Microwave-Assisted Growth of Silver Nanoparticle Films with Tunable Plasmon Properties and Asymmetrical Particle Geometr
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Microwave-Assisted Growth of Silver Nanoparticle Films with Tunable Plasmon Properties and Asymmetrical Particle Geometry for Applications as Radiation Sensors E. J. Guidelli 1,2 & L. F. Araujo 3 & A. C. A. Assunção 1 & I. C. S. Carvalho 3 & D. R. Clarke 2 & O. Baffa 1 Received: 18 November 2019 / Accepted: 10 March 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract 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. Keywords Film growth . Silver nanoparticles . Optically stimulated luminescence . Metal enhanced luminescence . Dosimetry . SERS
Introduction Plasmon-enhanced luminescence is a powerful approach for enhancing many technologies such as the development of sensitive biosensors [1], the design of new fluorescence-based vapor sensors, and the enhancement of single photon emission of Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11468-020-01150-6) contains supplementary material, which is available to authorized users. * E. J. Guidelli [email protected] 1
Departamento de Física, FFCLRP-Universidade de São Paulo, Ribeirão Preto, SP 14040-901, Brazil
2
School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
3
Departamento de Física, Pontifícia Universidade Católica, Rio de Janeiro, RJ 22451-900, Brazil
quantum-dots [2]. The enhancement of luminescence processes is attributed to amplification of the local electric field near the metal nanostructures (nanoparticles or thin films) under plasmon resonance conditions, resulting in increased excitation rates of adjacent luminophores and/or in energy transfer from the excited luminescent centers to the
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