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  • Title: Preparation of gold nanoparticles/functionalized multiwalled carbon nanotube nanocomposites and its glucose biosensing application.
    Author: Li F, Wang Z, Shan C, Song J, Han D, Niu L.
    Journal: Biosens Bioelectron; 2009 Feb 15; 24(6):1765-70. PubMed ID: 18951009.
    Abstract:
    Gold nanoparticles stabilized by amino-terminated ionic liquid (Au-IL) have been in situ noncovalently deposited on poly(sodium 4-styrene-sulfonate) (PSS)-functionalized multiwalled carbon nanotubes (MWCNTs) to form a MWCNTs/PSS/Au-IL nanocomposite. PSS can interact with MWCNTs through hydrophobic interaction. Amino-terminated ionic liquid was applied to reduce aqueous HAuCl(4), and the resulting gold nanoparticles were attached to the PSS-functionalized MWCNTs simultaneously. Most gold nanoparticles dispersed well on the functionalized MWCNTs. Transmission electron microscopy, Raman and X-ray photoelectron spectroscopy were used to confirm the composition and structure of the nanocomposites. The resulting MWCNTs/PSS/Au-IL composite exhibits good electrocatalysis toward oxygen and hydrogen peroxide reduction. And good biocompatibility with glucose oxidase was also demonstrated due to its good biocatalysis toward glucose substrate, which offered a friendly environment for the immobilization of biomolecules. Such bionanocomposite provides us potential applications in fabrication of biosensors. The resulting biosensor exhibits good response to glucose with a low detection limit 25 microM. It also has excellent reproducibility, satisfied operational stability and good storage stability.
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