Fabrication and photosensitive property of CdS nanorods/ TiO2 nanorods structure grown on silica micropillars array

A kind of Cadmium sulfide (CdS) nanorods/Titanium dioxide (TiO 2 ) nanorods heterojunction structure is prepared successfully on the silica micropillar arrays surface. The TiO 2 nanorods densely coat the silica micropillar surfaces, while CdS nanorods are mainly anchored atop the TiO 2 nanorods. Both the CdS and TiO 2 nanostructures exhibit high crystallinity, with a well-defined heterojunction formed at their interface. This bilayer architecture significantly can suppress reflection across the visible and ultraviolet spectral regions, thereby enhancing light absorption. The bilayer structure substantially outperforms single-layer CdS nanorods or TiO 2 nanorods photoresistors, achieving a visible-light responsivity of 241 and a UV responsivity of 33.2 (the photoresistor in dark dividing the resistance exposed to light). • CdS nanorods / TiO 2 nanorods are made on silica micropillar surface. • This structure is used for visible-light and UV photoresistor. • CdS and TiO 2 nanostructures form well-defined heterojunction. • This structure has good photosensitive performance.