Henan Normal University

About: Henan Normal University is a education organization based out in Xinxiang, China. It is known for research contribution in the topics: Catalysis & Ionic liquid. The organization has 10863 authors who have published 11077 publications receiving 166773 citations.

Enhanced rectification, transport property and photocurrent generation of multilayer ReSe2/MoS2 p–n heterojunctions

Abstract: Van der Waals (vdW) heterojunctions are equipped to avert dangling bonds due to weak, inter-layer vdW force, and ensure strong in-plane covalent bonding for two-dimensional layered structures. We fabricated four heterojunctions devices of different layers based on p-type distorted 1T-MX2 ReSe2 and n-type hexagonal MoS2 nanoflakes, and measured their electronic and optoelectronic properties. The device showed a high rectification coefficient of 500 for the diode, a high ON/OFF ratio and higher electron mobility for the field-effect transistor (FET) compared with the individual components, and a high current responsivity (R λ ) and external quantum efficiency (EQE) of 6.75 A/W and 1,266%, respectively, for the photodetector.

Preparation, characterization and photocatalytic properties of REFeO3 (RE = Sm, Eu, Gd)

Abstract: Nanometer materials of rare earth mixed oxides REFeO 3 (RE = Sm, Eu, Gd) with the structure of perovskite-type were synthesized by the sol–gel method in the citric acid system. The structure and crystal phase of the powders were characterized using an X-ray diffractometer. The shape and size were analyzed using a JEM-100X transmission electron microscopy. The perovskite-type oxides were spherical with the mean grain size of 28, 20 and 21 nm, respectively. Their crystal structures showed a certain amount of lattice distortion due to the decrease of grain size and the increase of surface area. The photocatalytic activities of these three materials were studied for the degradation of various water-soluble dyes. The effect of catalyst loading on the photocatalytic activity was also investigated. SmFeO 3 , EuFeO 3 , GdFeO 3 exhibited high photocatalytic activities and the increase in catalyst loading could improve their photocatalytic activities.

Selective detection of HCHO gas using mixed oxides of ZnO/ZnSnO3

Abstract: Mixed oxides of ZnO/ZnSnO3 doped with Au element were prepared by a hydrothermal process. The crystal structure, composition and ceramic microstructure of the powders obtained were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The results show that the product is the mixture of ZnO/ZnSnO3; its particle size is about 500 nm with good dispersivity in shape. The sensitivity, selectivity, response and recovery properties of the ZnO/ZnSnO3-based sensors were investigated by mixing a target gas in air. It is found that the sensors have remarkable sensitivity to HCHO vapor and satisfactory selectivity to other gases.