【作者】 岳利青；

【导师】 周禾丰；

【作者基本信息】 太原理工大学 ， 材料加工， 2005， 硕士

【摘要】 纳米材料科学是一门涉及多学科领域的科学,纳米颗粒由于尺寸小而能够产生量子尺寸效应、表面效应、介电限域效应和宏观量子隧道效应等。它们的光学性质和与其相应的块体材料相比有很大的变化,近年来半导体掺杂的纳米材料的光学性质引起了人们的重视。本文对经过表面修饰的掺杂半导体纳米材料的光学性质进行了研究,重点是研究过渡族金属Mn、Cu离子掺杂的ZnS基纳米材料的光学性质,并得出了以下结果: （1） 采用溶胶-凝胶法制备了发绿光的ZnS:Cu纳米荧光粉,并利用Na₂S₂O₃对纳米颗粒表面进行了修饰,同时引入多聚磷酸钠作为保护剂,进一步增强了纳米颗粒在溶胶中的稳定性和分散性,从而有效地控制了纳米颗粒的粒径;探讨了Cu离子的掺杂含量、Na₂S₂O₃溶液的浓度、溶液pH值以及Na₅P₃O₁₀溶液的浓度等对所得产物的影响,找出了最佳工艺配更多还原

【Abstract】 Nanoscience has drawn considerable interest and has been investigated all over the world. The nanoparticles have different properties compared with its bulk such as quantum size effect, surface effect, the dielectric confinement effects, and etc. The intrinsic optical properties of nanoparticles have been thoroughly studied and the optical properties of semiconductor nanoparticles doped with activator elements such as ZnS:Mn2+ which was first prepared in 1993 led to a new stage of investigation of optical properties of nanoparticles. In this thesis, we studied opticalproperties of ZnS nanocrystallites doped with M ( Cu2+, Cu+ or Mn2+). The new results are as follows.(1) By sol-gel method, green-light emitting ZnS:Cu nanoparticles surface-capped by Na2S2O3 were obtained. During the synthesis process, Na5P3O10 were used as protecting reagent in order to increase the stability and dispersivity of nanoparticles in organic collosol. We also studied the factors that affect the synthesis such as doping concentration, Na2S2O3 dosage, pH and so on, and found the optimal technical reaction conditions. The photoluminescence (PL) spectra, XRD spectra and UV-vis spectra were measured to characterize their optical properties and crystal structures.(2) By sol-gel method, M ( Cu2+ and Mn2+ ) were directly doped into ZnS and two kinds of ZnS matrix white-light emitting nanoparticles were obtained. One kind is only doped with Mn2+ and the other is doped with both of Cu2+ and Mn2+. The ZnS:M nanoparticles were surface-capped by methacrylic acid. The photoluminescence (PL) spectra, XRD spectra and UV-vis spectrawere measured to characterize their optical properties and crystal structures.(3) The average diameter of the prepared ZnS:Mn particles is 7nm. Its photoluminescence (PL) spectrum exhibits two emission peaks under irradiation, one is at 480nm with a blue-light emitting originating from the ZnS matrix and the other is at 590 nm with a yellow-light emitting originating from the doping Mn2+. In general, the two violent emittings come into being a white-light emitting.(4) The average diameter of the prepared ZnS:Mn,Cu particles is also 7nm. Its photoluminescence (PL) spectrum also exhibits two emission peaks under irradiation, one is at 480nm with a blue-light emitting and the other is at 600 nm with a yellow-light emitting. In general, the two violent emittings come into being a white-light emitting.更多还原