Preparation Of Cu_xY(Y=O/Se) Films Via A Facile Solution Route And Their Photocatalytic Activities,electrochemical Sensing Properties,antibacterial Activities

Copper oxide/copper selenide nanomaterials have been extensively studied due to their many potential applications in many fields,such as catalysts,sensors,lithium ion batteries and supercapacitors.In this paper,hexagonal Cu₂Se nanoplate array,flower-like CuO and flower-like Cu_2-xSe films were successfully prepared by a simple solution route.The films were characterized by SEM,TEM,XRD,XPS and UV-Vis absorption spectra.The formation mechanism of the products was studied.The photodegradation activities to organic dye solutions of methyl blue?MB?,methyl orange?MO?and rhodamine B?RhB?,the electrochemical sensing properties and antibacterial activities to both staphylococcus aureus?S.aureus?and Escherichia coli?E.coli?were studied.The details are as follows:Hexagonal Cu₂Se:The Cu₂Se hexagonal nanoplate array film was prepared on a copper foil substrate by a simple solution method at room temperature.The morphology and structure of the synthesized samples were characterized.The formation mechanism and photodegradation activity on MB solution were explored based on a series of the control experiments.The results showed that the Cu₂Se film exhibits high photocatalytic activity to MB with the assistance of H₂O₂.Flower-like CuO:Pure monoclinic CuO of flower-like film with nanosheets hierarchical structure has been successfully prepared via a facile one-step solution method at room temperature.The formation mechanism,the photodegradation activity on MB solution and the electrochemical sensing properties of an AA solution were studied.The results showed that the CuO film could decolorize the MB solution with high concentration?100mg/L?in 90 minutes,which indicated the excellent photocatalytic activity of flower-like film.For the first time,the flower-like CuO film was used as the working electrode directly to detect AA,showing high sensitivity,good stability and selectivity to AA.Flower-like Cu_2-xSe:Three-dimensional?3D?flower-like Cu_2-xSe film with hexagonal nanosheet hierarchical structure has been prepared for the first time from a 3D flower-like CuO film precursor through a facile sacrificing template method at room temperature.The product was characterized and its formation mechanism was explored based on series of control experiments,combining with crystal structure analysis.The photodegradation activities of the Cu_2-xSe film on three dye solutions were studied.Particularly,for the first time its antibacterial activities were explored.The results show that the 3D flower-like Cu_2-xSe is assembled by numerous hexagonal nanosheets with thicknesses of about 50 nm.The flower-like Cu_2-x-x Se displays excellent antibacterial activities to both S.aureus and E.coli.For the first time,the concentration of Cu?II?ion in antibacterial system was measured accurately by absorbance method,the experimental results confirm that the antibacterial rate depends on the Cu?II?ions concentration which is closely related with the Cu_2-x-x Se quantity and the incubation time of bacterial.