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In this study, controlled growth of InN nanorods on Si (111 ) substrates is realized by a self-made haliide chemical vapor deposition (HCVD) device. The effects of temperature in the source region of InCI3, NH3 flow rate and N2 carrier gas flow rate on the growth of InN nanorods are systematically studied. The structure, morphology and elemental composition of InN nanorods are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results show that the nucleation rate and growth rate of InN nanorods can be improved with the increase of temperature in the source region of InCl3. The NH3 flow rate has an important influence on the crystal quality of InN nanorods. The appropriate NH3 flow rate can meet the V/III ratio required for In source growth, and improve the quality of nanorods. When the NH3 flow rate is too high, the formation of In vacancy defects make the crystal quality worse. N2 carrier gas flow can affect the concentration and bias of In and N sources, which can effectively regulate the diameter and growth rate of InN nanorods. The controllable growth of InN nanorods is realized, which lays a foundation for the development of high performance InN nanorod devices. [ABSTRACT FROM AUTHOR]

In this article, CuBi2O4, nanorods are prepared by hydrothermal method, and then Ce(OH)3 layer is deposited on the surface by wet chemical method and calcined to prepare CeO2 CuBi2O4 heterojunction photocatalyst. The CeO2 CuBi2O4 composite photocatalyst is characterized by X-ray diffraction (XRD ), scanning electron microscopy (SEM), X-ray p ho t0electron spectroscopy ( XPS), UV-Vis absorption spectroscopy (UV-Vis) and Mott-Schottky plot (M-S). Rhoda mine R(RhB) is used as the target pollutant to study the effect of CeO2 doping on the photocatalytic performance of CeO2 CuBi2O4 heterojunction under simulated sunlight . The results show that when 10% CeO2, is added into the composite, the degradation efficiency of RhB reaches the maximum (93.1%, 60 min), which is 30.6% higher than that of pure CuBi2O4 (71.3%, 60 min). Through free radical capture experiments, it is deter mined that the active substances that play a major role in the photocatalysis experiment are • O2- and h+. Combined with the analysis of electron band structure, it is considered that the effective separation of photogenerated electron hole- pairs under the built-in electric field of p-n heterojunction is the main reason for the improvement of photodegradation efficiency. This study provides an application of CeO2CuBi2O4-based heterojunction in photocatalysis, which is of great significance to meet the growing environmental needs in the future. [ABSTRACT FROM AUTHOR]

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