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On the quenching of semiconductor quantum dot photoluminescence by proximal gold nanoparticles

机译：近端金纳米粒子对半导体量子点光致发光的猝灭

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摘要

Luminescent quantum dots (QDs) were proven to be very effective fluorescence resonance energy transfer donors with an array of organic dye acceptors, and several fluorescence resonance energy transfer based biosensing assemblies utilizing QDs have been demonstrated in the past few years. Conversely, gold nanoparticles (Au-NPs) are known for their capacity to induce strong fluorescence quenching of conventional dye donors. Using a rigid variable-length polypeptide as a bifunctional biological linker, we monitor the photoluminescence quenching of CdSe-ZnS QDs by Au-NP acceptors arrayed around the QD surface, where the center-to-center separation distance was varied over a broad range of values (similar to 50-200 angstrom). We measure the Au-NP-induced quenching rates for such OD conjugates using steady-state and time-resolved fluorescence measurements and examine the results within the context of theoretical treatments based on the Forster dipole-dipole resonance energy transfer, dipole-metal particle energy transfer, and nanosurface energy transfer. Our results indicate that nonradiative quenching of the OD emission by proximal Au-NPs is due to long-distance dipole-metal interactions that extend significantly beyond the classical Forster range, in agreement with previous studies using organic dye-Au-NP donor-acceptor pairs.
机译：事实证明，发光量子点（QD）是具有一系列有机染料受体的非常有效的荧光共振能量转移供体，并且在过去几年中，已经证明了几种利用QD的基于荧光共振能量转移的生物传感组件。相反，金纳米颗粒（Au-NPs）具有诱导常规染料供体强烈荧光猝灭的能力。使用刚性可变长度多肽作为双功能生物接头，我们监测Qd表面周围排列的Au-NP受体对CdSe-ZnS QD的光致发光猝灭，其中中心到中心的分离距离在很宽的范围内变化。值（类似于50-200埃）。我们使用稳态和时间分辨荧光测量来测量此类OD共轭物的Au-NP诱导的猝灭速率，并在基于Forster偶极-偶极共振能量转移，偶极-金属粒子能的理论处理的背景下检查结果转移和纳米表面能量转移。我们的结果表明，近端Au-NPs对OD发射的非辐射淬灭是由于远距离偶极金属相互作用大大超出了经典的Forster范围，这与先前使用有机染料-Au-NP供体-受体对的研究一致。

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