Tuning Ordered Pattern of Pd Species through Controlled Block Copolymer Self-Assembly.
We report a method for the preparation of ordered patterns of Pd species on a substrate based on the use of polystyrene-block-poly(ethylene oxide) copolymer (PS-b-PEO) templates and selective inclusion of palladium (Pd) species in the PEO domains. PS-b-PEO samples of different total molecular masses self-assemble in a cylindrical microphase-separated morphology, in which vertically aligned PEO cylinders, with different diameters depending on the molecular mass, are organized in a hexagonal array of different lateral spacings. The cylindrical nanostructure is maintained after the selective inclusion of Pd species (Pd acetate and Pd nanoparticles (NPs) after reduction of Pd ions of the salt) in the PEO cylinders so that the characteristic sizes (diameters and lateral spacings) of the included Pd species are tuned by the characteristic sizes of the block copolymer (BCP) template, which are regulated by molecular mass. Treatment of nanocomposites at elevated temperatures in air removes the polymer matrix and leads to the formation of arrays of palladium oxide (PdO) NPs covering a solid support. The patterns of PdO NPs are characterized by different particle diameters and gap distances, mirroring the patterns and characteristic nanodimensions of the parent BCPs used as templates.
Dipartimento di Scienze Chimiche, Università di Napoli Federico II , Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy.
Claudio
C
De Rosa
Dipartimento di Scienze Chimiche, Università di Napoli Federico II , Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy.
Finizia
F
Auriemma
Dipartimento di Scienze Chimiche, Università di Napoli Federico II , Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy.
Anna
A
Malafronte
Dipartimento di Scienze Chimiche, Università di Napoli Federico II , Complesso Monte S. Angelo, Via Cintia, 80126 Napoli, Italy.
Rocco
R
Di Girolamo
Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Universidade de Santiago de Compostela , Campus Vida, C/ Jenaro de la Fuente, 15782 Santiago de Compostela, Spain.
Massimo
M
Lazzari
Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Universidade de Santiago de Compostela , Campus Vida, C/ Jenaro de la Fuente, 15782 Santiago de Compostela, Spain.
Marina
M
Nieto-Suárez
European Synchrotron Radiation Facility (ESRF) , 6 rue Jules Horowitz, BP 220, 38043 Grenoble Cedex 9, France.
Daniel
D
Hermida-Merino
School of Chemistry, Pharmacy and Food Biosciences, University of Reading , Whiteknights, Reading RG6 6AD, U.K.
Ian William
IW
Hamley
Macromolecular Chemistry & New Polymeric Materials, Zernike Institute for Advanced Materials , Nijenborgh 4, 9747 AG Groningen, The Netherlands.
Giuseppe
G
Portale