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首页> 外文期刊>RSC Advances >Photophysical deactivation behaviour of Rhodamine B using different graphite materials
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Photophysical deactivation behaviour of Rhodamine B using different graphite materials

机译：使用不同石墨材料的若丹明B的光物理失活行为

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In the present work, an attempt has been made to elucidate the structural features of synthesized graphite materials, i.e. , expanded graphite (EG) and an expanded graphite/silver nanoparticles (EG/AgNPs) nanocomposite. In order to obtain knowledge about the functional groups present, the interlayer spacing between the carbon layers, topographical features, and the characterization of the materials were carried out using Fourier-transformer infrared spectroscopy, X-ray diffraction, Raman spectroscopy, field emission scanning electron microscopy-energy dispersive X-ray spectroscopy and atomic force microscope. Furthermore, the quenching efficiency of the synthesized graphite materials was also compared using Rhodamine B (Rhd B) as a fluorescent probe. The non-linear behaviour of the Stern–Volmer plots suggested that the complex quenching mechanism (a combination of static and dynamic quenching) was responsible for the decrease in photoluminescence intensity. At a lower concentration of the quencher, the static quenching mechanism was dominant whereas at a higher concentration dynamic processes seemed to be more likely. The binding strength of the complexation between the fluorophore and the quencher at lower concentrations was studied in detail for both of the synthesized materials. The analysis showed that the EG/AgNPs exhibited better quenching efficiency and possessed a strong binding strength in comparison to EG. The thermodynamic parameters of this association suggested that the interaction process was spontaneous and exothermic in nature. Thus, this work offers helpful insights into the fluorescence quenching mechanisms of the Rhd B/EG and its composite system.
机译：在目前的工作中，已经尝试阐明合成石墨材料的结构特征，即膨胀石墨（EG）和膨胀石墨/银纳米颗粒（EG / AgNPs）纳米复合材料。为了获得有关存在的官能团的知识，使用傅里叶变换红外光谱，X射线衍射，拉曼光谱，场发射扫描电子对碳层之间的层间距，形貌特征以及材料的表征进行了研究。显微镜-能量色散X射线光谱和原子力显微镜。此外，还使用罗丹明B（Rhd B）作为荧光探针比较了合成石墨材料的淬灭效率。 Stern-Volmer图的非线性行为表明，复杂的猝灭机制（静态和动态猝灭的组合）是导致光致发光强度降低的原因。在较低浓度的淬灭剂下，静态淬灭机理占主导地位，而在较高浓度下，动态过程似乎更可能发生。对于这两种合成材料，都对低浓度下的荧光团和猝灭剂之间的络合物的结合强度进行了详细研究。分析表明，与EG相比，EG / AgNP表现出更好的淬灭效率并且具有很强的结合强度。这种联系的热力学参数表明，相互作用过程是自然的并且是放热的。因此，这项工作为Rhd B / EG及其复合体系的荧光猝灭机理提供了有益的见解。

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