A nanohybrid system based on covalently functionalized graphene quantum dots with dithienopyrrole derivative for the sensitive and selective fluorometric detection of Pb2+ ions,Luminescence

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A nanohybrid system based on covalently functionalized graphene quantum dots with dithienopyrrole derivative for the sensitive and selective fluorometric detection of Pb2+ ions
Luminescence ( IF 3.2 ) Pub Date : 2021-07-03 , DOI: 10.1002/bio.4116
Deepa Sebastian ₁ , Sithara Soman ₁ , Kala R ₁

Affiliation

Recently graphene quantum dot (GQD) based nanohybrid materials have received much attention. Herein, a highly fluorescent biocompatible GQD and N-functionalized dithienopyrrole (DTP-PPD) modified nanohybrid system was fabricated (DTP-PPD-fn-GQD) for the first time. Modification resulted in stable fluorescence with a quantum yield of approximately 22% and 36 nm redshift compared to unmodified GQD. The apparent bandgap tuning along with fluorescence property changes was investigated by cyclic voltammetry measurements and density functional theory studies. This water-soluble system was then applied for the sensitive and selective detection of Pb²⁺ ions. As a result of a specific interaction towards Pb²⁺ ions, the fluorescence intensity was quenched. The detection limit is found to be 1.02 nM within the linear range of 3 to 30 nM. Finally, the feasibility of the developed probe was tested with real samples of water. Chemically modified GQDs are already widely exploited for Pb²⁺ sensing, whereas GQD/thiophene-based nanohybrid systems are less utilized. This newly developed nanohybrid of GQD (DTP-PPD-fn-GQD) has excellent fluorescence properties and bandgap tunability. Moreover, effective fluorometric sensing of Pb²⁺ ions in an aqueous medium is well investigated. This gives more insight into developing GQD-based highly promising nanohybrid colorimetric as well as fluorescent sensors.

中文翻译：

基于共价功能化石墨烯量子点和二噻吩并吡咯衍生物的纳米杂化系统，用于对 Pb2+ 离子进行灵敏和选择性的荧光检测

最近，基于石墨烯量子点（GQD）的纳米杂化材料受到了广泛关注。在此，首次制备了高度荧光生物相容性 GQD 和 N 功能化二噻吩并吡咯 (DTP-PPD) 修饰的纳米杂化系统 (DTP-PPD-fn-GQD)。与未修饰的 GQD 相比，修饰产生稳定的荧光，量子产率约为 22%，红移 36 nm。通过循环伏安法测量和密度泛函理论研究研究了表观带隙调谐以及荧光性质的变化。然后将该水溶性系统应用于 Pb ²⁺离子的灵敏和选择性检测。由于对 Pb ²⁺的特定相互作用离子，荧光强度被淬灭。在 3 到 30 nM 的线性范围内发现检测限为 1.02 nM。最后，用真实的水样测试了所开发探头的可行性。化学修饰的 GQD 已被广泛用于 Pb ²⁺传感，而基于 GQD/噻吩的纳米杂化系统使用较少。这种新开发的 GQD 纳米杂化物 (DTP-PPD-fn-GQD) 具有出色的荧光特性和带隙可调性。此外，对水性介质中 Pb ²⁺离子的有效荧光传感进行了很好的研究。这为开发基于 GQD 的极具前景的纳米混合比色和荧光传感器提供了更多见解。

更新日期：2021-07-03

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