Core-shell Fe3O4@Ag magnetic nanoparticles detection using spinvalve GMR sensing element in the wheatstone bridge circuit
Penulis/Author
NUR AJI WIBOWO (1); JUHARNI (2); TAUFIKUDDIN A (3); LIA SAPTINI H (4); Prof. Dr. Harsojo, SU., M.Sc. (5); Prof. Dr.Eng. Edi Suharyadi, S.Si., M.Eng. (6)
Tanggal/Date
9 2020
Kata Kunci/Keyword
Abstrak/Abstract
Core–shell Fe3O4@Ag magnetic nanoparticles(MNPs)integrated with a Wheatstone bridge-giant
magnetoresistance (GMR)sensor provide access to GMR-based biosensors. The Fe3O4 nanoparticles
synthesized using the coprecipitation method demonstrated 77 emu g?1 of magnetization saturation
(MS), 51 Oe of coercivity (HC), and particle size of 11 nm. Furthermore, core–shell Fe3O4@Ag MNPs
prepared by the aqua-solution method possessed 53 emu g?1 of MS, 145 Oe of HC, and 17 nm of
particle size. This high MS 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 Fe3O4with the Fe3O4@Ag nanoparticles through an output voltage increase
corresponding to a decrease in MS. The output signal of the sensor responds linearly to an increase
in the core–shell Fe3O4@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).
Rumpun Ilmu
Fisika
Bahasa Asli/Original Language
English
Level
Internasional
Status
Dokumen Karya
No
Judul
Tipe Dokumen
Aksi
1
Core-shell Fe3O4@Ag magnetic nanoparticles detection using spin- valve GMR sensing element in the wheatstone bridge circuit.pdf
