研究目的
Investigating the enhancement of Raman signal via hybrid optical properties of MDPC core-shell structure design for ultrasensitive molecular detection.
研究成果
Stable hybrid properties PBG and LSPR were developed through combination of polymer and metal nanoparticles in core-shell structure called MDPCs SERS substrate. The investigation shows both the PMMA@Au and PMMA@Ag MDPC substrate were excellently performed by exhibiting the dominant fingerprint peaks of the detecting molecules compared with weak normal Raman. The optimization was obtained at three layers of PMMA@Au MDPC substrate.
研究不足
The study noted that the increase in thickening of PMMA@Au MDPC substrate might block light penetration, leading to weak Raman signal received. Additionally, the absorption of probe molecules into particle gap between PMMA@Au particles could cause poor number of molecules to detect on the surface.
1：Experimental Design and Method Selection:
The study proposed a feasible method to enhance Raman signal via hybrid optical properties of MDPC core-shell structure design. Poly(methyl methacrylate)@gold core-shell (PMMA@Au CS) and poly(methyl methacrylate)@silver core-shell (PMMA@Ag CS) were prepared as MDPC materials.
2：Sample Selection and Data Sources:
PMMA spheres with an average size of 419 nm and
3：07 polydispersity index were selected for this work. List of Experimental Equipment and Materials:
Materials included poly(sodium-4–styrenesulfonate) (PSSS), polyethylene imine (PEI), gold (III) chloride trihydrate (HAuCl4), silver nitrate (AgNO3), tri–sodium citrate (TSC), sodium borohydrate (NaBH4), hydrogen peroxide (H2O2), and ammonia hydroxide (NH3OH). Equipment included scanning electron microscopy (SEM, JEOL model 6360F), UV-visible spectroscopy (UV-Vis, Shimadzu, Japan), electron dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD, Rigaku), and InVia Renishaw Raman microscope.
4：Experimental Procedures and Operational Workflow:
The MDPC thin film was fabricated via 'bottom-up' technique, leading to the formation of highly ordered face-centred cubic (FCC) lattice arrangement. Optical properties were obtained using UV-visible spectroscopy.
5：Data Analysis Methods:
The performance of surface active Raman substrate was investigated using Raman spectroscopy with argon ion laser of 514 nm.
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