Facile synthesis of luminescent silver nanoparticles and fluorescence interactions with blue-emitting polyarylene ether nitrile
Facile synthesis of luminescent silver nanoparticles and fluorescence interactions with blue-emitting polyarylene ether nitrile
复制标题
发光银纳米颗粒的简便合成以及与发蓝光聚亚芳基醚腈的荧光相互作用
DOI：
10.1039/c4tc02850c
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发表时间：
2015-01-01
影响因子：
6.4
通讯作者：
Liu, Xiaobo
中科院分区：
文献类型：
--
作者：
Jia, Kun;Wang, Pan;Liu, Xiaobo
在这项工作中，荧光银纳米颗粒通过一个简单的一步反应在有机相中合成。它们的荧光发射依赖于激发波长，并且可以通过共振能量转移过程被蓝色发射的本特征荧光聚合物聚苯乙烯醚腈（PEN）有效增强，这一点被时间相关光致发光衰减测量和稳态荧光光谱证实。在N，N-二甲基甲酰胺（DMF）溶剂中，用聚乙烯吡咯烷酮（PVP）还原硝酸银（AgNO3），在氮气气氛下合成了发光银纳米颗粒。结果表明，合成的银纳米颗粒原液在紫外照射下存在明显的表面等离子体共振并伴有微弱的荧光。415 nm处的等离子体消光峰是由较大尺寸的银纳米粒子（Ag NPs, 20 +/- 4 nm）引起的，而550 nm处的弱荧光发射则是由于超小银纳米结构的存在。此外，通过高速离心去除过量的大尺寸银纳米颗粒，上清液中较小的银纳米颗粒（6 +/- 2 nm）的荧光显著增强。更有趣的是，纯化后的较小银纳米粒子表现出与激发波长相关的荧光发射谱，并且在适当的激发下，它们的荧光可以通过来自蓝色发射芳族聚合物的能量供体的共振能量转移过程进一步增强，该聚合物与发光银纳米粒子表现出良好的光谱重叠。
In this work, fluorescent silver nanoparticles were synthesized in an organic phase via a facile one-step reaction. Their fluorescence emission is dependent on the excitation wavelength and can be effectively enhanced by a blue emitting intrinsic fluorescent polymer called polyarylene ether nitrile (PEN) via a resonance energy transfer process, which is confirmed by the time-correlated photoluminescence decay measurement and steady-state fluorescence spectroscopy. Specifically, luminescent Ag nanoparticles were synthesized by reducing silver nitrate (AgNO3) with polyvinylpyrrolidone (PVP) in N,N-dimethylformamide (DMF) solvent under a nitrogen atmosphere. It was found that obvious surface plasmon resonance combined with weak fluorescence under UV irradiation was observed from as-synthesized Ag nanoparticle stock solution. The larger sized silver nanoparticles (Ag NPs, 20 +/- 4 nm) were responsible for the plasmonic extinction peak at 415 nm, while the weak fluorescence emission at around 550 nm was attributed to the presence of ultra-small silver nanostructures. Furthermore, the dramatically enhanced fluorescence was observed from smaller Ag nanoparticles (6 +/- 2 nm) in the supernatant by removing the excess large sized Ag nanoparticles via high speed centrifugation. More interestingly, the purified smaller Ag nanoparticles showed an excitation wavelength dependent fluorescence emission profile, and their fluorescence under appropriate excitation can be further enhanced via the resonance energy transfer process from the energy donor of a blue emitting aromatic polymer that shows good spectral overlap with luminescent silver nanoparticles.