Highly active SERS chip with both structure-ameliorated chemical enhancement and nanocavity-mediated electromagnetic enhancement

纳米花 材料科学 拉曼光谱 纳米技术 石墨烯 聚二甲基硅氧烷 纳米复合材料 光电子学 纳米结构 光学 物理
作者
Rongyan Wang,Jiali Ma,Xing Dai,Yixiao Gao,Chenjie Gu,Tao Jiang
出处
期刊:Sensors and Actuators B-chemical [Elsevier BV]
卷期号:374: 132782-132782 被引量:38
标识
DOI:10.1016/j.snb.2022.132782
摘要

An essential aspect for the wide practical application of surface-enhanced Raman spectroscopy (SERS) lies in the further improvement of its sensitivity. In this paper, a strengthened chemical effect with a high enhancement factor (EF) of 3.9 × 107 was first triggered through simply adjusting the heterojunction structure between graphitic carbon nitride (g-C3N4) flake and molybdenum disulfide (MoS2) nanoflower. Ag nanoparticles (Ag NPs) were then photo-reduced onto the g-C3N4 @MoS2 matrix to introduce significant steric electromagnetic field under excitation, which was further reinforced by provoking a resonance coupling effect based on graphene oxide (GO) resonant cavity. Such a cavity was set between the g-C3N4 @MoS2 @Ag-polydimethylsiloxane (PDMS) matrix and the Ag nanocubes (Ag NCs)-embedded PDMS coating membrane, facilitating a robust flexible SERS chip with a promising EF attained as 1.1 × 109. Additionally, the SERS intensity was only decreased by 5% after three months, indicating the excellent stability of the as-prepared bilayer SERS chip. The on-site reclaimable monitoring for thiram (TMTD) and methyl parathion (MP) accompanied by a low limit of detection (LOD) of 10−6 mg/mL was achieved by utilizing the proposed sophisticated SERS chip, demonstrating its fascinating application feasibility.
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