title: Using binary surfactant mixtures to simultaneously improve the dimensional tunability and monodispersity in the seeded growth of gold nanorods.
abstract: We report a dramatically improved synthesis of colloidal gold nanorods (NRs) using a binary surfactant mixture composed of hexadecyltrimethylammonium bromide (CTAB) and sodium oleate (NaOL). Both thin (diameter <25 nm) and thicker (diameter >30 nm) gold NRs with exceptional monodispersity and broadly tunable longitudinal surface plasmon resonance can be synthesized using seeded growth at reduced CTAB concentrations (as low as 0.037 M). The CTAB-NaOL binary surfactant mixture overcomes the difficulty of growing uniform thick gold NRs often associated with the single-component CTAB system and greatly expands the dimensions of gold NRs that are accessible through a one-pot seeded growth process. Gold NRs with large overall dimensions and thus high scattering/absorption ratios are ideal for scattering-based applications such as biolabeling as well as the enhancement of optical processes.
authors.affiliation: Department of Chemistry, University of Pennsylvania, Pennsylvania 19104, USA.
authors.forename: Xingchen
authors.initials: X
authors.lastname: Ye
authors.forename: Chen
authors.initials: C
authors.lastname: Zheng
authors.forename: Jun
authors.initials: J
authors.lastname: Chen
authors.forename: Yuzhi
authors.initials: Y
authors.lastname: Gao
authors.forename: Christopher B
authors.initials: CB
authors.lastname: Murray