulose nanocrystal (PDDA-CNC) supported Au nanohybrids were prepared by in situ deposition, via the self-assembly between negative Au precursor and positively charged functional groups of PDDA-CNC. The Au/PDDA-CNC nanohybrids were characterized for their structural properties and for glucose sensing. Characterization studies show that the synthesis protocol led to well distribution of Au nanoparticles with a mean particle size varying from 3.5 to 8.4 nm on the PDDA-CNC support matrix depending on the Au concentration. The 5Au/PDDA-CNCs (i.e., Au loading level of 5 wt%) exhibited the best glucose sensing ability with a low detection limit of 2.4 μM (S/N = 3), high sensitivity of 62.8 μA mM-1 cm-2, a linear detection range from 0.004 mM to 6.5 mM, which was ascribed to the moderate size and dispersity of the Au nanoparticles. Further investigation revealed that the 5Au/PDDA-CNC nanohybrids also showed high selectivity and stability. These results suggest a new utilization route of CNCs decorated with metal nanoparticles in electrochemical biosensing.

Publication Source (Journal or Book title)

RSC Advances

First Page

6436

Last Page

6442

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