Raman and Luminescent Spectra of Sulfonated Zn Phthalocyanine Enhanced by Gold Nanoparticles

Abstract

Sulfonated Zn phthalocyanine, as a prospective photosensitizer in the photodynamic therapy of tumors, is investigated by means of Raman, infrared, and fluorescence spectroscopies. Conventional and surface-enhanced spectra from this photosensitizer are obtained and compared. Gold nano-islands attached to silica cores (Au-SiO2) are proposed as nanostructures providing plasmonically enhanced signals. Pronounced enhancement of Raman and infrared spectral bands from sulfonated Zn phthalocyanine allows their more convenient assignment with vibrational modes of sulfonated Zn phthalocyanine. In comparison to Raman and IR, the fluorescence is less enhanced by Au-SiO2 particles.

Enrichment of Phosphopeptides Based on Zirconium Phthalocyanine-Modified Magnetic Nanoparticles

“…The vibrations on the phenyl ring occurred at 970 cm –1 , while the vibrations of C–C appeared at 1181 cm –1 . These results suggested the successful synthesis of Zr-Pc …”

“…These results suggested the successful synthesis of Zr-Pc. 27 The XPS spectrum of Zr-Pc is displayed in Figure S1C. There were Zr 3d (179.6 eV), C 1s (282.6 eV), N 1s (397.0 eV), and O 1s (528.2 eV) peaks in the curve of Zr-Pc.…”

Direct Assembly and Metal-Ion Binding Properties of Oxytocin Monolayer on Gold Surfaces

“…SERS analysis was conducted on the Au–OT surface to characterize and identify the OT surface anchoring and ion binding (Figure ). A peak at 285 cm –1 was assigned to S–Au bond. , This peak is significantly higher for Au–OT surfaces compared to bare Au SERS surface washed with AAB (Figure , black curve). The presence of the characteristic gold–sulfur bond energy by SERS and the absence of the disulfide bond-related energy at 420–520 cm –1 (observed by attenuated total reflection (ATR)-FTIR of OT; see Figure S1) confirm chemisorption to gold by oxidative addition.…”