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Microstructures, absorption spectra, and magnetic properties of Core-shell Fe₃O₄@Ag nanoparticles for enhancing sensitivity of Surface Plasmon Resonance (SPR) sensor

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dc.contributor.author Juharni
dc.contributor.author Ilyas Maulana Yahya
dc.contributor.author Edi Suharyadi
dc.contributor.author Takeshi Kato
dc.contributor.author Satoshi Iwata
dc.date.accessioned 2025-07-02T07:52:46Z
dc.date.available 2025-07-02T07:52:46Z
dc.date.issued 2021-07
dc.description.abstract The purpose of this study is to enhance the sensitivity of Surface Plasmon Resonance (SPR) sensor using core-shell Fe₃O₄@Ag nanoparticles (NPs). Fe₃O₄@Ag NPs were synthesized by co-precipitation method with various concentration of Ag as a shell. The crystal structure of Fe₃O₄ corresponds to the cubic inverse spinel structure. The particle size of Fe₃O₄@Ag NPs with Ag concentration of 40mM is 13.8 nm. The saturation magnetization (Ms), and coercivity field (Hc) of Fe₃O₄@Ag NPs with Ag concentration of 20mM is 52.9 emu/g and 157.2 Oe, respectively, and then decreased with the increase of Ag concentration. An intensity of absorption peak increased with the increase of Ag concentration. A spherical nanoparticle consisting of a spherical Fe₃O₄ core covered by an Ag shell, was used as an active material to increase the signal detection of SPR, with a wavelength of 632.8 nm in the Kretschmann configuration. The system consists of a three-layer materials, i.e., prism/Au/Fe₃O₄@Ag NPs. The results show that the SPR angle shifted to the larger angle of incident light by using Fe₃O₄@Ag NPs and the addition of a core-shell in the conventional SPR-based biosensor leads to the enhancement of the SPR biosensor sensitivity.
dc.identifier.uri https://ijneam.unimap.edu.my/
dc.identifier.uri https://hdl.handle.net/20.500.14170/14035
dc.language.iso en
dc.publisher Universiti Malaysia Perlis (UniMAP)
dc.relation.ispartof International Journal of Nanoelectronics and Materials (IJNeaM)
dc.relation.issn 1985-5761
dc.subject Surface Plasmon Resonance (SPR)
dc.subject Fe₃O₄@Ag
dc.subject Core-shell
dc.subject Sensitivity
dc.title Microstructures, absorption spectra, and magnetic properties of Core-shell Fe₃O₄@Ag nanoparticles for enhancing sensitivity of Surface Plasmon Resonance (SPR) sensor
dc.type Resource Types::text::journal::journal article
dspace.entity.type Publication
oaire.citation.endPage 218
oaire.citation.issue 3
oaire.citation.startPage 209
oaire.citation.volume 14
oairecerif.author.affiliation Universitas Gadjah Mada
oairecerif.author.affiliation Universitas Gadjah Mada
oairecerif.author.affiliation Universitas Gadjah Mada
oairecerif.author.affiliation Nagoya University
oairecerif.author.affiliation Nagoya University
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International Journal of Nanoelectronics and Materials (IJNeaM)