arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.13583physics.optics
收藏

纳米金刚石工程optical-fiber等离子体界面用于灵敏度增强的生物传感

A nanodiamonds-engineered optical-fiber plasmonic interface for sensitivity-enhanced biosensing

Yaofei Chen, Lu Xiao, Longqun Ni, Lei Chen, Gui-shi Liu, Jinde Yin, Peili Zhao, Yunhan Luo, Zhe Chen

摘要:

纳米金刚石具有细胞毒性低、功能多样、荧光可调等优点,在生物医学领域显示出巨大的应用潜力。在这里,我们提出,第一次,我们最好的知识,集成ND的等离子体界面上构建的侧抛光光纤使用滴铸方法。所添加的ND将等离子体界面设计为改善感测场,从而提高灵敏度,此外,灵敏度显著取决于滴铸循环(DC)的数量和ND分散溶液的使用浓度。实验结果表明,适当提高分散体浓度有利于在较少的分散体数量下获得较高的灵敏度,但分散体浓度过高会严重恶化共振凹陷。在实验中,使用最佳的0.2 mg/mL浓度和3个DC,我们实现了最高的RI灵敏度为3582 nm/RIU,与没有NDs修饰的情况相比,其显示出73.8%的增强。以牛血清白蛋白为例,验证了该方法在生物传感中的灵敏度增强作用。通过表征和模拟,探讨了其背后的机制。这项工作为ND开辟了一种新的应用形式,即将ND与等离子体界面集成到高性能生物传感器中。

英文摘要:

Benefitting from the excellent characteristics such as low cytotoxicity, functionalization versatility, and tunable fluorescence, nanodiamonds (NDs) have shown enormous application potentials in the biomedical field. Herein, we proposed, for the first time to our best knowledge, to integrate NDs on a plasmonic interface constructed on a side-polished fiber using drop-casting method. The added NDs engineers the plasmonic interface towards improving the sensing field, thus enhancing the sensitivity, which, moreover, is significantly dependent on the number of drop-casting cycles (DCs) and the used concentration of NDs dispersion solution. Experimental results suggest that properly increasing the NDs dispersion concentration is beneficial to obtain a higher sensitivity while using a fewer number of DCs, but the excessive concentration extremely deteriorates the resonance dip. Experimentally, using the optimal 0.2 mg/mL concentration and 3 DCs, we achieve the highest RI sensitivity of 3582 nm/RIU, which shows an enhancement of 73.8% compared to the case without NDs modification. The sensitivity enhancement in biosensing is also proved by employing bovine serum albumin as a demo. The behind mechanism is explored via characterizations and simulations. This work opens up a new application form for NDs, i.e. integrating NDs with a plasmonic interface towards high-performance biosensing.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑