Abstract
Gold nanoparticles functionalized with self-assembled films of ferrocenylhexanethiol and mercaptoundecanoic acid (MUA) were used for the determination of ascorbic acid (AA). The modified nanoparticles (mNPs) were prepared by a combination of the modified Schifrin’s and the place-exchange methods. Well-organized films were obtained due to electrostatic attraction between the carboxy groups of MUA and cationic surface of poly(diallyldimethylammonium chloride). The mNP films are highly stable and can be exploited to fabricate an enzyme-less sensor for AA whose function is based on the highly electrocatalytic activity of ferrocene in the mNPs towards AA. The sensor was characterized by cyclic voltammetry and chronoamperometry. Under optimal conditions, the response current towards AA is proportional to its concentration in the range from 8.0 μM to 6.0 mM, with a detection limit of 0.14 μM (at a signal-to-noise ratio of 3). This work represents a simple controlled test-bed for fundamental studies on the use of self-assembled mNPs for sensor applications.
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This work was supported by National Natural Science Foundation of China under Grant 20543003 and Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry of China.
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Shi, H., Xu, Y., Wang, Y. et al. Assembly of ferrocenylhexanethiol functionalized gold nanoparticles for ascorbic acid determination. Microchim Acta 171, 81–89 (2010). https://doi.org/10.1007/s00604-010-0410-5
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DOI: https://doi.org/10.1007/s00604-010-0410-5