猝灭(荧光)
石墨烯
发光
氧化物
光子上转换
离子
纳米颗粒
费斯特共振能量转移
材料科学
共振(粒子物理)
光化学
化学物理
激发
纳米技术
光电子学
化学
原子物理学
荧光
物理
光学
有机化学
量子力学
冶金
作者
Diego Méndez-González,Óscar G. Calderón,Sonia Melle,J. G. Izquierdo,Luis Bañares,David López‐Díaz,M. Mercedes Velázquez,Enrique López‐Cabarcos,Jorge Rubio‐Retama,Marco Laurenti
标识
DOI:10.1016/j.jcis.2020.04.076
摘要
Upconversion nanoparticles (UCNP) are increasingly used due to their advantages over conventional fluorophores, and their use as resonance energy transfer (RET) donors has permitted their application as biosensors when they are combined with appropriate RET acceptors such as graphene oxide (GO). However, there is a lack of knowledge about the design and influence that GO composition produces over the quenching of these nanoparticles that in turn will define their performance as sensors. In this work, we have analysed the total quenching efficiency, as well as the actual values corresponding to the RET process between UCNPs and GO sheets with three different chemical compositions. Our findings indicate that excitation and emission absorption by GO sheets are the major contributor to the observed luminescence quenching in these systems. This challenges the general assumption that UCNPs luminescence deactivation by GO is caused by RET. Furthermore, RET efficiency has been theoretically calculated by means of a semiclassical model considering the different nonradiative energy transfer rates from each Er3+ ion to the GO thin film. These theoretical results highlight the relevance of the relative positions of the Er3+ ions inside the UCNP with respect to the GO sheet in order to explain the RET-induced efficiency measurements.
科研通智能强力驱动
Strongly Powered by AbleSci AI