研究目的
To fabricate and characterize an ordered array of Ag particles on Ag semishells separated by an ultrathin oxide layer for enhanced SERS properties.
研究成果
The PoSS array structure, fabricated using a facile method combining nanosphere self-assembly, ALD, and dewetting, provides a significant increase in SERS enhancement (up to 10 times that of conventional semishell arrays) due to additional hot spots in valley regions. This structure shows promise for applications in chemical sensing, biosensing, and solar energy conversion, with good reproducibility and tunability.
研究不足
The SERS enhancement factor achieved (up to ~2.5 × 10^6) is not the highest compared to other methods (e.g., up to 10^9 with solution synthesis), and the fabrication may have issues with reproducibility and scalability for industrial applications. The use of Ag makes the structures prone to oxidation, requiring fresh samples for measurements.
1：Experimental Design and Method Selection:
The fabrication process involves nanosphere self-assembly, atomic layer deposition (ALD), and metal thin-film dewetting to create a particle-on-semishell (PoSS) array structure. Numerical simulations using finite-difference time-domain (FDTD) methods were employed to model electromagnetic field distributions.
2：Sample Selection and Data Sources:
Polystyrene (PS) nanospheres with a size of 505 ± 10 nm were used as templates. Samples were prepared on substrates with Ag and TiO2 layers.
3：List of Experimental Equipment and Materials:
Equipment includes an Edward electron-beam evaporation system, Beneq TFS-200 ALD system, JEOL JSM-6700F FE-SEM, Zolix Solar Cell QE/IPCE measurement system, Renishaw Raman Imaging Microscope, and JEOL JFC-1600 sputter coater. Materials include Ag, TiO2, PS nanospheres, and R6G probe molecules.
4：Experimental Procedures and Operational Workflow:
Steps include deposition of Ag on TiO2 hollow sphere arrays, ALD of TiO2, sputtering of Ag thin film, thermal annealing to induce dewetting, and characterization via SEM, diffuse reflectance, and SERS measurements.
5：Data Analysis Methods:
SERS enhancement factors were calculated using standard formulas, and field distributions were simulated with FDTD software.
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