Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 303, Issue 3, Pages 184-190Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2007.03.050
Keywords
Ag; colloid; chemical synthesis; transmission electron microscopy
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Herein we report a 'one pot' facile method for environmentally benign production of stable Ag colloids, using short chain polyethylene glycol as solvent, reducing agent and stabilizer. Stable spherical metal particles 15-30 nm in diameter with a well-crystallized structure were obtained at 30 degrees C. Heating to 60 degrees C resulted in increased spherical sizes, and heating over 90 degrees C led to a mixture of shapes: smaller spherical crystallites and bigger triangular and pentagonal nano-sized prisms. The stability of the Ag colloids submitted to normal chemical laboratory light over a 6-month period was monitored by UV-vis and electron microscopy. The colloids prepared at 30 and 60 degrees C were stable, while in the colloids obtained at 120 degrees C we observed significant particle growth and aggregation of nanoparticle assemblies sized up to several micrometers. (c) 2007 Elsevier B.V. All rights reserved.
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