Ring stain effect at room temperature in silver nanoparticles yields high electrical conductivity

Shlomo Magdassi*, Michael Grouchko, Dana Toker, Alexander Kamyshny, Isaac Balberg, Oded Millo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

We demonstrate that metallic rings formed spontaneously at room temperature via evaporation of aqueous drops containing silver nanoparticles (20-30 nm in diameter) exhibit high electrical conductivity (up to 15% of that for bulk silver). The mechanism underlying this self-assembly phenomena is the "ring stain effect", where self-pinning is combined with capillary flow to form a ring consisting of close-packed metallic nanoparticles along the perimeter of a drying droplet. Our macroscopic and microscopic (applying conductive atomic force microscopy) transport measurements show that the conductivity of the ring, which has a metallic brightness, is orders of magnitude larger than that of corresponding aggregates developed without the ring formation, where high conductivity is known to appear only after annealing at high temperature.

Original languageAmerican English
Pages (from-to)10264-10267
Number of pages4
JournalLangmuir
Volume21
Issue number23
DOIs
StatePublished - 8 Nov 2005

Fingerprint

Dive into the research topics of 'Ring stain effect at room temperature in silver nanoparticles yields high electrical conductivity'. Together they form a unique fingerprint.

Cite this