Journal article

Luminescence of tiopronin monolayer-protected silver clusters changes to that of gold clusters upon galvanic core metal exchange

T Huang, RW Murray

The Journal of Physical Chemistry B | Published : 2003

Abstract

Water-soluble tiopronin monolayer-protected silver clusters (Ag MPCs), with 1.6 nm average diameter cores, exhibit visible luminescence at 500 nm with a quantum yield estimated near 10 when excited at 400 nm. The Ag MPCs become organic-soluble upon conversion to poly(ethylene glycol) quaternary ammonium salts of the carboxylates of the N-2-mercaptopropionylglycine ligand monolayer. The Ag MPC luminescence becomes more intense in nonpolar organic solvents. The luminescence may arise from interband recombination transitions between the d band and the sp conduction band. Atoms in the Ag MPC core can be replaced by Au atoms via a galvanic metal exchange reaction between the silver clusters and ..

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University of Melbourne Researchers

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