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研究沉淀法合成Cd掺杂ZnO纳米颗粒的结构和光学特征。X射线衍射分析表明,掺杂Cd的置换不影响ZnO的基本铅锌矿型结构。随着Cd掺杂增加至4%,平均晶粒尺寸、晶格参数和单胞体积增加。采用紫外可见吸收光谱和Tauc法测定样品的能隙,能隙随Cd含量增加而减小。傅里叶变换红外光谱通过485～563 cm~(-1)峰确定Cd掺杂物。光致发光谱的强度增加也确定了Cd掺杂物。437 cm~(-1)处的宽拉曼峰表明,5%的Cd掺杂弱化了ZnO的铅锌矿型结构。场发射扫描电镜分析也证实了纳米尺寸粒子的存在,并证明了掺杂5%Cd时微结构从纳米颗粒转变成花状微结构。
The structure and optical properties of Cd doped ZnO nanoparticles synthesized by precipitation method were studied. X-ray diffraction analysis shows that Cd doping does not affect the basic Pb-Zn structure of ZnO. As Cd doping increases to 4%, the average grain size, lattice parameters, and unit cell volume increase. The energy gap of the samples was determined by UV-vis absorption spectroscopy and Tauc method. The energy gap decreased with the increase of Cd content. Fourier transform infrared spectroscopy to determine Cd dopants by 485 ~ 563 cm ~ (-1) peak. The increase in the intensity of the photoluminescence spectrum also determined the Cd dopant. The wide Raman peak at 437 cm -1 indicates that 5% Cd doping attenuates the lead-zinc-type structure of ZnO. The field emission scanning electron microscopy analysis also confirmed the existence of nano-sized particles and demonstrated that the micro-structure transformed from nano-particles into flower-like microstructure when doped with 5% Cd.