Abstract：
BACKGROUND: Precise localized printing of plasmonic nanoparticles at desired locations can find a plethora of applications in diverse areas, including nanophotonics, nanomedicine, and microelectronics. The focused laser beam-assisted optical printing technique has illustrated its potential for the localized printing of differently shaped plasmonic particles. However, the technique is either time-consuming or often requires focused optical radiation, limiting its practical applications. While the optothermal printing technique has recently emerged as a promising technique for the direct and rapid printing of plasmonic nanoparticles onto transparent substrates at lower laser intensities, its potential to print the plasmonic nanoparticles to the core of the optical fiber platforms and utilize it for biological cell trapping as well as an analytical platform remains unexplored.
RESULTS: Herein, we demonstrate the thermal-convection-assisted printing of the Ag plasmonic nanoparticles from the plasmonic colloidal solution onto the core of single-mode optical fiber and its multi-functional applications. The direct printing of plasmonic structure on the fiber core via the thermal-convection mechanism is devoid of the requirement of any additional chemical ligand to the fiber core. Further, we demonstrated the potential of the developed plasmonic fiber probe as a multifunctional surface-enhanced Raman spectroscopic (SERS) platform for sensing, chemical reaction monitoring, and single-cell studies. The developed SERS fiber probe is found to detect crystal violet in an aqueous solution as low as 100 pM, with a plasmonic enhancement of 107. Additionally, the capability of the fiber-tip platform to monitor the surface plasmon-driven chemical reaction of 4-nitrothiophenol (4NTP) dimerizing into p, p\'-dimercaptoazobenzene (DMAB) is demonstrated. Further, the versatility of the fiber probe as an effective platform for opto-thermophoretic trapping of single biological cells such as yeast, along with its Raman spectroscopic studies, is also shown here.
CONCLUSIONS: In this study, we illustrate for the first time the optothermal direct printing of plasmonic nanoparticles onto the core of a single-mode fiber. Further, the study demonstrates that such plasmonic nanoparticle printed fiber tip can act as a multi-functional analytical platform for optothermally trap biological particles as well as monitoring plasmon-driven chemical reactions. In addition, the plasmonic fiber tip can be used as a cost-effective SERS analytical platform and is thus expected to find applications in diverse areas.
RESULTS: Herein, we demonstrate the thermal-convection-assisted printing of the Ag plasmonic nanoparticles from the plasmonic colloidal solution onto the core of single-mode optical fiber and its multi-functional applications. The direct printing of plasmonic structure on the fiber core via the thermal-convection mechanism is devoid of the requirement of any additional chemical ligand to the fiber core. Further, we demonstrated the potential of the developed plasmonic fiber probe as a multifunctional surface-enhanced Raman spectroscopic (SERS) platform for sensing, chemical reaction monitoring, and single-cell studies. The developed SERS fiber probe is found to detect crystal violet in an aqueous solution as low as 100 pM, with a plasmonic enhancement of 107. Additionally, the capability of the fiber-tip platform to monitor the surface plasmon-driven chemical reaction of 4-nitrothiophenol (4NTP) dimerizing into p, p\'-dimercaptoazobenzene (DMAB) is demonstrated. Further, the versatility of the fiber probe as an effective platform for opto-thermophoretic trapping of single biological cells such as yeast, along with its Raman spectroscopic studies, is also shown here.
CONCLUSIONS: In this study, we illustrate for the first time the optothermal direct printing of plasmonic nanoparticles onto the core of a single-mode fiber. Further, the study demonstrates that such plasmonic nanoparticle printed fiber tip can act as a multi-functional analytical platform for optothermally trap biological particles as well as monitoring plasmon-driven chemical reactions. In addition, the plasmonic fiber tip can be used as a cost-effective SERS analytical platform and is thus expected to find applications in diverse areas.
摘要：
背景：等离子体纳米颗粒在所需位置的精确局部印刷可以在不同领域找到过多的应用，包括纳米光子学，纳米医学,和微电子。聚焦激光束辅助光学印刷技术已经说明了其用于不同形状的等离子体粒子的局部印刷的潜力。然而,该技术要么耗时，要么通常需要聚焦光辐射，限制其实际应用。虽然光热印刷技术最近已成为一种有前途的技术，可在较低的激光强度下将等离子体纳米颗粒直接快速印刷到透明基板上，它将等离子体纳米粒子打印到光纤平台的核心，并将其用于生物细胞捕获以及分析平台的潜力仍未被探索。
结果：这里，我们展示了从等离子体胶体溶液到单模光纤核心上的Ag等离子体纳米粒子的热对流辅助印刷及其多功能应用。等离子体结构经由热对流机制在纤维芯上的直接印刷不需要任何额外的化学配体到纤维芯。Further,我们展示了开发的等离子体光纤探针作为多功能表面增强拉曼光谱（SERS）传感平台的潜力，化学反应监测,和单细胞研究。发现开发的SERS纤维探针可以检测低至100pM的水溶液中的结晶紫，等离子体激元增强107。此外,纤维尖端平台监测表面等离子体驱动的4-硝基苯硫酚（4NTP）二聚成p的化学反应的能力，证明了对二巯基偶氮苯（DMAB）。Further,多功能性的纤维探针作为一个有效的平台，光-热血球捕获的单个生物细胞，如酵母，随着它的拉曼光谱研究，也显示在这里。
结论：在这项研究中，我们首次说明了等离子体纳米粒子的光热直接印刷到单模光纤的核心上。Further,该研究表明，这种等离子体纳米颗粒印刷的纤维尖端可以作为一个多功能的分析平台，用于光热捕获生物颗粒以及监测等离子体驱动的化学反应。此外,等离子体激元纤维尖端可用作具有成本效益的SERS分析平台，因此有望在各个领域找到应用。
结果：这里，我们展示了从等离子体胶体溶液到单模光纤核心上的Ag等离子体纳米粒子的热对流辅助印刷及其多功能应用。等离子体结构经由热对流机制在纤维芯上的直接印刷不需要任何额外的化学配体到纤维芯。Further,我们展示了开发的等离子体光纤探针作为多功能表面增强拉曼光谱（SERS）传感平台的潜力，化学反应监测,和单细胞研究。发现开发的SERS纤维探针可以检测低至100pM的水溶液中的结晶紫，等离子体激元增强107。此外,纤维尖端平台监测表面等离子体驱动的4-硝基苯硫酚（4NTP）二聚成p的化学反应的能力，证明了对二巯基偶氮苯（DMAB）。Further,多功能性的纤维探针作为一个有效的平台，光-热血球捕获的单个生物细胞，如酵母，随着它的拉曼光谱研究，也显示在这里。
结论：在这项研究中，我们首次说明了等离子体纳米粒子的光热直接印刷到单模光纤的核心上。Further,该研究表明，这种等离子体纳米颗粒印刷的纤维尖端可以作为一个多功能的分析平台，用于光热捕获生物颗粒以及监测等离子体驱动的化学反应。此外,等离子体激元纤维尖端可用作具有成本效益的SERS分析平台，因此有望在各个领域找到应用。
