Hexagonal-like Nb2O5 Nanoplates-Based Photodetectors and Photocatalyst with High Performances

Abstract

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 Nb2O5 nanoplates are synthesized using a facile solvothermal method. UV photodetectors based on single Nb2O5 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 Nb2O5 nanoplate film, which exhibit singular thermal stability. Moreover, the hexagonal-like Nb2O5 nanoplates show significantly better photocatalytic performances in decomposing Methylene-blue and Rhdamine B dyes than commercial Nb2O5.

Synthesis of Nb2O5 Nanoplates and their Conversion into NbO2F Nanoparticles by Controlled Fluorination with Molecular Fluorine

“…The sharp and well resolved peaks match, exclusively, with the standard powder XRD pattern of hexagonal Nb 2 O 5 given in the JCPDS through PDF No [00–007–0061]. Contrary to a previous report, the Nb 2 O 5 is achieved in single phase i.e., hexagonal. Employing the Scherrer's equation [ d = 0.94λ/βcosθ , where d is the mean crystallite size, λ is the X‐rays wavelength (1.542 Å), β is the full width at half maximum and θ is the angle of diffraction], the average crystallite size of 35 ± 1 nm was calculated for the Nb 2 O 5 nanostructures.…”

“…The hexagonal shaped, plate‐like, nanostructures of Nb 2 O 5 were fabricated by modifying the previously reported method . The modifications in the synthesis method were introduced to ensure formation of single‐phase uniform nanostructures of Nb 2 O 5 .…”

Nanohybrids of Two‐Dimensional Transition‐Metal Dichalcogenides and Titanium Dioxide for Photocatalytic Applications

“…Up to now,s everal semiconducting materials including TiO 2 , [15] ZnO, [16] Nb 2 O 5 , [17] CdS, [18] CuInS 2 , [19] and CdSe [20] have been utilized for photocatalytic hydrogen production. Among these semiconductors, TiO 2 is the most famousm ember that has received widespread attention for photocatalytic applications mainlyd ue to its strong redox ability,a bundant availability, and extraordinary stability under harsh photocatalytic reactions.…”

Sonochemical synthesis of CuO nanostructures and their morphology dependent optical and visible light driven photocatalytic properties

“…There are several semiconductor nanostructures like CuO, Fe 2 O 3 , ZnO, ZnS, CuS, Nb 2 O 5 and TiO 2 have been developed for the photocatalytic degradation of various organic pollutants [21][22][23][24][25][26][27]. Among these semiconductors, CuO nanostructure is a potential candidate for the catalytic activities due to its higher surface area and ease tuning of size and shape [28].…”