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。
ZrO2,especially in nano scale, with interesting properties in mechanics, thermal, optoelectronics, has been widely used in ceramic, sensor, hightemperature solid cell, fireproof and wearable materials, etc. With the development of methods for mesoporous materials, mesostructured zirconia has attracted great interest in catalysis, selforganized materials and biomedicine. In this paper, luminescence properties of highly ordered porous ZrO2, synthesized by surfactantassisted route and postsynthetic treatment of surfacemodification,were studied and the emission intensity of ZrO2 can be improved after the modification.An aqueous solution of analytically pure ZrSO4·4H2O was dropped into a pure C16TMABr solution under certain temperature and molar ratio during continuous stirring. After stirred for 3h, the mixtures were loaded in PTFElined 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 (NH4)2CO3 for about 10h, step by step, and filtered, washed and dried at 100℃.The studies indicated ZrO2 has highly ordered hexagonal pores of about 18nm 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 sufacemodified 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 (λem=330nm) excited by 205nm is from a different center.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2003年第4期407-411,共5页
Chinese Journal of Luminescence
基金
国家自然科学基金资助项目(19974025)
