Open AccessFormation and Growth of Pd Nanoparticles Inside a Highly Cross-Linked Polystyrene Support: Role of the Reducing Agent
Author(s) -
Elena Groppo,
Giovanni Agostini,
Elisa Borfecchia,
Liu Wei,
Francesco Giannici,
Giuseppe Portale,
Alessandro Longo,
Carlo Lamberti
Publication year - 2014
Publication title -
the journal of physical chemistry c
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.401
H-Index - 289
eISSN - 1932-7455
pISSN - 1932-7447
DOI - 10.1021/jp5003897
Subject(s) - nanoparticle , polystyrene , small angle x ray scattering , materials science , palladium , reducing agent , chemical engineering , porosity , diffuse reflectance infrared fourier transform , xanes , in situ , x ray photoelectron spectroscopy , spectroscopy , nanotechnology , chemistry , catalysis , scattering , polymer , organic chemistry , photocatalysis , physics , engineering , quantum mechanics , optics , composite material
Simultaneous time-resolved SAXS and XANES techniques were employed to follow in situ the formation of Pd nanoparticles in a porous polystyrene support, using palladium acetate as precursor and gaseous H2 or CO as reducing agents. These results, in conjunction with data obtained by DR UV-Vis and DRIFT spectroscopy and TEM measurements, allowed to unravel the different role played by gaseous H2 and CO in the formation of the Pd nanoparticles. In particular, it was found that the reducing agent affects: i) the reduction rate (which is faster in presence of CO); ii) the properties of the hosted nanoparticles, in terms of size (bigger with CO), morphology (spherical with H2, triangular-like with CO) and surface properties (unclean with CO). The importance of a multi-technique approach in following the whole process of metal nanoparticles formation clearly emerges
Accelerating Research
Robert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom
Address
John Eccles HouseRobert Robinson Avenue,
Oxford Science Park, Oxford
OX4 4GP, United Kingdom