Facile Synthesis of Two Dimensional (2D) V 2 O 5 Nanosheets Film towards Photodetectors.

Most of the studies focused on V 2 O 5 have been devoted to obtaining specific morphology and microstructure for its intended applications. Two dimensional (2D) V 2 O 5 has the most valuable structure because of its unique planar configuration that can offer more active sites. In this study, a bottom-up and low-cost method that is hydrothermal combined with spin-coating and subsequent annealing was developed to prepare 2D V 2 O 5 nanosheets film on quartz substrate. First, VOOH nanosheets were prepared by the hydrothermal method using V 2 O 5 powders and EG as raw materials. Further, V 2 O 5 nanosheets with an average lateral size over 500 nm and thickness less than 10 nm can be prepared from the parent VOOH nanosheets by annealing at 350 °C for 15 min in air. The prepared V 2 O 5 nanosheets film was assembled of multiple nanosheets. The structural, morphological, microstructural and optical properties of the films were respective investigated by XRD, SEM, TEM and UV-Vis. The photodetector based on V 2 O 5 nanosheets film shows good photoresponse with a response time of 2.4 s and a recovery time of 4.7 s.