Issue 7, 2020, Issue in Progress

Interfacial effect of dual ultra-thin SiO2 core–triple shell Au@SiO2@Ag@SiO2 for ultra-sensitive trinitrotoluene (TNT) detection

Abstract

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 × 106. At the same time, nanoparticles modified by 4-aminothiophenol (4-ATP) can detect 2,4,6-TNT as low as 2.27 × 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.

Graphical abstract: Interfacial effect of dual ultra-thin SiO2 core–triple shell Au@SiO2@Ag@SiO2 for ultra-sensitive trinitrotoluene (TNT) detection

Supplementary files

Article information

Article type
Paper
Submitted
30 Aug 2019
Accepted
02 Nov 2019
First published
22 Jan 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 3826-3831

Interfacial effect of dual ultra-thin SiO2 core–triple shell Au@SiO2@Ag@SiO2 for ultra-sensitive trinitrotoluene (TNT) detection

B. Lu, Q. Qi, Y. Wang, H. Chang, J. Zhai and T. You, RSC Adv., 2020, 10, 3826 DOI: 10.1039/C9RA06902J

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