SEIRA studies of uracil adsorbed on wet-chemically prepared gold nanoparticles film on glass substrate – Effect of morphology of film

• SEIRA of uracil on AuNp film/glass slide using ATR geometry.
• The deposition time of AuNp on glass slides varied to see its impact on SEIRA.
• The small shift in SEIRA spectra indicates weak interaction of molecules with AuNp.

Surface-enhanced infrared absorption (SEIRA) studies of uracil adsorbed on wet-chemically prepared gold nanoparticles (AuNp) immobilized on silanised glass substrate were carried out using attenuated total reflectance–Fourier transform infrared (ATR–FTIR) spectroscopy. The deposition time dependent evolution of morphological changes in AuNp films and its influence on the SEIRA spectra of uracil were investigated. The morphological changes were examined by atomic force microscopy (AFM). The spectrum of uracil adsorbed on AuNp film obtained with ½ an hour deposition time showed a clear enhancement than 2 and 4 h deposition times. The small shift seen in SEIRA spectra indicates weak interaction of the molecules with AuNp film.

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