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Plasmon Coupling and Efficient Charge Transfer in Rough-Surfaced Au Nanotriangles/MXene Hybrids as an Ultrasensitive
Shu-Zhou Qu1, Yi-Xin Zhao1, Hao-Sen Kang1
1Hubei Key Laboratory of Optical Information and Pattern Recognition, Wuhan Institute of Technology, Wuhan 430205, P. R. China.
ACS Omega
|January 2, 2023
Summary
This study developed a novel surface-enhanced Raman scattering (SERS) substrate using ultrathin MXene and rough gold nanotriangles for sensitive organic molecule detection. The hybrid material significantly enhances electromagnetic fields and charge transfer for improved SERS performance.
Area of Science:
- Materials Science
- Nanotechnology
- Spectroscopy
Background:
- Surface-enhanced Raman scattering (SERS) requires substrates with strong electromagnetic enhancement and charge transfer capabilities.
- Designing efficient SERS substrates is crucial for sensitive detection of organic molecules.
- Two-dimensional materials like MXene offer unique properties for advanced applications.
Purpose of the Study:
- To develop a high-performance SERS substrate by combining ultrathin Ti3C2Tx MXene with rough-surfaced gold nanotriangles (NTs).
- To investigate the synergistic effects of optimized electromagnetic fields and charge transfer on SERS performance.
- To achieve highly sensitive detection of organic molecules using the novel hybrid substrate.
Main Methods:
- Fabrication of uniform gold nanotriangles (NTs) with tunable surface roughness.
- Preparation of Ti3C2Tx MXene.
- Integration of rough-surfaced Au NTs with Ti3C2Tx MXene to form hybrid SERS substrates.
- Characterization of SERS performance using crystal violet as a target molecule at 785 nm excitation.
Main Results:
- Modified Au NTs exhibited enhanced SERS performance compared to initial Au NTs due to increased surface area and plasmon resonance.
- The Ti3C2Tx/Au NT hybrids demonstrated significantly improved SERS activity over bare Au NTs and rough-surfaced Au NTs.
- Achieved a detection limit as low as 10^-12 M for crystal violet with an analytical enhancement factor of 3.6 × 10^9.
- Observed strong plasmon coupling and efficient charge transfer contributing to the enhanced SERS signals.
Conclusions:
- The developed Ti3C2Tx/Au NT hybrid material represents a highly efficient SERS substrate.
- Synergistic effects between MXene and gold nanostructures optimize electromagnetic fields and charge transfer for superior SERS detection.
- This work offers a new strategy for designing advanced plasmon-based SERS substrates.
