10:15 AM - 10:30 AM
▼ [20a-C304-4] Facile fabrication of Aluminum-black silicon nano-eggs structure over large area for deep-UV surface-enhanced resonance Raman spectroscopy
Keywords:Resonance Raman spectroscopy, Nanofabrication, Plasmonic nanostructure
Surface-enhanced Raman spectroscopy (SERS) is a powerful technique for achieving label-free, in-situ molecule detection with high sensitivity. In SERS, the Raman scattering of molecules is amplified several orders of magnitude through an enhanced electric field generated by the localized surface plasmonic resonance at metal surfaces. The metallic plasmonic structure for SERS in the VIS/near-IR region has been extensively investigated, while there is a high overlap between the detection region and the fluorescence region of probing molecules. Extending the SERS measurement to the deep-UV region has attracted lots of interest due to the possibility of measuring the Raman scattering free of fluorescence contribution. Furthermore, the occurrence of resonance between incident photon energy and the electronic transition of the molecule in the deep-UV region will contribute to the enhancement of the Raman signal, known as the Resonance Raman effect. Combining SERS with the resonance Raman effect, Surface-enhanced resonance Raman spectroscopy (SERRS) has been proven to achieve the enhancement of the Raman signal about 10^8. However, most plasmonic nanostructures reported for UV SERRS were fabricated using high-cost technologies and/or fabricated using complex processes.
Here, we propose a nano-eggs structure consisting of Al nanoparticles on black Si (BSi) for deep-UV SERRS. The Al/BSi nano-eggs structure can be fabricated over large areas using simple techniques. Our experiment demonstrated that the fabricated structures are able to detect adenine molecules at a concentration as low as 10^-5 M on a home-built deep-UV SERRS setup. Furthermore, there was no significant difference in enhancement between a nano-eggs structure with Al deposition thickness from 300 to 900 nm. The low-cost and easy-to-fabricate features of the Al/BSi nano-eggs structure allow the fabrication process to become more flexible and it will thus benefit practical applications of the deep-UV SERS.
Here, we propose a nano-eggs structure consisting of Al nanoparticles on black Si (BSi) for deep-UV SERRS. The Al/BSi nano-eggs structure can be fabricated over large areas using simple techniques. Our experiment demonstrated that the fabricated structures are able to detect adenine molecules at a concentration as low as 10^-5 M on a home-built deep-UV SERRS setup. Furthermore, there was no significant difference in enhancement between a nano-eggs structure with Al deposition thickness from 300 to 900 nm. The low-cost and easy-to-fabricate features of the Al/BSi nano-eggs structure allow the fabrication process to become more flexible and it will thus benefit practical applications of the deep-UV SERS.