【摘要】 水热合成法制备的高度有序多孔ZrO2具有规则六角排列、均匀纳米孔洞(约1 8nm),并且其蓝、(近)紫外光发射强度比纳米微晶材料高2个数量级。本文研究了纳米介孔ZrO2这种不同于常规体材料与纳米晶材料的特殊发光性质。通过化学方法对纳米介孔ZrO2进行表面修饰后,能进一步提高其光发射强度约3倍。通过这些发光性质的研究,以期增进对ZrO2发光机理的认识。更多还原

【Abstract】 ZrO2,especially in nano scale, with interesting properties in mechanics, thermal, optoelectronics, has been widely used in ceramic, sensor, hightemperature solid cell, fireproof and wearable materials, etc. With the development of methods for mesoporous materials, mesostructured zirconia has attracted great interest in catalysis, selforganized materials and biomedicine. In this paper, luminescence properties of highly ordered porous ZrO2, synthesized by surfactantassisted route and postsynthetic treatment of surfacemodification,were studied and the emission intensity of ZrO2 can be improved after the modification.An aqueous solution of analytically pure ZrSO4·4H2O was dropped into a pure C16TMABr solution under certain temperature and molar ratio during continuous stirring. After stirred for 3h, the mixtures were loaded in PTFElined stainless steel autoclaves and heated from 90℃ to 120℃ for 24h. The precipitated products were filtered, washed and dried at 100℃. The dried precipitate was afterwards treated with phosphoric acid solution and then calcined in flowing air at 500℃ for 6h to remove the surfactant. And to modify the surface, some sample were successively dipped into the solution of Zn(Ac)2 and (NH4)2CO3 for about 10h, step by step, and filtered, washed and dried at 100℃.The studies indicated ZrO2 has highly ordered hexagonal pores of about 18nm and has strong blue and ultraviolet light emission whose intensity is 100 times higher than that of the bulk samples.Therefore,the luminescence intensity of sufacemodified sample is 3 times higher. Under the excitation by 240, 280, 330nm, the emission with the same spectral structure of four emission peaks at 380,410,450,490nm appears,so one can conclude these peaks are related to the same emission center, while the emission (λem=330nm) excited by 205nm is from a different center.更多还原