Solution-Based Synthesis, Doping, And Opticle Property Of One Dimensionality ZnSe Nanomaterials

Based on the development of the solution methodology to synthesize 1D II-VI semiconductor nanomaterials nowadays, we have synthesized a series of ZnSe-based 1D semiconductor nanostructures. Considering the significance of ZnSe in the area of materials science, we chose it as the model system in this dissertation. The main results can be summarized as follows:1. Mn-substituted 1-D [Zn1-xMnxSe](DETA)o.5(DETA= Diethylenetriamine, x= 0-0.3) inorganic-organic hybrid nanobelts can be synthesized by a simple solvothermal reaction in a mixed solvent media. The Mn content dependence of PL intensities are studied in detail. Luminescence of doped inorganic-organic hybrid semiconducting nanostructures are also investigated systematically based on electron paramagnetic resonance, temperature-and pressure-dependent photoluminescence. The results demonstrate that the intensity of Mn2+-related orange luminescence at 585 nm is greatly enhanced as the temperature decreased to 30 K. Under pressure, a large red shift of Mn2+-related orange luminescence was observed and intensity was greatly decreased. Being the kink point 2.54 GPa, the PL energy varies linearly with the pressure separately and presents two pressure coefficient. The pressure coefficient at high pressure should be due to a phase transition trend from direct to indirect gap semiconductors, while the one at low pressure is deduced to come of compression effect of diethylenetriamine molecules.2. ZnSe nanobelts, nanotubes and Mn-substituted ZnSe nanotubes can be synthesized using [ZnSe](DETA)o.5 one-dimensional nanobelts as templates when selecting proper avenues to extract amine with 1-Octadecene (ODE) and ethylene glycol (EG) respectVIely. The results demonstrate that the forms of nanobelts are the result of thermal effect, while nanotubes come from modified Kirkendall effect coupled with the oriented attachment mechanism.3. Ultralong ZnSe nanowires can be synthesized by a mild solvothermal reaction using a mixed binary solvent made of cyclohexylamine_CHA and deionized water (DIW). The results demonstrated that the volume ratio of CHA and DIW has a significant influence on the shape of the product. In photoluminescence (PL) spectra near band edge (NBE) of the nanowires centered at 375nm (3.3eV). Compared with band gap of bulk ZnSe crystal (2.7 eV), a blue-shift occurred due to quantum size effect.