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为了明确团聚现象及表面性质对Zn S纳米材料发光性质的影响,采用Si O2对Zn S材料进行了表面修饰,并对Zn S及Zn S/Si O2复合材料的光学性质进行对比研究。采用吸收光谱分析了包覆前后光吸收性质的差异,发现Si O2包覆后Zn S纳米材料的带边由333 nm红移至360 nm。为了研究Zn S纳米材料与Zn S/Si O2纳米复合材料的光发射性质,分别对含纳米材料的水溶液样品及粉末样品的发光光谱进行了采集。对比研究的结果表明,Si O2包覆后Zn S纳米材料在蓝紫光区的发光得到了明显增强。以氙灯作为激发光源所获得荧光光谱显示Zn S/Si O2粉末样品发光的积分强度增大为原来的17.5倍,但相同条件下针对溶液样品的测试结果显示其发光强度只增大了1.1倍,这种增强可用Si O2的存在抑制了Zn S纳米粒子间的团聚来解释,且这一推断由325 nm紫外激光激发下获得的光致发光数据进行了验证。
In order to clarify the effect of agglomeration and the surface properties on the luminescent properties of ZnS nanostructures, the surface modification of ZnS materials was performed using Si O2, and the optical properties of ZnS and Zn S / Si O2 composites were compared. Absorption spectra were used to analyze the difference of light absorption before and after coating. It was found that the band edge of Zn S nano-material was red-shifted from 333 nm to 360 nm after Si O2 coating. In order to study the light emission properties of Zn S nanostructures and Zn S / Si O2 nanocomposites, the luminescence spectra of aqueous nanomaterial-containing samples and powder samples were collected respectively. The results of comparative studies show that the luminescence of ZnS nanomaterials in the blue-violet region after Si O2 coating has been significantly enhanced. Fluorescence spectra obtained with xenon lamp as an excitation light source showed that the integrated intensity of Zn S / Si O2 powder samples increased 17.5 times that of the original samples, but the test results for solution samples under the same conditions showed that the luminescence intensities increased only 1.1 times, This enhancement can be explained by the presence of Si O2 inhibiting the agglomeration of Zn S nanoparticles, and this extrapolation is validated by the photoluminescence data obtained with 325 nm UV laser excitation.