Study On Preparation And Properties Of Inorganic Semiconductor Composites

As the drying of oil, coal and other fossil, human is facing serious energy crisis and environment problems now. Therefore, preparing new multifunctional materials to solve the environment problems is very necessary now. As we know y-CuI has attracted much attention due to its many particular features such as low electrical resistivity, low-cost, anomalous diamagnetism behavior and potential applications in solid-state solar cells, catalysis for the synthesis of organic compounds, and heavy metal ion adsorbent. However, the direct band gap of y-CuI is too large. So improving the light response of CuI and broadening the application field of Cul are very important. The pyramid-shaped CuI/PANI nanocomposites have been synthesized by one-step hydrothermal method without any additional oxidants, which show excellent photocatalysis property. We also study the microwave absorption property of Fe3O4/CuI/PANI nanocomposites, which was prepared under the condition of room-temperature. At the same time, Fe2O3/C nanocomposites synthesized in spinach juice perform well electrochemical property. The main contents are summarized as follows:1. The pyramid-shaped CuI/PANI nanocomposites have been prepared by hydrothermal method for only one step. The properties and morphology of the nanocomposites can be adjusted by changing the molar ratios of Cu2+/aniline. The synergistic effect between PANI and Cul makes the nanocomposites show excellent photocatalytic property such that the degradation efficiency of RhB (10-5M) is nearly100%at an irradiation time of50mins under visible light. The nanocomposites also perform good hydrophobic and lipophilic properties, which can be used to remove the engine oil from the water surface clearly.2. Novel porous Fe3O4/CuI/PANI nanosheets were successfully synthesized by a facile in situ redox reaction at room temperature. Remarkably, the morphology and properties of the nanocomposites can be adjusted by changing the molar ratios of Cu2+/aniline. The porous nanocomposite sheets with the molar ratios of Cu2+/aniline at1:1exhibit excellent microwave absorption property, which display strong reflection. The nanocomposites with a coating layer thickness of2.8mm present a maximum absorption of-35.3dB at13.28GHz, show a bandwidth of3.2GHz (from frequency of12.1-15.3GHz) corresponding to reflection loss at-10dB. The Fe3O4/CuI/PANI nanocomposites also show excellent hydrophobic property, which may result in stability enhancement of the porous Fe3O4/CuI/PANI nanosheets.3. The Fe3O3/C nanocomposites were synthesized by just using biomolecules in spinach juice as template via a green facile chemical approach in this paper. The relationship between Lithiation/delithiation performance and experimental conditions such as hydrothermal temperature, concentration of Fe3+and spinach juice were explored. The product of b-0.4M performs best Charge-discharge performance, between0.01-3.0V versus Li, the initial specific discharge capacity is up to1405mAh/g, and the discharge capacity of the50th cycle keeps at422mAh/g. Nyquist spectra show that the transfer resistance of b-0.4M is only170Ω.