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Au nanoparticles functionalized 3D-MoS2 nanoflower: An efficient SERS matrix for biomolecule sensing.
Shib Shankar Singha1, Suchanda Mondal2, Tara Shankar Bhattacharya3
1Department of Physics, Bose Institute, 93/1, Acharya Prafulla Chandra Road, Kolkata 700009, India; Department of Physics, Brahmananda Keshab Chandra College, 111/2 B. T. Road, Bonhooghly, Kolkata 700108, India.
Biosensors & Bioelectronics
|August 12, 2018
Summary
Gold nanoparticles on Molybdenum disulfide nanoflowers create a sensitive biosensor. This gold-Molybdenum disulfide hybrid structure efficiently detects bilirubin in blood, showing high sensitivity and selectivity for potential clinical diagnosis.
Area of Science:
- Nanomaterials Science
- Biotechnology
- Chemical Sensing
Background:
- Molybdenum disulfide (MoS2) nanostructures and noble metal nanoparticle functionalization are key for advanced electronic and chemical sensing applications.
- Developing efficient biosensors requires tailoring nanomaterial properties for biological interactions.
- Surface-enhanced Raman scattering (SERS) offers high sensitivity for detecting biomolecules.
Purpose of the Study:
- To fabricate and characterize gold nanoparticle-decorated Molybdenum disulfide nanoflowers (Au-MoS2 NFs) as an efficient biosensor.
- To investigate the potential of Au-MoS2 NFs as a substrate for surface-enhanced Raman scattering (SERS) based biochemical sensing.
- To demonstrate the application of this hybrid nanomaterial for sensitive and selective detection of free bilirubin.
Main Methods:
- Green synthesis of MoS2 nanoflowers (NFs).
- Functionalization of MoS2 NFs with gold nanoparticles (AuNPs).
- Characterization of the Au-MoS2 NFs hybrid structure.
- Evaluation of SERS performance using Rhodamine 6G (Rh6G) as a probe molecule.
- Detection of free bilirubin in various concentrations and in human serum using SERS.
Main Results:
- Au-MoS2 NFs were successfully synthesized and functionalized, creating 'hot-spots' for enhanced electromagnetic field localization.
- The SERS substrate demonstrated high sensitivity, detecting Rh6G down to 10^-12 M.
- The biosensor exhibited high sensitivity, stability, and reproducibility in detecting free bilirubin from 10^-3 M to picomolar levels.
- The concentration-dependent SERS intensity followed the relationship I = C^α, with α ranging from 0.09 to 0.12.
- Excellent selectivity and reliability were observed for bilirubin detection in human serum, even with interfering substances.
Conclusions:
- Au-MoS2 NFs serve as an excellent SERS substrate for highly sensitive and selective biochemical sensing.
- This hybrid nanomaterial offers a promising new technology for the detection of free bilirubin.
- The developed biosensor has significant potential for application in clinical diagnostics.
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