苹果酸辅助法水热合成ZnS∶Mn的相态及其远红外吸收光谱的研究  

The phase state and Far-IR spectroscopy study of ZnS:Mn synthesized by malic acid-assisted hydrothermal method

作　　者：程毛杰[1] 毕红[1] 

机构地区：[1]安徽大学化学化工学院,合肥230039

出　　处：《中国科技论文在线》2009年第6期459-464,共6页

基　　金：国家自然科学基金(20401001;50772001);安徽省优秀青年科技基金(08040106822)

摘　　要：采用苹果酸辅助法水热合成了ZnS∶Mn。随着络合剂——苹果酸的加入量从0g,0.2g,1g增大到2g,苹果酸与锌离子和锰离子形成的络合物有效控制了金属离子的释放速度,调节了ZnS∶Mn晶体的生长速度,因此,ZnS∶Mn的形貌规整度逐渐提高,其晶相也从混合相(立方相和六方相)转变为纯立方相。使用远红外光谱(Far-IR)和拉曼光谱(Raman spectra)对ZnS∶Mn的晶格振动进行了研究,结果表明:纯ZnS的远红外光谱在350cm-1～200cm-1范围内有1个宽吸收峰,而ZnS∶Mn在此范围内的吸收峰发生了裂分,裂分为279cm-1和315cm-1处的2个峰,并且位于315cm-1处的吸收峰比279cm-1处吸收峰吸收强度大,这可能是因为晶格态的Mn2+和点缺陷态的Mn2+均使ZnS∶Mn中TO振动模式的振动频率向高频方向移动所致。另外,随着水热合成中苹果酸加入量的增加,所得ZnS∶Mn样品的结晶性提高,晶体缺陷减少,使得位于Far-IR谱图上414cm-1处的吸收峰弱化。ZnS ： Mn microcrystals were synthesized by a malic acid-assisted hydrothermal method in this paper. The amount of the complexing agent -malic acid played a key role in the crystal nucleation and growth. The phase of the ZnS ： Mn was transited from the mixed to the cubic one as the amount of malic acid increased from 0 g to 2 g, accompanied with the morphology becoming more regular. The complexes of malic acid with Zn^2＋ and Mn^2＋ ions controlled the releasing rate of metal ions in the reaction system effectively and regulated the growth rate of ZnS：Mn microcrystals. The lattice vibrations of the ZnS ： Mn were studied by using far infrared （Far-IR） spectroscopy and Raman spectroscopy. The results revealed that one absorption peak of ZnS in the range of 350-200 cm^-1 split into two peaks for ZnS ： Mn, which locating at 279 cm^-1 and 315 cm^-1, respectively. This split of the peak was probably because the doped Mn^2＋ ions both incorporated into the lattice and located in the point defects sites, made the absorption intensity of TO vibration mode decreased at 279 cm^-1 and enhanced at 315 cm^-1. In addition, the absorption peak at 414 cm^-1 in Far-IR speclra became weaker due to the better crystallinity and thus the reduced crystallographic defects with increasing amount of malic acid during the synthesis.

关 键 词：无机合成 ZnS∶Mn 苹果酸 相变 远红外 

分 类 号：O614.241[理学—无机化学]