The gold nanobipyramids (GNBPs) have attracted wide attention in field of sensing, biomedicine, catalysis and optoelectronics due to strong local electric field enhancement and surface plasmon resonance originated from their sharp tips. In GNBPs synthesis process, CTAB is usually used as a surfactant which plays a role as capping and stabilizing agents. However, CTAB surfactant is known as a toxic and thus hindering the GNBPs application in a biomedical related research. In this paper, for the first time we reported the simplest approach for surface modification of CTAB surfactant capped GNBPs using an amine functionalization or known as amine functionalized GNBPs. The optical properties and functionalization mechanism were investigated in this paper. In addition, the detailed understanding of the GNBPs-amine bond and its physical arrangement also were explained in this work. The amine functionalized GNBPs systems have exciting potential applications in the field of biosensing and in targeted drug delivery platforms.
