Department of Physics, Faculty of Science, Vali-E-Asr University, Rafsanjan, Iran.
Department of Biology, Faculty of Basic Sciences, Shahrekord University, Shahrekord, Iran.
J Fluoresc. 2022 Nov;32(6):2129-2137. doi: 10.1007/s10895-022-03013-1. Epub 2022 Aug 10.
In the present work, CdTe/ZnS high luminescence quantum dots (QDs) were synthesized by a facile, fast, one-pot, and room temperature photochemical method. Synthesized QDs were characterized by different structural and optical analyses such as X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDS), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Fourier transform-infrared spectroscopy (FT-IR), Raman, photoluminescence (PL) and UV-visible (UV-vis) spectroscopies. The results confirmed the successful growth of the ZnS shell and formation of CdTe/ZnS core/shell structure. CdTe/ZnS prepared QDs indicated a PL quantum yield of about 51%. These high luminescence QDs were used for detection of Hg ions in aqueous media, as catalyst for photodegradation of different organic dyes, and as antibacterial material for the inhibition of bacterial growth. PL intensity of the CdTe/ZnS QDs was completely quenched after addition of 1 m molar Hgin to the media. Photocatalyst activity of CdTe/ZnS QDs was studied by rhodamine b, methylene blue, and methylene orange as organic dyes under both the sun and UV illuminations, and results showed that CdTe/ZnS QDs had the best photocatalyst activity for methylene blue degradation under UV irradiation and radical scavenger results indicated that electrons have a main role in photodegradation of methylene blue dye by CdTe/ZnS QDs under UV illumination. Antibacterial effects of CdTe/ZnS QDs evaluated by Minimum Inhibitory Concentration (MIC), and Minimum Bactericidal Concentration (MBC) methods against two strains of bacteria. The results of the antibacterial test showed that CdTe/ZnS could inhibit bacterial growth in Bacillus cereus (Gram-positive) and Escherichia coli (Gram-negative G) bacteria.
在本工作中，通过简便、快速、一锅法和室温光化学法合成了具有高光致发光量子产率的 CdTe/ZnS 高发光量子点（QDs）。合成的 QDs 通过 X 射线衍射（XRD）、能谱（EDS）、场发射扫描电子显微镜（FESEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT-IR）、拉曼、光致发光（PL）和紫外可见（UV-vis）光谱等不同的结构和光学分析进行了表征。结果证实了 ZnS 壳的成功生长和 CdTe/ZnS 核/壳结构的形成。CdTe/ZnS 制备的 QDs 表现出约 51%的 PL 量子产率。这些高发光 QDs 用于检测水介质中的 Hg 离子，用作不同有机染料的光降解催化剂，以及用作抑制细菌生长的抗菌材料。将 1 m 摩尔的 Hgin 加入到介质中后，CdTe/ZnS QDs 的 PL 强度完全猝灭。在阳光和 UV 光照下，以罗丹明 B、亚甲基蓝和橙黄 G 作为有机染料研究了 CdTe/ZnS QDs 的光催化剂活性，结果表明 CdTe/ZnS QDs 在 UV 光照下对亚甲基蓝降解具有最佳的光催化剂活性，自由基清除剂结果表明电子在 CdTe/ZnS QDs 光降解亚甲基蓝染料中起主要作用。通过最低抑菌浓度（MIC）和最低杀菌浓度（MBC）方法评估 CdTe/ZnS QDs 对两种细菌的抗菌效果。抗菌试验结果表明，CdTe/ZnS 可以抑制蜡状芽孢杆菌（革兰氏阳性）和大肠杆菌（革兰氏阴性 G）细菌的生长。
