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Optical response of a quantum dot-epoxy resin composite: effect of tensile strain

机译：量子点-环氧树脂复合材料的光学响应：拉伸应变的影响

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The structural applications of quantum dots (QDs) can be artificially realized through the preparation of QDs-based structural materials, which have unique characteristics of photoluminescence (PL) in response to mechanical deformation, via the dispersion of quantum dots in various materials, including polymers and plastics. A QDs-based composite consisting of CdSe@ZnS core-shell QDs and a bisphenol-A type epoxy resin has been prepared by mixing a solution of CdSe@ZnS core-shell QDs in chloroform with bisphenol-A type epoxy resin and modified amine at room temperature. The tensile deformation of the tensile specimens made from the QDs-based composite causes a significant change in the PL intensity for large engineering strains, and there is no observable strain-induced shift of the wavelength corresponding to the maximum PL intensity. Two major modes are observed for the temporal variation of the PL intensity of the QDs-based composite coated on AA 7009 tensile specimens under cyclic loading and unloading of small strains. One exhibits in-phase characteristics with strain, and the other exhibits antiphase characteristics with strain. The variation of the PL intensity of the QDs-based composite with tensile strain suggests that there exists strain-dependent photoluminescence, which determines the PL characteristics of the CdSe@ZnS core-shell QDs in the bisphenol-A type epoxy under the irradiation of ultraviolet light. The experimental results demonstrate the potential of developing sensitive opto-mechanical devices from QDs-based composites.
机译：量子点（QDs）的结构应用可以通过制备基于QDs的结构材料来实现，这些结构材料通过将量子点分散在包括聚合物在内的各种材料中，具有响应机械变形的独特光致发光（PL）特性。和塑料。通过将CdSe @ ZnS核壳型量子点在氯仿中的溶液与双酚A型环氧树脂和改性胺混合，制得由CdSe @ ZnS核壳型量子点和双酚A型环氧树脂组成的QDs基复合材料。室内温度。由基于QDs的复合材料制成的拉伸试样的拉伸变形会导致大工程应变的PL强度发生显着变化，并且没有观察到应变引起的对应于最大PL强度的波长偏移。在循环加载和卸载小应变下，观察到AA 7009拉伸试样上涂覆的QDs基复合材料的PL强度随时间变化的两种主要模式。一种具有应变的同相特性，另一种具有应变的反相特性。 QDs基复合材料的PL强度随拉伸应变的变化表明存在依赖于应变的光致发光，这决定了双酚A型环氧树脂在紫外线照射下CdSe @ ZnS核壳QDs的PL特性。光。实验结果证明了从基于量子点的复合材料开发敏感的光机械设备的潜力。

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