Core-shell Fe3O4@Ag magnetic nanoparticles detection using spin-valve GMR sensing element in the wheatstone bridge circuit
Core–shell Fe _3 O _4 @Ag magnetic nanoparticles (MNPs) integrated with a Wheatstone bridge-giant magnetoresistance (GMR) sensor provide access to GMR-based biosensors. The Fe _3 O _4 nanoparticles synthesized using the coprecipitation method demonstrated 77 emu g ^−1 of magnetization saturation ( M...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2020-01-01
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| Series: | Materials Research Express |
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| Online Access: | https://doi.org/10.1088/2053-1591/abce87 |
| _version_ | 1797746859294326784 |
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| author | Nur Aji Wibowo Juharni Juharni Taufikuddin Alfansuri Lia Saptini Handriani Harsojo Sabarman Edi Suharyadi |
| author_facet | Nur Aji Wibowo Juharni Juharni Taufikuddin Alfansuri Lia Saptini Handriani Harsojo Sabarman Edi Suharyadi |
| author_sort | Nur Aji Wibowo |
| collection | DOAJ |
| description | Core–shell Fe _3 O _4 @Ag magnetic nanoparticles (MNPs) integrated with a Wheatstone bridge-giant magnetoresistance (GMR) sensor provide access to GMR-based biosensors. The Fe _3 O _4 nanoparticles synthesized using the coprecipitation method demonstrated 77 emu g ^−1 of magnetization saturation ( M _S ), 51 Oe of coercivity ( H _C ), and particle size of 11 nm. Furthermore, core–shell Fe _3 O _4 @Ag MNPs prepared by the aqua-solution method possessed 53 emu g ^−1 of M _S , 145 Oe of H _C, and 17 nm of particle size. This high M _S of nanoparticles not only offer a large induced magnetic field but is sufficient for particle penetration within the biofilms. It was discovered that the sensor can distinguish between the bare Fe _3 O _4 with the Fe _3 O _4 @Ag nanoparticles through an output voltage increase corresponding to a decrease in M _S . The output signal of the sensor responds linearly to an increase in the core–shell Fe _3 O _4 @Ag nanoparticle concentration, owing to an increase in the induced-field. The sensor exhibits better sensitivity when applied in detecting less than 2 g L ^−1 of nanoparticle concentration, that is, 0.76 mV per unit of concentration (g/L). |
| first_indexed | 2024-03-12T15:42:50Z |
| format | Article |
| id | doaj.art-1ea0894b172e419d9271f51fcc2e76f6 |
| institution | Directory Open Access Journal |
| issn | 2053-1591 |
| language | English |
| last_indexed | 2024-03-12T15:42:50Z |
| publishDate | 2020-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | Materials Research Express |
| spelling | doaj.art-1ea0894b172e419d9271f51fcc2e76f62023-08-09T15:53:12ZengIOP PublishingMaterials Research Express2053-15912020-01-0171212610210.1088/2053-1591/abce87Core-shell Fe3O4@Ag magnetic nanoparticles detection using spin-valve GMR sensing element in the wheatstone bridge circuitNur Aji Wibowo0Juharni Juharni1Taufikuddin Alfansuri2Lia Saptini Handriani3Harsojo Sabarman4Edi Suharyadi5https://orcid.org/0000-0002-9845-3707Department of Physics, Universitas Gadjah Mada , Yogyakarta, Indonesia; Department of Physics, Universitas Kristen Satya Wacana , Salatiga, IndonesiaDepartment of Physics, Universitas Gadjah Mada , Yogyakarta, IndonesiaDepartment of Physics, Universitas Gadjah Mada , Yogyakarta, IndonesiaDepartment of Physics, Universitas Gadjah Mada , Yogyakarta, IndonesiaDepartment of Physics, Universitas Gadjah Mada , Yogyakarta, IndonesiaDepartment of Physics, Universitas Gadjah Mada , Yogyakarta, IndonesiaCore–shell Fe _3 O _4 @Ag magnetic nanoparticles (MNPs) integrated with a Wheatstone bridge-giant magnetoresistance (GMR) sensor provide access to GMR-based biosensors. The Fe _3 O _4 nanoparticles synthesized using the coprecipitation method demonstrated 77 emu g ^−1 of magnetization saturation ( M _S ), 51 Oe of coercivity ( H _C ), and particle size of 11 nm. Furthermore, core–shell Fe _3 O _4 @Ag MNPs prepared by the aqua-solution method possessed 53 emu g ^−1 of M _S , 145 Oe of H _C, and 17 nm of particle size. This high M _S of nanoparticles not only offer a large induced magnetic field but is sufficient for particle penetration within the biofilms. It was discovered that the sensor can distinguish between the bare Fe _3 O _4 with the Fe _3 O _4 @Ag nanoparticles through an output voltage increase corresponding to a decrease in M _S . The output signal of the sensor responds linearly to an increase in the core–shell Fe _3 O _4 @Ag nanoparticle concentration, owing to an increase in the induced-field. The sensor exhibits better sensitivity when applied in detecting less than 2 g L ^−1 of nanoparticle concentration, that is, 0.76 mV per unit of concentration (g/L).https://doi.org/10.1088/2053-1591/abce87biosensorcore-shellgiant magnetoresistancemagnetic nanoparticlesmagnetitesilver |
| spellingShingle | Nur Aji Wibowo Juharni Juharni Taufikuddin Alfansuri Lia Saptini Handriani Harsojo Sabarman Edi Suharyadi Core-shell Fe3O4@Ag magnetic nanoparticles detection using spin-valve GMR sensing element in the wheatstone bridge circuit Materials Research Express biosensor core-shell giant magnetoresistance magnetic nanoparticles magnetite silver |
| title | Core-shell Fe3O4@Ag magnetic nanoparticles detection using spin-valve GMR sensing element in the wheatstone bridge circuit |
| title_full | Core-shell Fe3O4@Ag magnetic nanoparticles detection using spin-valve GMR sensing element in the wheatstone bridge circuit |
| title_fullStr | Core-shell Fe3O4@Ag magnetic nanoparticles detection using spin-valve GMR sensing element in the wheatstone bridge circuit |
| title_full_unstemmed | Core-shell Fe3O4@Ag magnetic nanoparticles detection using spin-valve GMR sensing element in the wheatstone bridge circuit |
| title_short | Core-shell Fe3O4@Ag magnetic nanoparticles detection using spin-valve GMR sensing element in the wheatstone bridge circuit |
| title_sort | core shell fe3o4 ag magnetic nanoparticles detection using spin valve gmr sensing element in the wheatstone bridge circuit |
| topic | biosensor core-shell giant magnetoresistance magnetic nanoparticles magnetite silver |
| url | https://doi.org/10.1088/2053-1591/abce87 |
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