A series of high quality NixMg1-xO bowl-shaped array films are successfully prepared by a simple one-step assembly of polystyrene colloidal spheres and metal oxide precursors at oil-water interface, and further used to fabricate nanodevices. The doping of Mg2+ can greatly enhance the current and spectrum responsivity of NiO film-based nanodevice. The maximum R value of these bowl-shaped NixMg1-xO film-based devices measured in the study shows 4-5 orders of enhancement than the previously reported NixMg1-xO film at equal doping.