Surface-enhanced Raman scattering and SERRS imaging of phthalocyanine mixed films

Abstract

<jats:p> The objective of the present work is the study of the surface-enhanced spectroscopy of mixed thin solid films of metallophthalocyanine ( MPc ; M ≡ Cu , Co ) and bis(n-propylimido)perylene ( Bis - PTCDPr ) materials fabricated by vacuum co-evaporation onto silver island films. The surface-enhanced Raman scattering (SERS) and surface-enhanced resonance Raman scattering (SERRS) of neat Bis - PTCDPr , CuPc and CoPc were also recorded using visible 514.5 and 633 nm laser lines and near-infrared excitation at 780 nm. During the investigation it was found that the Raman scattering (RS) and resonance Raman scattering (RRS) spectra of CuPc and CoPc films were sensitive to the irradiance at the sample. To further explore the effect of local heating on the vibrational spectrum, a temperature dependence (between −180 and 200 °C) study was carried out using the 514.5 nm laser line with constant laser power. The overtones and combinations of the CuPc and CoPc molecules were also clearly observed in the RRS and SERRS spectra. The study of the SER(R)S spectra allowed us to conclude that the dyes of the mixed films were physically adsorbed onto the silver islands. It is also shown that, in mixed films, differences in the absorption properties can be used to tune into the spectrum of any one of the components of the mixture with the appropriate laser line. For the first time, SERRS mapping and global imaging of mixed films obtained with the 514.5 nm laser line are reported. Complementary information about the quality of the films, homogeneity and phase separation may be obtained using SERRS imaging. </jats:p>

Nanoantenna-assisted plasmonic enhancement of IR absorption of vibrational modes of organic molecules

“…2. The mode frequencies observed at 683, 750, 958, 1307, 1340, and 1465 cm −1 are in accordance with the literature data [23]. …”

“…The Raman spectra of the CoPc films deposited on a Si substrate (Fig. 2) reveal a rich spectrum of CoPc vibrational modes similar to that observed previously [23]. Note that the excitation energy was 1.96 eV (632.8 nm), which matches well with the HOMO–LUMO gap energy of CoPc (1.9 eV).…”

“…In addition to the most intense mode of the Si substrate (observed at 520.5 cm −1 ), the RRS spectrum (Fig. 2) is dominated by the vibrational mode at 1543 cm −1 assigned to the C=N stretching mode [23]. The chemical structure of CoPc is shown in the inset of Fig.…”

The Scavenging Effect of Myoglobin from Meat Extracts toward Peroxynitrite Studied with a Flow Injection System Based on Electrochemical Reduction over a Screen-Printed Carbon Electrode Modified with Cobalt Phthalocyanine: Quantification and Kinetics

“…In the Raman spectrum of CoPc (Figure 2d), there are active modes of the symmetry A1g at 592 cm −1 (benzene radial), 834 cm −1 , B1g at 684 cm −1 (macro breathing and benzene radial), 1542 cm −1 (C=N stretching mode), and B2g at 1498 cm −1 (pyrrole stretch) [39,40]. The HUMO-LUMO gap energy of CoPc is 1.9 eV.…”