Abstract
To obtain more information and reduce false alarms during molecular identification, the Molybdenum disulfide (MoS2) spaced gold (Au)-silver (Ag) bimetal composite structure for surface-enhanced Raman scattering (SERS)-surface plasmon resonance (SPR) sensor is proposed. The sensor combines the advantages of D-shape plastic optical fiber (D-POF), MoS2-spaced Au and Ag bimetallic composite structure, showing excellent sensitivity. Compared with the Ag/Au bimetallic D-POF experiment (the sensitivity is 2163.57 nm/RIU), the sensitivity of proposed sensor was improved effectively and calculated as 2473.37 nm/RIU in a range of alcohol solution. To evaluate the SERS activity of the proposed sensor, Rhodamine 6 G (R6G) molecules has been successfully detected by Au/MoS2/Ag D-POF sensor with low limited of detection (LOD) of 10−9 M. Meanwhile, the proposed sensor successfully detected glucose with a concentration of 0.625~20% by observing the change of resonance wavelength and the characteristic peak of SERS signal. The highly sensitive spectral signals, richer and more comprehensive information can be obtained to reduce false positives in identification of biomolecules.
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