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One-Pot Silver Nanoring Synthesis

Nicolas Drogat, Robert Granet*, Vincent Sol and Pierre Krausz

Author Affiliations

Laboratoire de Chimie des Substances Naturelles, Université de Limoges, EA 1069, 123 Avenue Albert Thomas, 87060, Limoges, France

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Nanoscale Research Letters 2009, 5:566-569  doi:10.1007/s11671-009-9505-5

Published: 16 December 2009


Silver colloidal nanorings have been synthesized by reducing silver ions with NaBH4 in trisodium citrate buffers. pH increase, by addition of NaOH, was used to speed up reduction reaction. The UV–vis absorption spectra of resulting silver nanorings showed two peaks accounting for transverse and longitudinal surface plasmon resonance, at ≈400 nm, and between 600 and 700 nm, respectively. The shapes of these silver nanoparticles (nanorings) depended on AgNO3/NaBH4 ratio, pH and reaction temperature. Particles were analysed by transmission electron microscopy, scanning electron microscopy and X-ray diffraction. A reaction pathway is proposed to explain silver nanoring formation.

Nanorings; Silver; Nanoparticles; Synthesis