Fig. 3
From: Water and seawater splitting with MgB2 plasmonic metal-based photocatalyst
FTIR and Raman spectroscopic results. (a) The FTIR spectra in the middle IR region taken from MgB2 nanostructure surface in the areas without and with bubbles after water splitting of 0.5 M NaCl electrolyte. Insets (a): Optical images of forming bubbles on the MgB2 nanosheets taken by the standard 15x IR (NA=0.4) Schwarzschild objective before/after measuring the FTIR spectra. Bubble works as an additional focusing lens. (b) FTIR measurements on plasmonic MgB2 photo-anode surface before and after water/seawater splitting experiments performed under Vbias=0.3 V. (c) In situ FTIR spectra of interaction plasmonic MgB2 photo-anode with 0.5 M NaCl electrolyte under application of different bias voltage Vbias=0¸0.4 V. (d, e) Surface enhanced Raman signals from R6G dye molecules placed on top of MgB2 nanosheet assemblies due to LSPRs of metallic MgB2 nanostructures providing highly enhanced electromagnetic fields: (d) excitation with λ = 514.5 nm and (e) excitation with λ = 632.8 nm.
