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首页> 外文期刊>Chemistry: A European journal >A Self-Assembled Nanohybrid Composed of Fluorophore-Phenylamine Nanorods and Ag Nanocrystals: Energy Transfer, Wavelength Shift of Fluorescence and TPEF Applications for Live-Cell Imaging
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A Self-Assembled Nanohybrid Composed of Fluorophore-Phenylamine Nanorods and Ag Nanocrystals: Energy Transfer, Wavelength Shift of Fluorescence and TPEF Applications for Live-Cell Imaging

机译：由荧光团-苯胺纳米棒和Ag纳米晶体组成的自组装纳米杂化：能量转移，荧光的波长位移和TPEF在活细胞成像中的应用。

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摘要

A fluorophore-phenylamine derivative (L) has been coupled with silver nanocrystals (NCs) to construct an L-Ag nanohybrid. Owing to synergic effects of the L and Ag components, the exciton-plasmon interactions between L and Ag increase the strength of the donor-acceptor interaction within the nanohybrid, a fact that results in an energy-transfer process and further brings about a dramatic redshift of single-photon absorption and fluorescence, and a decreased fluorescence FL lifetime. The coupling effect also leads to enhancement of a series of nonlinear optical properties, including two-photon-excited fluorescence (TPEF), two-photon-absorption (TPA) cross section (δ), two-photonabsorption coefficient (β), nonlinear refractive index (γ), and third order nonlinear optical susceptibility (χ~((3))). The enhanced two-photon fluorescence of the nanohybrid is proven to be potentially useful for two-photon microscopy of live cells, such as HepG_2. Moreover, cytotoxicity tests show that the low-micromolar concentrations of the nanohybrid do not cause significant reduction in cell viability over a period of at least 24 h and should be safe for further biological studies.
机译：荧光团-苯胺衍生物（L）已与银纳米晶体（NC）偶联以构建L-Ag纳米杂化物。由于L和Ag组分的协同作用，L和Ag之间的激子-等离子体激元相互作用增加了纳米杂化物中供体-受体相互作用的强度，这一事实导致了能量转移过程，并进一步引起了剧烈的红移。单光子吸收和荧光的变化，以及降低的荧光FL寿命。耦合效应还导致一系列非线性光学特性的增强，包括双光子激发荧光（TPEF），双光子吸收（TPA）横截面（δ），双光子吸收系数（β），非线性折射折射率（γ）和三阶非线性光学磁化率（χ〜（（3）））。纳米杂合体的增强的双光子荧光被证明对活细胞（例如HepG_2）的双光子显微镜检查有潜在的帮助。此外，细胞毒性测试表明，低微摩尔浓度的纳米杂交体在至少24小时内不会引起细胞活力的显着降低，因此对于进一步的生物学研究应该是安全的。

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