We describe a method of controlled evaporation on a textured substrate for self-assembling and shaping gold nanorods based materials. Tridimensional wall features were formed over areas as large as several square millimeters. Furthermore, analyses by small angle X-ray scattering and scanning electron microscopy techniques demonstrated that colloids are locally ordered as a smectic B. Such crystallization was in fact possible because we could finely adjust the nanoparticle charge, a know-how which additionally enables to tune the lattice parameters. In the future, the kind of ordered self-assemblies of gold nanorods we have prepared could be used for amplifying optical signals.
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