Oral presentation in ISMANAM 2013 in Torino (Italy)

1. Meander-line structure for eddycurrent sensing of
superparamagnetic nanoparticles
M. Rivas, D. Lago-Cachón, J. C. Martínez-García, J. A. García
Nanobioanalysis Research Group, University of Oviedo, Spain
Nano
Bio
Análisis

2. Magnetoimpedance-based
detection
(1/4)

3. Surface modified amorphous ribbon based magnetoimpedance biosensor
Magnetoimpedance (MI) changes due to surface modification of the sensitive element
caused by human urine, were studied with the aim of creating a robust biosensor working on
a principle of electrochemical magnetoimpedance spectroscopy. A biosensor prototype ...
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Microwire array for giant magneto-impedance detection of magnetic particles for biosensor
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A new giant magneto-impedance (GMI) biosensor prototype based on a glass-coated
microwires array is reported. The optimal measurement conditions and the influence of a
liquid suspension of commercially available polymer-based magnetic microparticles on ...
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Giant magnetoimpedance-based microchannel system for quick and parallel genotyping of
human papilloma virus type 16/18
... Quick and parallel genotyping of human papilloma virus (HPV) type 16/18 is carried out by a
specially designed giant magnetoimpedance (GMI) based microchannel system. Micropatterned
soft magnetic ribbon exhibiting large GMI ratio serves as the biosensor element. ...
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Surface modified amorphous ribbon based magnetoimpedance biosensor.
Microwire array for giant magneto-impedance detection of magnetic particles for biosensor
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Magneto-impedance sensor for biomedical applications
... A giant-magnetoimpedance-based biosensor prototype was designed and tested by using
simple

4. Magnetoimpedance
Co70Fe5Si10B15
ribbon

5. Samples and methods
Test fixture ribbon to impedance analyser
(1-110 MHz) + Helmholz coils (dc field)
Superparamagnetic 10 nm
Fe3O4 nanoparticles
NPs deposited onto
blotting paper strips

6. NPs detection with Co (GMI)

7. NPs detection
Magnetoimpedance
curve (detail)
Co70Fe5Si10B15 ribbon
Increase of impedance
640 mg Fe3O4

8. Cu-based detection
(2/4)

9. NPs detection with Cu

10. NPs detection with Cu
Cu-ribbon
Co-ribbon

11. Origin of the detection
Switching magnetic moment
Changing magnetic field
Induced electromotive
forces

12. Printed Circuit Board
(3/4)

13. Printed Circuit Board

14. NPs detection with PCB1
PCB1
x5
Cu-ribbon

15. A frequency-related detection

16. 35 mm
Skin effect
400 mm

17. Skin effect
Active area

18. Meander-line circuit

19. NPs detection with meander-structure
Meander
x3
PCB1

20. Planar spiral-like circuit

21. NPs detection with spiral-sensor
Spiral
x7
PCB1

22. Proximity effect
Cross-section of three parallel traces

23. Proximity effect
Cross-section of three parallel traces

24. Planar spiral-like circuit
Ratio
over

25. Planar spiral-like circuit

26. NPs detection with 5-turn spiral
5-turns
x 100
PCB1

27. Conclusions
(4/4)

28. Nanoparticles detection
Detection with copper: highly sensitive, low-cost
and simple fabrication/handling.

29. Best choices
Thinner, narrower, numerous traces.
Higher frequency.
Spiral-like configuration.

30. Interpretation
The physical origin of the detection is the
induction of emf in the copper/any conductor.

31. Challenges
Yes, we can detect just with copper.
Widening applications?

32. Thanks for your attention
Questions are
wellcome
rivas@uniovi.es