Characterization of SERS–fluorescence bimodal nanocomposites from Au-decorated CaTiO3:Eu3

• Published in: Journal of the Korean Physical Society 2024, 85(10), , pp.838-844
• Main Authors: Kim, Da Young, Jung, Gyeong Bok
• Format: Article
• Language: English
• Subjects: Biomedical materials; Doping; Emission spectra; Europium; Fluorescence; Gold; Mathematical and Computational Physics; Medical imaging; Nanocomposites; Original Paper - Condensed Matter; Orthorhombic phase; Particle and Nuclear Physics; Photoluminescence; Physics; Physics and Astronomy; Raman spectra; Theoretical; X-ray diffraction; 물리학
• ISSN: 0374-4884; 1976-8524
• DOI: 10.1007/s40042-024-01181-w

Surface-enhanced Raman scattering (SERS)–fluorescence bimodal composites have attracted great interest for biomedical applications. Herein, we report the characterization of Au-decorated CaTiO 3 :Eu 3+ nanocomposites (CaTiO 3 :Eu 3+ @Au NCs) using SERS and fluorescence properties. X-ray diffraction (XRD) of the CaTiO 3 :Eu 3+ @Au NCs shows orthorhombic phases, which are in good agreement with the standard CaTiO 3 XRD peaks. The photoluminescence (PL) spectra show a strong visible red emission at 614 nm ( 5 D 0  →  7 F 2 ) with an excitation wavelength of 380 nm. The PL-emission intensity of the CaTiO 3 :Eu 3+ @Au NCs increased more than that of the CaTiO 3 :Eu 3+ powder. The maximum PL-emission intensity of the CaTiO 3 :Eu 3+ @Au NCs was obtained at an Au doping concentration of 0.8 mol/L; however, the intensity at higher Au doping concentrations (> 0.8 mol/L) was lower. This behavior is consistent with the SERS results. These results suggest that varying the Au nanoparticle concentration can control the PL-emission intensity and SERS of the CaTiO3:Eu 3+ @Au NCs. Therefore, CaTiO 3 :Eu 3+ @Au NCs may be useful for multiplex detection and bioimaging.