Mixture of silver and iron oxide nanoparticles produced by chemical methods
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Mixture of silver and iron oxide nanoparticles produced by chemical methods Naoki Nishida1 · Shota Amagasa1 · Yoshio Kobayashi2,3 · Yasuhiro Yamada1
© Springer International Publishing AG 2017
Abstract A mixture of silver and iron oxide nanoparticles were synthesized by the reaction of FeSO4 , AgNO3 , and N2 H4 in the presence of gelatin at room temperature. The silver/iron oxide nanoparticles were subsequently examined using powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and M¨ossbauer spectroscopy. TEM observations revealed two distinct sizes of nanoparticles. The small nanoparticles with diameters of less than 10 nm were assigned to maghemite, and the large particles with diameters of approximately 20 nm were assigned to metallic silver. A M¨ossbauer spectrum of the maghemite nanoparticles at room temperature showed superparamagnetic behavior due to the small particle sizes. The M¨ossbauer spectrum measured at low temperature showed a magnetic sextet and a component of distributed hyperfine magnetic fields (DHMF). The DHMF component corresponded to the surface or defects of the maghemite nanoparticles. Silver enhanced the production of maghemite nanoparticles, and the size of the maghemite particles could be controlled by varying the amount of silver salt. Keywords Silver/iron oxide nanoparticle · Chemical method · Gelatin
This article is part of the Topical Collection on Proceedings of the International Conference on the Applications of the M¨ossbauer Effect (ICAME 2017), Saint-Petersburg, Russia, 3-8 September 2017 Edited by Valentin Semenov Naoki Nishida
[email protected] 1
Department of Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
2
Department of Engineering Science, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
3
Nishina Center for Accelerator-Based Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Hyperfine Interact (2017) 238:71
1 Introduction Magnetic nanoparticles are of significant interest because they have unique physical and chemical properties derived from size effects, including unusual crystal structures and magnetic behavior [1]. These nanoparticles have potential applications in a wide variety of areas, such as nanoelectronics and biomedicine-related fields involving drug delivery, hyperthermia, magnetic resonance imaging (MRI), and biosensing. In addition, iron oxide composited with foreign metallic atoms is of interest because it is known to enhance the magnetic properties and stability [2]. In particular, silver/iron oxide nanoparticles have been extensively used due to their enhanced chemical reactivity, which results from the interactions between the two components [3, 4]. Although several studies have reported that silver/iron oxide nanoparticles are magnetite from X-ray diffraction (XRD) measurements, the samples could not be completely confirmed because magnetite and other iron oxides such as maghemite have very similar patterns.
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