Effects of surfactant concentration on formation of high-aspect-ratio gold nanorods

[Display omitted] •Gold nanorods (aspect ratio >20) were synthesized with a modified seeding method.•Longer nanorods grow at higher surfactant concentrations.•Surfactant self-assemblies were analyzed using small-angle X-ray scattering.•Complex formation of gold ions with HTAB micelles suppresses...

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Veröffentlicht in:Journal of colloid and interface science 2013-10, Vol.407, p.265-272
Hauptverfasser: Takenaka, Yoshiko, Kawabata, Youhei, Kitahata, Hiroyuki, Yoshida, Masaru, Matsuzawa, Yoko, Ohzono, Takuya
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Sprache:eng
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Zusammenfassung:[Display omitted] •Gold nanorods (aspect ratio >20) were synthesized with a modified seeding method.•Longer nanorods grow at higher surfactant concentrations.•Surfactant self-assemblies were analyzed using small-angle X-ray scattering.•Complex formation of gold ions with HTAB micelles suppresses secondary nucleation.•Suppressing secondary nucleation is important to elongate gold nanorods. The effects of surfactant concentration in a growth solution on the elongation of gold nanorods were examined. Gold nanorods were synthesized in solutions with different concentrations of hexadecyltrimethylammonium bromide (HTAB): 100, 200, 300, 400, 500, and 600mM. The nanorods grown in a solution with higher surfactant concentrations were longer (aspect ratio ∼30) than those grown in that with lower concentrations (aspect ratio
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2013.06.008