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Using Si/MoS₂ Core-Shell Nanopillar Arrays Enhances SERS Signal.

Tsung-Shine Ko¹, Han-Yuan Liu¹, Jiann Shieh²

¹Department of Electronic Engineering, National Changhua University of Education, No. 2, Shi-Da Road, Changhua 50074, Taiwan.

Nanomaterials (Basel, Switzerland)

|April 3, 2021

Summary

Researchers developed novel silicon/molybdenum disulfide (Si/MoS₂) core/shell nanopillar arrays for enhanced surface-enhanced Raman scattering (SERS). These nanostructures significantly boost SERS signal intensity for detecting organic molecules like Rhodamine 6G.

Keywords:

2D material MoS2 SERS Si nanopillar charge transfer core-shell

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Area of Science:

Materials Science
Nanotechnology
Spectroscopy

Background:

Molybdenum disulfide (MoS₂), a 2D layered material, has potential as a surface-enhanced Raman scattering (SERS) substrate due to its flat surface.
Low detection efficiency necessitates nanostructure fabrication for enhanced SERS performance of MoS₂.

Purpose of the Study:

To fabricate and characterize period-distribution Si/MoS₂ core/shell nanopillar (NP) arrays for SERS applications.
To evaluate the SERS performance of these novel nanostructures for organic molecule detection.

Main Methods:

Fabrication of Si/MoS₂ core-shell NP arrays via sulfurization of MoO₃ on Si NP arrays.
Characterization using scanning electron microscopy (SEM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS).
Assessment of SERS enhancement for Rhodamine 6G (R6G) molecules.

Main Results:

Si/MoS₂ core-shell NP arrays demonstrated significantly enhanced SERS signal intensity compared to bare Si and MoS₂ thin films.
Specific peak signal enhancements of approximately 75-fold and 7-fold were observed at 1361 cm^-1 for R6G.
The larger surface area of the NP arrays facilitates increased molecule absorption and interaction.

Conclusions:

Si/MoS₂ core-shell NP arrays are effective SERS substrates with enhanced signal detection capabilities.
The nanostructure design promotes charge transfer and exciton transitions, leading to improved SERS performance.
These arrays show promise for applications in sensitive biomedical detection.