Abstract
Dispersed Pd nanoparticles (Pdπ) have been synthesized by reducing H2PdCl4 with ethanol, and stabilized using poly(vinylpyrrolidone) (PVP). The Pdπ is applied to the glassy carbon substrate to form a thin film, and then the potential cyclic scanning at 50 mV-s−1 from -0.25 to 1.25 V was carried out for about 30 min to form the aggregations of Pdπ (Pdagπ). FTIR spectroscopy of both transmission and reflection modes was employed to study CO adsorption on Pdπ and Pdagπ in both solid|liquid and solid|gas interfaces. It has been revealed that CO adsorption on Pdπ film yields two IR bands near 1964 and 1906 cm−1, which are assigned to IR absorption of CO bonded on asymmetric and symmetric bridge sites, respectively. In contrast to the IR properties of CO adsorbed on Pdπ, only species of CO bonded on asymmetric bridge sites was determined on Pdagπ, and the direction of the IR band near 1963 cm−1 is completely inverted. The full width at half-maximum (FWHM) of the COasinB band near 1964 cm−1 is measured to be 14 cm−1 on Pdπ film, while it is 24 cm−1 on Pdagπ film. The results of the present study demonstrated that the inverting of the IR band direction is a general phenomenon that is closely related to the interaction between nanoparticles in aggregation of Pdπ.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
