Bimetallic Multi-core Nanoparticles with Dual SiO2 Layer Au@SiO2@Ag@SiO2 for the Detection of Glucose†

doi:10.7503/cjcu20180722

Abstract

Abstract:

Surface-enhanced Raman scattering(SERS) was demonstrated as a highly efficient approach for the amplification of extremely low signals due to the strong electromagnetic field enhancement that occurs near closely-packed metallic nanostructures, which was dependent on the unique localized surface plasmon resonance(LSPR). To develop sensitive SERS probes, different geometric configurations as approaches are focusing on the synthesis of advanced nanostructures, or efficient Raman label compounds that are resonant with excitation light. These geometric factors affect the polarization direction and magnitude of plasmonic coupling and the SERS signal intensity. As we know, plasmonic properties of Au and Ag NPs are highly sensitive to their shapes. In order to improve the performance of metal nanoparticles in SERS detection, we prepared a highly sensitive and stable bimetallic double silicon core-shell nanostructured material of Au@SiO₂@Ag@SiO₂. The nanoparticles have good Raman scattering properties and excellent stability, since the silicon layer between the bimetals promotes remote plasma excitation transfer. The main component of human urine can be directly detected by using this SERS active material, and the material exhibits the ability to detect highly effectiveness 10^-6 mol/L glucose with label-free Au@SiO₂@Ag@SiO₂ nanoparticles. In addition, simultaneous detection of medium concentrations of 10^-3 mol/L glucose and urea molecules in artificial urine and detection of 10^-3 mol/L glucose in actual urine were also achieved. The Au@SiO₂@Ag@SiO₂ nanoparticles show the potential for detection glucose in the presence of multiple biomolecules.

Key words: Au@SiO₂@Ag@SiO₂, Surface-enhanced Raman scattering, Label-free, Detection of glucose, Urine

CLC Number:

O657

TrendMD:

QI Qi,LU Bingxin,CHE Yuping,WANG Yang,ZHAI Jin. Bimetallic Multi-core Nanoparticles with Dual SiO₂ Layer Au@SiO₂@Ag@SiO₂ for the Detection of Glucose^†[J]. Chem. J. Chinese Universities, 2019, 40(5): 887.

Figures/Tables 9

Fig.1 TEM images of Au@SiO2(A), Ag@SiO2(B) and Au@SiO2@Ag@SiO2(C, D)

Fig.2 HAADF-STEM images of Au@SiO2@Ag@SiO2(A, B), EDX mapping of O(C), Si(D), Ag(E) and Au(F)

Fig.3 SERS spectra of 10-6 mol/L crystal violet on Au@SiO2@Ag@SiO2, Ag@SiO2, Au@SiO2 and Au@SiO2@Ag nanoparticles(A) and average intensity at 808, 918, 1178, 1375 and 1621 cm-1(B)

Fig.4 Time course of intensity of 1178(a) and 1375 cm-1(b) peakInset: SERS spectra of 10-6 mol/L CV on Au@SiO2@Ag@SiO2 at 21 d.

Fig.5 Spectra of CV with 10-7 mol/L(a) and 10-8 mol/L(b) on Au@SiO2@Ag@SiO2 NPs

Fig.6 SERS(a) and regular Raman(b) spectra of urine sample

Fig.7 SERS spectra of glucose in artificial urine on Au@SiO2@Ag@SiO2 with various concentrations of glucose(A) and the nonlinear variation between SERS intensity and area vs. logarithmic plot of glucose concentration for the band at 1147 cm-1(B)(A) c(glucose)/(mol·L-1): a. 10-6; b. 10-5; c. 10-4; d. 10-3; e. 10-2.

Fig.8 Raman spectra of 10-3 mol/L(a) and 10-2 mol/L(b) urea and glucose

Fig.9 Raman spectra of real urine and glucosec(Glucose)/(mol·L-1): a. 10-3; b. 10-2; c. 10-1.

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Bimetallic Multi-core Nanoparticles with Dual SiO₂ Layer Au@SiO₂@Ag@SiO₂ for the Detection of Glucose^†

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