Abstract
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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Notes
Unfortunately, the authors of [12] have reported no data on the aspect ratio of particles formed at each of these stages. In our opinion, this information would enable one to gain a deeper insight into the effect of variations in n on the character of GNR growth.
The presence of this interaction is evidenced by both the results of [21] devoted to studying hydroquinone adsolubilization on the surface of SiO2 particles coated with CTAB and our data, according to which, the addition of hydroquinone to a CTAB solution leads to an increase in the size of micelles of this surfactant [4].
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The work was carried out within the framework of the order of the Ministry of Science and Higher Education of the Russian Federation and was supported by the Russian Foundation for Basic Research (project no. 20-33-90266).
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Dement’eva, O.V., Matsur, V.A., Zaikin, A.S. et al. Octadecyltrimethylammonium Bromide Micelles as a Template in the Seedless Synthesis of Gold Nanorods. Colloid J 84, 689–695 (2022). https://doi.org/10.1134/S1061933X22600312
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DOI: https://doi.org/10.1134/S1061933X22600312