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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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. |
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ISSN: | 1463-9076 1463-9084 |
DOI: | 10.1039/c4cp05170j |