Plasmonic hybrid core-shell (HyCoS) AgPt NP template hybridized with GQDs for SERS enhancement of 4-MBA and BT

Technical Report · Wed Apr 12 04:00:00 EDT 2023

DOI:https://doi.org/10.2172/2386900· OSTI ID:2386900

Lin, Shusen ^[1]; Habib, Md Ahasan ^[1]; Burse, Shalmali ^[1]; Mandavkar, Rutuja ^[1]; Joni, Mehedi Hasan ^[1]; Kunwar, Sundar ^[2]; Lee, Jihoon ^[1]

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1. Kwangwoon Univ., Seoul (Korea, Republic of)
2. Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Kwangwoon Univ., Seoul (Korea, Republic of)

Surface-enhanced Raman spectroscopy (SERS) is an attractive vibrational spectroscopic technique that can enable a non-destructive and ultra-sensitive detection down to the single-molecule level. Herein, a novel hybrid SERS platform is developed based on hybrid core-shell (HyCoS) AgPt nanoparticles (NPs) and graphene quantum dots (GQDs) for the enhancement of Raman vibration of 4-mercaptobenzoic acid (4-MBA) and benzenethiol (BT). The unique design of HyCoS AgPt NPs induces strong electromagnetic mechanism (EM) enhancement through the amplification of electromagnetic fields by the excitation of high-density surface plasmons and hot spots. Superior localized surface plasmon resonance (LSPR) is generated by the AgPt core-shell and background Ag NP coupling, which is systematically investigated by the optical properties and FDTD simulations. The background Ag NPs can further increase the coverage of metallic NPs, leading to higher-density hot spots and enhanced SERS response. At the same time, GQDs can provide plentiful accessible edges for the charge transfer to the HOMO and LUMO of 4-MBA and BT based on the chemical mechanism (CM) enhancement. The mixing approach of GQDs and target molecules on the HyCoS AgPt NPs can significantly amplify the Raman signals via the strong adsorption of probe molecules by the π–π interaction. The enhancement factors of proposed SERS platform can reach ~10⁷ and ~10⁵ for the 4-MBA and BT respectively.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA); National Research Foundation of Korea (NRF); USDOE Laboratory Directed Research and Development (LDRD) Program
• DOE Contract Number: 89233218CNA000001
• OSTI ID: 2386900
• Report Number(s): LA-UR--23-23895
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
GQDs
HyCoS AgPt NPs
chemical mechanism (CM)
electromagnetic mechanism (EM)
localized surface plasmon resonance (LSPR)