Films of metallic nanowires are of interest for the fabrication of optical filters; when assembled on a fluid interface and grafted by stimuli-responsive moieties, they could exhibit on-demand reconfigurability, thereby providing access to stimuli-tunable filters. Here, we explore the assembly over water of Pt and Au nanowires decorated at specific locations by chemical functions which can be modified by pH stimuli. The nanowires are synthesized by electrochemical deposition in nanoporous membranes, typically polycarbonate membranes, leading to nanowires of controlled diameter, length and composition. This templating methodology simultaneously allows us to modify specific parts of the nanowire surface such as their bases or lateral face [see Figure 1] with a wide range of chemical functions, using either thiol assembly or polyelectrolyte adsorption. Then, the spatially-decorated nanowires are assembled in a film at the oil/water or air/water fluid interface, and can be transferred to a solid substrate for characterization. We discuss the assembly of the nanowires in films of varying degrees of order, depending on their assembly method and on their spatial functionalization. One of the key parameters in the assembly is the type of chemical functions grafted on the nanowires, which can control ordering while avoiding 3D aggregation when properly selected.

Self-assembly of spatially-decorated metallic nanowires on a fluid interface

256th National Meeting (2018)

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