Tetraoctylammonium bromide (TOAB) has been used as a phase transfer agent to transfer gold tetrachloroaurate from aqueous phase to organic phase in a two-phase (organic-aqueous) method of alkanethiol stabilized gold nanoparticle synthesis.[2]It is also used to prepare TOAB-capped gold nanoparticles which shows well-defined plasmon absorption compared to thiol-capped nanoparticles.

For R&D use onlynot for drug household or other uses.

Tetraoctylammonium bromide is an organic surface coating agent commonly used to control the size and shape during nanoparticle synthesis.