Semi-wrapped gold nanoparticles for surface-enhanced Raman scattering detection

拉曼散射 纳米颗粒 胶体金 普鲁士蓝 材料科学 纳米技术 基质(水族馆) 拉曼光谱 检出限 校准 化学 光学 色谱法 电化学 电极 物理 物理化学 地质学 海洋学 统计 数学
作者
Ting Wang,Bing Ji,Zehua Cheng,Ling Chen,Mai Luo,Jinchao Wei,Yuefei Wang,Liang Zou,Yuanzhe Liang,Bingpu Zhou,Peng Li
出处
期刊:Biosensors and Bioelectronics [Elsevier BV]
卷期号:228: 115191-115191 被引量:7
标识
DOI:10.1016/j.bios.2023.115191
摘要

Researchers have struggled to develop highly reliable and sensitive surface-enhanced Raman scattering (SERS) substrates for detecting compounds in complicated systems. In this work, a strategy by constructing Au cores with incompletely wrapped Prussian blue (PB) for highly reliable and sensitive SERS substrate is proposed. The wrapped PB layers can provide the internal standard (IS) to calibrate the SERS signal floatation, whereas the exposed surface of Au cores offers the enhancement effect. The balance between the signal self-calibration and enhancement (hence the trade-off between SERS reliability and sensitivity) is obtained by the approximate semi-wrapping configuration of PB layers on Au cores (i.e., SW-Au@PB). The proposed SW-Au@PB nanoparticles (NPs) exhibit the similar enhancement factor as the pristine Au NPs and contribute to the ultralow RSD (8.55%) of calibrated SERS signals using R6G as probe molecules. The simultaneously realized reliability and sensitivity of SW-Au@PB NPs also enables the detection of hazardous pesticide residues such as paraquat and thiram in herbal plants, with the average detection accuracy up to 92%. Overall, this work mainly provides a controllable synthetic strategy for incompletely wrapped NPs, and most importantly, explores the potential with a proof-of-concept practical application in accurate and sensitive Raman detection of hazardous substances with varying solubility.
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