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Since the global energy demand increases annually, a great need is arising in energy-related technologies. Photocatalysis plays a major role in these technologies, as it exploits one of the renewable types of energy, solar energy. For this reason, there is a plethora of scientific investigations in the research field of photocatalysis. In particular, the variety of materials that could be employed to efficiently enhance the procedure, is extensively studied. One of the most widely used materials is titania (TiO 2 ) due to its efficiency in photocatalysis [1] , while maintaining and other notable properties such as non-toxicity, chemo-stability, enhanced electronic and optical characteristics.

We present our investigations on the fabrication of three-dimensional nanostructures by direct laser writing using organic-inorganic hybrid materials that (i) can be structured accurately to sub-100nm, (ii) contain quantum dots, and (iii) can be selectively covered with metal.

We present our most recent results on the fabrication of 3D high-resolution nanostructures containing Cadmium Sulfide (CdS) quantum dots (QDs) and exhibiting higher order diffraction patterns and stop-gaps at visible wavelengths. These are fabricated using direct laser writing (DLW) and novel, organic-inorganic hybrid materials.