Surface enhanced vibrational spectroscopy and first-principles study of l-cysteine adsorption on noble trimetallic Au/Pt@Rh clustersElectronic supplementary information (ESI) available. See DOI: 10.1039/c4cp05170j

The Rh shell of the Au/Pt/Rh trimetallic nanoparticles induces a wide variety of interesting surface reactions by allowing the adsorption of amino acids like l -cysteine ( l -Cys). We present a snapshot of theoretical and experimental investigation of l -Cys adsorption on the surface of noble trimet...

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Hauptverfasser: Loganathan, B, Chandraboss, V. L, Senthilvelan, S, Karthikeyan, B
Format: Artikel
Sprache:eng
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Zusammenfassung:The Rh shell of the Au/Pt/Rh trimetallic nanoparticles induces a wide variety of interesting surface reactions by allowing the adsorption of amino acids like l -cysteine ( l -Cys). We present a snapshot of theoretical and experimental investigation of l -Cys adsorption on the surface of noble trimetallic Au/Pt@Rh colloidal nanocomposites. Density functional theoretical (DFT) investigations of l -Cys interaction with the Rhodium (Rh) shell of a trimetallic Au/Pt@Rh cluster in terms of geometry, binding energy ( E B ), binding site, energy gap ( E g ), electronic and spectral properties have been performed. l -Cys establishes a strong interaction with the Rh shell. It binds to Rh by the S 1 -site, which makes a stable l -Cys-Rh surface complex. DFT can be taken as a valuable tool to assign the vibrational spectra of the adsorption of l -Cys on trimetallic Au/Pt@Rh colloidal nanocomposites and mono-metallic Rh nanoparticles. Surface-enhanced infrared spectroscopy (SEIRS) with l -Cys on a Rh 6 cluster surface has been simulated for the first time. Experimental information on the l -Cys-Rh surface complex is included to examine the interaction. The experimental spectral observations are in good agreement with the simulated DFT results. Characterization of the synthesized trimetallic Au/Pt@Rh colloidal nanocomposites has been done by high-resolution transmission electron microscopy (HR-TEM) with selected area electron diffraction (SAED) pattern, energy dispersive X-ray (EDX) spectroscopy, dynamic light scattering (DLS) measurements, zeta potential, zeta deviation analysis and UV-visible (UV-Vis) spectroscopic studies. First-principles study of l -cysteine adsorption on noble trimetallic Au/Pt@Rh clusters has been discussed in the light of SEIRS and theoretical surface complex calculation.
ISSN:1463-9076
1463-9084
DOI:10.1039/c4cp05170j