Abstract
Abstrat In this study, we use the material containing bis(quaternary ammonium bromide) surfactant DC14TAB to promote formation of multiple tips echinus-like gold nanostructure. For the growth mechanism, we find that the lipid-like property of this surfactant promotes the formation of echinus-like structure. From the experiment result, this structure may be formed first by aggregation of small nanoparticles, followed by growth into multiple tips echinus structure in the presence of dimeric surfactant DC14TAB as the structure- directing agent. According to the lightning rod effect, multiple long tips structure on the surface of this particle will produce strong local electric field, this property can be used to enhance the Raman signal of surface absorbed organic molecule on the Au nanoechinus . We compare the intensity of Raman signal generated from Au nanoechinus with that from spherical Au NPs. The good signal enhancement of this particle show that it would be the potential candidate for the Raman signal enhancement substrate.