Molecular linker-mediated self-assembly of gold nanoparticles: understanding and controlling the dynamics.
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This study sheds light on the mechanism and dynamics of self-assembly of gold nanoparticles (AuNPs) using molecular linkers such as aminothiols. An experimental model is established that enables a fine control and prediction of both assembly rate and degree. Furthermore, we have found that under certain conditions, the increase in the molar ratio of linker/AuNPs beyond a certain threshold unexpectedly and dramatically slows down the assembly rate by charge reversal of the surface of nanoparticles. As a result, the assembly rate can be easily tuned to reach a maximum growth within seconds to several days. The decrease of the same molar ratio (linker/AuNPs) below a certain value leads to self-termination of the reaction at different phases of the assembly process, thus providing nanoparticles chains of different length. This work introduces new handles for a rational design of novel self-assembled architectures in a very time-effective manner and contributes to the understanding of the effect of the assembly morphology on the optical properties of gold nanoparticles.
author list (cited authors)
Abbas, A., Kattumenu, R., Tian, L., & Singamaneni, S.
complete list of authors
Abbas, Abdennour||Kattumenu, Ramesh||Tian, Limei||Singamaneni, Srikanth