School of Chemical Sciences, National Institute of Science Education and Research, Bhubaneswar, HBNI, Bhimpur-Padanpur, Jatni, Khorda-752050, Odisha, India.
Division of Chemical Physics, Chemical Centre, Lund University, Box-124, Se-22100, Lund, Sweden.
Phys Chem Chem Phys. 2020 Jun 10;22(22):12772-12784. doi: 10.1039/d0cp01845g.
The present work has been carried out with the aim to design and develop an efficient light harvesting inorganic-organic hybrid nanoscale material by employing a less toxic, environment friendly inorganic substance and also to understand the mechanism of inter-particle electronic interaction between the inorganic and organic components of the nanomaterial. Specifically, the inorganic-organic hybrid associate has been made by integrating water soluble semiconductor (zinc-silver-indium-sulfide (ZAIS)) QDs and organic J-aggregates of a cyanine dye (S2165). The fabrication of the present nano-hybrid system has been achieved via electrostatically driven self-assembly of organic dyes over ZAIS QDs. The interaction between QD and J-aggregates has been investigated by using steady state and time resolved fluorescence measurements. Zeta potential measurements have also been performed to understand the role of electrostatic interaction and thermodynamic feasibility of the association process. The investigations have revealed that the energy transfer (ET) process between QD and J-aggregates was mediated through a dipole-dipole mechanism. Interestingly, data analysis based on Förster theory has further revealed that the ET from QD to J-aggregates is very high, indicating efficient electronic coupling between the inorganic QD and the organic J-aggregates. Zeta potential measurements and thermodynamic calculations have demonstrated that the interaction between QD and organic dye is electrostatically driven and the association of organic dyes over QDs is thermodynamically feasible. The outcome of the present study is expected to be helpful in designing efficient nanoscale light harvesting devices. Additionally, fluorescence microscopy and toxicity studies on the QDs have also shown their suitability for biological applications.
本工作旨在设计和开发一种高效的光收集无机-有机杂化纳米材料，采用毒性较低、环境友好的无机物质，并了解纳米材料中无机和有机成分之间的粒子间电子相互作用的机制。具体而言，通过整合水溶性半导体（锌-银-铟-硫（ZAIS））量子点和有机菁染料（S2165）的 J-聚集体，制成了无机-有机杂化配合物。通过有机染料在 ZAIS QD 上的静电驱动自组装，实现了本纳米杂化体系的制备。通过稳态和时间分辨荧光测量研究了 QD 和 J-聚集体之间的相互作用。还进行了 Zeta 电位测量，以了解静电相互作用的作用和缔合过程的热力学可行性。研究表明，QD 和 J-聚集体之间的能量转移（ET）过程是通过偶极-偶极机制介导的。有趣的是，基于Förster 理论的数据分析进一步表明，QD 到 J-聚集体的 ET 非常高，表明无机 QD 和有机 J-聚集体之间存在有效的电子偶联。Zeta 电位测量和热力学计算表明，QD 和有机染料之间的相互作用是静电驱动的，并且 QD 上有机染料的缔合在热力学上是可行的。本研究的结果有望有助于设计高效的纳米级光收集器件。此外，对 QD 的荧光显微镜和毒性研究也表明它们适用于生物应用。
