Ultraviolet (UV) photodetectors are important tools in the fields of optical imaging, environmental monitoring and air and water sterilization, as well as flame sensing and early rocket plume detection. Herein, hexagonal-like Nb 2 O 5 nanoplates are synthesized using a facile solvothermal method. UV photodetectors based on single Nb 2 O 5 nanoplates are constructed and the optoelectronic properties have been probed. The photodetectors show remarkable sensitivity with a high external quantum efficiency (EQE) of 9617% and adequate wavelength selectivity with respect to UV-A light. In addition, the photodetectors exhibit robust stability and strong dependence of photocurrent on light intensity. Also, a low-cost drop-casting method is used to fabricate photodetectors based on Nb 2 O 5 nanoplate film, which exhibit singular thermal stability. Moreover, the hexagonal-like Nb 2 O 5 nanoplates show significantly better photocatalytic performances in decomposing Methylene-blue and Rhdamine B dyes than commercial Nb 2 O 5 .
Niobium-based oxides with wide bandgap and high dielectric constant show great potential in the applications of electronic and optoelectronic devices. Herein, the quasi-van der Waals epitaxial growth of 2D α-Nb 2 O 5 nanosheets is reported, in which the growth promoter of sulfur and alkali halides has been utilized to catalyze the ultrathin 2D growth. The relatively low Gibbs free energy of α-Nb 2 O 5 nanosheets can drive the ultrathin growth down to 30 nm on the c-Al 2 O 3 substrate by the transformation of T-Nb 2 O 5 powder sources without any doping effects, demonstrating the diverse α-Nb 2 O 5 nanostructure morphologies. The as-grown α-Nb 2 O 5 nanosheets are characterized with high crystalline quality and specific dominated growth plane, indicating the uniform dielectric properties. The metal–insulator–metal capacitor has confirmed the α-Nb 2 O 5 nanosheet with a high dielectric constant over 40. The dual promoters’ growth design strategy provides a universal synthesis method for the 2D nonlayered dielectric materials.
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