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Efficient surface enhanced Raman scattering on confeito-like gold nanoparticle-adsorbed self-assembled monolayers
Chia-Chi Chang1, Toyoko Imae2, Liang-Yih Chen1
1Department of Chemical Engineering, National Taiwan University of Science and Technology, 43 Section 4, Keelung Road, Taipei 10607, Taiwan, Republic of China. imae@mail.ntust.edu.tw sampraslyc@gmail.com.
Confeito-like gold nanoparticles on self-assembled monolayers create highly sensitive surfaces for ultrasensitive analyses. The hierarchical substrate demonstrated a significantly higher surface-enhanced Raman scattering effect, showing great potential for molecular electronics.
Area of Science:
- Nanotechnology
- Surface Chemistry
- Spectroscopy
Background:
- Self-assembled monolayers (SAMs) are crucial for surface functionalization.
- Gold nanoparticles (AuNPs) exhibit unique optical properties for sensing applications.
- Surface-enhanced Raman scattering (SERS) offers high sensitivity for molecular detection.
Purpose of the Study:
- To investigate the SERS activity of confeito-like AuNPs on different SAM substrates.
- To compare the SERS enhancement factors between APTES-SAM and DEN/PS-SAM.
- To explore the potential of these substrates for molecular electronic devices and ultrasensitive analyses.
Main Methods:
- Fabrication of two SAMs: 3-aminopropyltriethoxysilane (APTES-SAM) and amine-terminated poly(amido amine) dendrimers on polystyrene spheres (DEN/PS-SAM).
- Adsorption of confeito-like gold nanoparticles (AuNPs) onto the SAMs via immersion-adsorption.
- Measurement of SERS using rhodamine 6G (R6G) as a probe molecule.
- Analysis of R6G concentration dependence on SERS signal.
Main Results:
- Strong SERS intensification was observed on both AuNP/APTES-SAM and AuNP/DEN/PS-SAM substrates.
- The AuNP/DEN/PS-SAM substrate exhibited a 5-10 times higher enhancement factor (>10,000) compared to AuNP/APTES-SAM.
- High surface area and hot spots on the hierarchical substrate contributed to the enhanced SERS effect.
- The enhancement mechanism effectively excited R6G molecules in the first layer on hot spots.
Conclusions:
- Confeito-like AuNPs on SAM substrates demonstrate significant SERS activity.
- The hierarchical AuNP/DEN/PS-SAM substrate shows superior SERS performance.
- These findings highlight the potential of AuNP-based SAMs for advanced applications in molecular electronics and ultrasensitive chemical analysis.
