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以ZnAc2·2H2O为原料,在乙醇中通过70℃回流4h,得到ZnO前驱物,与LiOH·H2O反应,制备出ZnO.采用巯基乙酸(mercaptoacetic acid,MAA)对所合成的ZnO进行表面修饰,修饰后的产物经SEM和XRD表征,证明获得了物相单一、近似球状、粒径为4.6nm的ZnO量子点.借助紫外-可见和荧光分析,研究了MAA对该量子点的修饰效果,探讨了设置条件下ZnO的发光机理和性质.发现该实验体系之所以产生荧光表面缺陷发射峰消失和激子发射峰明显增加的光学现象,是因为MAA有效地覆盖了ZnO的表面缺陷,并稳定包裹住ZnO粒子.同时还研究了MAA加量、温度、电解质对修饰产物发光性能的影响,发现经MAA修饰后的ZnO量子点具有较强的荧光发光性能、良好的长期陈放稳定性,以及一定的抗电解质影响能力.研究结果对ZnO量子点应用于生物分析具有重要参考价值.
The ZnO precursor was obtained by reaction of ZnAc2 · 2H2O in ethanol with refluxing at 70 ℃ for 4h, and reacted with LiOH · H2O to prepare ZnO.The surface of the synthesized ZnO was modified by mercaptoacetic acid (MAA) The obtained product was characterized by SEM and XRD, and the ZnO quantum dots with a single phase, nearly spherical shape and a particle size of 4.6 nm were obtained.The modification effect of MAA on the quantum dots was studied by UV-Visible and fluorescence analysis The mechanism and nature of the ZnO emission under the set conditions were investigated.The optical phenomena that the emission peak of the fluorescence surface defect disappears and the exciton emission peak is obviously increased are found in the experimental system because MAA effectively covers the surface defects of ZnO and stabilizes the encapsulation ZnO particles.At the same time, the effects of MAA dosage, temperature and electrolyte on the luminescent properties of the modified products were also studied. It was found that the quantum dots modified by MAA have strong fluorescence luminescence properties, good long-term stability and some anti- Electrolyte influence ability.The research results have important reference value for the application of ZnO quantum dots in biological analysis.