title: Removing polyvinylpyrrolidone from catalytic Pt nanoparticles without modification of superficial order.
abstract: Herein, we report a simple methodology for cleaning Pt nanoparticles, prepared by a colloidal synthesis and coated with polyvinylpyrrolidone, without loss of crystalline surface structure. To prove the removal of the polyvinylpirrolidone from a Pt surface without disturbing the superficial order, a cleaning method using a solution of H(2)O(2)/H(2)SO(4) was tested successfully for a Pt(111) single-crystal electrode. The decontamination method was then tested for two different types of nanoparticles by mixing the suspension of nanoparticles with H(2)O(2)/H(2)SO(4) and subsequent centrifugation. The resulting voltammetric profiles of platinum particles synthesized by the colloidal method employing PVP show a marked presence of the adsorption-state characteristic of (111) ordered surface domains. The presence of the well-ordered domains present on the surface of the nanoparticles was confirmed by using the irreversible adsorption of bismuth, tellurium and germanium.
authors.affiliation: Leiden Institute of Chemistry, Leiden University, Leiden, The Netherlands.
authors.forename: J
authors.initials: J
authors.lastname: Monzó
authors.forename: M T M
authors.initials: MT
authors.lastname: Koper
authors.forename: P
authors.initials: P
authors.lastname: Rodriguez
mesh_terms: D002384:Catalysis; D003460:Crystallization; D055664:Electrochemical Techniques; D004566:Electrodes; D006861:Hydrogen Peroxide / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010984:Platinum / Q000737:chemistry*; D011205:Povidone / Q000302:isolation & purification*; D013499:Surface Properties
chemical_list: D010984:Platinum; D006861:Hydrogen Peroxide; D011205:Povidone