Silver Nanoparticle Films with Highly Tunable Plasmon Properties: Tuning the Plasmon Resonance Band for X-Ray Detection
Eder Guidelli
Universidade de São Paulo
Ph.D in Physics Applied to Medicine and Biology and BSc. degree in Medical Physics (2009) both by the University of São Paulo. My research is focused on the application of Nanotechnology in Medical Physics. I developed part of my Ph.D thesis at Harvard University to produce nano-structured materials metal-semiconducting core-shell nanoparticles for application as ionizing radiation detectors. In 2016-2017 I held a post-doctoral position in the Massachusetts Institute of Technology, working with microfluidic technology for controlled production of quantum-dots. Currently, I have a Professorship at the Physics Department - FFCLRP- University of Sao Paulo.
Abstract
Plasmon-enhanced luminescence is a powerful approach for enhancing many sensing technologies but appropriate tuning of the plasmon band with the excitation and/or emission band of the luminescent species remains a... [ view full abstract ]
- Plasmon-enhanced luminescence is a powerful approach for enhancing many sensing technologies but appropriate tuning of the plasmon band with the excitation and/or emission band of the luminescent species remains a challenge[1–3]. We developed a simple and fast microwave-assisted method to grow silver nanoparticle films with tunable plasmon resonance band. The plasmonic properties can be easily tuned by controlling the microwaving time and the number of deposition cycles. Films can be grown with microwaving times as short as 20 s. Microwaving time of 30 s leads for films with a single well-defined plasmon resonance band (400 nm), whereas films produced with times longer than 40 s presented higher wavelength resonances modes, with at least two distinguishable plasmon resonance bands at 400 nm and 500 nm. The films were employed to enhance the sensitivity of x-ray detectors, which was assessed by the luminescence emitted from irradiated KCl crystals by Optically Stimulated Luminescence (OSL). 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. These findings reveal the versatility of the method developed here to produce silver nanoparticles films with tunable plasmonic properties, standing as promising platform for developing more sensitive, and miniaturized, radiation detectors as well as advanced sensing technologies involving plasmon enhanced luminescence and SERS.
References
[1] K. a Willets, R.P. Van Duyne, Localized surface plasmon resonance spectroscopy and sensing., Annu. Rev. Phys. Chem. 58 (2007) 267–97. doi:10.1146/annurev.physchem.58.032806.104607.
[2] E.J. Guidelli, A.P. Ramos, O. Baffa, Optically Stimulated Luminescence Under Plasmon Resonance Conditions Enhances X-Ray Detection, Plasmonics. 9 (2014). doi:10.1007/s11468-014-9713-4.
[3] E.J. Guidelli, A.P. Ramos, O. Baffa, Silver nanoparticle films for metal enhanced luminescence: Toward development of plasmonic radiation detectors for medical applications, Sensors Actuators, B Chem. 224 (2016). doi:10.1016/j.snb.2015.10.024.
Authors
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Eder Guidelli
(Universidade de São Paulo)
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David Clarke
(Harvard University)
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Oswaldo Baffa
(Universidade de São Paulo)
Topic Areas
Photonic & plasmonic nanomaterials , Enhanced spectroscopy and sensing , Optical sensing from solid state to bio-medicine
Session
OS2a-A » Enhanced spectroscopy and sensing (14:30 - Tuesday, 2nd October, AUDITORIUM)
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