Ni掺杂ZnO晶体的制备及红外光谱特性

Hydrothermal preparation and IR spectroscopic of ZnO crystal with Ni-doped

采用水热法制备了不同比例Ni掺杂ZnO晶体。XRD结果表明,Ni掺杂浓度较低时,生成置换型氧化锌镍固溶体,当Ni掺杂浓度增加到5%时,Ni2＋过饱和,析出部分立方NiO。FT-IR结果显示：当水热温度达到160℃时,粒子运动速率越快,晶格空隙越开放,Ni2＋替代Zn2＋形成固溶体的数目增多,掺杂ZnO在906cm-1附近出现了一个新的吸收带,并且随着掺杂浓度的增加,吸收带变强变宽;提高前驱物的pH值,实际进入ZnO晶格Ni2＋浓度越高,造成的晶格缺陷越多,从而使吸收带出现了蓝移,表现出良好的红外吸收特性。

Ni-doped ZnO crystals were synthesized by the hydrothermal method.XRD indicated that,the solid solution Ni2＋/Zn2＋O was synthesized when Ni doping content was 1%,2%,NiO appeared when the Ni doping concentrations was up to 5mol%.FT-IR spectra showed that when the hydrothermal temperatures reached 160℃,there were more open voids in the lattice,and more Ni2＋ replaced Zn2＋ in solid solution,a new absorption band appeared near 910cm-1,and the absorption band became stronger and wider with the increase of doping content;With enhanced of pH value,the more Ni2＋ was actually getting into the ZnO lattice,the more defects occurred in the lattice,then a blue shift of absorption band was observed.And sample had a better infrared absorption in both mid and far-infrared.