Dissertation
Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

The Study of Opto-electronic Property of Nanoscale Inorganic Materials & Application

Author PanLiuHua
Tutor WeiAng
School Nanjing University of Posts and Telecommunications
Course Information materials
Keywords Nanomaterials Zinc oxide Dielectrophoretic Neodymium-doped fluoride phosphate strontium Optoelectronic properties
CLC TB383.1
Type Master's thesis
Year 2011
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In recent years, the photoelectric properties of nano-materials with a surface effect and the small size effect much attention to that used in microelectronics , high-energy laser , bio- labels , as well as a large area display . From the low-temperature , low-cost , easy to control , preparation of environment-friendly technologies starting synthesize inorganic nanomaterials , to study the electrical properties of the nano - metal oxide and nano optical properties of rare-earth - doped compounds , and by scanning electron microscopy ( SEM ) Transmission electron microscopy (TEM), fluorescence spectroscopy ( PL ) , X - ray diffraction (XRD), infrared spectroscopy (FTIR), Raman spectroscopy (Raman) and Keithley 4200 synthetic nanomaterials structure , photoelectric performance testing and characterization . The main innovation of the full text of the results are as follows : 1 hydrothermal method successfully grown a uniform morphology , a diameter of about 500 nm, and a length of more than 20 microns of ZnO rods , characterization results showed that ZnO nanorods have a small amount of lattice defects , such as oxygen vacancy given ZnO growth mechanism ; using dielectrophoresis prepared ZnO nano components . Through the ZnO nanorods filter , A1 electrode preparation and dielectrophoresis process set up to determine the number of ZnO nanorods prepared ZnO-based components , the test that has good electrical properties of ZnO-based components . Finally , given the principle of dielectrophoresis ; to 3 pH cycling prepared a good dispersion , at room temperature , ca 60nnm width 20nm Neodymium-doped strontium fluorophosphate nanomaterials . During the experiment , pH changes the amplitude , from each pH stage of the reaction time and pH of the number of cycles for the Preparation of the strontium fluorophosphate very crucial role . Investigated strontium material neodymium-doped fluoride crystal morphology, structure and optical properties of annealing temperature . The results show that with increasing annealing temperature , the sample fluorescence performance is greatly improved , and the fluorescence lifetime of the sample after annealing at 700 ℃ up to 330μs Sr5 ( PO4 ) 3F : even higher fluorescence lifetime of Nd3 crystal , these are prepared as strontium fluorophosphate nano fluorescent material is a good host material . Finally, analysis of the mechanism of pH cycling method of preparation ;

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