Abstract
In this paper, graphene-coated black phosphorus at the metal surface for the detection of DNA hybridization event is numerically demonstrated. The strategy consists of placing the sensing medium on top of black phosphorus–graphene-coated SPR which interfaces with phosphate-buffered saline solution carrying single-stranded DNA. Upon hybridization with its complementary DNA, desorption of the nanostructures takes place and thus enables the sensitive detection of the DNA hybridization event. The proposed sensor exhibits a sensitivity (125 ο/RIU), detection accuracy (0.95) and quality factor (13.62 RIU−1) for complementary DNA. In comparison with other reported papers, our suggested sensor provides much better performance. Thus, this label-free DNA detection platform should spur off new interest towards the use of black phosphorus–graphene-coated SPR interfaces.
Abbreviations
- A:
-
Adenine
- ATR:
-
Attenuated total reflection
- BP:
-
Black phosphorus
- C:
-
Cytocine
- c a :
-
Concentration of adsorbed molecule
- DNA:
-
Deoxyribonucleic acid
- DA:
-
Detection accuracy
- dsDNA:
-
Double-stranded DNA
- FWHM:
-
Full width at half maximum
- Au:
-
Gold
- G:
-
Guanine
- MoS2 :
-
Molybdenum disulfide
- MoSe2 :
-
Molybdenum diselenide
- nM:
-
Nanomolar
- λ :
-
Operating wavelength
- PBS:
-
Phosphate-buffered saline
- Q.F:
-
Quality factor
- R:
-
Reflectance
- RI:
-
Refractive index
- RIU:
-
Refractive index unit
- n S :
-
RI of sensing medium before hybridization
- n H :
-
RI of sensing medium after DNA hybridization
- Adsorbate:
-
RI change due to DNA
- S:
-
Sensitivity
- ssDNA:
-
Single-stranded DNA
- SPR:
-
Surface plasmon resonance
- SPW:
-
Surface plasmon wave
- TMDC:
-
Transition metal dichalcogenides
- T:
-
Thymine
- TM:
-
Transverse magnetic
- WS2 :
-
Tungsten disulfide
- WSe2 :
-
Tungsten diselenide
- k spw :
-
Wave vector of evanescent wave
- k ev :
-
Wave vector of surface plasmon wave
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Acknowledgements
This work is partially supported under Project no. 34/14/10/2017-BRNS/34285 by Board of Research in Nuclear Sciences (BRNS), Department of Atomic Energy (DAE), Government of India.
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Pal, S., Verma, A., Raikwar, S. et al. Detection of DNA hybridization using graphene-coated black phosphorus surface plasmon resonance sensor. Appl. Phys. A 124, 394 (2018). https://doi.org/10.1007/s00339-018-1804-1
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DOI: https://doi.org/10.1007/s00339-018-1804-1