Introducing longitudinal oxidation reaction for ultrarapid and single-step synthesis of thiol-mediated end-to-end assembly of gold nanorods
Source abstract
Abstract
The end-to-end (EE) assembly of gold nanorods (Au-NRs) is of immense interest as it offers great electro-optical properties. This assembly is mainly produced in solution via replacing the cetyltrimethylammonium bromide (CTAB) molecules from as-synthesized Au-NR tips with thiolated linker molecules. However, this replacement demands a centrifugation-driven two-step ligand exchange reaction, till date, which is cumbersome, demands a few hours to even a day to occur, and often hampers the stability of Au-NRs during the process. Herein, we present a simple and fast one-step strategy that relies on the ferric chloride–mediated longitudinal oxidation of Au-NRs as an innovative mode to facilitate the in situ exchange of CTAB with thiols at the Au-NR tips to produce the Au-NR EE-assembly in an aqueous medium. We find that the temperature has a strong impact on our approach and it does not require any prior washing of as-synthesized Au-NRs via conventional centrifugation or any other modes. Our principle observation is that incubation of as-synthesized Au-NRs and thiolated linkers (e.g., cysteine, glutathione) in an acidic solution (pH = 1.3) in the presence of FeCl3 for just 10 min at 75 °C is sufficient to achieve EE-nanoassemblies. We also notice that it is easy to control the extent of assembly by modulating either the FeCl3 amount or temperature. To assess this assembly, we have used Vis–NIR absorption spectroscopy, dynamic light scattering study, and transmission electron microscopy. Such rapid and one-step fabrication of EE-assembly of Au-NRs is indeed rare in the literature and establishes the novelty of this work. Graphical abstract
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Gold and Silver Nanoparticles Synthesis and Applications · Advanced Nanomaterials in Catalysis · Nanocluster Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (55)
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