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Fluorescence enhancement of surface plasmon coupled emission by Au nanobipyramids and its modulation effect on multi-wavelength radiation
Analytica Chimica Acta ( IF 6.2 ) Pub Date : 2023-05-31 , DOI: 10.1016/j.aca.2023.341460
Kai-Xin Xie 1 , Rui-Ping Huo 1 , Xiu-Li Song 1 , Qiao-Ling Liu 1 , Yue Jiang 1 , Yu-Han Li 1 , Lu-Lu Dong 1 , Jia-Xin Cheng 1
Affiliation  

Surface plasmon coupled emission (SPCE), a novel surface-enhanced fluorescence technique, can generate directional and amplified radiation by the intense interaction between fluorophores and surface plasmons (SPs) of metallic nanofilms. For plasmon-based optical systems, the strong interaction between localized and propagating SPs and “hot spot” structures show great potential to significantly improve the electromagnetic (EM) field and modulate optical properties. Au nanobipyramids (NBPs) with two sharp apexes to enhance and restrict the EM field were introduced through electrostatic adsorption to achieve a mediated fluorescence system, and the emission signal enhancement was realized by factors over 60 compared with the normal SPCE. It has been demonstrated that the intense EM field produced by the NBPs assembly is what triggered the unique enhancement of SPCE by Au NBPs, which effectively overcomes the inherent signal quenching of SPCE for ultrathin sample detection. This remarkable enhanced strategy offers the chance to improve the detection sensitivity for plasmon-based biosensing and detection systems, and expand the range of applications for SPCE in bioimaging with more comprehensive and detailed information acquisition. The enhancement efficiency for various emission wavelengths was investigated in light of the wavelength resolution of SPCE, and it was discovered that enhanced emission for multi-wavelength could be successfully detected through the different emission angles due to the angular displacement caused by wavelength change. Benefit from this, the Au NBP modulated SPCE system was employed for multi-wavelength simultaneous enhancement detection under a single collection angle, which could broaden the application of SPCE in simultaneous sensing and imaging for multi-analytes, and expected to be used for high throughput detection of multi-component analysis.



中文翻译:

Au纳米双锥体表面等离子体耦合发射的荧光增强及其对多波长辐射的调制作用

表面等离子体耦合发射(SPCE)是一种新型表面增强荧光技术,可以通过金属纳米膜的荧光团和表面等离子体(SP)之间的强烈相互作用产生定向和放大的辐射。对于基于等离子体的光学系统,局域和传播的 SP 与“热点”结构之间的强相互作用显示出显着改善电磁 (EM) 场和调制光学特性的巨大潜力。通过静电吸附引入具有两个尖峰的金纳米双锥体(NBP)来增强和限制电磁场,实现介导荧光系统,与普通SPCE相比,发射信号增强了60倍以上。事实证明,NBPs组装产生的强电磁场触发了Au NBPs对SPCE的独特增强,有效克服了SPCE在超薄样品检测中固有的信号猝灭。这种显着的增强策略提供了提高基于等离子体的生物传感和检测系统的检测灵敏度的机会,并通过更全面和详细的信息采集扩大了 SPCE 在生物成像中的应用范围。根据SPCE的波长分辨率研究了不同发射波长的增强效率,发现由于波长变化引起的角位移,可以通过不同的发射角成功地检测到多波长的增强发射。受益于此,

更新日期:2023-06-04
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