Specific features of the seedless synthesis of gold nanoparticles in micellar solutions of both individual alkyltrimethylammonium bromides with different hydrocarbon chain lengths and their mixtures have been studied. The main attention has been focused on studying the possibility of controlling the shape and, consequently, the position of the localized surface plasmon resonance of the nanoparticles in the presence of octadecyltrimethylammonium bromide (OTAB). It has been found that its use leads to the formation of monodisperse gold nanorods with a larger aspect ratio than that in the case of cetyltrimethylammonium bromide, which is commonly used for this purpose. Moreover, it has been shown that the introduction of OTAB into micellar solutions of its homolog with a noticeably shorter alkyl chain (dodecyltrimethylammonium bromide) promotes a change in the shape of the formed gold nanoparticles from spherical to rodlike one.
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