The formation of 1D nanostructures is strongly related to the crystallisation process. Thus, the aggregation of nuclei through homogeneous nucleation initiates the formation of building blocks that can serve as seeds for the growth and formation of 1D structures. Materials with polar surfaces preferentially grow to 1D structures . Synthetic strategies for obtaining 1D nanostructures can be classified by the form of growth. Symmetry can be controlled in several ways, such as the introduction of a liquid-solid interface and the addition of models with 1D morphology to induce growth. In this sense, controlling the amount of reagent or even the addition of a coating causes the growth rates of the facets to be kinetically controlled, and finally we can also mention the self-assembly of 0D structures . Thus, wet synthesis has intrinsic advantages, such as the use of a wide range of solvents, precursors, stabilising agents, and anionic/cationic surfactants . Examples of hydro(solvo)thermal growth for diverse 1D materials are summarised in Table . TiO2 + KOH heated in a microwave oven with a maximum power of 1200 W, at a pressure of 22 bars for 15 min. poly(ethylene glycol) + AgNO3 + HAuCl4