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首页> 外文期刊>RSC Advances >Interfacial effect of dual ultra-thin SiO2 core-triple shell Au@SiO2@Ag@SiO2 for ultra-sensitive trinitrotoluene (TNT) detection
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Interfacial effect of dual ultra-thin SiO2 core-triple shell Au@SiO2@Ag@SiO2 for ultra-sensitive trinitrotoluene (TNT) detection

机译：双超薄SiO2核心三重壳体Au @ SiO2 @ Ag @SAG @ SiO2的界面效应，用于超敏感三硝基甲苯（TNT）检测

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摘要

Nanostructured hybrid Au@SiO2@Ag@SiO2 was developed, which greatly enhanced the surface plasmon resonance effect due to the interfacial effect of dual ultra-thin SiO2 in which the double-superimposed long-range plasmon transfer between Au and Ag and determinand molecules. In addition, the interfacial effect between the inner and outermost silica layer can contribute to the presence of an amplified electric field between Au core and Ag shell, which prevents aggregation and oxidation of nanoparticles. At the same time, the influence of the amount of silica in SiO2 shells on the Surface Enhanced Raman Scattering (SERS) was explored by controlling the experimental conditions. In our experiments, the ultrathin silica coating Au@SiO2@Ag@SiO2 showed the best SERS performance, generating an analytical enhancement factor (AEF) of 5 x 10(6). At the same time, nanoparticles modified by 4-aminothiophenol (4-ATP) can detect 2,4,6-TNT as low as 2.27 x 10(-6) ppb (10(-14) M) and exhibit excellent versatility in the detection of nitroaromatics. The results demonstrated that the interfacial effect of double-layer dielectric silica achieved the localized surface plasmon resonance enhancement effect in Au@SiO2@Ag@SiO2.
机译：开发了纳米结构杂交AU @ SiO2 @ Ag @ SiO2，这极大地增强了表面等离子体共振效果，因为双超薄SiO2的界面效应，其中Au和Ag和算法之间的双叠加的远程等离子体转移。另外，内和最外层二氧化硅层之间的界面效应可以有助于存在Au核和Ag壳之间的扩增电场，这防止了纳米颗粒的聚集和氧化。同时，通过控制实验条件，探讨了在表面增强拉曼散射（SERS）上的SiO2壳中二氧化硅的量的影响。在我们的实验中，超薄二氧化硅涂料Au @ SiO2 @ Ag @SiO2显示了最佳的SERS性能，产生了5×10（6）的分析增强因子（AEF）。同时，由4-氨基噻吩醇（4-ATP）改性的纳米颗粒可以检测2,4,6-TNT，低至2.27×10（-6）ppb（10（-14）m），并且在此方面表现出优异的多功能性硝基甲族的检测。结果表明，双层电介质二氧化硅的界面效应在Au @ SiO2 @ Ag @ SiO2中实现了局部表面等离子体共振增强效果。

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  • 来源
    《RSC Advances》 |2020年第7期|共6页
  • 作者

    Lu Bingxin; Qi Qi; Wang Yang; Chang Huaiqiu; Zhai Jin; You Tingting;

  • 作者单位

    Beihang Univ Sch Chem Minist Educ Key Lab Bioinspired Smart Interfacial Sci &

    Techn Beijing Peoples R China;

    Beihang Univ Sch Chem Minist Educ Key Lab Bioinspired Smart Interfacial Sci &

    Techn Beijing Peoples R China;

    Chinese Acad Sci Inst Chem Beijing Peoples R China;

    Natl Ctr Nanosci &

    Technol Beijing Peoples R China;

    Beihang Univ Sch Chem Minist Educ Key Lab Bioinspired Smart Interfacial Sci &

    Techn Beijing Peoples R China;

    Beihang Univ Sch Chem Minist Educ Key Lab Bioinspired Smart Interfacial Sci &

    Techn Beijing Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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