机制(生物学)
材料科学
化学工程
纳米技术
认识论
工程类
哲学
作者
Rutuja Mandavkar,Shusen Lin,Sanchaya Pandit,Rakesh Kulkarni,Shalmali Burse,Md Ahasan Habib,Sundar Kunwar,Jihoon Lee
标识
DOI:10.1016/j.surfin.2022.102175
摘要
Surface-enhanced Raman spectroscopy (SERS) is a versatile analytical technique widely adapted for the identification of target analytes even at an extremely low concentration. Herein, a unique hybrid SERS platform is demonstrated by utilizing the graphene quantum dots (GQDs) and hybrid PdAg NPs for the detection of 4-amino-thiophenol (4-ATP) and crystal violet (CV). GQDs offer the rich charge transfer to the LUMO and HOMO of 4-ATP and CV by the CM enhancement. A significant EM enhancement is achieved by the strong localized surface plasmon resonance (LSPR) of uniquely designed hybrid core-shell PdAg NP, possessing the narrow nano-gaps with the highly dense small Ag NPs and Pd core Ag shell configuration. As a result, orders of enhancement of originally weak 4-ATP and CV Raman signal is witnessed by the combination of electromagnetic mechanism (EM) and chemical mechanism (CM) enhancements on a single SERS substrate. The hybrid GQD/HNP SERS substrate demonstrates significantly improved hot spots and strongly localized electromagnetic fields as confirmed by the finite-difference time-domain (FDTD) simulations. A proper mixture ratio of GQDs and probe molecules presents largely enhanced SERS signals by a strong adsorption of probe molecules through π - π interaction and the enhancement factors vary by the mixture ratio depending on the adsorption kinetics and Raman cross-section of molecules. An innovative SERS platform is demonstrated for the detection of 4-amino-thiophenol (4-ATP) and crystal violet (CV) by the utilization of the graphene quantum dots (GQDs) and hybrid PdAg NPs through the combination of both the EM and CM enhancements.
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