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首页> 外文期刊>Carbon: An International Journal Sponsored by the American Carbon Society >Microano-structured graphitic carbon nitride-Ag nanoparticle hybrids as surface-enhanced Raman scattering substrates with much improved long-term stability
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Microano-structured graphitic carbon nitride-Ag nanoparticle hybrids as surface-enhanced Raman scattering substrates with much improved long-term stability

机译：微米/纳米结构的石墨氮化碳-Ag纳米颗粒杂化物作为表面增强的拉曼散射基质，具有长期稳定的改善

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摘要

Surface-enhanced Raman scattering (SERS) substrates with high SEAS activity and stability are important for SERS sensors. A facile method was developed to fabricate efficient and stable SERS substrates by combining Ag nanoparticles (NPs) and micro-scale sheeted graphitic carbon nitride (g-C3N4). The g-C3N4/Ag NPs hybrid could provide a great number of hot spots and concentrated the analyte by the pi-pi stacking interaction between analyte molecules and g-C3N4, making a dramatic Raman enhancement. Moreover, the g-C3N4/Ag NPs hybrid uniformly immobilized Ag NPs on the surface and edges of g-C3N4 sheets by an interaction between Ag NPs and g-C3N4, leading to much improved long-term stability. This could be explained in terms of the electron-donor effect of g-C3N4, which was further confirmed by density functional theory calculations. The inherent Raman enhancing effect of g-C3N4 itself also contributed to the total SERS responses. Due to multiple enhancement contributions, the g-C3N4/Ag NPs hybrid exhibited a strong Raman enhancement effect for with an enhancement factor of 4.6 x 10(8) (evaluated by using crystal violet as a probe), and possessed wide adaptability from dyes, pesticides to bio-molecules. (C) 2015 Elsevier Ltd. All rights reserved.
机译：具有高SEAS活性和稳定性的表面增强拉曼散射（SERS）基板对于SERS传感器非常重要。通过组合银纳米颗粒（NP）和微米级片状石墨碳氮化物（g-C3N4），开发了一种简便有效的方法来制造高效稳定的SERS基板。 g-C3N4 / Ag NPs杂化物可以提供大量的热点，并通过分析物分子与g-C3N4之间的pi-pi堆积相互作用浓缩分析物，从而显着提高拉曼光谱。此外，g-C3N4 / Ag NPs通过Ag NPs与g-C3N4之间的相互作用将Ag NPs均匀地固定在g-C3N4薄片的表面和边缘上，从而大大提高了长期稳定性。这可以用g-C3N4的电子给体效应来解释，这通过密度泛函理论计算得到了进一步证实。 g-C3N4本身固有的拉曼增强作用也有助于总SERS反应。由于有多种增强作用，g-​​C3N4 / Ag NPs杂种表现出强大的拉曼增强作用，增强因子为4.6 x 10（8）（通过使用结晶紫作为探针进行评估），并且对染料具有广泛的适应性，农药成为生物分子。 （C）2015 Elsevier Ltd.保留所有权利。

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