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Highly Sensitive and Stable SERS Substrate Fabricated by Co-sputtering and Atomic Layer Deposition.
Guilin Yin1,2, Shiheng Bai1,2, Xinglong Tu1
1School of Material Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai, 200240, People's Republic of China.
We developed a highly sensitive and stable surface-enhanced Raman scattering (SERS) substrate using co-sputtering and atomic layer deposition. This novel SERS substrate demonstrates excellent performance for glycerin detection and long-term stability.
Area of Science:
- Materials Science
- Nanotechnology
- Spectroscopy
Background:
- Surface-enhanced Raman scattering (SERS) requires substrates with high sensitivity and stability.
- Existing SERS substrates often face challenges with degradation and limited detection capabilities.
Purpose of the Study:
- To develop a facile method for fabricating highly sensitive and stable SERS substrates.
- To investigate the enhancement mechanisms and stability of the fabricated SERS substrate.
- To explore the potential applications in detecting liquid lubricating materials.
Main Methods:
- Fabrication of SERS substrates by combining co-sputtering (Ag and Al) with atomic layer deposition (ALD) of TiO2.
- Utilizing discontinuous Ag film as the SERS active moiety.
- Characterization of substrate performance in glycerin detection and stability tests.
Main Results:
- The fabricated SERS substrate exhibited high sensitivity in glycerin detection.
- The TiO2 coating enhanced Raman signal through chemical and long-range electromagnetic effects.
- The substrate maintained significant enhancement for over 30 days in air due to TiO2 protection against Ag NP oxidation.
Conclusions:
- A facile and effective method for creating stable and sensitive SERS substrates was established.
- The TiO2 layer significantly improves the stability of Ag nanoparticles against oxidation.
- This SERS substrate shows promise for interface state investigations and the development of novel liquid lubricating materials.
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