We report a simple and fast microwave-assisted method to grow silver nanoparticle films with tunable plasmon resonance band. Microwaving time controls nucleation and growth as well as particle agglomeration, cluster formation, particle morphology, and the plasmonic properties. Films produced with times shorter than 30 s presented a single well-defined plasmon resonance band (~ 400 nm), whereas films produced with times longer than 40 s presented higher wavelength resonances modes (> 500 nm). Plasmon band position and intensity can be easily tuned by controlling microwaving time and power. SEM and AFM images suggested the growth of asymmetrical silver nanoparticles. Simulated extinction spectra considering particles as spheres, hemispheres, and spherical caps were performed. The films were employed to enhance the sensitivity of ionizing radiation detectors assessed by optically stimulated luminescence (OSL) via plasmon-enhanced luminescence. By tuning the plasmon resonance band to overlap with the OSL stimulation (530 nm), luminescence enhancements of greater than 100-fold were obtained, demonstrating the importance of tuning the plasmon resonance band to maximize the OSL intensity and detector sensitivity. This versatile method to produce silver nanoparticle films with tunable plasmonic properties is a promising platform for developing small-sized radiation detectors and advanced sensing technologies.

Graphical Abstract

我们报告了一种简单而快速的微波辅助方法来生长具有可调等离振子共振带的银纳米颗粒薄膜。微波时间控制着成核和生长以及颗粒的团聚，簇的形成，颗粒的形貌和等离子体性质。时间短于30 s的薄膜呈现出一个清晰的等离激元共振带（〜400 nm），而时间短于40 s的薄膜呈现出更高的波长共振模式（> 500 nm）。通过控制微波时间和功率，可以轻松地调整等离子带的位置和强度。SEM和AFM图像表明不对称银纳米颗粒的生长。进行了以粒子为球形，半球形和球形帽的模拟消光光谱。该膜用于增强电离辐射探测器的灵敏度，该探测器通过等离激元增强的发光通过光激发发光（OSL）进行评估。通过调整等离子体激元共振带使其与OSL刺激（530 nm）重叠，可以获得大于100倍的发光增强，这表明调整等离子体激元共振带以最大化OSL强度和检测器灵敏度的重要性。这种生产具有可调等离子体特性的银纳米颗粒薄膜的通用方法是开发小型辐射探测器和先进传感技术的有前途的平台。获得了大于100倍的发光增强，这表明调整等离子体激元共振带以最大化OSL强度和检测器灵敏度的重要性。这种生产具有可调等离子体特性的银纳米颗粒薄膜的通用方法是开发小型辐射探测器和先进传感技术的有前途的平台。获得了大于100倍的发光增强，这表明调整等离子体激元共振带以最大化OSL强度和检测器灵敏度的重要性。这种生产具有可调等离子体特性的银纳米颗粒薄膜的通用方法是开发小型辐射探测器和先进传感技术的有前途的平台。

图形概要