研究目的
To propose a TMDCs-mediated long range surface plasmon resonance (LRSPR) imaging biosensor that shows improvements in imaging sensitivity and detection accuracy compared to conventional surface plasmon resonance (cSPR) biosensor.
研究成果
The proposed TMDCs-mediated LRSPR imaging biosensor shows significant improvements in imaging sensitivity and detection accuracy compared to conventional SPR biosensors. The integration of TMDC layers enhances the sensor's performance, which is tunable by varying the number of layers, Au film thickness, cytop thickness, and analyte refractive index. This design offers potential applications in chemical sensing and biosensing.
研究不足
The study focuses on bulk RI variations and sensitivities, and does not discuss surface RI sensitivity. The integration of TMDC layers, while improving imaging sensitivity in some configurations, can degrade detection accuracy due to increased damping of surface plasmon oscillations.
1：Experimental Design and Method Selection:
The study employs a generalized N-layer model to calculate the reflectance of a prism-coupled SPR sensor for p-polarized incident light. The methodology involves tuning the thickness of gold film and cytop layer to optimize imaging sensitivity for LRSPR sensor with integrated TMDC layers.
2：Sample Selection and Data Sources:
The study focuses on four TMDC materials: MoS2, MoSe2, WS2, and WSe2, with their complex refractive indices at a wavelength of 633 nm.
3：List of Experimental Equipment and Materials:
The sensor configuration includes a 2S2G glass prism, cytop layer, Au thin film, and TMDC layers. The wavelength-dependent refractive index of the 2S2G prism and the RI of Au film are specified.
4：Experimental Procedures and Operational Workflow:
The study involves comparing the sensor performance of bare Au-based cSPR and LRSPR biosensors, and then integrating 2D materials (graphene and TMDCs) to evaluate their effects on imaging sensitivity and detection accuracy.
5：Data Analysis Methods:
The imaging sensitivity and detection accuracy are calculated based on the reflectance-angle curve and the full width at half maximum (FWHM) of the SPR curve, respectively.
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