Journal
NANOSCALE RESEARCH LETTERS
Volume 5, Issue 3, Pages 566-569Publisher
SPRINGEROPEN
DOI: 10.1007/s11671-009-9505-5
Keywords
Nanorings; Silver; Nanoparticles; Synthesis
Funding
- Conseil Regional du Limousin
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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 a parts per thousand 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.
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