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Influence of the Particle Size on the Optical Properties of CdSe Nanoparticles

机译：粒径对CdSe纳米粒子光学性能的影响

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Monodispersed CdSe nanoparticles with sufficient luminescence intensity have been prepared by chemicalmethod in the presence of mercaptoacetic acid as a capping agent. Cadmium acetate (Cd(Ac)2.2H2O) and sodium selenosulfate(Na2SeSO3) are used as a cadmium and selenium sources respectively. The resulting nanocrystallites have beencharacterized by X-Ray Diffraction, UV-Vis absorption spectra and photoluminescence (PL) spectroscopy. The particlesize was estimated from broadening of XRD peak using Scherrer’s formula and also from effective band gap by absorptionpeak using effective mass approximation model. The size obtained from XRD and absorption peaks are in agreementwith each other. It is observed that the samples consist of separated, well-defined spherical particles and show a small sizedistribution as well as a characteristic blue shift due to quantum confinement in their optical absorption as well as PLspectra. It is found that the size of CdSe nanoparticles decreases, as the concentration of capping agent is increased. Theintensity of PL peak increases and the peak shift towards blue region as the particle size is reduced. The sharp PL spectraalso indicate that the nanoparticles are monodispersed.
机译：在巯基乙酸作为封端剂的情况下，通过化学方法制备了具有足够发光强度的单分散CdSe纳米颗粒。乙酸镉（Cd（Ac）2.2H2O）和硒酸钠（Na2SeSO3）分别用作镉和硒源。所得的纳米晶体已经通过X射线衍射，UV-Vis吸收光谱和光致发光（PL）光谱表征。使用谢勒公式通过XRD峰的展宽以及有效质量近似模型通过吸收峰的有效带隙来估算颗粒大小。从XRD获得的尺寸和吸收峰彼此一致。观察到样品由分离的，定义明确的球形颗粒组成，并且由于其光吸收和PLspectra中的量子限制而显示出小的尺寸分布以及特征性蓝移。发现随着封端剂浓度的增加，CdSe纳米粒子的尺寸减小。随着粒径的减小，PL峰的强度增加，并且峰向蓝色区域移动。清晰的PL光谱还表明纳米颗粒是单分散的。

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