We know that silver assists in the formation of gold nanorods and length of the rods is dependents on the concentration of AgNO3. But what happens to silver once the nanorods are formed??? Where does it go??? Is it still there?
Silver reacts with Bromide from CTAB forming AgBr, directing the formation of Au NR formation through underpotential deposition.
(1) Gold nanorods: Synthesis, characterization and applications, Jorge Perez-Juste et al. 2005.
(2) Colloidal dispersion of gold nanorods: Historical background, optical properties, seed-mediated synthesis, shape separation and self-assembly, Vivek Sharma et al. 2009.
These two reviews should give you more information about AgNO3 in GNR formation.
Missed out the actual answer in my previous post. This AgBr forms a complex with the CTAB and that complex acts as a capping agent for the GNRs. So, the silver goes nowhere but stays on the GNR surface!
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