一维Sm_2O_3纳米晶的可控合成及其光学性能研究

Controllable Synthesis and Optical Properties of One-dimensional Sm_2O_3 Nanocrystalline

以有机碱二乙烯三胺(EDTA)为碱源,Sm(NO3)3·6H2O为钐源,在不同模板剂辅助条件下采用水热-热处理相结合的方法进行Sm2O3纳米晶的可控合成。利用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)和Lambda 950分光光度计分别对产物的物相、形貌和光学性能进行表征,并研究了未添加模板剂和分别以六亚甲基四胺(HMTA)、聚乙烯吡咯烷酮(PVP)和十六烷基三甲基溴化铵(CTAB)为模板剂条件下对产物的物相、形貌及光学性能的影响。结果表明:以HMTA为模板剂条件下得到了长条状结构的Sm2O3纳米晶,未添加模板剂和分别以PVP和CTAB为模板剂条件下得到了尺寸可控的棒状结构的Sm2O3纳米晶。不同模板剂会影响产物的微观结构及尺寸,进而对其光学性能产生有较大的影响,其中以HMTA为模板剂时所得长条状结构的Sm2O3纳米晶的禁带宽度较小为4.775 e V。

Sm2O3 nanocrystallines were controllably synthesized with the assist of different templates using Sm（ NO3）3·6H2O and diethylenetriamine as main raw materials under the condition of hydrothermal and thermal treatment. The phase composition,morphologies and optical performances of the as-prepared samples were characterized by XRD（ X-ray diffractometer）,SEM（ scanning electron microscope） and Lambda 950 spectrophotometer. The influences of different templates（ HMTA,PVP and CTAB） on the phase composition,morphologies and optical performances of the products were investigated. The results show that strip-like Sm2O3 nanocrystallines were prepared at HMTA as template,size controlled Sm2O3 nanocrystallines with rod-like microstructure were prepared without template and use PVP or CTAB as template. Different templates have different effects on the structure,size and optical properties of the products. When HMTA was used as template,the energy gap of the strip-like Sm2O3 nanocrystallines is only 4. 775 e V.