Inhibition of the Growth of Au Nanoparticles for Xanthine Sensing: Spectral and Electrochemical Studies on the Interactions between Xanthine and Au(III) Ions

Abstract:

The role of xanthine in the growth process of Au nanoparticles (AuNPs) was clarified by Uv-vis absorption spectra, resonance light scattering (RLS) spectra, cyclic votlammetry (CV), and differential pulse voltammetry (DPV). In a growth solution containing 0.01 M phosphate buffer solution (PBS, pH 7.4), 24.3 μM HAuCl₄, and 2 mM cetyltrimethylammonium chloride (CTAC), the AuNPs were produced by tannic acid (TA) reduction. The growth of AuNPs was inhibited by the addition of xanthine. The plasmon absorbance band of AuNPs is blue shifted, indicating that larger sized AuNPs were grown in the presence of xanthine. Both the absorbance at 555 nm and RLS intensity at 652 nm of the grown AuNPs decreased linearly with increasing concentrations of xanthine. The linear regression equation are A=1.865−0.016 C_xanthine and I=397.8−4.617C_xanthine for absorbance and RLS intensity, respectively. The results of CV and DPV reveal that the inhibition effect of xanthine on the growth of AuNPs may attribute to the formation of xanthine-Au(III) complex. The conditional stability constants of the complexes were determined to be 2.22×10⁵.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 1562-1567
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.1562
• Online since: May 2011
• Authors: Hong Cheng Pan, Dun Nan Li, Jiang Tao Liu, Jian Ping Li, Wen Yuan Zhu, Rong Jing Cui
• Keywords: Au Nanoparticle, Cyclic Voltammetry (CV), Differential Pulse Voltammetry, Resonance Light Scattering, Xanthine

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