This work aims to fabricate the raspberry-like nanostructures (SiO2@AgNPS) by electrical exploding wire (EEW) technique with high active surface area, and studies the effect of SiO2@AgNPS on the absorption spectra and surface-enhanced Raman scattering (SERS) activities using Rhodamine 6G dye as probe molecules. The number of AgNPs that decorated the SiO2 surface has been controlled by the number of explosions. The structural properties of the raspberry-like nanostructures (SiO2@AgNPs) have been examined using X-Ray diffraction (XRD) for a different number of explosions. Element analysis and surface morphology have been examined using field emission scanning electron microscopy (FESEM). The absorption spectra of the mixed R6G laser dye (concentration 1x10−6 M) with the raspberry-like nanostructures (SiO2@AgNPS) have been examined by double beam UV-Vis Spectrophotometer. Raman spectra of the R6G mixed with the raspberry-like nanostructures (SiO2@AgNPs) with different number of explosions have been examined using a Horiba HR Evolution 800 Raman microscope system and objective lens was (50 x). All samples have shown satisfactory SERS activity increasing with the number of explosions (increasing of hot spots). The SERS enhancement factor of R6G dye (1x10-6 M) mixed with the raspberry-like nanostructures (SiO2@AgNPS) has reached to (8.8 x 106) at the wave number (1366 cm-1) after being excited by (λexc. = 532nm) laser source. The raspberry-like SiO2@AgNPs nanostructures have exhibited ultra-high sensitivity of SERS signals of Rhodamine 6G (R6G) dye molecules, where a low limit of detection has reached down to 1x10-12M. The raspberry-like SiO2@AgNPs nanostructures have exhibited a superb reproducibility and excellent stability as a SERS substrate to realize the trace detection. EEW technique has not involved using of dangerous chemicals and pollutant organic solvents through the fabrication process. These results suggest that the raspberry-like nanostructures (SiO2@AgNPs) have an advantage in ultra-sensitive devices and molecular detection through surface enhanced Raman scattering (SERS) applications in biological and chemical fields.
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4 December 2020
THE 8TH INTERNATIONAL CONFERENCE ON APPLIED SCIENCE AND TECHNOLOGY (ICAST 2020)
15–16 April 2020
Karbala, Iraq
Citation
Fouad G. HamzahHammad R. Humud; The Raspberry-like nanostructures (SiO2@AgNPs) fabricated by electrical exploding wire (EEW) technique for Raman scattering enhancement. AIP Conf. Proc. 4 December 2020; 2290 (1): 050033. https://doi.org/10.1063/5.0029719
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