tailieunhanh - Báo cáo hóa học: " One-Pot Silver Nanoring Synthesis"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: One-Pot Silver Nanoring Synthesis | Nanoscale Res Lett 2010 5 566-569 DOI S11671-009-9505-5 NANO EXPRESS One-Pot Silver Nanoring Synthesis Nicolas Drogat Robert Granet Vincent Sol Pierre Krausz Received 13 October 2009 Accepted 1 December 2009 Published online 16 December 2009 The Author s 2009. This article is published with open access at Abstract 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. Keywords Nanorings Silver Nanoparticles Synthesis Introduction Nanoscale materials and structures for high value applications is an emerging area of nanoscience and nanotechnology. Nanomaterials usually ranging from 1 to 100 nanometers nm may provide solutions to technological and environmental challenges in the areas of solar energy conversion catalysis medicine and water treatment 1 . Among such materials silver nanoparticles have been N. Drogat R. Granet H V. Sol P. Krausz Laboratoire de Chimie des Substances Naturelles Universite de Limoges EA 1069 123 Avenue Albert Thomas 87060 Limoges France e-mail intensively studied because of their intriguing optical electronic mechanical and bactericidal properties 2 . Several techniques have been employed for the synthesis of noble metal nanoparticles such as gas evaporation arc plasma sputtering electrochemical methods laser ablation 3 etc. This communication describes the synthesis of silver .