Microwave-Assisted Synthesis of Silver Nanoparticles: Effect of Reaction Temperature and Precursor Concentration on Fluo
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ORIGINAL PAPER
Microwave-Assisted Synthesis of Silver Nanoparticles: Effect of Reaction Temperature and Precursor Concentration on Fluorescent Property Hossein Barani1
•
Boris Mahltig2
Received: 19 May 2020 / Accepted: 13 November 2020 Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The fluorescent silver nanoparticles were synthesized using trisodium citrate as a reducing and stabilizing agent in a microwave-assisted reduction process. The influence of synthesizing parameters such as reaction duration, temperature, and trisodium citrate concentration (100, 200, and 400 ppm) were examined on the characteristics and fluorescent properties of synthesized silver nanoparticles (AgNPs). The formation of AgNPs was studied by UV–Vis absorption spectroscopy, X-ray diffraction, ATR-FTIR spectra, and scanning electron microscopy. The low concentration compared to the high concentration of trisodium citrate resulted in a prolonged reduction process, and also the high concentration resulted in the formation of smaller AgNPs (44 nm). The fluorescence emission spectra of the synthesized colloidal AgNPs demonstrated a quite explicit emission peak centered around 335 nm. However, the higher reaction temperature (above 100 C) resulted in a sharp and narrow emission peak. The synthesized silver nanoparticles exhibited a suitable fluorescent property, which was reliant on the size of synthesized AgNPs. Keywords Silver nanoparticle Surface plasmon resonance Particle size Fluorescence
Introduction Fluorescence is a luminescence process that occurs when an atom or molecule relaxes to its ground state after being electrically excited by emitting light. Recent research has revealed that nanoparticles, especially small clusters, have improved the fluorescence emission over the bulk [1–4]. The fluorescent properties of metal clusters are reported firstly in 1969 by Mooradian [1] with the observation of optically excited radiative recombination of electrons and holes in metal. The fluorescent metal nanoparticles (NPs) have received a great deal of interest during the last few
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10876-020-01945-x) contains supplementary material, which is available to authorized users. & Hossein Barani [email protected] 1
University of Birjand, 17 Shahrivar Street, Birjand, Iran
2
Faculty of Textile and Clothing Technology, Niederrhein University of Applied Sciences, Mo¨nchengladbach, Germany
years owing to widely used in bioimaging, single-molecule studies, and optical sensing [5]. The NPs present fluorescence emission spectra compared to bulk metals according to their distinct energy states and large surface areas. Recently, Noble NPs (silver and gold) have received considerable attention, basically due to their rich optical properties, such as surface plasmon resonance (SPR), plasmon modulated or enhanced fluorescence, etc. [6–10]. Silver has received more interest in opt
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