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胶体量子点有序阵列和自组装金纳米粒子单层的混合纳米结构,用于增强荧光。

Hybrid nanostructures of well-organized arrays of colloidal quantum dots and a self-assembled monolayer of gold nanoparticles for enhanced fluorescence.

机构信息

Institute for Molecular Engineering, 5747 South Ellis Ave, University of Chicago, Chicago, IL 60637, USA.

出版信息

Nanotechnology. 2016 Jul 15;27(28):285301. doi: 10.1088/0957-4484/27/28/285301. Epub 2016 Jun 2.

Abstract

Hybrid nanomaterials comprised of well-organized arrays of colloidal semiconductor quantum dots (QDs) in close proximity to metal nanoparticles (NPs) represent an appealing system for high-performance, spectrum-tunable photon sources with controlled photoluminescence. Experimental realization of such materials requires well-defined QD arrays and precisely controlled QD-metal interspacing. This long-standing challenge is tackled through a strategy that synergistically combines lateral confinement and vertical stacking. Lithographically generated nanoscale patterns with tailored surface chemistry confine the QDs into well-organized arrays with high selectivity through chemical pattern directed assembly, while subsequent coating with a monolayer of close-packed Au NPs introduces the plasmonic component for fluorescence enhancement. The results show uniform fluorescence emission in large-area ordered arrays for the fabricated QD structures and demonstrate five-fold fluorescence amplification for red, yellow, and green QDs in the presence of the Au NP monolayer. Encapsulation of QDs with a silica shell is shown to extend the design space for reliable QD/metal coupling with stronger enhancement of 11 times through the tuning of QD-metal spatial separation. This approach provides new opportunities for designing hybrid nanomaterials with tailored array structures and multiple functionalities for applications such as multiplexed optical coding, color display, and quantum transduction.

摘要

由胶体半导体量子点(QDs)在金属纳米颗粒(NPs)附近的紧密排列组成的混合纳米材料代表了一种有吸引力的高性能、光谱可调谐光子源,具有可控的光致发光。此类材料的实验实现需要具有明确定义的 QD 阵列和精确控制的 QD-金属间隔。通过一种协同结合横向限制和垂直堆叠的策略解决了这一长期存在的挑战。具有定制表面化学的光刻生成的纳米级图案通过化学图案定向组装将 QD 选择性地限制在高有序的阵列中,而随后涂覆单层密排 Au NPs 则引入了增强荧光的等离子体成分。结果表明,所制备的 QD 结构在大面积有序阵列中具有均匀的荧光发射,并在 Au NP 单层存在的情况下显示出红色、黄色和绿色 QD 的荧光放大五倍。用二氧化硅壳封装 QD 显示出扩展了可靠的 QD/金属耦合的设计空间,通过调整 QD-金属空间分离可实现 11 倍的增强。这种方法为设计具有定制阵列结构和多种功能的混合纳米材料提供了新的机会,例如用于多路光编码、彩色显示和量子转导的应用。

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