Monodispersed Nb₂O₅ Microspheres: Facile Synthesis, Air/Water Interfacial Self‐Assembly, Nb₂O₅‐Based Composite Films, and Their Selective NO₂ Sensing

Monodispersed Nb2O5 microspheres, synthesized by a one-step solvothermal method, rapidly self-organize into large-scale (cm2 level) layer-controlled homogenous films by a facile butanol-assisted air/water interfacial self-assembly approach. Further, a novel air/solution interfacial route is presented to obtain composite materials, and In2O3-Nb2O5 hybrid films achieve promoted NO2 sensing performances at low temperature (200 °C) with high sensitivity and good selectivity.